Contacts of the helix formed by residues 419 - 446 (chain B) in PDB entry 6I53


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 ASP 419 (chain B).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    305B  ILE*     4.4     4.5    -      -       -      +
    416B  ASP*     4.4     6.4    -      -       -      +
    417B  LEU      3.2     8.3    -      -       -      +
    418B  THR*     1.3    80.5    -      -       -      +
    420B  VAL*     1.3    73.8    +      -       -      +
    421B  ASN*     3.7     7.9    +      -       -      +
    422B  ALA*     3.4    29.5    +      -       +      +
    423B  ILE*     3.3    27.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 420 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    244B  TYR*     3.6    44.2    -      -       +      -
    302B  VAL*     3.7    22.0    -      -       +      +
    305B  ILE*     4.7     8.5    -      -       +      -
    306B  PHE*     3.6    42.6    -      -       +      +
    419B  ASP*     1.3    77.8    +      -       -      +
    421B  ASN*     1.3    66.4    +      -       -      +
    422B  ALA      3.2     1.1    +      -       -      -
    423B  ILE*     3.6    14.1    +      -       -      +
    424B  ASP*     3.7    13.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASN 421 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    244B  TYR*     5.7     5.6    -      -       +      -
    419B  ASP*     3.7     6.6    +      -       -      +
    420B  VAL*     1.3    78.4    -      -       -      +
    422B  ALA*     1.3    59.7    +      -       -      +
    423B  ILE      3.3     0.2    -      -       -      -
    424B  ASP*     3.5    12.1    +      -       -      +
    425B  ARG*     3.1    66.9    +      -       -      +
    428B  ARG*     5.0     5.9    +      -       -      -
    323C  ASN*     5.5     6.5    -      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 422 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    416B  ASP*     3.8    29.2    -      -       +      +
    419B  ASP*     3.4    34.4    +      -       +      +
    420B  VAL      3.2     1.0    -      -       -      -
    421B  ASN*     1.3    77.6    -      -       -      +
    423B  ILE*     1.3    60.3    +      -       -      +
    425B  ARG*     3.6     7.4    +      -       -      +
    426B  TRP*     3.0    28.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 423 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    298B  GLU*     3.3    22.2    -      -       +      +
    301B  PHE*     3.7    36.3    -      -       +      -
    302B  VAL*     4.2    13.5    -      -       +      -
    305B  ILE*     3.7    16.2    -      -       +      -
    416B  ASP      3.6    20.0    -      -       -      +
    417B  LEU*     4.5     3.8    -      -       +      -
    419B  ASP      3.3    20.4    -      -       -      +
    420B  VAL*     3.6     7.5    +      -       -      +
    421B  ASN      3.3     0.4    -      -       -      -
    422B  ALA*     1.3    72.7    -      -       -      +
    424B  ASP*     1.3    61.7    +      -       -      +
    426B  TRP*     3.3    14.7    +      -       +      +
    427B  SER*     2.9    37.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASP 424 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    240B  PHE*     4.0    23.1    -      -       -      +
    242B  ILE      4.8     3.1    -      -       -      +
    244B  TYR*     4.7     8.8    +      -       -      +
    250B  ARG*     3.0    40.7    +      -       -      -
    298B  GLU*     3.2    12.9    -      -       -      +
    302B  VAL*     4.0     4.2    -      -       -      +
    420B  VAL*     3.7    12.8    +      -       -      +
    421B  ASN*     3.5    16.8    +      -       -      +
    422B  ALA      3.3     0.4    -      -       -      -
    423B  ILE*     1.3    78.0    -      -       -      +
    425B  ARG*     1.3    58.2    +      -       -      +
    427B  SER*     3.2     3.1    +      -       -      +
    428B  ARG*     3.1    40.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 425 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    421B  ASN*     3.1    49.8    +      -       -      +
    422B  ALA*     3.8     6.5    -      -       -      +
    424B  ASP*     1.3    76.6    -      -       -      +
    426B  TRP*     1.3    61.2    +      -       -      +
    428B  ARG*     4.1    24.6    +      -       -      +
    429B  ILE*     3.9    21.8    -      -       -      +
    319C  TYR*     5.6     3.8    +      -       -      -
----------------------------------------------------------
