Contacts of the helix formed by residues 522 - 546 (chain A) in PDB entry 5VOT


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 ALA 522 (chain A).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    518A  LEU      4.7     6.3    +      -       -      -
    519A  ASP      4.7     2.1    +      -       -      -
    521A  LEU*     1.3    80.6    -      -       -      +
    523A  TYR*     1.3    61.6    +      -       -      +
    524A  GLU*     3.1    30.5    -      -       -      +
    525A  ILE*     3.5    18.4    -      -       +      +
    526A  TRP*     2.8    27.1    +      -       -      -
    788B  SER      4.6     0.2    -      -       -      +
    789B  LEU*     4.9     4.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with TYR 523 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    518A  LEU*     6.1     5.6    -      -       +      -
    522A  ALA*     1.3    71.3    -      -       -      +
    524A  GLU*     1.3    91.8    +      -       +      +
    525A  ILE      3.1     1.6    -      -       -      -
    526A  TRP*     2.8    28.0    +      -       -      +
    527A  MET*     2.9    42.1    +      -       +      +
    174F  TYR*     5.2     7.0    +      +       -      -
    175F  SER*     5.3     3.6    -      -       -      -
    176F  TYR*     3.3    28.3    +      +       -      -
    181F  TYR*     4.1    11.4    +      -       -      -
----------------------------------------------------------
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Residues in contact with GLU 524 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    522A  ALA*     3.1    23.4    -      -       +      +
    523A  TYR*     1.3    96.4    +      -       +      +
    525A  ILE*     1.3    67.7    -      -       +      +
    527A  MET*     3.1    24.6    +      -       +      +
    528A  CYS*     2.9    28.2    +      -       -      -
    789B  LEU*     5.3     6.2    -      -       -      +
    157F  ILE*     4.5    18.6    -      -       +      -
    174F  TYR*     5.3     7.3    +      -       -      -
    176F  TYR*     3.7    30.4    +      -       +      +
----------------------------------------------------------
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Residues in contact with ILE 525 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    521A  LEU*     3.7    23.1    -      -       +      -
    522A  ALA*     3.5    25.3    +      -       +      +
    523A  TYR      3.1     0.4    -      -       -      -
    524A  GLU*     1.3    81.0    -      -       +      +
    526A  TRP*     1.3    63.6    +      -       +      +
    528A  CYS*     3.0    10.8    +      -       +      +
    529A  ILE*     2.9    42.3    +      -       +      +
    612A  ILE*     4.8     6.3    -      -       +      -
    788B  SER      3.1    28.9    -      -       -      +
    789B  LEU*     3.2    24.0    -      -       -      +
    792B  VAL*     5.5    12.1    -      -       +      -
    796B  PHE*     5.9     4.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with TRP 526 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    517A  PHE*     5.4     2.7    -      +       -      -
    518A  LEU*     3.3    48.5    +      -       +      +
    520A  PRO*     6.1     0.4    -      -       -      +
    521A  LEU*     4.8    15.8    -      -       +      +
    522A  ALA      2.8    28.7    +      -       -      -
    523A  TYR*     2.8    15.0    +      -       -      +
    525A  ILE*     1.3    73.9    -      -       +      +
    527A  MET*     1.3    59.6    +      -       +      +
    529A  ILE*     2.9    30.1    +      -       +      +
    530A  VAL*     2.9    34.3    +      -       +      +
    584A  PHE*     4.5    22.2    -      +       -      -
    613A  ILE*     5.9     4.0    -      -       +      -
    616A  TYR*     4.4    27.4    -      +       +      -
    607D  PHE*     5.1    16.6    -      +       -      -
    610D  LEU*     6.2     3.6    -      -       +      -
----------------------------------------------------------
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Residues in contact with MET 527 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    523A  TYR*     2.9    47.4    +      -       +      +
    524A  GLU*     3.1    18.3    +      -       +      +
    526A  TRP*     1.3    75.6    -      -       +      +
    528A  CYS*     1.3    58.8    +      -       -      +
    530A  VAL*     3.2    10.7    +      -       -      +
    531A  PHE*     2.9    50.2    +      -       +      -
    157F  ILE*     6.4     0.2    -      -       +      -
    176F  TYR*     5.3     1.8    -      -       +      -
    180F  PHE*     5.1     7.9    -      -       +      -
