Contacts of the helix formed by residues 520 - 546 (chain F) 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 F).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    618E  LYS*     5.1     7.6    -      -       -      +
    518F  VAL*     3.7     2.1    -      -       -      +
    519F  THR*     1.3    84.3    -      -       +      +
    521F  MET*     1.3    78.8    +      -       -      +
    522F  LYS*     3.4    17.2    +      -       -      +
    523F  GLU*     3.3    25.6    +      -       +      +
    524F  ALA*     2.9    22.7    +      -       -      +
    603F  ILE*     5.9     0.3    -      -       -      +
----------------------------------------------------------
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Residues in contact with MET 521 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    617E  GLN*     3.4    28.7    -      -       -      +
    618E  LYS*     5.5     1.1    -      -       -      +
    499F  PRO*     3.6    18.2    -      -       +      -
    519F  THR      4.5     4.7    -      -       -      +
    520F  ASP*     1.3    86.2    +      -       -      +
    522F  LYS*     1.3    61.5    +      -       +      +
    524F  ALA*     3.5     7.6    -      -       -      +
    525F  ALA*     2.9    28.8    +      -       -      +
    599F  ASP      3.7    17.0    -      -       -      +
    600F  MET*     3.7    30.5    -      -       -      +
    603F  ILE*     3.7    37.9    -      -       +      -
    604F  VAL*     3.7    22.0    -      -       +      +
----------------------------------------------------------
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Residues in contact with LYS 522 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    520F  ASP*     3.4    12.7    +      -       -      +
    521F  MET*     1.3    78.6    -      -       -      +
    523F  GLU*     1.3    59.7    +      -       +      +
    525F  ALA*     3.4     7.0    +      -       +      +
    526F  ASN*     2.8    38.9    +      -       -      +
    603F  ILE*     5.4    10.9    +      -       -      +
    604F  VAL*     5.8     5.5    -      -       +      +
----------------------------------------------------------
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Residues in contact with GLU 523 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    518F  VAL*     3.6    13.1    -      -       +      +
    519F  THR*     4.3     6.8    +      -       -      -
    520F  ASP*     3.3    30.8    +      -       +      +
    521F  MET      3.2     0.2    -      -       -      -
    522F  LYS*     1.3    78.1    -      -       +      +
    524F  ALA*     1.3    58.8    +      -       -      +
    526F  ASN*     4.0     4.9    -      -       -      +
    527F  ALA*     2.9    25.6    +      -       -      +
    721F  LEU*     3.3    43.3    -      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 524 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    497F  ILE*     3.8    25.4    -      -       +      +
    518F  VAL*     3.5     7.4    -      -       -      +
    519F  THR      5.7     0.4    -      -       -      +
    520F  ASP      2.9    14.6    +      -       -      +
    521F  MET*     3.2    16.5    +      -       -      +
    523F  GLU*     1.3    76.0    -      -       -      +
    525F  ALA*     1.3    58.1    +      -       -      +
    527F  ALA*     3.2     4.5    +      -       -      +
    528F  LEU*     3.0    34.7    +      -       -      +
    600F  MET*     4.0    21.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 525 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    521F  MET      2.9    16.7    +      -       -      +
    522F  LYS*     3.8     7.6    -      -       +      +
    524F  ALA*     1.3    76.0    -      -       -      +
    526F  ASN*     1.3    57.5    +      -       -      +
    528F  LEU*     3.4     9.2    +      -       -      +
    529F  ARG*     2.9    55.5    +      -       -      +
    604F  VAL*     5.0     8.5    -      -       +      -
    607F  LYS*     6.5     0.2    -      -       -      -
    608F  VAL*     4.7    15.8    -      -       +      +
    611F  LEU*     4.2     3.7    -      -       +      +
----------------------------------------------------------
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Residues in contact with ASN 526 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    522F  LYS*     2.8    32.4    +      -       -      +
    523F  GLU*     3.6     9.9    -      -       -      +
    524F  ALA      3.2     0.2    -      -       -      -
    525F  ALA*     1.3    78.4    -      -       -      +
    527F  ALA*     1.3    57.2    +      -       -      +
    529F  ARG*     3.4    15.8    +      -       -      +
    530F  TRP*     2.9    23.6    +      -       -      +
    720F  ILE      3.2     9.9    -      -       -      +
