Contacts of the helix formed by residues 325 - 350 (chain A) in PDB entry 4OGB


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 PRO 325 (chain A).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    102A  TRP*     5.1     5.8    -      -       +      +
    103A  GLY*     4.0    25.6    -      -       -      +
    323A  THR      4.5     1.6    -      -       -      +
    324A  LYS*     1.3    89.9    -      -       +      +
    326A  LEU*     1.3    56.3    -      -       -      +
    327A  GLN*     3.1     6.3    -      -       +      +
    328A  LEU*     2.7    36.1    +      -       +      +
    329A  TYR      3.1     4.2    +      -       -      -
    398A  THR*     4.2    10.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 326 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    324A  LYS      3.3     4.3    +      -       -      -
    325A  PRO*     1.3    72.0    -      -       -      +
    327A  GLN*     1.3    56.1    +      -       -      +
    329A  TYR*     3.8    19.3    -      -       +      -
    330A  ARG*     2.8    54.9    +      -       +      +
    402A  ASN*     3.8    25.1    +      -       +      +
    405A  TRP*     3.6    56.3    -      -       +      +
    406A  TYR*     4.5     0.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLN 327 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    105A  HIS*     5.5     2.8    -      -       -      -
    325A  PRO*     3.0     6.3    +      -       +      +
    326A  LEU*     1.3    78.7    -      -       -      +
    328A  LEU*     1.3    62.9    +      -       +      +
    330A  ARG*     4.3     3.8    -      -       -      +
    331A  GLN*     3.4    31.1    +      -       +      +
    513A  DMS      3.6    26.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 328 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    103A  GLY*     3.7    26.0    -      -       -      +
    104A  LEU      3.5    24.9    -      -       -      +
    105A  HIS*     5.3     1.8    -      -       -      +
    106A  VAL*     4.6     5.4    -      -       +      -
    107A  PHE*     3.8    29.3    -      -       +      -
    324A  LYS*     4.0    15.0    -      -       +      +
    325A  PRO*     2.7    26.9    +      -       +      +
    327A  GLN*     1.3    73.7    -      -       +      +
    329A  TYR*     1.3    66.6    +      -       -      +
    331A  GLN*     3.0    16.0    +      -       -      +
    332A  TRP*     3.1    23.0    +      -       +      +
    513A  DMS      4.0    21.8    -      -       +      +
----------------------------------------------------------
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Residues in contact with TYR 329 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    321A  ASN*     3.3    33.1    +      -       +      +
    322A  PRO*     3.5    26.6    -      -       +      +
    324A  LYS      3.8    10.1    -      -       -      +
    325A  PRO      3.1     2.4    +      -       -      -
    326A  LEU*     3.8    11.4    -      -       +      +
    328A  LEU*     1.3    76.9    -      -       -      +
    330A  ARG*     1.3    56.9    +      -       -      +
    332A  TRP*     3.1     7.1    +      -       -      +
    333A  THR*     2.8    46.0    +      -       -      -
    369A  GLN*     2.3    39.3    +      -       -      +
    373A  ILE*     3.6    14.8    -      -       +      +
    402A  ASN*     3.7    29.6    -      -       +      -
    406A  TYR*     3.4    29.4    -      +       -      -
----------------------------------------------------------
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Residues in contact with ARG 330 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    326A  LEU*     2.8    41.1    +      -       +      +
    327A  GLN*     4.3     4.7    -      -       -      +
    329A  TYR*     1.3    69.9    -      -       -      +
    331A  GLN*     1.3    61.4    +      -       +      +
    333A  THR*     3.8     6.4    -      -       -      -
    334A  ASP*     2.9    45.1    +      -       -      +
    405A  TRP*     3.4    43.6    -      -       -      -
    406A  TYR*     4.0    10.5    -      -       -      +
----------------------------------------------------------
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Residues in contact with GLN 331 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    107A  PHE*     3.5    47.1    -      -       +      +
    327A  GLN*     3.4    23.0    +      -       +      +
    328A  LEU*     3.0    10.2    +      -       -      +
    330A  ARG*     1.3    77.9    -      -       +      +
    332A  TRP*     1.3    63.8    +      -       -      +
    334A  ASP*     3.4    10.6    +      -       -      +
    335A  ARG*     3.1    32.5    +      -       -      +
    513A  DMS      3.6    27.2    -      -       -      +
----------------------------------------------------------