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Residues in contact with TRP 426 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    298B  GLU*     6.1     1.1    -      -       +      -
    415B  PRO*     3.9    45.6    -      -       +      +
    416B  ASP      5.2     4.5    -      -       -      +
    422B  ALA      3.0    18.4    +      -       -      +
    423B  ILE*     3.5    15.3    -      -       +      +
    424B  ASP      3.1     0.4    -      -       -      -
    425B  ARG*     1.3    78.6    -      -       -      +
    427B  SER*     1.3    84.8    +      -       -      +
    429B  ILE*     3.3     7.1    +      -       -      +
    430B  VAL*     3.2    60.5    +      -       +      +
    431B  PHE*     5.7     7.6    -      +       -      -
----------------------------------------------------------
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Residues in contact with SER 427 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    240B  PHE*     3.6    35.2    -      -       -      -
    298B  GLU*     3.7    16.4    +      -       -      +
    423B  ILE*     2.9    18.5    +      -       -      +
    424B  ASP      3.2     0.9    +      -       -      -
    426B  TRP*     1.3    90.6    -      -       -      +
    428B  ARG*     1.3    64.2    +      -       -      +
    429B  ILE      3.2     2.6    +      -       -      -
    430B  VAL*     4.0     6.3    -      -       -      +
    431B  PHE*     3.5    31.9    +      -       -      +
    432B  PRO*     3.9     1.2    -      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 428 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    240B  PHE*     2.8    41.8    +      -       +      -
    241B  TRP*     3.5    50.0    -      -       +      +
    242B  ILE      5.5     0.8    +      -       -      -
    421B  ASN*     5.0     5.9    +      -       -      -
    424B  ASP*     3.1    30.4    +      -       -      +
    425B  ARG*     4.3    25.5    -      -       -      +
    426B  TRP      3.3     0.6    -      -       -      -
    427B  SER*     1.3    77.1    -      -       -      +
    429B  ILE*     1.3    62.6    +      -       +      +
    432B  PRO*     3.3    20.7    -      -       -      +
    319C  TYR*     3.3    45.9    +      -       -      -
    323C  ASN*     5.4     1.0    +      -       -      -
----------------------------------------------------------
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Residues in contact with ILE 429 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    425B  ARG      3.9    17.3    -      -       -      +
    426B  TRP*     3.3     6.1    +      -       -      +
    427B  SER      3.2     0.2    -      -       -      -
    428B  ARG*     1.3    85.1    -      -       +      +
    430B  VAL*     1.3    66.6    +      -       +      +
    431B  PHE      3.5     0.4    -      -       -      -
    432B  PRO*     3.7     4.2    -      -       -      +
    433B  PHE*     3.3    23.9    +      -       +      +
----------------------------------------------------------
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Residues in contact with VAL 430 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    426B  TRP*     3.2    61.3    +      -       +      +
    427B  SER*     3.8     4.5    +      -       -      -
    429B  ILE*     1.3    81.1    -      -       +      +
    431B  PHE*     1.3    63.9    +      -       +      +
    433B  PHE*     2.9     9.1    +      -       +      +
    434B  THR*     2.5    53.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with PHE 431 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    237B  TRP*     3.2    37.0    -      +       +      +
    240B  PHE*     3.4    38.1    -      +       +      -
    291B  PHE*     5.0    14.1    -      +       +      -
    294B  LEU*     4.1    39.5    -      -       +      -
    295B  ALA*     4.1     7.0    -      -       +      -
    298B  GLU*     4.8     4.0    -      -       +      -
    426B  TRP*     5.7     7.6    -      +       -      -
    427B  SER*     3.5    18.1    +      -       -      +
    430B  VAL*     1.3    91.9    -      -       +      +
    432B  PRO*     1.3    66.4    -      -       +      +
    434B  THR*     4.3     9.9    -      -       +      +
    435B  PHE*     3.3    15.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with PRO 432 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    237B  TRP*     3.9    30.5    -      -       +      -
    241B  TRP*     5.2     8.7    -      -       +      -
    427B  SER      3.9     1.3    -      -       -      +
    428B  ARG*     3.3    29.4    -      -       -      +
    429B  ILE*     3.7     7.0    -      -       -      +
    431B  PHE*     1.3    91.8    -      -       +      +
