Contacts of the helix formed by residues 520 - 546 (chain C) in PDB entry 6T8O


Residue contacts within the protein are derived with the CSU software (Sobolev V., Sorokine A., Prilusky J., Abola E.E. and Edelman M. (1999) Automated analysis of interatomic contacts in proteins. Bioinformatics, 15, 327-332). A short description of the analytical approach is given at the end of the page.
For CSU analysis of other PDB entry

Note:
Non-standard 3 letter residue codes indicate a heterogroup. To identify and analyse, use LPC software

Legend:
Dist - nearest distance (Å) between atoms of two residues
Surf - contact surface area (Å2) between two residues
HB   - hydrophilic-hydrophilic contact (hydrogen bond)
Arom - aromatic-aromatic contact
Phob - hydrophobic-hydrophobic contact
DC   - hydrophobic-hydrophilic contact (destabilizing contact)
+/-  - indicates presence/absence of a specific contacts
*    - indicates residues forming contacts  by their side chain
       (including CA atoms)
Residues in contact with ASP 520 (chain C).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    614B  ARG*     5.4     7.8    +      -       -      -
    617B  GLN*     5.0     5.2    -      -       -      +
    518C  VAL*     3.4     8.0    -      -       -      +
    519C  THR*     1.3    87.4    -      -       +      +
    521C  MET*     1.3    81.7    +      -       -      +
    522C  LYS*     3.5    16.9    +      -       -      +
    523C  GLU*     3.6    25.5    +      -       +      +
    524C  ALA*     3.2    19.8    +      -       -      +
    603C  ILE*     5.8     1.7    -      -       -      +
----------------------------------------------------------
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Residues in contact with MET 521 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    497C  ILE*     4.9     2.2    -      -       +      -
    499C  PRO*     3.6    40.8    -      -       +      -
    519C  THR      5.0     1.8    -      -       -      +
    520C  ASP*     1.3    85.0    +      -       -      +
    522C  LYS*     1.3    61.3    +      -       -      +
    523C  GLU      3.3     0.4    -      -       -      -
    524C  ALA*     3.3     6.0    +      -       -      +
    525C  ALA*     2.9    27.9    +      -       -      +
    596C  GLU      4.0     3.8    -      -       -      +
    599C  ASP*     4.0     5.6    -      -       +      -
    600C  MET*     3.6    58.9    -      -       +      +
    603C  ILE*     3.7    29.6    -      -       +      -
    604C  VAL*     3.9    21.7    -      -       +      +
----------------------------------------------------------
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Residues in contact with LYS 522 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    520C  ASP*     3.5    14.6    +      -       -      +
    521C  MET*     1.3    76.7    -      -       -      +
    523C  GLU*     1.3    60.8    +      -       +      +
    525C  ALA*     3.3     8.6    +      -       +      +
    526C  ASN*     2.9    37.0    +      -       -      +
    603C  ILE*     4.5    13.1    +      -       -      +
    604C  VAL*     4.2    27.5    -      -       +      +
----------------------------------------------------------
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Residues in contact with GLU 523 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    518C  VAL*     3.7    14.1    -      -       +      +
    519C  THR*     4.0     9.7    +      -       -      -
    520C  ASP*     3.6    31.4    +      -       +      +
    521C  MET      3.3     0.4    -      -       -      -
    522C  LYS*     1.3    79.6    -      -       +      +
    524C  ALA*     1.3    56.3    +      -       -      +
    526C  ASN*     3.3    10.1    +      -       -      +
    527C  ALA*     2.9    27.2    +      -       -      +
    720C  ILE      4.0     2.8    -      -       -      +
    721C  LEU*     4.2    31.2    -      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 524 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    497C  ILE*     3.8    19.7    -      -       +      +
    518C  VAL*     3.4     6.9    -      -       +      +
    520C  ASP      3.2    15.2    +      -       -      +
    521C  MET*     3.6    11.4    -      -       -      +
    522C  LYS      3.3     0.4    -      -       -      -
    523C  GLU*     1.3    73.2    -      -       -      +
    525C  ALA*     1.3    60.2    +      -       -      +
    527C  ALA*     3.2     6.4    +      -       -      +
    528C  LEU*     2.9    35.3    +      -       -      +
    600C  MET*     3.8    28.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 525 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    521C  MET      2.9    16.5    +      -       -      +
    522C  LYS*     3.3    11.0    +      -       +      +
    524C  ALA*     1.3    77.3    -      -       -      +
    526C  ASN*     1.3    57.3    +      -       -      +
    528C  LEU*     3.4     7.3    +      -       -      +
    529C  ARG*     2.9    56.8    +      -       -      +
    600C  MET*     5.6     1.3    -      -       +      -
    604C  VAL*     5.4     5.4    -      -       +      -