    721F  LEU*     3.8    33.9    -      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 527 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    495F  ILE*     4.8    11.1    -      -       +      +
    497F  ILE*     4.4    17.0    -      -       +      -
    518F  VAL*     4.6    13.7    -      -       +      -
    523F  GLU      2.9    17.4    +      -       -      +
    524F  ALA*     3.2     6.7    +      -       -      +
    526F  ASN*     1.3    76.1    -      -       -      +
    528F  LEU*     1.3    59.1    +      -       -      +
    530F  TRP*     3.4     6.7    +      -       -      +
    531F  SER*     2.9    30.8    +      -       -      -
    720F  ILE*     3.9    15.7    +      -       +      -
    721F  LEU*     4.7     3.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 528 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    497F  ILE*     4.4    18.2    -      -       +      -
    524F  ALA      3.0    19.8    +      -       -      +
    525F  ALA*     3.8     1.6    -      -       -      +
    526F  ASN      3.3     0.2    -      -       -      -
    527F  ALA*     1.3    78.9    -      -       -      +
    529F  ARG*     1.3    56.3    +      -       -      +
    531F  SER*     3.2     9.4    +      -       -      +
    532F  VAL*     2.9    32.0    +      -       -      +
    592F  VAL*     4.7    11.7    -      -       +      -
    600F  MET*     4.2    11.7    -      -       -      -
    608F  VAL*     4.1    25.1    -      -       +      -
    611F  LEU*     3.8    25.6    -      -       +      -
    612F  ILE*     3.8    34.3    -      -       +      -
    615F  ILE*     5.0     6.8    -      -       +      +
    626F  LEU*     5.9     3.6    -      -       +      -
----------------------------------------------------------
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Residues in contact with ARG 529 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    525F  ALA*     2.9    48.5    +      -       -      +
    526F  ASN*     3.8    15.2    +      -       -      +
    527F  ALA      3.3     0.2    -      -       -      -
    528F  LEU*     1.3    73.1    -      -       -      +
    530F  TRP*     1.3    60.6    +      -       -      +
    532F  VAL*     3.3     9.4    +      -       -      +
    533F  ALA*     3.0    25.6    +      -       -      +
    607F  LYS*     4.0    34.1    -      -       -      +
    611F  LEU*     3.9    22.7    -      -       +      +
----------------------------------------------------------
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Residues in contact with TRP 530 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    495F  ILE*     4.0    12.3    -      -       +      -
    514F  LEU*     3.6    32.3    -      -       +      -
    526F  ASN      2.9    17.1    +      -       -      +
    527F  ALA      3.7     3.8    -      -       -      +
    528F  LEU      3.3     0.2    -      -       -      -
    529F  ARG*     1.3    75.9    -      -       -      +
    531F  SER*     1.3    62.8    +      -       -      +
    533F  ALA*     3.2    12.6    +      -       +      +
    534F  GLU*     2.9    55.3    +      -       +      +
    590F  ILE*     5.4     4.3    -      -       +      -
    717F  ILE*     4.6    26.2    -      -       +      +
    719F  ASP*     4.1     9.2    +      -       +      +
    720F  ILE*     3.6    45.5    -      -       +      +
----------------------------------------------------------
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Residues in contact with SER 531 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    495F  ILE*     3.9    21.5    -      -       -      +
    527F  ALA      2.9    16.4    +      -       -      -
    528F  LEU*     3.2    15.9    +      -       -      +
    530F  TRP*     1.3    78.2    -      -       -      +
    532F  VAL*     1.3    59.4    +      -       -      +
    534F  GLU*     3.4     4.6    +      -       -      +
    535F  MET*     2.9    28.9    +      -       -      +
    590F  ILE*     5.4     0.6    -      -       -      +
    592F  VAL*     4.1    15.8    -      -       -      +
    615F  ILE*     4.3    12.0    -      -       -      +
    624F  ILE*     4.5    13.9    -      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 532 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    528F  LEU      2.9    18.7    +      -       -      +
    529F  ARG*     3.4     9.4    -      -       -      +
    531F  SER*     1.3    76.6    -      -       -      +
    533F  ALA*     1.3    56.8    +      -       -      +
    535F  MET*     3.3     5.2    +      -       +      +
    536F  GLU*     2.9    33.2    +      -       +      +
    611F  LEU*     3.9    26.5    -      -       +      +
    614F  ARG*     3.4    35.4    -      -       -      +
    615F  ILE*     3.7    24.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 533 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    529F  ARG      3.0    14.2    +      -       -      +
    530F  TRP*     3.2    17.9    +      -       +      +
