Contacts of the helix formed by residues 511 - 537 (chain A) in PDB entry 4C48


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 GLY 511 (chain A).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    509A  LYS      3.5     2.7    +      -       -      +
    510A  LYS*     1.3    69.4    -      -       -      +
    512A  PHE*     1.3    65.8    -      -       -      -
    513A  PHE*     2.8     8.0    +      -       -      -
    514A  GLY*     2.9    14.9    +      -       -      -
    515A  TRP*     3.7     4.1    +      -       -      +
    518A  ARG*     5.1     1.0    +      -       -      -
----------------------------------------------------------
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Residues in contact with PHE 512 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    357A  LEU*     4.4    27.4    -      -       +      -
    360A  GLN*     5.3     0.9    -      -       -      -
    511A  GLY*     1.3    69.4    -      -       -      -
    513A  PHE*     1.3    95.5    +      +       +      +
    515A  TRP*     3.1    53.5    +      +       +      +
    516A  PHE*     3.0    41.4    +      +       +      +
     16C  PRO*     6.6     0.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with PHE 513 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    356A  TYR*     3.6    39.0    -      +       -      -
    357A  LEU*     5.6     3.4    -      -       -      -
    360A  GLN*     3.1    44.1    +      -       +      +
    509A  LYS*     4.3    12.1    -      -       +      -
    510A  LYS      4.0    17.3    -      -       -      +
    511A  GLY*     2.8     1.9    +      -       -      -
    512A  PHE*     1.3   103.4    -      +       +      +
    514A  GLY*     1.3    53.7    +      -       -      +
    516A  PHE*     3.4     1.5    +      -       -      +
    517A  ASN*     2.4    38.9    +      -       -      -
----------------------------------------------------------
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Residues in contact with GLY 514 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    506A  GLY      4.4     5.8    -      -       -      -
    507A  GLU      4.0    14.4    -      -       -      -
    509A  LYS*     4.0    10.4    +      -       -      +
    511A  GLY      2.9     8.6    +      -       -      -
    513A  PHE*     1.3    76.1    -      -       -      +
    515A  TRP*     1.3    65.1    +      -       -      +
    517A  ASN*     3.1     5.4    +      -       -      +
    518A  ARG*     2.9    44.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with TRP 515 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    511A  GLY      3.7     3.6    +      -       -      +
    512A  PHE*     3.1    54.7    +      +       +      +
    514A  GLY*     1.3    74.0    -      -       -      +
    516A  PHE*     1.3    66.9    +      +       -      +
    518A  ARG*     3.1    16.7    +      -       +      +
    519A  MET*     2.8    67.2    +      -       +      +
----------------------------------------------------------
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Residues in contact with PHE 516 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    357A  LEU*     3.2    43.5    -      -       +      -
    358A  PHE*     4.0    20.6    -      +       -      -
    360A  GLN*     3.9    12.8    -      -       -      +
    512A  PHE*     3.0    32.8    +      +       +      +
    513A  PHE      3.4     8.7    -      -       -      +
    514A  GLY      3.2     0.2    -      -       -      -
    515A  TRP*     1.3    84.0    -      +       -      +
    517A  ASN*     1.3    63.1    +      -       -      +
    519A  MET*     3.2     2.6    +      -       +      +
    520A  PHE*     2.8    48.6    +      +       +      +
     19C  MET*     3.6    30.5    -      -       +      -
     23C  LEU*     5.3     4.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with ASN 517 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    358A  PHE      5.3     3.3    -      -       -      +
    360A  GLN*     2.7    33.8    +      -       -      +
    505A  HIS*     3.4    24.1    -      -       +      +
    506A  GLY*     4.0    20.4    +      -       -      +
    507A  GLU*     4.7     5.2    -      -       +      -
    513A  PHE      2.4    31.7    +      -       -      +
    514A  GLY      3.1     6.7    +      -       -      +
    516A  PHE*     1.3    80.9    -      -       -      +
    518A  ARG*     1.3    57.4    +      -       -      +
    520A  PHE*     3.9     5.0    -      -       -      +
    521A  GLU*     3.1    32.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 518 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    507A  GLU*     2.9    48.0    +      -       +      +
    508A  GLY*     4.8     2.6    -      -       -      -
    509A  LYS      4.6     5.1    +      -       -      -
    511A  GLY      5.1     1.0    +      -       -      -
