Contacts of the helix formed by residues 283 - 314 (chain A) in PDB entry 4LML


Residue contacts within the protein are derived with the CSU software (Sobolev V., Sorokine A., Prilusky J., Abola E.E. and Edelman M. (1999) Automated analysis of interatomic contacts in proteins. Bioinformatics, 15, 327-332). A short description of the analytical approach is given at the end of the page.
For CSU analysis of other PDB entry

Note:
Non-standard 3 letter residue codes indicate a heterogroup. To identify and analyse, use LPC software

Legend:
Dist - nearest distance (Å) between atoms of two residues
Surf - contact surface area (Å2) between two residues
HB   - hydrophilic-hydrophilic contact (hydrogen bond)
Arom - aromatic-aromatic contact
Phob - hydrophobic-hydrophobic contact
DC   - hydrophobic-hydrophilic contact (destabilizing contact)
+/-  - indicates presence/absence of a specific contacts
*    - indicates residues forming contacts  by their side chain
       (including CA atoms)
Residues in contact with GLN 283 (chain A).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    278A  LEU*     3.5    31.5    +      -       +      +
    279A  LYS      4.8     0.4    +      -       -      -
    281A  GLU*     3.4     7.2    -      -       +      +
    282A  SER*     1.3    78.3    -      -       -      +
    284A  PRO*     1.4    61.1    -      -       -      +
    285A  ALA*     3.1    13.3    +      -       +      +
    286A  ARG*     3.3    51.3    +      -       +      +
    287A  ALA*     3.5     8.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with PRO 284 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    279A  LYS*     5.1    15.3    -      -       +      +
    282A  SER*     3.3    11.4    -      -       -      +
    283A  GLN*     1.4    86.1    -      -       -      +
    285A  ALA*     1.3    65.5    +      -       +      +
    286A  ARG      3.3     0.4    -      -       -      -
    287A  ALA*     3.6    12.8    -      -       +      -
    288A  ALA*     2.9    28.3    +      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 285 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    283A  GLN*     3.1     9.4    -      -       +      +
    284A  PRO*     1.3    80.8    -      -       -      +
    286A  ARG*     1.3    59.9    +      -       -      +
    288A  ALA*     4.7     2.1    -      -       -      +
    289A  SER*     3.8    15.6    +      -       -      -
----------------------------------------------------------
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Residues in contact with ARG 286 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    278A  LEU*     3.6    23.2    -      -       +      +
    283A  GLN*     3.3    35.5    +      -       -      +
    285A  ALA*     1.3    78.6    -      -       -      +
    287A  ALA*     1.3    60.5    +      -       -      +
    289A  SER*     3.1     9.4    +      -       -      -
    290A  ILE*     3.0    40.2    +      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 287 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    275A  GLN*     4.7    24.0    -      -       +      +
    278A  LEU*     3.7    14.3    -      -       +      +
    279A  LYS*     4.8    13.5    -      -       +      -
    283A  GLN      3.5     5.2    +      -       -      +
    284A  PRO*     3.2    20.8    +      -       +      +
    286A  ARG*     1.3    80.2    -      -       -      +
    288A  ALA*     1.3    62.1    +      -       -      +
    289A  SER      3.4     0.2    +      -       -      -
    290A  ILE*     3.6     4.8    +      -       -      +
    291A  THR*     3.1    25.8    +      -       -      -
----------------------------------------------------------
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Residues in contact with ALA 288 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    284A  PRO      2.9    14.5    +      -       -      +
    285A  ALA*     4.7     2.7    -      -       -      +
    287A  ALA*     1.3    76.5    -      -       -      +
    289A  SER*     1.3    57.6    +      -       -      +
    291A  THR*     3.8     4.5    +      -       -      -
    292A  ARG*     3.0    32.1    +      -       -      +
    295A  ARG*     5.7     1.2    +      -       -      -
----------------------------------------------------------
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Residues in contact with SER 289 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    285A  ALA      3.8    12.2    +      -       -      -
    286A  ARG*     3.1    14.9    +      -       -      -
    288A  ALA*     1.3    76.4    -      -       -      +
    290A  ILE*     1.3    68.0    +      -       -      +
    292A  ARG*     3.2     6.2    +      -       -      +