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Residues in contact with TRP 332 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    106A  VAL*     4.0     9.4    -      -       +      +
    107A  PHE*     3.4    35.6    -      +       -      -
    159A  TYR*     3.5    27.8    -      +       +      -
    161A  ASN*     5.2     0.7    -      -       -      -
    163A  ILE*     3.9    10.8    -      -       +      -
    164A  HIS*     3.7    40.4    -      -       +      -
    167A  ASP*     3.6    31.1    +      -       +      -
    321A  ASN*     3.4    43.7    -      -       +      +
    324A  LYS*     5.4     3.9    -      -       +      +
    328A  LEU*     3.1    32.6    +      -       +      +
    329A  TYR*     3.4     6.7    -      -       -      +
    331A  GLN*     1.3    77.0    -      -       -      +
    333A  THR*     1.3    57.4    +      -       -      +
    335A  ARG*     3.1    13.1    +      -       -      +
    336A  ILE*     2.9    30.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with THR 333 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    329A  TYR*     2.8    45.1    +      -       -      -
    330A  ARG      3.8     3.8    -      -       -      -
    331A  GLN      3.3     0.2    -      -       -      -
    332A  TRP*     1.3    73.5    -      -       -      +
    334A  ASP*     1.3    66.3    +      -       -      +
    336A  ILE*     3.3     6.9    -      -       +      +
    337A  MET*     2.9    33.2    +      -       +      +
    365A  VAL*     3.9    17.7    -      -       +      -
    369A  GLN*     3.9    26.5    +      -       +      +
    406A  TYR*     3.4    23.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASP 334 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    330A  ARG*     2.9    30.6    +      -       -      +
    331A  GLN*     3.6     9.6    -      -       -      +
    333A  THR*     1.3    78.6    -      -       -      +
    335A  ARG*     1.3    57.8    +      -       +      +
    337A  MET*     3.8     4.8    -      -       -      +
    338A  GLU*     2.9    31.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 335 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    107A  PHE*     3.2    41.7    -      -       -      -
    158A  ALA*     2.8    59.0    +      -       +      +
    159A  TYR*     3.9     8.5    -      -       +      -
    161A  ASN*     3.8    10.7    -      -       -      +
    163A  ILE*     4.0    14.9    -      -       -      +
    331A  GLN*     3.1    23.5    +      -       -      +
    332A  TRP*     3.7    14.3    -      -       -      +
    334A  ASP*     1.3    77.2    -      -       +      +
    336A  ILE*     1.3    61.5    +      -       -      +
    338A  GLU*     3.2     7.9    +      -       -      +
    339A  GLU*     2.9    28.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 336 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    159A  TYR*     3.7    41.8    -      -       +      -
    160A  HIS*     4.0    13.0    -      -       +      +
    332A  TRP      2.9    13.7    +      -       -      +
    333A  THR*     3.3    19.1    -      -       +      +
    335A  ARG*     1.3    76.0    -      -       -      +
    337A  MET*     1.3    63.7    +      -       +      +
    339A  GLU*     3.2     5.4    +      -       +      +
    340A  PHE*     2.7    73.7    +      -       +      -
    369A  GLN*     5.0     0.7    -      -       -      +
    501A  2SR      3.9    28.9    -      -       +      +
----------------------------------------------------------
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Residues in contact with MET 337 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    333A  THR*     2.9    32.8    +      -       +      +
    334A  ASP*     3.8     5.6    -      -       -      +
    336A  ILE*     1.3    81.2    -      -       +      +
    338A  GLU*     1.3    57.3    -      -       -      +
    340A  PHE*     3.7    14.2    -      -       +      +
    341A  PHE*     2.9    79.4    +      -       +      -
    357A  MET*     3.7    24.5    -      -       +      +
    363A  ALA*     4.9     4.0    -      -       +      -
    365A  VAL*     3.9    31.2    -      -       +      -
    368A  SER*     5.7     3.4    -      -       -      +
    369A  GLN*     5.0     7.0    -      -       -      -
    501A  2SR      5.8     0.2    -      -       -      -
----------------------------------------------------------
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Residues in contact with GLU 338 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    158A  ALA*     3.7    11.1    -      -       +      +
    334A  ASP      2.9    19.8    +      -       -      +
    335A  ARG*     3.5     8.9    -      -       -      +
    337A  MET*     1.3    76.8    -      -       -      +
    339A  GLU*     1.3    61.5    +      -       -      +
