Contacts of the helix formed by residues 283 - 314 (chain B) 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 B).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    278B  LEU*     3.4    29.6    +      -       +      +
    279B  LYS*     4.5     0.8    +      -       -      -
    281B  GLU*     3.3    10.4    -      -       +      +
    282B  SER*     1.3    78.0    -      -       -      +
    284B  PRO*     1.4    62.1    -      -       -      +
    285B  ALA*     3.0    12.3    -      -       +      +
    286B  ARG*     3.1    60.1    +      -       +      +
    287B  ALA*     3.1    10.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with PRO 284 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    279B  LYS*     5.1    14.6    -      -       +      +
    282B  SER*     3.3    11.4    -      -       -      +
    283B  GLN*     1.4    86.0    -      -       -      +
    285B  ALA*     1.3    65.4    +      -       +      +
    286B  ARG      3.2     0.2    -      -       -      -
    287B  ALA*     3.5    12.6    -      -       +      -
    288B  ALA*     2.9    28.3    +      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 285 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    283B  GLN*     3.0     9.6    -      -       +      +
    284B  PRO*     1.3    81.9    -      -       +      +
    286B  ARG*     1.3    60.4    +      -       -      +
    288B  ALA*     4.9     1.2    -      -       -      +
    289B  SER*     3.5    18.2    +      -       -      -
----------------------------------------------------------
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Residues in contact with ARG 286 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    278B  LEU*     3.4    26.4    -      -       +      +
    283B  GLN*     3.1    40.0    +      -       -      +
    285B  ALA*     1.3    79.0    -      -       -      +
    287B  ALA*     1.3    60.2    +      -       -      +
    289B  SER*     3.1     7.4    +      -       -      -
    290B  ILE*     3.0    46.1    +      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 287 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    275B  GLN*     4.1    17.5    -      -       +      +
    278B  LEU*     3.6    13.9    -      -       +      +
    279B  LYS*     4.3    26.7    -      -       +      -
    283B  GLN      3.1     7.3    +      -       -      +
    284B  PRO*     3.2    20.6    +      -       +      -
    286B  ARG*     1.3    78.0    -      -       -      +
    288B  ALA*     1.3    63.0    +      -       -      +
    289B  SER      3.4     0.2    +      -       -      -
    290B  ILE*     3.8     2.6    +      -       -      +
    291B  THR*     3.2    24.1    +      -       -      -
----------------------------------------------------------
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Residues in contact with ALA 288 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    284B  PRO*     2.9    16.3    +      -       +      +
    285B  ALA      4.9     1.3    -      -       -      +
    287B  ALA*     1.3    77.2    -      -       -      +
    289B  SER*     1.3    57.5    +      -       -      +
    291B  THR*     3.8     4.3    +      -       -      -
    292B  ARG*     3.0    32.3    +      -       +      +
    295B  ARG*     5.9     0.3    +      -       -      -
----------------------------------------------------------
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Residues in contact with SER 289 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    285B  ALA      3.5    15.3    +      -       -      -
    286B  ARG*     3.1    15.0    +      -       -      -
    288B  ALA*     1.3    77.5    -      -       -      +
    290B  ILE*     1.3    67.6    +      -       -      +
    292B  ARG*     3.2     6.8    +      -       -      +
    293B  ALA*     3.0    22.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 290 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    271B  GLU*     4.3    21.1    -      -       +      +
    274B  VAL*     3.9    22.7    -      -       +      -
    275B  GLN*     6.0     2.9    -      -       +      -
    278B  LEU*     3.6    25.4    -      -       +      -
    286B  ARG*     3.0    26.1    +      -       +      +
    287B  ALA*     4.3     3.6    -      -       -      +
    289B  SER*     1.3    74.6    -      -       -      +
    291B  THR*     1.3    58.5    +      -       -      +
    293B  ALA*     3.0    10.6    +      -       +      +
    294B  SER*     3.0    28.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with THR 291 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    214B  ALA      5.2     0.2    -      -       -      +
    215B  PHE*     3.1    42.2    -      -       +      +
    217B  SER      5.3     2.2    -      -       -      +
    223B  ASN*     6.4     0.4    -      -       -      +