    433B  PHE*     1.3    54.4    +      -       -      -
    436B  SER*     3.3    21.9    -      -       -      -
----------------------------------------------------------
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Residues in contact with PHE 433 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    429B  ILE*     3.3    20.9    +      -       +      +
    430B  VAL*     2.9     9.0    +      -       +      +
    432B  PRO*     1.3    78.9    -      -       -      +
    434B  THR*     1.3    64.3    +      -       -      +
    435B  PHE      3.4     0.2    -      -       -      -
    436B  SER*     3.8     4.7    -      -       -      -
    437B  LEU*     3.2    59.9    +      -       +      +
----------------------------------------------------------
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Residues in contact with THR 434 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    291B  PHE*     3.6    20.6    -      -       +      -
    430B  VAL*     2.5    39.6    +      -       -      +
    431B  PHE*     4.5     7.6    -      -       +      -
    433B  PHE*     1.3    75.3    -      -       -      +
    435B  PHE*     1.3    60.9    +      -       -      +
    437B  LEU*     3.3     9.3    +      -       +      +
    438B  PHE*     3.0    23.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with PHE 435 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    230B  ILE*     4.6    20.2    -      -       +      -
    233B  THR*     4.1    20.0    -      -       +      -
    234B  ILE*     5.3     2.9    -      -       +      -
    237B  TRP*     3.6    26.0    -      +       +      -
    284B  TYR*     4.1     7.9    -      -       -      -
    288B  CYS*     3.6    31.9    -      -       -      -
    291B  PHE*     3.6    38.7    -      +       +      -
    431B  PHE      3.3    18.4    +      -       -      +
    434B  THR*     1.3    76.3    -      -       -      +
    436B  SER*     1.3    62.4    +      -       -      +
    438B  PHE*     3.1    21.4    +      +       -      +
    439B  ASN*     3.2    35.9    +      -       -      -
----------------------------------------------------------
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Residues in contact with SER 436 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    432B  PRO      3.3    21.6    +      -       -      -
    433B  PHE*     3.6     8.9    +      -       -      -
    434B  THR      3.3     0.6    -      -       -      -
    435B  PHE*     1.3    80.5    -      -       -      +
    437B  LEU*     1.3    61.4    +      -       -      +
    439B  ASN*     3.8     7.8    +      -       -      +
    440B  LEU*     3.4    20.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 437 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    433B  PHE*     3.2    55.7    +      -       +      +
    434B  THR*     3.7     9.0    -      -       +      +
    435B  PHE      3.3     0.2    -      -       -      -
    436B  SER*     1.3    75.7    -      -       -      +
    438B  PHE*     1.3    60.5    +      -       -      +
    440B  LEU*     3.7    21.6    -      -       +      +
    441B  VAL*     3.1    37.1    +      -       +      +
----------------------------------------------------------
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Residues in contact with PHE 438 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    283B  MET*     3.6    25.6    -      -       +      -
    284B  TYR*     3.8    25.1    -      +       -      -
    287B  GLY*     3.7    26.5    -      -       -      -
    288B  CYS*     4.4     2.7    -      -       -      -
    291B  PHE*     3.7    27.4    -      +       +      -
    434B  THR      3.0    13.5    +      -       -      +
    435B  PHE*     3.1    21.4    +      +       -      +
    437B  LEU*     1.3    78.4    -      -       -      +
    439B  ASN*     1.3    62.6    +      -       -      +
    441B  VAL*     3.7     5.4    +      -       +      +
    442B  TYR*     3.1    33.1    +      +       +      +
----------------------------------------------------------
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Residues in contact with ASN 439 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    230B  ILE*     5.1     7.7    -      -       -      +
    284B  TYR*     3.2    35.6    +      -       -      -
    435B  PHE*     3.2    41.6    +      -       -      +
    436B  SER*     3.8     7.5    +      -       -      +
    437B  LEU      3.4     0.2    -      -       -      -
    438B  PHE*     1.3    75.6    -      -       -      +
    440B  LEU*     1.3    60.2    +      -       -      +
    442B  TYR*     4.3     1.6    -      -       -      -