    181F  TYR*     4.3    27.6    -      -       +      +
----------------------------------------------------------
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Residues in contact with CYS 528 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    524A  GLU*     2.9    19.1    +      -       -      -
    525A  ILE*     3.4     9.4    -      -       -      +
    527A  MET*     1.3    75.9    -      -       -      +
    529A  ILE*     1.3    58.0    +      -       -      +
    531A  PHE*     3.0    21.2    +      -       +      +
    532A  ALA*     2.9    30.5    +      -       -      +
    796B  PHE*     3.9    25.3    -      -       +      -
    150F  ILE*     5.4     0.5    -      -       -      +
    153F  ILE*     5.3     1.1    -      -       -      -
    154F  ILE*     4.7    20.5    -      -       +      +
    157F  ILE*     4.2    24.0    -      -       -      -
----------------------------------------------------------
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Residues in contact with ILE 529 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    521A  LEU*     5.2     2.0    -      -       +      -
    525A  ILE*     2.9    36.0    +      -       +      +
    526A  TRP*     2.9    38.8    +      -       +      +
    528A  CYS*     1.3    75.0    -      -       -      +
    530A  VAL*     1.3    58.9    +      -       +      +
    532A  ALA*     3.6     5.2    +      -       -      +
    533A  TYR*     2.9    32.1    +      -       +      +
    584A  PHE*     4.0    29.2    -      -       +      -
    605A  TRP*     5.0     1.8    -      -       +      -
    608A  PHE*     4.5    20.4    -      -       +      -
    612A  ILE*     4.2    19.5    -      -       +      -
    796B  PHE*     4.8     6.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with VAL 530 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    526A  TRP*     2.9    22.5    +      -       +      +
    527A  MET*     3.4    10.8    -      -       +      +
    529A  ILE*     1.3    77.1    -      -       +      +
    531A  PHE*     1.3    70.4    +      -       +      +
    533A  TYR*     3.1    11.4    +      -       +      +
    534A  ILE*     2.9    38.5    +      -       +      +
    188F  ILE*     6.1     3.6    -      -       +      -
----------------------------------------------------------
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Residues in contact with PHE 531 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    527A  MET*     2.9    41.2    +      -       +      -
    528A  CYS*     3.0    24.4    +      -       -      +
    530A  VAL*     1.3    82.7    -      -       +      +
    532A  ALA*     1.3    64.1    +      -       -      +
    534A  ILE*     3.2    10.8    -      -       +      +
    535A  GLY*     2.9    21.0    +      -       -      -
    150F  ILE*     3.6    42.8    -      -       +      +
    153F  ILE*     4.7    17.5    -      -       +      -
    154F  ILE*     6.1     0.2    -      -       +      -
    157F  ILE*     6.0     0.7    -      -       +      -
    180F  PHE*     5.8     3.6    -      +       -      -
    184F  ALA*     3.5    31.9    -      -       +      -
    187F  PHE*     6.5     0.4    -      -       +      -
    188F  ILE*     4.2    25.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 532 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    528A  CYS      2.9    16.2    +      -       -      +
    529A  ILE*     4.2     4.9    -      -       -      +
    531A  PHE*     1.3    73.8    -      -       -      +
    533A  TYR*     1.3    56.9    +      -       -      +
    535A  GLY*     4.5     1.3    -      -       -      +
    536A  VAL*     2.9    40.6    +      -       +      +
    605A  TRP*     4.5    14.6    -      -       +      -
    608A  PHE*     5.5     2.2    -      -       +      -
    796B  PHE*     5.1    10.8    -      -       +      -
    800B  VAL*     4.9    23.1    -      -       +      -
    803B  LEU*     5.7     0.2    -      -       +      -
    150F  ILE*     4.8     4.6    -      -       +      +
    154F  ILE*     6.4     1.6    -      -       +      -
----------------------------------------------------------
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Residues in contact with TYR 533 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    529A  ILE*     2.9    22.4    +      -       +      +
    530A  VAL*     3.1    13.5    -      -       +      +
    531A  PHE      3.0     0.4    -      -       -      -
    532A  ALA*     1.3    77.4    -      -       -      +
    534A  ILE*     1.3    76.8    +      -       +      +
    536A  VAL*     3.9     1.4    -      -       -      +
    537A  SER*     3.0    26.0    +      -       -      -