    514A  GLY*     2.9    38.7    +      -       -      +
    515A  TRP*     3.2    15.2    -      -       -      +
    517A  ASN*     1.3    77.2    -      -       -      +
    519A  MET*     1.3    61.0    +      -       +      +
    521A  GLU*     3.3     6.1    +      -       -      +
    522A  LYS*     2.8    31.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with MET 519 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    515A  TRP*     2.8    52.9    +      -       +      +
    516A  PHE*     4.1     3.1    -      -       +      +
    518A  ARG*     1.3    76.7    -      -       +      +
    520A  PHE*     1.3    55.4    +      -       -      +
    522A  LYS*     3.5    34.8    -      -       +      +
    523A  SER*     2.5    36.1    +      -       -      -
     23C  LEU*     6.3     0.7    -      -       -      -
----------------------------------------------------------
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Residues in contact with PHE 520 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    358A  PHE*     3.7    22.0    -      +       -      -
    505A  HIS*     6.1     2.9    -      +       -      -
    516A  PHE*     2.8    34.8    +      +       +      +
    517A  ASN*     3.9     5.4    -      -       -      +
    519A  MET*     1.3    75.8    -      -       -      +
    521A  GLU*     1.3    57.9    +      -       +      +
    523A  SER*     2.9     9.7    +      -       -      -
    524A  THR*     2.7    48.3    +      -       +      -
    972A  LEU*     4.4     5.8    -      -       +      -
    973A  ARG*     3.4    56.8    -      -       +      -
    976A  LEU*     3.8    25.4    -      -       +      -
     19C  MET*     5.4     0.2    -      -       +      -
     23C  LEU*     4.4    18.6    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLU 521 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    505A  HIS*     3.6    36.1    +      -       +      +
    507A  GLU*     4.1    19.1    -      -       -      +
    517A  ASN      3.1    18.4    +      -       -      +
    518A  ARG*     3.7     4.7    -      -       -      +
    520A  PHE*     1.3    82.3    -      -       +      +
    522A  LYS*     1.3    57.6    +      -       -      +
    524A  THR*     3.3    15.2    -      -       -      +
    525A  HIS*     3.0    26.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 522 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    518A  ARG*     2.8    16.3    +      -       -      +
    519A  MET*     3.5    42.2    -      -       +      +
    521A  GLU*     1.3    72.2    -      -       -      +
    523A  SER*     1.3    68.0    +      -       -      +
    524A  THR      2.9     2.9    +      -       -      -
    525A  HIS*     3.0     7.9    +      -       -      +
    526A  HIS*     3.0    25.0    +      -       +      +
     27C  TYR*     6.4     2.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with SER 523 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    519A  MET      2.5    22.4    +      -       -      -
    520A  PHE*     2.9    17.7    +      -       -      -
    522A  LYS*     1.3    74.4    -      -       -      +
    524A  THR*     1.3    55.2    +      -       -      +
    526A  HIS*     3.7     7.5    -      -       -      +
    527A  TYR*     3.0    29.1    +      -       -      +
    972A  LEU*     5.5     2.0    -      -       -      +
     23C  LEU*     4.3    30.8    -      -       -      +
     26C  ILE*     5.3     7.2    -      -       -      +
     27C  TYR*     6.1     5.8    -      -       -      -
----------------------------------------------------------
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Residues in contact with THR 524 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    520A  PHE*     2.7    30.5    +      -       +      -
    521A  GLU*     3.3    21.3    -      -       -      +
    522A  LYS      2.9     0.6    +      -       -      -
    523A  SER*     1.3    74.7    -      -       -      +
    525A  HIS*     1.3    62.5    +      -       -      +
    527A  TYR*     3.1     7.1    +      -       -      +
    528A  THR*     2.7    37.4    +      -       -      +
    969A  ARG*     3.9    26.9    -      -       +      +
    972A  LEU*     4.3    21.5    -      -       +      +
    973A  ARG*     5.7     0.7    -      -       +      +
----------------------------------------------------------
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Residues in contact with HIS 525 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    521A  GLU*     3.0    12.3    +      -       -      +
    522A  LYS*     3.0    10.3    +      -       -      +
    524A  THR*     1.3    73.8    -      -       -      +
    526A  HIS*     1.3    64.8    +      -       -      +
    528A  THR*     3.1     7.5    +      -       -      -
    529A  ASP*     2.5    35.3    +      -       +      +