    443B  TRP*     2.8    52.8    +      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 440 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    436B  SER      3.4    16.4    +      -       -      +
    437B  LEU*     3.9    22.9    -      -       +      +
    438B  PHE      3.3     0.6    -      -       -      -
    439B  ASN*     1.3    76.4    -      -       -      +
    441B  VAL*     1.3    64.0    +      -       +      +
    443B  TRP*     5.3     0.4    -      -       -      -
    444B  LEU*     3.3    48.0    +      -       +      +
----------------------------------------------------------
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Residues in contact with VAL 441 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    437B  LEU*     3.1    21.6    +      -       +      +
    438B  PHE*     4.2     6.1    -      -       +      +
    440B  LEU*     1.3    76.6    -      -       +      +
    442B  TYR*     1.3    63.8    +      -       -      +
    444B  LEU*     4.4     1.2    -      -       -      +
    445B  TYR*     3.2    27.2    +      -       +      +
----------------------------------------------------------
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Residues in contact with TYR 442 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    145B  LEU*     4.5     6.7    -      -       +      +
    226B  TYR*     2.8    39.9    +      +       -      -
    280B  ALA*     2.3    36.7    +      -       -      +
    283B  MET*     4.4    10.3    -      -       +      -
    284B  TYR*     3.8    26.4    -      +       +      +
    438B  PHE*     3.1    27.2    +      +       +      +
    439B  ASN*     3.3     4.7    +      -       -      +
    441B  VAL*     1.3    78.9    -      -       -      +
    443B  TRP*     1.3    86.2    +      +       -      +
    444B  LEU      3.1     5.0    +      -       -      -
    445B  TYR*     3.3     1.6    +      -       -      -
    446B  TYR*     3.2    59.1    +      +       -      +
----------------------------------------------------------
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Residues in contact with TRP 443 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    145B  LEU*     3.9    20.6    -      -       +      -
    218B  ILE*     4.2    17.9    -      -       +      -
    222B  ILE*     3.9    23.1    -      -       +      -
    226B  TYR*     3.5    44.2    -      +       +      -
    230B  ILE*     5.9     2.6    -      -       -      +
    284B  TYR*     4.5     4.2    +      +       -      -
    439B  ASN*     2.8    53.0    +      -       +      +
    440B  LEU*     4.4     1.1    -      -       -      -
    442B  TYR*     1.3    84.9    -      +       -      +
    444B  LEU*     1.3    66.0    +      -       +      +
    447B  VAL*     3.4    39.8    -      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 444 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    440B  LEU*     3.3    44.0    +      -       +      +
    441B  VAL*     4.4     1.3    -      -       -      +
    442B  TYR      3.1     0.8    -      -       -      -
    443B  TRP*     1.3    84.4    -      -       -      +
    445B  TYR*     1.3    61.4    +      -       -      +
    446B  TYR      3.4     1.6    -      -       -      -
    447B  VAL*     4.1    11.8    +      -       +      +
----------------------------------------------------------
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Residues in contact with TYR 445 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    142B  ARG*     3.5    22.9    +      -       -      -
    441B  VAL*     3.2    24.4    +      -       +      +
    442B  TYR      3.3     2.0    +      -       -      +
    444B  LEU*     1.3    79.4    -      -       -      +
    446B  TYR*     1.3    98.6    +      +       +      +
    447B  VAL      3.5     1.0    -      -       -      -
----------------------------------------------------------
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Residues in contact with TYR 446 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    141B  ARG      4.4     4.6    +      -       -      -
    142B  ARG*     3.4    42.5    +      -       +      +
    145B  LEU*     3.5    42.4    -      -       +      +
    280B  ALA*     3.6    26.1    -      -       +      +
    283B  MET*     3.7    27.6    -      -       +      +
    442B  TYR*     3.2    49.8    +      +       +      +
    445B  TYR*     1.3   108.4    -      +       +      +
    447B  VAL*     1.3    60.8    +      -       -      +
----------------------------------------------------------
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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