Contacts of the helix formed by residues 282 - 305 (chain A) in PDB entry 5AVL


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 SER 282 (chain A).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    280A  GLN      3.8     1.6    +      -       -      -
    281A  LEU*     1.3    73.6    -      -       -      +
    283A  ARG*     1.3    65.5    +      -       -      +
    284A  GLU*     3.7    10.0    +      -       -      +
    285A  ASP*     2.7    41.2    +      -       -      +
    286A  GLN*     3.0     9.8    +      -       -      +
    373A  GLN*     4.5    12.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 283 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    279A  LEU*     3.9    12.3    -      -       -      +
    281A  LEU      3.5     2.6    +      -       -      -
    282A  SER*     1.3    69.1    -      -       -      +
    284A  GLU*     1.3    65.0    +      -       -      +
    286A  GLN*     2.7    56.8    +      -       -      +
    287A  ILE*     2.8    20.7    +      -       +      +
    684B  THR*     4.5     5.8    -      -       +      +
    691B  HIS*     3.9    33.2    +      -       +      +
    694B  LEU*     3.5    41.8    +      -       -      +
    695B  GLN*     4.4    12.6    -      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 284 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    282A  SER*     3.1     9.7    +      -       -      +
    283A  ARG*     1.3    77.0    -      -       -      +
    285A  ASP*     1.3    61.0    +      -       -      +
    287A  ILE*     3.2     6.5    +      -       -      +
    288A  ALA*     3.0    26.2    +      -       -      +
    371A  ASN*     5.3     5.7    -      -       -      +
    373A  GLN*     6.1     1.6    -      -       +      +
    682B  SER*     3.4    14.4    -      -       -      -
    683B  LEU*     2.6    38.3    +      -       +      +
    684B  THR*     2.5    45.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASP 285 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    281A  LEU*     4.2    20.0    -      -       +      +
    282A  SER*     2.7    27.8    +      -       -      +
    284A  GLU*     1.3    71.2    -      -       -      +
    286A  GLN*     1.3    67.1    +      -       -      +
    288A  ALA*     3.3     3.9    +      -       -      +
    289A  LEU*     3.0    29.6    +      -       -      +
    371A  ASN      3.8     3.3    -      -       -      +
    372A  VAL*     3.4    15.0    -      -       +      +
    373A  GLN*     2.7    33.8    +      -       -      +
    374A  ASP*     3.0    32.3    +      -       -      +
    378A  VAL*     5.4     1.8    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLN 286 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    278A  PHE*     3.7    43.1    -      -       +      +
    279A  LEU*     3.4    27.8    +      -       -      +
    281A  LEU*     2.9    24.0    +      -       +      +
    282A  SER      3.0    10.8    +      -       -      +
    283A  ARG*     2.7    53.3    +      -       -      +
    285A  ASP*     1.3    77.7    -      -       -      +
    287A  ILE*     1.3    61.3    +      -       -      +
    289A  LEU*     3.3     3.0    +      -       -      +
    290A  LEU*     3.1    29.9    +      -       -      +
    694B  LEU*     4.0    11.1    -      -       +      +
----------------------------------------------------------
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Residues in contact with ILE 287 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    283A  ARG*     2.8    20.6    +      -       +      +
    284A  GLU      3.7     5.8    -      -       -      +
    286A  GLN*     1.3    73.5    -      -       -      +
    288A  ALA*     1.3    67.4    +      -       -      +
    289A  LEU      3.1     0.2    +      -       -      -
    291A  LYS*     2.8    29.2    +      -       +      +
    683B  LEU*     4.1    14.6    -      -       +      -
    684B  THR*     3.7    39.0    -      -       +      +
    687B  HIS*     3.9    34.3    -      -       +      +
    690B  LEU*     3.9    16.6    -      -       +      -
    691B  HIS*     4.2    19.5    -      -       +      +
    694B  LEU*     3.8    16.6    -      -       +      -
----------------------------------------------------------
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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  GLU      3.0    13.1    +      -       -      +
    285A  ASP*     3.6     9.2    -      -       -      +
    287A  ILE*     1.3    76.0    -      -       -      +
    289A  LEU*     1.3    65.2    +      -       -      +
    291A  LYS*     3.9     3.0    -      -       -      +
    292A  THR*     3.5    21.5    +      -       -      -
    369A  ARG*     4.3     5.4    -      -       -      +