    341A  PHE*     4.2     7.1    -      -       -      +
    342A  ARG*     2.4    63.9    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLU 339 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    157A  VAL*     3.2     6.9    -      -       +      +
    158A  ALA*     4.3     6.2    -      -       +      +
    159A  TYR*     2.9    18.0    +      -       +      +
    160A  HIS*     2.6    54.6    +      -       -      -
    204A  HIS*     4.0     1.0    -      -       -      -
    206A  GLY*     3.4    40.2    -      -       -      +
    335A  ARG      2.9    13.1    +      -       -      +
    336A  ILE*     3.5    13.1    -      -       +      +
    338A  GLU*     1.3    78.3    -      -       -      +
    340A  PHE*     1.3    66.0    +      -       +      +
    342A  ARG*     3.4     8.7    +      -       -      +
    343A  GLN*     3.1    20.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with PHE 340 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    160A  HIS*     5.5     2.7    -      +       -      -
    336A  ILE*     2.7    53.8    +      -       +      +
    337A  MET*     3.7    15.5    -      -       -      +
    339A  GLU*     1.3    76.3    -      -       +      +
    341A  PHE*     1.3    60.6    +      -       -      +
    343A  GLN*     3.0    11.1    +      -       +      +
    344A  GLY      2.9    23.6    +      -       -      -
    356A  PRO      5.3     0.4    -      -       -      -
    357A  MET*     3.6    53.2    -      -       +      +
    358A  CYS*     3.3    24.6    -      -       -      +
    501A  2SR      3.8    33.4    -      +       +      -
----------------------------------------------------------
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Residues in contact with PHE 341 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    337A  MET*     2.9    60.8    +      -       +      +
    338A  GLU*     4.2     6.1    -      -       -      +
    340A  PHE*     1.3    72.9    -      -       -      +
    342A  ARG*     1.3    51.9    +      -       +      +
    344A  GLY*     3.1     1.4    +      -       -      -
    345A  ASP*     2.7    42.2    +      -       -      +
    357A  MET      3.7     8.3    -      -       -      -
    358A  CYS      3.5    10.6    -      -       -      +
    359A  ASP      3.9     0.2    -      -       -      -
    360A  LYS*     3.5    51.5    -      -       +      +
    363A  ALA*     3.8    20.2    -      -       +      -
    365A  VAL*     4.6     7.6    -      -       +      -
----------------------------------------------------------
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Residues in contact with ARG 342 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    156A  ASP*     3.4    26.0    +      -       -      +
    158A  ALA*     3.6    17.5    -      -       -      +
    338A  GLU*     2.4    60.8    +      -       +      +
    339A  GLU*     3.6     7.3    -      -       -      +
    340A  PHE      3.2     0.4    -      -       -      -
    341A  PHE*     1.3    80.3    -      -       +      +
    343A  GLN*     1.3    60.2    +      -       -      +
    345A  ASP*     3.5    12.0    +      -       +      +
    346A  ARG*     3.1    32.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLN 343 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    206A  GLY      4.4     2.2    +      -       -      +
    207A  VAL*     3.3    18.7    -      -       +      -
    208A  SER*     3.0    46.1    +      -       -      -
    211A  PHE*     3.8    18.7    -      -       +      +
    339A  GLU      3.1    11.4    +      -       -      +
    340A  PHE*     3.0    15.0    +      -       -      +
    342A  ARG*     1.3    73.8    -      -       -      +
    344A  GLY*     1.3    61.2    +      -       -      +
    346A  ARG*     3.2     6.3    +      -       -      +
    347A  GLU*     2.9    53.9    +      -       -      +
    355A  SER*     3.3    13.9    +      -       -      -
    358A  CYS*     4.5     8.5    -      -       -      -
----------------------------------------------------------
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Residues in contact with GLY 344 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    340A  PHE      2.9    10.7    +      -       -      -
    341A  PHE      3.1     0.4    +      -       -      -
    343A  GLN*     1.3    77.5    -      -       -      +
    345A  ASP*     1.3    57.0    +      -       -      +
    347A  GLU*     3.3    14.0    +      -       -      -
    348A  ARG*     2.9    30.7    +      -       -      +
    354A  ILE*     3.2    14.1    -      -       -      +
    358A  CYS*     3.2    25.3    -      -       -      +
----------------------------------------------------------
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Residues in contact with ASP 345 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    341A  PHE*     2.7    26.1    +      -       -      +