    577A  LEU*     3.4    33.9    +      -       +      +
    580A  SER*     3.1    26.8    +      -       -      -
    581A  LEU*     3.2    47.1    +      -       +      +
    584A  PHE*     5.0     7.6    -      +       +      -
    605A  TRP*     4.3    18.3    -      +       +      -
----------------------------------------------------------
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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  VAL*     2.9    24.2    +      -       +      +
    531A  PHE*     3.2    18.4    -      -       +      +
    533A  TYR*     1.3    87.6    -      -       +      +
    535A  GLY*     1.3    77.5    +      -       -      +
    537A  SER*     3.4     7.0    +      -       -      -
    538A  VAL*     2.9    32.5    +      -       +      +
    577A  LEU*     5.3     4.0    -      -       +      -
    150F  ILE*     4.2     9.9    -      -       +      -
    188F  ILE*     5.1    18.4    -      -       +      -
    191F  GLU*     3.9    29.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLY 535 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    531A  PHE      2.9    16.5    +      -       -      -
    532A  ALA*     3.9     1.8    -      -       -      -
    534A  ILE*     1.3    82.4    -      -       -      +
    536A  VAL*     1.3    63.9    +      -       -      +
    538A  VAL*     3.1     7.1    +      -       -      +
    539A  VAL*     2.9    29.7    +      -       -      +
    147F  LEU*     4.5    17.9    -      -       -      -
    150F  ILE*     5.4     1.3    -      -       -      -
    191F  GLU*     4.8     7.4    -      -       -      -
----------------------------------------------------------
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Residues in contact with VAL 536 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    532A  ALA*     2.9    26.5    +      -       +      +
    533A  TYR*     3.9     2.2    -      -       -      +
    535A  GLY*     1.3    70.2    -      -       -      +
    537A  SER*     1.3    65.9    +      -       -      +
    539A  VAL*     3.3     6.6    +      -       -      +
    540A  LEU*     2.9    41.3    +      -       +      +
    580A  SER*     5.1     4.0    -      -       -      +
    601A  VAL*     4.2    13.9    -      -       +      -
    605A  TRP*     4.0    39.5    -      -       +      -
    803B  LEU*     3.6    33.4    -      -       +      -
    147F  LEU*     5.4     0.4    -      -       -      +
----------------------------------------------------------
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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  TYR      3.0    19.0    +      -       -      -
    534A  ILE*     3.6     5.4    -      -       -      -
    536A  VAL*     1.3    80.0    -      -       -      +
    538A  VAL*     1.3    65.0    +      -       -      +
    540A  LEU*     3.2     9.7    +      -       -      +
    541A  PHE*     3.0    20.8    +      -       -      +
    573A  ILE*     4.9     5.2    -      -       -      -
    576A  SER*     4.6     5.6    -      -       -      -
    577A  LEU*     3.3    35.0    -      -       -      +
    580A  SER*     3.2    24.4    +      -       -      -
----------------------------------------------------------
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Residues in contact with VAL 538 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    534A  ILE*     2.9    25.9    +      -       +      +
    535A  GLY      3.6     3.6    -      -       -      +
    537A  SER*     1.3    75.0    -      -       -      +
    539A  VAL*     1.3    65.6    +      -       -      +
    541A  PHE*     2.8    22.8    +      -       +      +
    542A  LEU*     2.9    13.2    +      -       +      +
    573A  ILE*     4.5     6.7    -      -       +      -
    143F  VAL*     3.9    30.3    -      -       +      -
    191F  GLU*     4.3    19.3    -      -       +      +
    192F  MET*     6.2     1.6    -      -       -      -
    195F  VAL*     3.9    32.5    -      -       +      +
    198F  VAL*     6.2     2.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with VAL 539 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    535A  GLY*     2.9    19.6    +      -       -      +
    536A  VAL*     3.8     6.1    -      -       -      +
    538A  VAL*     1.3    74.6    -      -       -      +
    540A  LEU*     1.3    62.8    +      -       +      +
    542A  LEU*     2.9    15.7    +      -       +      +
    543A  VAL*     2.9    24.7    +      -       +      +
    601A  VAL*     5.2    11.7    -      -       +      -
    803B  LEU*     5.2    10.3    -      -       +      +
    804B  GLY*     5.5     2.5    -      -       -      -