    293A  ALA*     2.9    23.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 290 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    271A  GLU*     4.5    20.4    -      -       +      +
    274A  VAL*     4.0    27.8    -      -       +      -
    275A  GLN*     5.8     4.3    -      -       +      +
    278A  LEU*     4.1    19.7    -      -       +      -
    286A  ARG*     3.0    23.6    +      -       +      +
    287A  ALA*     3.9     5.2    -      -       -      +
    289A  SER*     1.3    74.4    -      -       -      +
    291A  THR*     1.3    64.4    +      -       -      +
    293A  ALA*     2.9    18.0    +      -       -      +
    294A  SER*     3.0    16.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with THR 291 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    214A  ALA      4.7     1.6    -      -       -      +
    215A  PHE*     3.0    43.3    -      -       +      +
    217A  SER      4.9     2.5    -      -       -      +
    271A  GLU*     3.6    16.0    +      -       -      +
    275A  GLN*     2.5    31.9    +      -       -      +
    287A  ALA      3.1    16.1    +      -       -      -
    288A  ALA*     4.1     5.1    -      -       -      -
    289A  SER      3.4     0.2    -      -       -      -
    290A  ILE*     1.3    77.7    -      -       -      +
    292A  ARG*     1.3    62.2    +      -       -      +
    294A  SER*     3.2     4.2    +      -       -      -
    295A  ARG*     3.0    30.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 292 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    216A  TRP*     6.2     0.6    -      -       -      -
    288A  ALA      3.0    19.5    +      -       -      +
    289A  SER*     3.2     6.3    +      -       -      +
    291A  THR*     1.3    76.0    -      -       -      +
    293A  ALA*     1.3    61.5    +      -       -      +
    295A  ARG*     3.4    52.6    -      -       -      +
    296A  ILE*     4.0    25.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 293 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    289A  SER      2.9    12.7    +      -       -      +
    290A  ILE*     3.2    11.9    -      -       +      +
    292A  ARG*     1.3    74.2    -      -       -      +
    294A  SER*     1.3    66.4    +      -       -      +
    296A  ILE*     3.1     6.6    +      -       -      +
    297A  ALA*     2.9    25.9    +      -       +      +
----------------------------------------------------------
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Residues in contact with SER 294 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    215A  PHE*     3.4    21.0    -      -       -      -
    271A  GLU*     2.9    38.3    +      -       -      +
    290A  ILE*     3.0    11.0    +      -       -      +
    291A  THR      3.2     6.0    +      -       -      -
    293A  ALA*     1.3    74.9    -      -       -      +
    295A  ARG*     1.3    64.1    +      -       -      +
    296A  ILE      2.9     1.9    +      -       -      -
    297A  ALA*     4.5     3.1    -      -       -      -
    298A  PHE*     3.0    43.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 295 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    215A  PHE*     2.7    37.9    +      -       +      -
    216A  TRP*     3.4    61.7    -      -       +      +
    288A  ALA      5.7     1.2    +      -       -      -
    291A  THR*     3.0    21.7    +      -       -      +
    292A  ARG*     3.4    54.0    -      -       -      +
    293A  ALA      3.2     0.4    -      -       -      -
    294A  SER*     1.3    74.2    -      -       -      +
    296A  ILE*     1.3    62.0    +      -       +      +
    299A  PRO*     3.5    17.9    -      -       -      +
    277C  TYR*     3.8    37.2    +      -       -      -
----------------------------------------------------------
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Residues in contact with ILE 296 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    292A  ARG*     4.2    26.9    -      -       -      +
    293A  ALA*     3.1     6.3    +      -       -      +
    294A  SER      2.9     0.6    +      -       -      -
    295A  ARG*     1.3    84.6    -      -       +      +
    297A  ALA*     1.3    69.0    +      -       -      +
    298A  PHE      3.2     1.6    -      -       -      -
    299A  PRO*     3.1     7.9    -      -       +      +
    300A  VAL*     2.9    41.4    +      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 297 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    293A  ALA*     2.9    20.3    +      -       +      +
    294A  SER*     4.3     3.4    -      -       -      +