    370A  PRO      3.8    14.2    -      -       -      +
    371A  ASN      3.8    23.6    -      -       -      +
    372A  VAL*     4.2     9.0    -      -       +      -
    683B  LEU*     3.8    15.2    -      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 289 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    278A  PHE*     4.3    13.2    -      -       +      -
    281A  LEU*     3.8    29.4    -      -       +      -
    285A  ASP*     3.0    17.7    +      -       +      +
    286A  GLN      3.8     3.6    -      -       -      +
    287A  ILE      3.1     0.2    -      -       -      -
    288A  ALA*     1.3    78.7    -      -       -      +
    290A  LEU*     1.3    54.4    +      -       -      +
    292A  THR*     4.2     0.2    -      -       -      -
    293A  SER*     2.7    39.6    +      -       -      -
    364A  ILE*     3.6    21.8    -      -       +      +
    365A  PHE*     3.8    16.2    -      -       +      -
    366A  SER      3.5    25.1    -      -       -      +
    369A  ARG*     4.1     8.3    +      -       +      -
    372A  VAL*     3.7    21.1    -      -       +      -
    378A  VAL*     4.0    13.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 290 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    268A  ILE*     4.0    21.8    -      -       +      -
    269A  VAL*     3.9    29.8    -      -       +      -
    272A  ALA*     3.8    21.3    -      -       +      -
    278A  PHE*     3.8    14.8    -      -       +      -
    286A  GLN      3.1    15.4    +      -       -      +
    287A  ILE      4.1     0.9    -      -       -      +
    289A  LEU*     1.3    73.7    -      -       -      +
    291A  LYS*     1.3    67.9    +      -       -      +
    293A  SER*     3.5     7.9    -      -       -      +
    294A  ALA*     3.0    29.4    +      -       +      +
    364A  ILE*     4.7     5.6    -      -       +      -
    442A  ILE*     5.3     0.8    -      -       -      +
    690B  LEU*     4.1    18.6    -      -       +      -
    694B  LEU*     3.9    24.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with LYS 291 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    287A  ILE*     2.8    27.3    +      -       +      +
    288A  ALA*     3.9     4.7    -      -       -      +
    290A  LEU*     1.3    73.5    -      -       -      +
    292A  THR*     1.3    66.3    +      -       +      +
    294A  ALA*     4.2     5.0    +      -       -      +
    295A  ILE*     5.3     0.5    +      -       -      +
    441A  GLU      3.5     2.4    +      -       -      -
    442A  ILE*     2.9    52.2    +      -       -      +
    443A  TRP*     4.6     7.3    +      -       -      -
    444A  ASP      4.9     6.9    +      -       -      -
    683B  LEU*     4.6    15.5    -      -       +      -
    686B  ARG*     5.4     2.0    -      -       -      +
    687B  HIS*     3.0    43.5    +      -       +      +
    690B  LEU*     4.3     2.3    -      -       +      +
----------------------------------------------------------
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Residues in contact with THR 292 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    288A  ALA      3.5    11.5    +      -       -      -
    289A  LEU      3.6     2.0    +      -       -      -
    290A  LEU      3.2     0.2    -      -       -      -
    291A  LYS*     1.3    85.8    -      -       -      +
    293A  SER*     1.3    62.1    +      -       -      +
    294A  ALA      3.4     0.7    -      -       -      -
    295A  ILE*     4.0    14.3    -      -       +      +
    296A  GLU*     3.9     6.1    -      -       -      +
    369A  ARG*     3.9    36.6    +      -       -      +
    370A  PRO*     4.2    22.9    +      -       +      +
    418A  SER*     4.3     7.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with SER 293 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    268A  ILE*     5.2     0.3    -      -       -      +
    289A  LEU      2.7    24.6    +      -       -      -
    290A  LEU*     3.5     9.5    -      -       -      +
    292A  THR*     1.3    78.0    -      -       -      +
    294A  ALA*     1.3    67.3    +      -       -      +
    295A  ILE      3.3     1.1    -      -       -      -
    296A  GLU*     2.8    14.3    +      -       -      +
    297A  VAL*     2.9    15.7    +      -       -      +
    363A  SER*     4.0     2.5    -      -       -      -
    364A  ILE*     3.6    35.9    -      -       -      +
    369A  ARG*     3.5    22.8    -      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 294 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    265A  VAL*     5.0     6.7    -      -       +      -
    268A  ILE*     3.6    24.6    -      -       +      +
    290A  LEU*     3.0    19.1    +      -       +      +