    969A  ARG*     6.2     1.1    -      -       -      +
   2040A   NI      2.0    41.8    -      -       +      +
----------------------------------------------------------
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Residues in contact with HIS 526 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    522A  LYS*     3.0    14.1    +      -       +      +
    523A  SER*     3.7    12.3    -      -       -      +
    525A  HIS*     1.3    77.0    -      -       -      +
    527A  TYR*     1.3    58.6    +      -       -      +
    529A  ASP*     3.8     5.0    -      -       -      +
    530A  SER*     2.9    40.8    +      -       -      -
     26C  ILE      5.4     0.4    +      -       -      -
     27C  TYR*     3.4    48.2    -      +       +      -
     30C  GLY*     4.2     5.7    -      -       -      -
     31C  GLU*     3.7    26.3    +      -       +      +
     34C  ASN*     4.2    10.3    -      -       -      -
----------------------------------------------------------
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Residues in contact with TYR 527 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    523A  SER      3.0    16.4    +      -       -      +
    524A  THR*     3.1     4.9    +      -       -      +
    526A  HIS*     1.3    81.7    +      -       -      +
    528A  THR*     1.3    63.8    +      -       -      +
    530A  SER*     3.2     7.7    +      -       -      -
    531A  VAL*     2.9    39.8    +      -       +      +
    968A  VAL*     3.1    36.0    -      -       +      +
    972A  LEU*     3.5    31.4    -      -       +      -
   1019A  ILE*     2.3    58.0    +      -       +      +
   1020A  PHE*     3.4    39.0    -      +       -      -
     26C  ILE*     5.2    11.0    -      -       +      +
     30C  GLY*     6.3     0.7    -      -       -      -
----------------------------------------------------------
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Residues in contact with THR 528 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    524A  THR*     2.7    25.6    +      -       -      +
    525A  HIS*     3.6     6.9    -      -       -      -
    527A  TYR*     1.3    78.5    -      -       -      +
    529A  ASP*     1.3    62.6    +      -       -      +
    530A  SER      3.0     1.3    -      -       -      -
    531A  VAL*     3.0     6.1    +      -       -      +
    532A  GLY      3.0    24.4    +      -       -      -
    965A  LEU*     3.4    32.6    -      -       +      +
    968A  VAL*     4.9     2.5    -      -       +      -
    969A  ARG*     3.6    49.3    -      -       +      +
----------------------------------------------------------
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Residues in contact with ASP 529 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    525A  HIS*     2.5    28.5    +      -       +      +
    526A  HIS*     3.8     4.9    -      -       -      +
    528A  THR*     1.3    73.6    -      -       -      +
    530A  SER*     1.3    58.8    +      -       -      +
    532A  GLY*     3.6     3.6    +      -       -      +
    533A  GLY*     3.6    14.0    +      -       -      -
    965A  LEU*     5.6     0.2    -      -       -      -
   2040A   NI      1.8    47.2    -      -       -      +
     34C  ASN*     4.9     1.8    -      -       -      +
----------------------------------------------------------
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Residues in contact with SER 530 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    526A  HIS*     2.9    37.8    +      -       -      -
    527A  TYR*     3.3    13.5    -      -       -      -
    528A  THR      3.0     0.2    -      -       -      -
    529A  ASP*     1.3    75.2    -      -       -      +
    531A  VAL*     1.3    64.0    +      -       -      +
    532A  GLY      3.2     0.2    -      -       -      -
    533A  GLY*     3.2     3.6    +      -       -      -
    534A  ILE*     3.1    28.8    +      -       -      +
   1020A  PHE*     4.8     6.7    -      -       -      -
     30C  GLY*     3.7    17.4    +      -       -      -
     33C  PHE*     5.6     1.2    -      -       -      +
     34C  ASN*     3.7    23.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 531 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    527A  TYR*     2.9    57.2    +      -       +      +
    528A  THR*     3.0     8.4    +      -       -      +
    530A  SER*     1.3    72.8    -      -       -      +
    532A  GLY*     1.3    65.6    +      -       -      +
    534A  ILE*     3.8     9.4    -      -       +      -
    535A  LEU*     2.9    30.8    +      -       +      +
    964A  THR*     4.8     0.4    -      -       +      -
    965A  LEU*     4.5    11.0    -      -       +      -
    968A  VAL*     4.5     9.0    -      -       +      -
   1019A  ILE      4.5     2.2    -      -       -      +
   1020A  PHE*     4.2    11.0    -      -       +      +