    271B  GLU*     3.2    19.8    +      -       -      +
    275B  GLN*     2.4    35.6    +      -       -      +
    287B  ALA      3.2    12.8    +      -       -      -
    288B  ALA*     4.0     4.5    -      -       -      -
    289B  SER      3.4     0.6    -      -       -      -
    290B  ILE*     1.3    76.1    -      -       -      +
    292B  ARG*     1.3    62.5    +      -       -      +
    294B  SER*     3.0     4.5    +      -       -      -
    295B  ARG*     3.0    28.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 292 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    288B  ALA      3.0    21.5    +      -       -      +
    289B  SER*     3.2     6.2    +      -       -      +
    291B  THR*     1.3    75.8    -      -       -      +
    293B  ALA*     1.3    61.6    +      -       -      +
    295B  ARG*     3.4    52.4    +      -       -      +
    296B  ILE*     4.2    23.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 293 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    289B  SER      3.0    12.7    +      -       -      +
    290B  ILE*     3.2    13.0    -      -       +      +
    292B  ARG*     1.3    75.8    -      -       -      +
    294B  SER*     1.3    65.6    +      -       -      +
    296B  ILE*     3.3     5.2    +      -       -      +
    297B  ALA*     3.0    27.5    +      -       +      +
----------------------------------------------------------
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Residues in contact with SER 294 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    215B  PHE*     3.6    22.2    -      -       -      -
    271B  GLU*     2.8    35.8    +      -       -      +
    290B  ILE*     3.0     9.0    +      -       -      +
    291B  THR      3.2     9.4    -      -       -      -
    293B  ALA*     1.3    77.4    -      -       -      +
    295B  ARG*     1.3    63.8    +      -       -      +
    296B  ILE      3.0     1.9    +      -       -      -
    297B  ALA*     4.5     1.8    -      -       -      -
    298B  PHE*     3.0    43.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 295 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    215B  PHE*     3.2    36.8    +      -       +      -
    216B  TRP*     3.5    58.6    -      -       +      +
    288B  ALA      5.9     0.4    +      -       -      -
    291B  THR*     3.0    19.1    +      -       -      +
    292B  ARG*     3.4    54.9    -      -       -      +
    293B  ALA      3.2     0.8    -      -       -      -
    294B  SER*     1.3    74.4    -      -       -      +
    296B  ILE*     1.3    62.5    +      -       +      +
    299B  PRO*     3.4    19.7    -      -       -      +
    277E  TYR*     3.6    38.3    +      -       -      -
----------------------------------------------------------
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Residues in contact with ILE 296 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    292B  ARG*     4.3    25.8    -      -       -      +
    293B  ALA*     3.3     6.2    +      -       -      +
    294B  SER      3.1     0.2    -      -       -      -
    295B  ARG*     1.3    82.8    -      -       +      +
    297B  ALA*     1.3    70.8    +      -       -      +
    298B  PHE      3.2     1.6    -      -       -      -
    299B  PRO*     3.1    14.0    -      -       +      +
    300B  VAL*     3.1    30.3    +      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 297 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    293B  ALA*     3.0    20.5    +      -       +      +
    294B  SER*     4.3     1.3    -      -       -      +
    296B  ILE*     1.3    81.2    -      -       -      +
    298B  PHE*     1.3    62.9    +      -       +      +
    300B  VAL*     3.1     5.5    +      -       -      +
    301B  VAL*     2.8    46.8    +      -       +      +
----------------------------------------------------------
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Residues in contact with PHE 298 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    212B  TRP*     3.5    33.5    -      +       +      -
    215B  PHE*     3.5    25.8    -      +       +      -
    264B  PHE*     4.1     8.4    -      +       +      -
    267B  VAL*     3.9    25.1    -      -       +      -
    268B  ALA*     3.5    38.4    -      -       +      -
    271B  GLU*     4.6     7.0    -      -       +      -
    294B  SER*     3.0    36.8    +      -       -      +
    297B  ALA*     1.3    82.4    -      -       +      +
    299B  PRO*     1.4    67.2    -      -       +      +
    301B  VAL*     3.7     4.4    +      -       +      +
    302B  PHE*     3.3    21.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with PRO 299 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    209B  PHE*     6.1     1.6    -      -       +      -