    291A  LYS      4.4     2.5    -      -       -      +
    292A  THR      3.4     1.0    -      -       -      -
    293A  SER*     1.3    77.5    +      -       -      +
    295A  ILE*     1.3    57.9    +      -       -      +
    297A  VAL*     3.2     2.0    +      -       -      -
    298A  MET*     2.8    39.3    +      -       +      +
    442A  ILE*     3.9    26.2    -      -       +      -
    443A  TRP*     4.9     0.2    -      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 295 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    291A  LYS      5.3     0.6    +      -       -      +
    292A  THR*     4.0    11.4    -      -       +      +
    294A  ALA*     1.3    76.4    -      -       -      +
    296A  GLU*     1.3    55.3    +      -       -      +
    298A  MET*     3.2    12.4    +      -       -      +
    299A  LEU*     2.7    54.3    +      -       +      +
    335A  PHE*     4.6     0.9    -      -       +      -
    418A  SER*     3.6    27.6    -      -       -      +
    421A  HIS*     3.7    40.6    -      -       +      +
    443A  TRP*     4.1    19.3    -      -       +      +
    501A  4KQ      3.3    28.3    -      -       +      +
----------------------------------------------------------
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Residues in contact with GLU 296 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    292A  THR      3.9     2.4    -      -       -      +
    293A  SER      2.8     8.3    +      -       -      +
    295A  ILE*     1.3    77.5    -      -       +      +
    297A  VAL*     1.3    58.9    +      -       -      +
    299A  LEU*     3.2     2.1    +      -       +      -
    300A  LEU*     2.9    33.3    +      -       -      +
    363A  SER*     3.0    15.8    +      -       -      +
    369A  ARG*     2.7    45.2    +      -       -      -
    411A  LEU*     5.5     0.7    -      -       -      +
    414A  LEU*     3.6    45.5    -      -       +      +
    415A  ARG*     3.6    13.9    +      -       -      +
    418A  SER*     3.4    27.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 297 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    268A  ILE*     3.8    28.9    -      -       +      -
    293A  SER*     2.9    20.6    +      -       -      +
    294A  ALA      3.7     6.3    -      -       -      +
    296A  GLU*     1.3    74.8    -      -       -      +
    298A  MET*     1.3    58.5    +      -       -      +
    300A  LEU*     3.0     9.6    +      -       -      +
    301A  GLU*     2.8    34.8    +      -       +      +
    360A  ILE*     3.8    46.9    -      -       +      +
    363A  SER*     4.8     4.3    -      -       -      +
    364A  ILE*     4.1    20.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with MET 298 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    261A  ALA*     3.4    39.5    -      -       +      +
    264A  SER*     3.5    20.9    -      -       -      +
    265A  VAL*     3.5    21.1    -      -       +      +
    268A  ILE*     4.0     3.6    -      -       +      -
    294A  ALA*     2.8    19.9    +      -       +      +
    295A  ILE*     3.3    13.2    -      -       -      +
    297A  VAL*     1.3    76.1    -      -       -      +
    299A  LEU*     1.3    56.4    +      -       -      +
    301A  GLU*     3.3     7.4    +      -       -      +
    302A  THR*     2.8    32.4    +      -       -      -
    443A  TRP*     3.6    33.0    -      -       +      -
    501A  4KQ      3.8    29.0    -      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 299 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    295A  ILE*     2.7    41.2    +      -       +      +
    296A  GLU*     3.7     5.2    -      -       -      +
    297A  VAL      3.2     0.2    -      -       -      -
    298A  MET*     1.3    73.3    -      -       -      +
    300A  LEU*     1.3    59.8    +      -       -      +
    302A  THR*     3.5     4.5    -      -       -      +
    303A  SER*     3.0    27.5    +      -       -      -
    335A  PHE*     4.7     4.5    -      -       +      -
    339A  ILE*     4.0    24.9    -      -       +      -
    342A  PHE*     3.8    11.4    -      -       +      -
    343A  SER*     5.3     0.3    +      -       -      -
    414A  LEU*     3.8    15.9    -      -       +      +
    417A  LEU*     3.8    38.1    -      -       +      +
    418A  SER*     4.6     0.9    -      -       -      +
    501A  4KQ      3.7    30.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 300 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    296A  GLU      2.9    19.5    +      -       -      +
    297A  VAL*     3.0    10.5    +      -       -      +
    299A  LEU*     1.3    76.1    -      -       -      +
    301A  GLU*     1.3    58.8    +      -       -      +