    807B  MET*     4.2    24.5    -      -       +      -
    143F  VAL*     4.4    15.3    -      -       +      -
    147F  LEU*     4.0    28.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 540 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    536A  VAL*     2.9    34.0    +      -       +      +
    537A  SER*     3.4    11.0    -      -       -      +
    539A  VAL*     1.3    76.1    -      -       -      +
    541A  PHE*     1.3    64.7    +      -       -      +
    543A  VAL*     2.9    20.1    +      -       +      +
    544A  SER*     2.9    11.3    +      -       -      -
    570A  GLU*     5.6     2.6    -      -       +      +
    576A  SER*     5.0    12.6    -      -       -      +
    579A  PHE*     4.6    24.2    -      -       +      -
    580A  SER*     5.6     3.6    -      -       -      -
    593A  PRO*     5.8     4.9    -      -       +      -
    598A  GLY*     4.0    23.1    -      -       -      +
    601A  VAL*     3.6    34.5    -      -       +      -
    602A  GLY*     4.3     5.4    -      -       -      +
    605A  TRP*     6.1     1.8    -      -       +      -
----------------------------------------------------------
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Residues in contact with PHE 541 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    537A  SER      3.0     7.4    +      -       -      +
    538A  VAL*     2.8    15.0    +      -       +      +
    540A  LEU*     1.3    71.6    -      -       -      +
    542A  LEU*     1.3    59.7    +      -       -      +
    544A  SER*     2.8    19.0    +      -       -      +
    545A  ARG*     2.9    32.5    +      -       +      +
    570A  GLU      3.8     8.1    -      -       -      -
    571A  PHE      3.4    19.1    -      -       -      -
    572A  GLY*     3.3     9.9    -      -       -      -
    573A  ILE*     3.1    63.5    -      -       +      -
    576A  SER*     4.3     7.1    +      -       -      +
    195F  VAL*     5.1     9.6    -      -       +      -
    198F  VAL*     4.3    23.8    -      -       +      -
    199F  HIS*     5.0    21.3    -      +       +      -
    202F  ILE*     5.9     0.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 542 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    538A  VAL*     2.9    12.2    +      -       +      +
    539A  VAL*     3.2    17.7    -      -       +      +
    541A  PHE*     1.3    78.9    -      -       -      +
    543A  VAL*     1.3    63.7    +      -       +      +
    544A  SER      3.3     0.7    +      -       -      -
    545A  ARG*     4.6     2.7    -      -       +      +
    546A  PHE*     3.3    40.8    +      -       +      +
    807B  MET*     5.8     2.5    -      -       +      -
    811B  LEU*     4.4    22.9    -      -       +      +
    136F  LEU*     5.5     4.0    -      -       +      -
    140F  ILE*     4.1    32.1    -      -       +      -
    143F  VAL*     5.9     7.9    -      -       +      -
    198F  VAL*     3.8    34.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with VAL 543 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    539A  VAL*     2.9    23.8    +      -       +      +
    540A  LEU*     2.9    21.4    +      -       +      +
    542A  LEU*     1.3    76.8    -      -       +      +
    544A  SER*     1.3    63.8    +      -       -      +
    546A  PHE*     4.6     3.8    -      -       -      +
    547A  SER*     5.0     1.7    +      -       -      -
    595A  SER*     3.2    21.0    +      -       -      +
    597A  SER*     3.0    36.6    -      -       -      +
    598A  GLY*     3.6    11.4    -      -       -      +
    601A  VAL*     5.0     4.5    -      -       +      -
    807B  MET*     5.3     9.0    -      -       +      -
    811B  LEU*     6.2     2.5    -      -       +      -
    814B  PHE*     4.7    17.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with SER 544 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    540A  LEU      2.9     7.8    +      -       -      -
    541A  PHE*     2.8    13.3    +      -       -      -
    543A  VAL*     1.3    81.4    -      -       -      +
    545A  ARG*     1.3    63.7    +      -       -      -
    546A  PHE      3.3     6.8    -      -       -      +
    547A  SER*     4.9     0.3    +      -       -      -
    568A  THR*     3.8    13.3    +      -       -      +
    570A  GLU*     2.8    48.1    +      -       -      +
    571A  PHE*     3.3    12.5    +      -       -      -
----------------------------------------------------------
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Residues in contact with ARG 545 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    541A  PHE*     2.9    41.0    +      -       +      +