    608C  VAL*     4.7    18.6    -      -       +      -
    611C  LEU*     4.1     4.3    -      -       +      +
----------------------------------------------------------
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Residues in contact with ASN 526 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    522C  LYS*     2.9    27.3    +      -       -      +
    523C  GLU*     3.5     5.4    -      -       -      +
    524C  ALA      3.3     0.2    -      -       -      -
    525C  ALA*     1.3    77.0    -      -       -      +
    527C  ALA*     1.3    56.8    +      -       -      +
    529C  ARG*     3.4    15.1    +      -       -      +
    530C  TRP*     2.9    26.9    +      -       -      +
    720C  ILE      3.2     9.3    -      -       -      +
    721C  LEU      2.7    24.7    +      -       -      +
    722C  ALA*     3.3    33.7    -      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 527 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    495C  ILE*     4.5    15.7    -      -       +      +
    497C  ILE*     5.1     3.4    -      -       +      -
    518C  VAL*     4.7    11.4    -      -       +      -
    523C  GLU      2.9    13.8    +      -       -      +
    524C  ALA*     3.2    11.4    +      -       -      +
    526C  ASN*     1.3    75.5    -      -       -      +
    528C  LEU*     1.3    59.8    +      -       +      +
    530C  TRP*     3.3     3.8    +      -       -      +
    531C  SER*     2.9    31.2    +      -       -      -
    720C  ILE*     3.1    30.8    +      -       +      +
    721C  LEU*     5.7     0.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 528 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    495C  ILE*     6.1     0.2    -      -       +      -
    497C  ILE*     4.3    12.1    -      -       +      -
    524C  ALA      2.9    21.2    +      -       -      +
    525C  ALA*     4.0     1.6    -      -       -      +
    527C  ALA*     1.3    74.5    -      -       +      +
    529C  ARG*     1.3    61.3    +      -       -      +
    531C  SER*     3.2    10.9    +      -       -      +
    532C  VAL*     2.9    29.8    +      -       -      +
    592C  VAL*     3.9    28.3    -      -       +      -
    594C  VAL*     5.4     2.2    -      -       +      -
    600C  MET*     3.8    24.7    -      -       -      -
    608C  VAL*     5.0     2.2    -      -       +      -
    611C  LEU*     3.7    25.4    -      -       +      -
    612C  ILE*     3.7    32.1    -      -       +      -
    615C  ILE*     4.3     8.3    -      -       +      +
    626C  LEU*     5.4     2.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with ARG 529 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    525C  ALA*     2.9    51.8    +      -       -      +
    526C  ASN*     3.8    15.3    +      -       -      +
    528C  LEU*     1.3    72.1    -      -       -      +
    530C  TRP*     1.3    60.3    +      -       -      +
    532C  VAL*     3.2    10.1    +      -       -      +
    533C  ALA*     3.0    27.7    +      -       -      +
    604C  VAL*     6.2     2.0    -      -       -      +
    607C  LYS*     5.3    15.2    +      -       -      +
    608C  VAL*     6.0     2.8    -      -       -      +
    611C  LEU*     3.9    23.0    -      -       +      +
----------------------------------------------------------
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Residues in contact with TRP 530 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    495C  ILE*     4.0     5.8    -      -       +      -
    514C  LEU*     3.6    36.8    -      -       +      -
    526C  ASN      2.9    15.5    +      -       -      +
    527C  ALA      3.4     7.2    -      -       -      +
    529C  ARG*     1.3    75.0    -      -       -      +
    531C  SER*     1.3    66.9    +      -       -      +
    533C  ALA*     3.3    10.2    +      -       +      +
    534C  GLU*     2.9    59.4    +      -       +      +
    590C  ILE*     5.4     5.4    -      -       +      -
    717C  ILE*     4.5    23.3    -      -       +      +
    719C  ASP*     3.4    27.0    +      -       -      +
    720C  ILE*     3.7    37.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with SER 531 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    495C  ILE*     3.5    24.4    -      -       -      +
    527C  ALA      2.9    14.9    +      -       -      -
    528C  LEU*     3.2    13.5    +      -       -      +
    530C  TRP*     1.3    80.1    -      -       -      +
    532C  VAL*     1.3    59.4    +      -       -      +
    534C  GLU*     3.4     4.5    +      -       -      +
    535C  MET*     2.9    29.1    +      -       -      +
    590C  ILE*     5.3     1.0    -      -       -      +
    592C  VAL*     3.9    13.8    -      -       -      +
    615C  ILE*     4.1    15.6    -      -       -      +
    624C  ILE*     4.8    12.2    -      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 532 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    528C  LEU      2.9    19.4    +      -       -      +
    529C  ARG*     3.2     8.9    +      -       -      +