    303A  SER*     2.9    19.0    +      -       -      -
    304A  ARG*     3.0    15.6    +      -       -      +
    342A  PHE*     4.3     2.2    -      -       +      -
    346A  MET*     3.6    29.6    -      -       +      -
    356A  PHE*     3.6    15.3    -      -       +      +
    359A  LEU*     4.1    21.5    -      -       +      +
    360A  ILE*     3.8    43.1    -      -       +      +
    363A  SER*     4.6     3.4    -      -       -      -
    410A  LYS*     5.8     0.4    -      -       +      -
    411A  LEU*     5.2     2.7    -      -       +      -
    414A  LEU*     3.6    23.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLU 301 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    221A  GLN*     3.5    23.0    +      -       -      -
    264A  SER*     5.4     3.6    -      -       -      +
    267A  GLU*     5.6     3.4    -      -       -      +
    268A  ILE*     6.1     0.9    -      -       +      -
    297A  VAL*     2.8    29.5    +      -       +      +
    298A  MET*     3.7     6.7    -      -       -      +
    300A  LEU*     1.3    73.8    -      -       -      +
    302A  THR*     1.3    63.1    +      -       -      +
    304A  ARG*     2.9    24.2    +      -       -      +
    305A  ARG*     2.5    60.7    +      -       -      +
    315A  PHE*     5.0     2.0    -      -       -      -
    360A  ILE*     3.6     8.7    -      -       +      +
    501A  4KQ      4.0    23.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with THR 302 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    298A  MET      2.8    22.3    +      -       -      -
    299A  LEU*     3.5    10.8    -      -       -      -
    300A  LEU      3.2     0.2    -      -       -      -
    301A  GLU*     1.3    76.9    -      -       -      +
    303A  SER*     1.3    63.8    +      -       -      +
    304A  ARG      3.1     0.9    +      -       -      -
    305A  ARG*     3.2    12.8    +      -       -      -
    306A  TYR      3.6     7.3    +      -       -      -
    313A  ILE*     3.8    33.8    -      -       +      +
    315A  PHE*     3.7    16.6    -      -       +      -
    326A  PHE*     4.7     0.9    -      -       +      -
    339A  ILE*     4.0    24.5    -      -       +      -
    343A  SER*     4.2     3.6    -      -       -      +
    501A  4KQ      3.3    25.6    -      -       +      +
----------------------------------------------------------
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Residues in contact with SER 303 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    299A  LEU      3.0    13.3    +      -       -      -
    300A  LEU*     2.9    18.7    +      -       -      -
    302A  THR*     1.3    76.9    -      -       -      +
    304A  ARG*     1.3    60.1    +      -       -      +
    306A  TYR*     3.6    14.1    +      -       -      +
    342A  PHE*     4.2     7.0    -      -       -      -
    343A  SER*     3.8    33.7    -      -       -      +
    346A  MET*     3.3    32.3    -      -       -      +
    347A  ASN*     5.0     7.4    +      -       -      -
    356A  PHE*     3.9     5.9    -      -       -      -
----------------------------------------------------------
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Residues in contact with ARG 304 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    221A  GLN*     3.0    30.2    +      -       -      +
    300A  LEU      3.0    16.2    +      -       -      +
    301A  GLU*     2.9    33.0    +      -       -      +
    302A  THR      3.1     0.4    -      -       -      -
    303A  SER*     1.3    78.5    -      -       -      +
    305A  ARG*     1.3    82.8    +      -       -      +
    306A  TYR      3.4     5.1    +      -       -      +
    347A  ASN*     5.8     1.2    +      -       -      -
    353A  ASP*     3.2    33.9    +      -       -      +
    356A  PHE*     3.6    55.8    -      -       +      +
    360A  ILE*     4.6     2.6    -      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 305 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    267A  GLU*     5.8     0.6    +      -       -      -
    301A  GLU*     2.5    53.0    +      -       -      +
    302A  THR*     3.2     7.7    +      -       -      +
    304A  ARG*     1.3    93.8    -      -       -      +
    306A  TYR*     1.3    59.0    +      -       -      -
    307A  ASN*     3.8     1.0    -      -       -      +
    313A  ILE*     3.6     7.1    -      -       +      -
    314A  THR*     2.9    59.1    +      -       -      +
    315A  PHE*     4.7     4.0    -      -       +      -
    501A  4KQ      2.9    45.0    +      -       -      +
----------------------------------------------------------
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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