   1023A  PRO*     4.1    28.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLY 532 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    528A  THR      3.0    13.3    +      -       -      -
    529A  ASP*     3.6     6.5    +      -       -      -
    530A  SER      3.2     0.4    -      -       -      -
    531A  VAL*     1.3    76.1    -      -       -      +
    533A  GLY*     1.3    60.0    +      -       -      +
    535A  LEU*     3.2     6.7    +      -       -      +
    536A  ARG*     3.1    21.5    +      -       -      +
    961A  ILE*     6.3     0.9    -      -       -      -
    965A  LEU*     3.8    15.1    -      -       -      +
----------------------------------------------------------
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Residues in contact with GLY 533 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    529A  ASP      3.6     8.5    +      -       -      -
    530A  SER*     3.2     8.0    +      -       -      -
    532A  GLY*     1.3    73.7    -      -       -      +
    534A  ILE*     1.3    63.1    +      -       -      +
    535A  LEU      3.3     0.5    +      -       -      -
    536A  ARG*     3.3    15.4    +      -       -      +
    537A  SER*     3.6     3.8    +      -       -      -
     33C  PHE      5.7     0.7    -      -       -      -
     34C  ASN*     5.5     4.3    -      -       -      -
     37C  SER*     3.0    24.2    +      -       -      -
----------------------------------------------------------
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Residues in contact with ILE 534 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    530A  SER*     3.1    15.8    +      -       -      +
    531A  VAL*     3.4    11.2    +      -       +      +
    533A  GLY*     1.3    74.3    -      -       -      +
    535A  LEU*     1.3    58.0    +      -       +      +
    537A  SER      3.1    16.8    +      -       -      -
    538A  THR*     3.9     2.1    +      -       -      -
    541A  TYR*     3.4    49.8    +      -       +      +
   1020A  PHE*     3.6    48.2    -      -       +      +
   1021A  PHE*     6.5     0.2    -      -       +      -
   1023A  PRO*     6.2     0.2    -      -       +      -
   1024A  VAL*     3.7    26.3    -      -       +      +
     33C  PHE*     3.9    23.3    +      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 535 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    531A  VAL*     2.9    20.5    +      -       +      +
    532A  GLY*     3.6     5.4    -      -       -      +
    534A  ILE*     1.3    74.7    -      -       +      +
    536A  ARG*     1.3    63.8    +      -       -      +
    537A  SER      3.2     1.0    +      -       -      -
    538A  THR*     4.0     6.9    +      -       -      +
    961A  ILE*     4.1    20.6    -      -       +      -
    964A  THR*     3.5    31.9    -      -       +      -
    965A  LEU*     3.6    18.2    -      -       +      -
   1023A  PRO*     3.9    20.2    -      -       +      -
   1024A  VAL*     4.0     9.2    -      -       +      +
   1027A  VAL*     3.6    39.2    -      -       +      +
   1031A  ARG*     3.4    19.6    +      -       -      -
----------------------------------------------------------
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Residues in contact with ARG 536 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    532A  GLY      3.1    11.3    +      -       -      +
    533A  GLY*     3.3    12.1    +      -       -      +
    535A  LEU*     1.3    78.1    -      -       -      +
    537A  SER*     1.3    59.6    +      -       -      +
    538A  THR*     3.5     3.6    +      -       -      +
   1031A  ARG*     4.8    10.9    +      -       -      +
     37C  SER*     5.4     0.2    -      -       -      +
     38C  GLY      4.6     1.4    -      -       -      +
     40C  GLY*     5.6     2.9    +      -       -      -
----------------------------------------------------------
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Residues in contact with SER 537 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    533A  GLY      3.6     0.7    +      -       -      -
    534A  ILE      3.1    12.9    +      -       -      -
    536A  ARG*     1.3    79.4    -      -       -      +
    538A  THR*     1.3    64.5    +      -       -      +
    539A  GLY      3.0     4.4    +      -       -      -
    540A  ARG*     3.7     6.6    +      -       -      +
    541A  TYR*     3.1    19.1    -      -       -      -
     37C  SER*     2.7    25.9    +      -       -      -
     38C  GLY      2.6    42.1    +      -       -      -
     39C  VAL      4.7     2.2    -      -       -      -
     40C  GLY*     5.1     0.4    -      -       -      +
----------------------------------------------------------
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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