    531C  SER*     1.3    76.4    -      -       -      +
    533C  ALA*     1.3    58.3    +      -       -      +
    535C  MET*     3.2    13.8    +      -       +      +
    536C  GLU*     2.9    39.3    +      -       +      +
    611C  LEU*     3.7    26.7    -      -       +      +
    614C  ARG*     5.3    12.1    -      -       +      +
    615C  ILE*     3.6    22.9    -      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 533 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    529C  ARG      3.0    13.4    +      -       -      +
    530C  TRP*     3.7    14.4    -      -       +      +
    532C  VAL*     1.3    77.6    -      -       -      +
    534C  GLU*     1.3    58.2    +      -       -      +
    536C  GLU*     3.4     7.1    +      -       -      +
    537C  ARG*     3.0    31.9    +      -       -      +
    540C  ARG*     5.3     1.2    +      -       -      -
----------------------------------------------------------
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Residues in contact with GLU 534 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    530C  TRP*     2.9    53.0    +      -       +      +
    531C  SER*     3.7     5.4    -      -       -      +
    532C  VAL      3.3     0.2    -      -       -      -
    533C  ALA*     1.3    73.7    -      -       -      +
    535C  MET*     1.3    60.2    +      -       -      +
    537C  ARG*     2.9    39.8    +      -       -      +
    538C  ARG*     2.9    65.3    +      -       -      +
    587C  LEU*     5.4     1.0    -      -       -      +
    590C  ILE*     5.1     4.7    -      -       +      -
    624C  ILE*     4.8     6.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with MET 535 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    531C  SER      2.9    16.3    +      -       -      +
    532C  VAL*     3.2    17.7    +      -       +      +
    534C  GLU*     1.3    77.2    -      -       -      +
    536C  GLU*     1.3    79.2    +      -       +      +
    538C  ARG*     3.3     3.1    +      -       -      +
    539C  TYR*     3.0    51.4    +      -       +      -
    614C  ARG*     3.7    21.5    -      -       +      +
    615C  ILE*     4.3     5.4    -      -       +      +
    618C  LYS*     3.8    18.4    -      -       +      -
    619C  ALA*     3.6    35.4    -      -       +      -
    622C  ALA*     4.1     7.4    -      -       +      -
    624C  ILE*     4.2    16.0    -      -       +      +
----------------------------------------------------------
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Residues in contact with GLU 536 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    532C  VAL*     2.9    30.7    +      -       +      +
    533C  ALA*     3.8     7.2    -      -       -      +
    535C  MET*     1.3    96.2    -      -       -      +
    537C  ARG*     1.3    57.3    +      -       -      +
    539C  TYR*     3.4     6.2    +      -       -      +
    540C  ARG*     3.0    48.8    +      -       -      +
    618C  LYS*     4.2    20.2    +      -       -      +
    520D  ASP*     4.9     5.6    -      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 537 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    533C  ALA      3.0    17.6    +      -       -      +
    534C  GLU*     2.9    49.9    +      -       -      +
    536C  GLU*     1.3    76.4    -      -       -      +
    538C  ARG*     1.3    63.7    +      -       -      +
    540C  ARG*     3.4    20.7    +      -       -      +
    541C  LEU*     2.9    56.7    +      -       -      +
    571C  LEU*     5.2     2.5    -      -       +      +
    587C  LEU*     5.2     9.9    -      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 538 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    534C  GLU*     2.9    44.5    +      -       -      +
    535C  MET*     3.8     4.7    -      -       -      +
    536C  GLU      3.3     0.2    -      -       -      -
    537C  ARG*     1.3    78.6    -      -       -      +
    539C  TYR*     1.3    60.8    +      -       -      +
    541C  LEU*     3.3     5.5    +      -       +      +
    542C  MET*     2.9    39.4    +      -       +      +
    550C  LEU*     4.4    10.5    -      -       +      +
    587C  LEU*     3.9    38.2    -      -       +      +
    588C  PRO*     3.1    34.5    +      -       -      +
    590C  ILE*     3.6    28.2    -      -       -      +
    622C  ALA*     3.3    33.1    +      -       +      -
    623C  GLY      4.2     4.0    +      -       -      -
    624C  ILE*     4.1    10.1    -      -       -      +
----------------------------------------------------------
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Residues in contact with TYR 539 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    535C  MET*     3.0    34.9    +      -       +      +
    536C  GLU*     3.8     7.2    -      -       -      +
    538C  ARG*     1.3    76.1    -      -       -      +
    540C  ARG*     1.3    60.1    +      -       +      +
    542C  MET*     3.4    19.4    +      -       +      +
    543C  ALA*     2.9    28.6    +      -       -      +