    212B  TRP*     4.2    29.4    -      -       +      +
    215B  PHE*     5.7     0.4    -      -       +      -
    294B  SER      3.8     0.9    -      -       -      +
    295B  ARG*     3.4    21.8    -      -       -      +
    296B  ILE*     3.1    18.4    -      -       +      +
    298B  PHE*     1.4    87.6    -      -       +      +
    300B  VAL*     1.3    57.7    +      -       +      +
    302B  PHE*     3.4     3.6    -      -       +      +
    303B  LEU*     2.9    30.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 300 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    296B  ILE*     3.1    37.3    +      -       +      +
    297B  ALA*     3.1     6.3    +      -       -      +
    299B  PRO*     1.3    76.1    -      -       +      +
    301B  VAL*     1.3    60.0    +      -       +      +
    303B  LEU*     3.3     6.7    +      -       +      +
    304B  LEU*     2.7    45.8    +      -       +      +
----------------------------------------------------------
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Residues in contact with VAL 301 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    264B  PHE*     3.4    27.1    -      -       +      -
    297B  ALA*     2.8    34.5    +      -       +      +
    298B  PHE*     4.2     3.6    -      -       +      +
    300B  VAL*     1.3    73.9    -      -       +      +
    302B  PHE*     1.3    51.6    +      -       -      +
    304B  LEU*     3.2    10.5    +      -       +      +
    305B  ALA*     2.4    44.2    +      -       +      +
----------------------------------------------------------
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Residues in contact with PHE 302 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    205B  LEU*     3.4    34.8    -      -       +      -
    208B  LEU*     3.4    24.2    -      -       +      -
    209B  PHE*     4.5    14.8    -      +       -      -
    212B  TRP*     4.0     5.2    -      +       +      -
    257B  ILE*     5.4     1.8    -      -       +      -
    260B  MET*     3.9     9.2    -      -       +      -
    261B  ILE*     3.8    21.1    -      -       +      -
    264B  PHE*     3.4    32.6    -      +       +      -
    298B  PHE      3.3     9.3    +      -       -      +
    299B  PRO*     3.4     9.0    -      -       +      +
    301B  VAL*     1.3    77.1    -      -       -      +
    303B  LEU*     1.3    60.1    +      -       +      +
    305B  ALA*     2.9     2.0    +      -       -      +
    306B  ASN*     2.6    64.6    +      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 303 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    299B  PRO      2.9    20.7    +      -       -      +
    300B  VAL*     3.8     6.7    -      -       +      +
    302B  PHE*     1.3    78.2    -      -       +      +
    304B  LEU*     1.3    60.4    +      -       +      +
    306B  ASN*     4.1     4.7    -      -       -      +
    307B  ILE*     3.1    51.0    +      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 304 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    300B  VAL*     2.7    30.4    +      -       +      +
    301B  VAL*     3.3    10.8    -      -       +      +
    303B  LEU*     1.3    74.5    -      -       +      +
    305B  ALA*     1.3    52.6    +      -       -      +
    307B  ILE*     2.8    18.3    +      -       +      +
    308B  ILE*     2.6    55.8    +      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 305 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    260B  MET*     3.5    32.3    -      -       +      +
    264B  PHE*     4.6     4.0    -      -       +      -
    301B  VAL*     2.4    37.5    +      -       +      +
    302B  PHE*     3.6     1.6    -      -       -      +
    304B  LEU*     1.3    67.4    -      -       -      +
    306B  ASN*     1.3    58.3    +      -       -      +
    308B  ILE*     3.4    11.9    -      -       -      +
    309B  LEU*     2.7    31.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASN 306 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    205B  LEU*     5.8     1.4    -      -       -      +
    253B  TYR*     4.4    15.2    +      -       -      -
    257B  ILE*     4.4    21.6    -      -       -      +
    260B  MET*     3.8     9.1    -      -       -      +
    302B  PHE*     2.6    58.4    +      -       -      +
    303B  LEU*     4.3     5.8    -      -       -      +
    305B  ALA*     1.3    70.1    -      -       -      +
    307B  ILE*     1.3    57.2    +      -       +      +
    309B  LEU*     3.7     3.8    -      -       -      +
    310B  ALA*     2.5    40.4    +      -       +      +
----------------------------------------------------------
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Residues in contact with ILE 307 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    303B  LEU*     3.1    35.8    +      -       +      +