    342A  ARG*     3.6    13.5    -      -       +      +
    344A  GLY*     1.3    73.8    -      -       -      +
    346A  ARG*     1.3    59.1    +      -       +      +
    348A  ARG*     2.7    29.5    +      -       -      +
    349A  GLU*     2.9    41.7    +      -       +      +
    360A  LYS*     3.1    31.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 346 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    205A  PRO*     4.3    11.7    +      -       -      +
    206A  GLY      5.4     0.2    -      -       -      -
    207A  VAL*     3.6    29.7    -      -       -      +
    211A  PHE*     4.3    22.4    -      -       +      -
    342A  ARG*     3.1    22.2    +      -       -      +
    343A  GLN*     3.2     4.7    +      -       -      +
    345A  ASP*     1.3    76.3    -      -       +      +
    347A  GLU*     1.3    61.6    +      -       -      +
    349A  GLU*     3.5    19.8    -      -       -      +
    350A  ARG*     3.2    34.8    +      -       -      +
    116C  ARG*     4.6     4.0    -      -       -      +
    151C  ASP*     3.0    41.7    +      -       -      +
    152C  HIS*     5.4     1.2    +      -       -      -
    501C  EDO      4.3    18.0    +      -       -      -
----------------------------------------------------------
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Residues in contact with GLU 347 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    211A  PHE*     3.6    22.6    -      -       +      +
    214A  ASN*     5.9     0.7    +      -       -      -
    343A  GLN*     2.9    35.0    +      -       -      +
    344A  GLY*     3.5    16.3    +      -       -      +
    346A  ARG*     1.3    77.2    -      -       -      +
    348A  ARG*     1.3    60.8    +      -       -      +
    350A  ARG*     3.2     6.4    +      -       -      -
    352A  MET*     2.9    48.7    +      -       +      +
    353A  GLU      3.8     7.7    -      -       -      +
    354A  ILE*     3.5     8.7    -      -       +      -
    355A  SER*     2.3    50.6    +      -       -      -
    358A  CYS*     4.2     0.2    -      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 348 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    344A  GLY      2.9    16.8    +      -       -      +
    345A  ASP*     2.7    33.7    +      -       -      +
    347A  GLU*     1.3    68.3    -      -       -      +
    349A  GLU*     1.3    64.6    +      -       -      +
    350A  ARG      2.8     7.6    +      -       -      -
    351A  GLY*     3.0    13.1    +      -       -      +
    352A  MET      4.5     2.2    -      -       -      -
    354A  ILE*     3.4    23.8    -      -       +      +
    359A  ASP*     3.4    30.5    +      -       -      +
    360A  LYS*     4.0    19.6    -      -       -      +
    361A  HIS*     4.0    20.8    +      -       -      -
----------------------------------------------------------
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Residues in contact with GLU 349 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    345A  ASP*     2.9    26.7    +      -       +      +
    346A  ARG*     3.5    22.0    -      -       -      +
    348A  ARG*     1.3    75.2    -      -       -      +
    350A  ARG*     1.3    59.3    +      -       +      +
    351A  GLY      3.6     0.4    +      -       -      -
    116C  ARG*     3.1    38.9    +      -       -      +
    143C  ILE*     4.9     4.7    -      -       -      +
    144C  THR*     5.5     0.5    +      -       -      -
    147C  MET*     3.4    40.5    -      -       +      +
    151C  ASP*     5.1     0.2    -      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 350 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    211A  PHE*     4.3     7.5    -      -       -      -
    215A  THR*     3.9    23.6    -      -       -      +
    346A  ARG*     3.2    33.3    +      -       -      +
    347A  GLU      3.2     3.7    +      -       -      +
    348A  ARG      2.9     1.2    -      -       -      -
    349A  GLU*     1.3    83.6    +      -       +      +
    351A  GLY*     1.3    62.4    +      -       -      +
    352A  MET*     3.0    27.0    +      -       +      +
    144C  THR*     4.3    31.8    +      -       +      +
    147C  MET*     4.3    12.2    -      -       -      +
    148C  THR*     3.2    36.4    +      -       -      +
    151C  ASP*     3.0    26.3    +      -       -      -
    243C  GLU*     4.7     4.6    +      -       -      -
    246C  CYS*     5.5     1.0    -      -       -      -
    501C  EDO      4.7     2.8    +      -       -      -
----------------------------------------------------------
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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