    548C  ARG      5.4     1.6    -      -       -      -
    618C  LYS*     2.6    62.6    +      -       +      +
    621C  ALA*     3.3    24.5    +      -       +      +
    622C  ALA*     3.6    24.7    -      -       +      -
    501D  MET*     3.9    36.0    +      -       +      +
    519D  THR*     5.7     0.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with ARG 540 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    533C  ALA      5.3     1.0    +      -       -      -
    536C  GLU*     3.0    33.5    +      -       -      +
    537C  ARG*     3.9    23.6    -      -       -      +
    538C  ARG      3.3     0.2    -      -       -      -
    539C  TYR*     1.3    76.4    -      -       +      +
    541C  LEU*     1.3    57.9    +      -       -      +
    543C  ALA*     3.4     7.9    +      -       -      +
    544C  ALA*     2.9    27.2    +      -       -      +
    571C  LEU*     4.4    11.8    -      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 541 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    537C  ARG*     2.9    43.6    +      -       -      +
    538C  ARG*     3.9     6.3    -      -       +      +
    540C  ARG*     1.3    74.1    -      -       -      +
    542C  MET*     1.3    62.4    +      -       +      +
    544C  ALA*     3.2     6.7    +      -       -      +
    545C  MET*     2.9    28.8    +      -       +      +
    553C  PHE*     3.6    39.3    -      -       +      -
    569C  ASP*     4.8     7.4    -      -       -      +
    570C  PRO*     4.4     9.6    -      -       +      -
    571C  LEU*     4.2    13.0    -      -       +      +
    584C  LEU*     4.0    20.9    -      -       +      -
    587C  LEU*     5.1     9.6    -      -       +      -
----------------------------------------------------------
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Residues in contact with MET 542 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    538C  ARG*     2.9    28.1    +      -       +      +
    539C  TYR*     3.7    37.0    -      -       +      +
    541C  LEU*     1.3    76.0    -      -       +      +
    543C  ALA*     1.3    60.9    +      -       -      +
    545C  MET*     4.8     0.4    -      -       -      -
    546C  GLY*     2.8    22.2    +      -       -      -
    547C  VAL*     3.0    39.0    +      -       +      +
    548C  ARG      4.5     3.6    -      -       -      +
    549C  ASN*     3.5    35.0    -      -       -      +
    550C  LEU*     4.1    11.2    -      -       +      -
    553C  PHE*     4.6    11.2    -      -       +      -
    587C  LEU*     6.4     1.3    -      -       +      -
    621C  ALA      4.4     1.8    -      -       -      +
    622C  ALA*     4.3    16.8    -      -       -      -
----------------------------------------------------------
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Residues in contact with ALA 543 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    539C  TYR      2.9    17.6    +      -       -      +
    540C  ARG*     3.6     8.3    -      -       -      +
    542C  MET*     1.3    76.4    -      -       -      +
    544C  ALA*     1.3    61.2    +      -       -      +
    546C  GLY*     3.3    12.2    +      -       -      +
    547C  VAL      5.3     0.7    -      -       -      -
----------------------------------------------------------
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Residues in contact with ALA 544 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    540C  ARG      2.9    16.8    +      -       -      +
    541C  LEU*     3.2     6.0    +      -       -      +
    543C  ALA*     1.3    76.2    -      -       -      +
    545C  MET*     1.3    64.4    +      -       -      +
    570C  PRO*     3.9    23.1    -      -       +      +
    571C  LEU*     4.1    22.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with MET 545 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    541C  LEU*     2.9    17.9    +      -       +      +
    542C  MET      4.4     2.0    -      -       -      +
    544C  ALA*     1.3    77.2    -      -       -      +
    546C  GLY*     1.3    64.1    +      -       -      +
    547C  VAL*     3.4     6.0    +      -       +      -
    553C  PHE*     4.0    28.5    -      -       +      -
    556C  LYS*     3.9    29.2    +      -       +      +
    567C  LEU*     4.5    26.9    -      -       +      -
    568C  THR      5.0     2.0    -      -       -      +
    570C  PRO*     3.7    33.2    -      -       +      -
    584C  LEU*     4.0    13.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLY 546 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    542C  MET      2.8    10.9    +      -       -      -
    543C  ALA*     3.3    12.0    +      -       -      -
    545C  MET*     1.3    79.1    -      -       -      +
    547C  VAL*     1.3    59.9    +      -       -      +
    556C  LYS*     5.0     1.9    +      -       -      -
----------------------------------------------------------
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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