    296A  ILE*     1.3    77.7    -      -       -      +
    298A  PHE*     1.3    61.1    +      -       +      +
    300A  VAL*     4.0     8.1    -      -       -      -
    301A  VAL*     2.5    48.6    +      -       +      +
----------------------------------------------------------
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Residues in contact with PHE 298 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    212A  TRP*     3.4    33.8    -      +       +      -
    215A  PHE*     3.3    32.5    -      +       +      -
    264A  PHE*     4.1     7.8    -      +       +      -
    267A  VAL*     3.7    41.3    -      -       +      -
    268A  ALA*     4.0    15.3    -      -       +      -
    271A  GLU*     4.7     4.3    -      -       +      -
    294A  SER*     3.0    37.3    +      -       -      +
    297A  ALA*     1.3    79.8    -      -       +      +
    299A  PRO*     1.4    70.8    -      -       +      +
    301A  VAL*     4.1     5.4    -      -       +      +
    302A  PHE*     3.1    25.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with PRO 299 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    209A  PHE*     6.2     0.9    -      -       +      -
    212A  TRP*     4.2    29.4    -      -       +      +
    215A  PHE*     5.6     0.7    -      -       +      -
    294A  SER      3.8     0.4    -      -       -      +
    295A  ARG*     3.5    21.8    -      -       -      +
    296A  ILE*     3.1    18.2    -      -       +      +
    298A  PHE*     1.4    88.3    -      -       +      +
    300A  VAL*     1.3    56.4    +      -       +      +
    302A  PHE*     3.7     2.3    -      -       +      +
    303A  LEU*     2.9    33.8    +      -       +      +
----------------------------------------------------------
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Residues in contact with VAL 300 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    296A  ILE*     2.9    40.1    +      -       +      +
    297A  ALA*     3.4     6.7    -      -       -      +
    299A  PRO*     1.3    76.5    -      -       +      +
    301A  VAL*     1.3    63.9    +      -       +      +
    303A  LEU*     3.8     3.8    -      -       -      +
    304A  LEU*     2.8    41.7    +      -       +      +
----------------------------------------------------------
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Residues in contact with VAL 301 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    264A  PHE*     3.7    23.8    -      -       +      -
    297A  ALA*     2.5    40.6    +      -       +      +
    298A  PHE*     4.1     5.2    -      -       +      +
    300A  VAL*     1.3    74.7    -      -       +      +
    302A  PHE*     1.3    52.8    +      -       -      +
    304A  LEU*     3.5     6.8    -      -       -      +
    305A  ALA*     2.7    37.6    +      -       +      +
----------------------------------------------------------
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Residues in contact with PHE 302 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    205A  LEU*     4.0    22.0    -      -       +      -
    208A  LEU*     3.4    28.9    -      -       +      -
    209A  PHE*     4.5    11.9    -      +       -      -
    212A  TRP*     3.8    12.6    -      +       +      -
    257A  ILE*     6.4     1.8    -      -       +      -
    260A  MET*     4.2     6.3    -      -       +      -
    261A  ILE*     4.2    18.4    -      -       +      -
    264A  PHE*     3.2    31.3    -      +       +      -
    298A  PHE      3.1    17.3    +      -       -      +
    299A  PRO*     3.7     4.5    -      -       +      +
    301A  VAL*     1.3    79.3    -      -       -      +
    303A  LEU*     1.3    64.4    +      -       +      +
    304A  LEU      3.0     0.3    +      -       -      -
    305A  ALA*     3.1     2.8    +      -       -      +
    306A  ASN*     2.8    61.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 303 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    299A  PRO*     2.9    23.3    +      -       +      +
    300A  VAL*     4.1     3.4    -      -       -      +
    302A  PHE*     1.3    80.9    -      -       +      +
    304A  LEU*     1.3    60.1    +      -       +      +
    306A  ASN*     4.1     4.8    -      -       -      +
    307A  ILE*     3.1    49.6    +      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 304 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    300A  VAL*     2.8    27.1    +      -       +      +
    301A  VAL*     3.5     6.3    -      -       -      +
    303A  LEU*     1.3    76.5    -      -       +      +
    305A  ALA*     1.3    67.9    +      -       -      +