    532F  VAL*     1.3    78.1    -      -       -      +
    534F  GLU*     1.3    55.9    +      -       -      +
    536F  GLU*     3.3     6.6    +      -       -      +
    537F  ARG*     3.0    31.9    +      -       -      +
    540F  ARG*     5.1     1.2    +      -       -      -
----------------------------------------------------------
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Residues in contact with GLU 534 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    530F  TRP*     2.9    48.0    +      -       +      +
    531F  SER*     3.7     8.1    -      -       -      +
    532F  VAL      3.3     0.2    -      -       -      -
    533F  ALA*     1.3    72.1    -      -       -      +
    535F  MET*     1.3    61.0    +      -       -      +
    537F  ARG*     3.3    32.1    +      -       -      +
    538F  ARG*     2.8    70.9    +      -       -      +
    587F  LEU*     4.9     1.2    -      -       -      +
    590F  ILE*     4.8     8.1    -      -       +      -
    624F  ILE*     4.4    11.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with MET 535 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    531F  SER      2.9    17.6    +      -       -      +
    532F  VAL*     3.5     4.9    -      -       +      +
    534F  GLU*     1.3    76.6    -      -       -      +
    536F  GLU*     1.3    82.4    +      -       -      +
    538F  ARG*     3.4     1.4    +      -       -      +
    539F  TYR*     2.9    50.9    +      -       +      -
    614F  ARG*     4.1    21.3    -      -       +      +
    615F  ILE*     4.0    17.3    -      -       +      -
    618F  LYS*     3.7    31.6    -      -       +      -
    619F  ALA*     3.6    24.5    -      -       +      -
    622F  ALA*     4.1     8.3    -      -       +      -
    624F  ILE*     3.9    15.2    -      -       +      +
----------------------------------------------------------
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Residues in contact with GLU 536 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    501A  MET*     3.5    23.7    -      -       -      +
    532F  VAL*     2.9    25.2    +      -       +      +
    533F  ALA*     3.8     7.0    -      -       -      +
    534F  GLU      3.3     0.2    -      -       -      -
    535F  MET*     1.3    91.8    -      -       -      +
    537F  ARG*     1.3    58.2    +      -       -      +
    539F  TYR*     3.4     3.5    +      -       -      +
    540F  ARG*     2.9    42.1    +      -       -      +
    614F  ARG*     2.8    31.2    +      -       -      +
    618F  LYS*     3.4    14.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 537 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    533F  ALA      3.0    18.4    +      -       -      +
    534F  GLU*     3.3    47.5    +      -       -      +
    536F  GLU*     1.3    76.2    -      -       -      +
    538F  ARG*     1.3    62.4    +      -       -      +
    540F  ARG*     3.4    25.9    +      -       -      +
    541F  LEU*     2.9    53.1    +      -       -      +
    584F  LEU*     5.3     6.5    -      -       -      +
    587F  LEU*     4.6    14.5    -      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 538 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    534F  GLU*     2.8    46.3    +      -       -      +
    535F  MET      3.9     3.1    -      -       -      +
    537F  ARG*     1.3    78.6    -      -       -      +
    539F  TYR*     1.3    59.9    +      -       -      +
    541F  LEU*     3.8     5.4    -      -       -      +
    542F  MET*     2.9    40.3    +      -       +      +
    550F  LEU*     4.1     9.0    -      -       -      +
    587F  LEU*     3.5    31.6    -      -       +      +
    588F  PRO*     2.6    54.0    +      -       -      +
    590F  ILE*     3.9    21.1    -      -       -      +
    622F  ALA*     2.6    47.5    +      -       +      +
    623F  GLY*     4.1     4.9    -      -       -      -
    624F  ILE*     4.4     2.1    -      -       -      +
----------------------------------------------------------
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Residues in contact with TYR 539 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    500A  LYS*     5.4     9.4    +      -       +      +
    501A  MET*     4.1    19.3    -      -       +      +
    502A  LEU*     3.7    42.6    -      -       +      +
    535F  MET*     2.9    34.5    +      -       +      +
    536F  GLU      3.8     4.0    -      -       -      +
    538F  ARG*     1.3    76.2    -      -       -      +
    540F  ARG*     1.3    57.9    +      -       -      +
    542F  MET*     3.6     7.0    +      -       +      +
    543F  ALA*     2.9    29.3    +      -       -      +
    618F  LYS*     2.7    61.8    +      -       +      +
    621F  ALA*     3.4    22.3    +      -       +      +