    304B  LEU*     2.8    21.2    +      -       +      +
    306B  ASN*     1.3    71.2    -      -       +      +
    308B  ILE*     1.3    69.9    -      -       +      +
    310B  ALA*     4.2     5.1    -      -       -      +
    311B  PHE*     3.2    25.4    +      -       +      +
----------------------------------------------------------
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Residues in contact with ILE 308 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    304B  LEU*     2.6    50.3    +      -       +      +
    305B  ALA*     3.4    11.2    -      -       -      +
    307B  ILE*     1.3    80.2    -      -       +      +
    309B  LEU*     1.3    65.3    +      -       +      +
    311B  PHE*     4.1     4.8    -      -       -      +
    312B  LEU*     3.3    31.1    +      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 309 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    253B  TYR*     4.4     3.1    -      -       +      -
    256B  ALA*     3.6    32.8    -      -       +      +
    257B  ILE*     3.6    19.7    -      -       +      +
    260B  MET*     3.6    26.9    -      -       +      -
    305B  ALA      2.7    18.9    +      -       -      +
    306B  ASN*     3.7     4.5    -      -       -      +
    308B  ILE*     1.3    76.6    -      -       +      +
    310B  ALA*     1.3    67.5    +      -       -      +
    312B  LEU*     3.0    26.9    +      -       +      +
    313B  PHE*     3.3    27.8    +      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 310 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    253B  TYR*     3.8    25.3    -      -       +      +
    306B  ASN*     2.5    24.1    +      -       +      +
    307B  ILE*     4.2     4.7    -      -       -      +
    309B  LEU*     1.3    74.2    -      -       -      +
    311B  PHE*     1.3    62.8    +      -       -      +
    313B  PHE      3.4     0.2    +      -       -      -
    314B  PHE*     3.4    28.8    +      -       +      +
----------------------------------------------------------
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Residues in contact with PHE 311 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    307B  ILE*     3.2    18.2    +      -       +      +
    308B  ILE*     4.1     3.1    -      -       -      +
    310B  ALA*     1.3    79.2    -      -       -      +
    312B  LEU*     1.3    71.7    +      -       +      +
    313B  PHE      2.9     6.1    +      -       -      -
    315B  GLY*     3.3    42.2    +      -       -      +
    316B  PHE*     3.5    30.7    +      +       +      +
----------------------------------------------------------
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Residues in contact with LEU 312 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    308B  ILE*     3.3    25.7    +      -       +      +
    309B  LEU*     3.0    22.0    +      -       +      +
    311B  PHE*     1.3    90.9    -      -       +      +
    313B  PHE*     1.3    64.4    +      -       +      +
    316B  PHE*     4.1    29.8    -      -       +      +
----------------------------------------------------------
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Residues in contact with PHE 313 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    116B  ARG*     3.8    30.7    -      -       +      +
    117B  ARG*     4.7    11.4    +      -       +      +
    251B  MET*     3.4    34.5    -      -       +      -
    252B  THR      3.6    11.9    -      -       -      -
    253B  TYR*     3.6    31.4    -      +       +      -
    256B  ALA*     4.2    12.3    -      -       +      -
    309B  LEU*     3.3    24.1    +      -       +      +
    310B  ALA      4.0     2.5    -      -       -      +
    311B  PHE      2.9     1.4    +      -       -      -
    312B  LEU*     1.3    83.3    -      -       +      +
    314B  PHE*     1.3    81.9    +      -       +      +
    315B  GLY      3.7     0.2    -      -       -      -
    316B  PHE*     3.6    11.8    -      -       -      +
----------------------------------------------------------
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Residues in contact with PHE 314 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    117B  ARG*     3.8    53.1    +      -       +      +
    120B  PHE*     3.4    44.9    -      +       +      -
    253B  TYR*     4.2    30.3    -      +       -      -
    310B  ALA*     3.4    16.0    +      -       +      +
    313B  PHE*     1.3    87.8    -      -       +      +
    315B  GLY*     1.3    59.5    +      -       -      +
    316B  PHE*     3.1     9.8    +      -       -      +
----------------------------------------------------------
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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