    306A  ASN      3.1     1.1    -      -       -      -
    307A  ILE*     2.9    25.1    +      -       +      +
    308A  ILE*     2.9    31.5    +      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 305 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    260A  MET*     3.8    29.4    -      -       +      +
    264A  PHE*     5.0     0.4    -      -       +      -
    301A  VAL*     2.7    27.3    +      -       +      +
    302A  PHE      3.7     2.9    -      -       -      +
    304A  LEU*     1.3    72.9    -      -       -      +
    306A  ASN*     1.3    56.8    +      -       -      +
    308A  ILE*     3.4    11.1    -      -       -      +
    309A  LEU*     3.0    30.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASN 306 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    205A  LEU*     6.2     0.4    -      -       -      +
    253A  TYR*     4.9     9.0    +      -       -      -
    257A  ILE*     4.7    24.1    -      -       -      +
    260A  MET*     3.5    13.3    -      -       -      +
    302A  PHE*     2.8    53.8    +      -       +      +
    303A  LEU*     4.1     6.3    -      -       -      +
    305A  ALA*     1.3    75.2    -      -       -      +
    307A  ILE*     1.3    61.5    +      -       +      +
    309A  LEU*     3.3     5.8    +      -       -      +
    310A  ALA*     2.9    31.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 307 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    303A  LEU*     3.1    37.4    +      -       +      +
    304A  LEU*     2.9    19.8    +      -       +      +
    306A  ASN*     1.3    74.8    -      -       +      +
    308A  ILE*     1.3    70.1    +      -       +      +
    310A  ALA*     3.5     6.6    +      -       -      +
    311A  PHE*     3.4    20.5    +      -       +      +
----------------------------------------------------------
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Residues in contact with ILE 308 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    304A  LEU*     2.9    33.1    +      -       +      +
    305A  ALA*     3.4    11.4    -      -       -      +
    307A  ILE*     1.3    83.8    -      -       +      +
    309A  LEU*     1.3    65.7    +      -       +      +
    311A  PHE*     3.8     5.2    +      -       -      +
    312A  LEU*     3.4    29.8    +      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 309 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    253A  TYR*     4.4     7.0    -      -       +      -
    256A  ALA*     4.4    10.1    -      -       +      -
    257A  ILE*     3.7    35.4    -      -       +      +
    260A  MET*     3.8    22.7    -      -       +      -
    305A  ALA      3.0    15.9    +      -       -      +
    306A  ASN*     3.3     6.5    +      -       -      +
    308A  ILE*     1.3    77.0    -      -       +      +
    310A  ALA*     1.3    66.7    +      -       -      +
    312A  LEU*     3.3    20.9    +      -       +      +
    313A  PHE*     3.4    38.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 310 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    253A  TYR*     4.2    20.1    -      -       -      +
    306A  ASN      2.9    17.7    +      -       -      +
    307A  ILE*     3.7     8.3    -      -       -      +
    308A  ILE      3.4     0.2    -      -       -      -
    309A  LEU*     1.3    77.5    -      -       -      +
    311A  PHE*     1.3    61.6    +      -       -      +
    313A  PHE      3.5     0.2    +      -       -      -
    314A  PHE*     3.2    32.0    +      -       +      +
----------------------------------------------------------
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Residues in contact with PHE 311 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    307A  ILE*     3.4    13.4    +      -       +      +
    308A  ILE*     4.2     4.0    -      -       -      +
    310A  ALA*     1.3    74.3    -      -       -      +
    312A  LEU*     1.3    71.0    +      -       +      +
    313A  PHE      2.8    11.4    +      -       -      -
    315A  GLY*     3.0    50.1    +      -       -      +
    316A  PHE*     3.3    31.8    +      +       +      -
----------------------------------------------------------
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Residues in contact with LEU 312 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    308A  ILE*     3.4    22.6    +      -       +      +
    309A  LEU*     3.3    17.3    +      -       +      +
    311A  PHE*     1.3    89.4    -      -       +      +
    313A  PHE*     1.3    65.8    +      -       +      +
    316A  PHE*     3.9    33.2    -      -       +      +
----------------------------------------------------------