    622F  ALA*     3.7    22.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with ARG 540 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    501A  MET*     4.0    21.8    -      -       +      -
    533F  ALA      5.1     1.0    +      -       -      -
    536F  GLU*     2.9    27.9    +      -       -      +
    537F  ARG*     3.7    28.1    -      -       -      +
    539F  TYR*     1.3    75.7    -      -       -      +
    541F  LEU*     1.3    58.4    +      -       -      +
    543F  ALA*     3.3     7.2    +      -       -      +
    544F  ALA*     2.9    27.7    +      -       -      +
    570F  PRO*     5.9     0.4    -      -       -      -
    571F  LEU*     4.3    33.0    -      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 541 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    537F  ARG*     2.9    40.6    +      -       -      +
    538F  ARG*     3.8     5.8    -      -       -      +
    539F  TYR      3.3     0.2    -      -       -      -
    540F  ARG*     1.3    77.0    -      -       -      +
    542F  MET*     1.3    59.6    +      -       +      +
    544F  ALA*     3.2     3.9    +      -       -      +
    545F  MET*     3.0    30.6    +      -       -      +
    553F  PHE*     3.5    37.9    -      -       +      -
    570F  PRO*     3.8    26.7    -      -       +      -
    584F  LEU*     3.9    28.9    -      -       +      -
    587F  LEU*     5.2    10.8    -      -       +      -
----------------------------------------------------------
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Residues in contact with MET 542 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    502A  LEU*     4.3     8.7    -      -       +      +
    538F  ARG*     2.9    32.1    +      -       +      +
    539F  TYR*     4.2    10.1    -      -       +      +
    541F  LEU*     1.3    76.6    -      -       +      +
    543F  ALA*     1.3    58.9    -      -       -      +
    545F  MET*     3.8     5.4    -      -       -      +
    546F  GLY*     2.9    22.3    +      -       -      -
    547F  VAL*     3.1    28.6    +      -       +      +
    548F  ARG      4.3     4.9    -      -       -      +
    549F  ASN      4.0    28.3    -      -       -      +
    550F  LEU*     4.1    12.1    -      -       +      -
    553F  PHE*     4.5    21.3    -      -       +      -
    587F  LEU*     6.1     2.5    -      -       +      -
    621F  ALA*     3.5    23.6    -      -       +      +
    622F  ALA*     4.0    13.0    -      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 543 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    501A  MET*     3.3    37.5    -      -       +      +
    502A  LEU*     4.8     2.9    -      -       -      +
    505A  SER*     5.5     6.2    +      -       -      +
    539F  TYR      2.9    19.1    +      -       -      +
    540F  ARG*     3.5     7.6    -      -       -      +
    542F  MET*     1.3    75.9    -      -       -      +
    544F  ALA*     1.3    64.6    +      -       -      +
    546F  GLY*     3.6     9.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 544 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    540F  ARG      2.9    16.5    +      -       -      +
    541F  LEU      3.2     4.7    +      -       -      +
    543F  ALA*     1.3    78.6    -      -       -      +
    545F  MET*     1.3    61.5    +      -       +      +
    546F  GLY      3.7     0.3    +      -       -      -
    570F  PRO*     3.7    26.9    -      -       +      -
    571F  LEU*     6.1     3.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with MET 545 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    541F  LEU*     3.0    20.7    +      -       +      +
    542F  MET*     4.6     3.4    -      -       -      +
    544F  ALA*     1.3    80.2    -      -       +      +
    546F  GLY*     1.3    63.9    +      -       -      +
    547F  VAL*     3.3     8.8    +      -       +      +
    553F  PHE*     3.6    30.3    -      -       +      -
    556F  LYS*     2.6    36.3    +      -       -      +
    557F  VAL*     6.4     0.2    -      -       +      -
    567F  LEU*     3.7    35.4    -      -       +      -
    568F  THR*     3.8    12.8    -      -       +      +
    570F  PRO*     4.9     6.5    -      -       +      -
    584F  LEU*     3.7    27.8    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLY 546 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    502A  LEU*     5.7     0.9    -      -       -      -
    542F  MET      2.9    10.0    +      -       -      -
    543F  ALA*     3.6     6.6    +      -       -      -
    544F  ALA      3.4     3.8    +      -       -      -
    545F  MET*     1.3    76.9    -      -       -      +
    547F  VAL*     1.3    58.5    +      -       -      +
    548F  ARG      4.1     1.2    +      -       -      -
----------------------------------------------------------
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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