    542A  LEU*     4.9     3.1    -      -       +      +
    544A  SER*     1.3    71.0    -      -       -      +
    546A  PHE*     1.3    68.5    +      -       -      +
    547A  SER      4.7     1.6    -      -       -      -
    548A  PRO*     4.8     4.0    -      -       -      +
    571A  PHE*     5.3    15.7    -      -       +      +
    198F  VAL*     5.5     4.3    -      -       +      +
    202F  ILE*     3.4    36.6    -      -       +      +
----------------------------------------------------------
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Residues in contact with PHE 546 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    542A  LEU*     3.3    31.0    +      -       +      +
    543A  VAL*     4.6     2.4    +      -       -      +
    544A  SER      3.3     8.7    -      -       -      +
    545A  ARG*     1.3    85.1    -      -       -      +
    547A  SER*     1.3    98.3    +      -       -      +
    548A  PRO*     4.2     2.2    -      -       +      -
    811B  LEU*     4.4    17.0    -      -       +      -
    814B  PHE*     3.4    41.1    -      +       +      -
    815B  CYS*     4.7    11.7    -      -       +      -
    136F  LEU*     3.5    46.4    -      -       +      -
    140F  ILE*     5.6     7.6    -      -       +      -
    202F  ILE*     4.5     4.9    -      -       -      +
    205F  HIS*     5.3     4.0    -      +       -      -
----------------------------------------------------------
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A short description of the analytical approach
The contact analysis used in this page is based upon the approach developed in: Sobolev V., Wade R.C., Vriend G. and Edelman M. PROTEINS (1996) 25, 120-129. Contact legitimacy depends on the hydrophobic-hydrophilic properties of the contacting atoms. In order to define it, for each inter-atomic contact, eight atom classes have been introduced:


   I  Hydrophilic      - N and O that can donate and accept hydrogen bonds
                         (e.g., oxygen of hydroxyl group of Ser. or Thr)
  II  Acceptor         - N or O that can only accept a hydrogen bond
 III  Donor            - N that can only donate a hydrogen bond
  IV  Hydrophobic      - Cl, Br, I and all C atoms that are not in
                         aromatic rings and do not have a covalent bond to
                         a N or O atom
   V  Aromatic         - C in aromatic rings irrespective of any other 
                         bonds formed by the atom
  VI  Neutral          - C atoms that have a covalent bond to at least one
                         atom of class I or two or more atoms from class II
                         or III; atoms; S, F, P, and metal atoms in all cases
 VII  Neutral-donor    - C atoms that have a covalent bond with only one
                         atom of class III
VIII  Neutral-acceptor - C atoms that have a covalent bond with only 
                         one atom of class II
For each pair of contacts the state of legitimacy is shown below:

Legend:
+, legitimate
-, illegitimate
------------------------------------------------------------
  Atomic class           I  II  III   IV   V   VI  VII  VIII
------------------------------------------------------------
   I  (Hydrophilic)      +   +    +    -   +   +    +    +
  II  (Acceptor)         +   -    +    -   +   +    +    -
 III  (Donor)            +   +    -    -   +   +    -    +
  IV  (Hydrophobic)      -   -    -    +   +   +    +    +
   V  (Aromatic)         +   +    +    +   +   +    +    +
  VI  (Neutral)          +   +    +    +   +   +    +    +
 VII  (Neutral-donor)    +   +    -    +   +   +    -    +
VIII  (Neutral-acceptor) +   -    +    +   +   +    +    -
------------------------------------------------------------
Warning!
Atom classes for heterogroups are automatically assigned based on the atomic coordinates. However, in three cases (see below) the automatic assignment is currently ambiguous. In these cases, the user is advised to manually analyse the full list of contacts using LPC software.
1. Carbon atoms belonging to a 4-, 5- or 6-member ring are 
   considered "aromatic" (Class V) if the ring is approximately
   planar, and "hydrophobic" (Class IV) or "neutral" (Classes
   VI, VII, VIII) if the ring is non-planar.
2. The oxygen atom of a carbonyl or hydroxy group is considered
   "hydroxy" (Class I) if the CO bond is longer than 1.29 Å, and
   "carbonyl" (Class II) if shorter.
3. All nitrogen atoms are considered "hydrophilic" (Class I).

Please E-mail any questions and/or suggestions concerning this page to Vladimir.Sobolev@weizmann.ac.il