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Residues in contact with PHE 313 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    116A  ARG*     4.0    32.3    -      -       +      -
    117A  ARG*     4.4    15.1    +      -       +      +
    251A  MET*     4.0    19.5    -      -       +      -
    252A  THR      4.0     6.1    -      -       -      -
    253A  TYR*     3.5    38.8    -      +       +      -
    256A  ALA*     4.9     4.0    -      -       +      -
    309A  LEU*     3.4    36.1    +      -       +      +
    310A  ALA      3.5     0.4    +      -       -      -
    311A  PHE      2.8     1.4    +      -       -      -
    312A  LEU*     1.3    87.1    -      -       +      +
    314A  PHE*     1.3    81.4    +      -       +      +
    316A  PHE*     3.7    12.2    -      -       -      +
----------------------------------------------------------
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Residues in contact with PHE 314 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    117A  ARG*     3.9    52.3    +      -       +      +
    120A  PHE*     4.0    40.2    -      +       +      -
    253A  TYR*     4.3    27.4    -      +       +      -
    310A  ALA*     3.2    18.9    +      -       +      +
    311A  PHE*     5.5     0.2    -      -       -      -
    313A  PHE*     1.3    93.8    -      -       +      +
    315A  GLY*     1.3    59.8    +      -       -      +
    316A  PHE*     3.2     8.1    +      -       -      +
----------------------------------------------------------
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A short description of the analytical approach
The contact analysis used in this page is based upon the approach developed in: Sobolev V., Wade R.C., Vriend G. and Edelman M. PROTEINS (1996) 25, 120-129. Contact legitimacy depends on the hydrophobic-hydrophilic properties of the contacting atoms. In order to define it, for each inter-atomic contact, eight atom classes have been introduced:


   I  Hydrophilic      - N and O that can donate and accept hydrogen bonds
                         (e.g., oxygen of hydroxyl group of Ser. or Thr)
  II  Acceptor         - N or O that can only accept a hydrogen bond
 III  Donor            - N that can only donate a hydrogen bond
  IV  Hydrophobic      - Cl, Br, I and all C atoms that are not in
                         aromatic rings and do not have a covalent bond to
                         a N or O atom
   V  Aromatic         - C in aromatic rings irrespective of any other 
                         bonds formed by the atom
  VI  Neutral          - C atoms that have a covalent bond to at least one
                         atom of class I or two or more atoms from class II
                         or III; atoms; S, F, P, and metal atoms in all cases
 VII  Neutral-donor    - C atoms that have a covalent bond with only one
                         atom of class III
VIII  Neutral-acceptor - C atoms that have a covalent bond with only 
                         one atom of class II
For each pair of contacts the state of legitimacy is shown below:

Legend:
+, legitimate
-, illegitimate
------------------------------------------------------------
  Atomic class           I  II  III   IV   V   VI  VII  VIII
------------------------------------------------------------
   I  (Hydrophilic)      +   +    +    -   +   +    +    +
  II  (Acceptor)         +   -    +    -   +   +    +    -
 III  (Donor)            +   +    -    -   +   +    -    +
  IV  (Hydrophobic)      -   -    -    +   +   +    +    +
   V  (Aromatic)         +   +    +    +   +   +    +    +
  VI  (Neutral)          +   +    +    +   +   +    +    +
 VII  (Neutral-donor)    +   +    -    +   +   +    -    +
VIII  (Neutral-acceptor) +   -    +    +   +   +    +    -
------------------------------------------------------------
Warning!
Atom classes for heterogroups are automatically assigned based on the atomic coordinates. However, in three cases (see below) the automatic assignment is currently ambiguous. In these cases, the user is advised to manually analyse the full list of contacts using LPC software.
1. Carbon atoms belonging to a 4-, 5- or 6-member ring are 
   considered "aromatic" (Class V) if the ring is approximately
   planar, and "hydrophobic" (Class IV) or "neutral" (Classes
   VI, VII, VIII) if the ring is non-planar.
2. The oxygen atom of a carbonyl or hydroxy group is considered
   "hydroxy" (Class I) if the CO bond is longer than 1.29 Å, and
   "carbonyl" (Class II) if shorter.
3. All nitrogen atoms are considered "hydrophilic" (Class I).

Please E-mail any questions and/or suggestions concerning this page to Vladimir.Sobolev@weizmann.ac.il