Contacts of the helix formed by residues 521 - 547 (chain A) in PDB entry 4DAJ


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

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

Legend:
Dist - nearest distance (Å) between atoms of two residues
Surf - contact surface area (Å2) between two residues
HB   - hydrophilic-hydrophilic contact (hydrogen bond)
Arom - aromatic-aromatic contact
Phob - hydrophobic-hydrophobic contact
DC   - hydrophobic-hydrophilic contact (destabilizing contact)
+/-  - indicates presence/absence of a specific contacts
*    - indicates residues forming contacts  by their side chain
       (including CA atoms)
Residues in contact with PRO 521 (chain A).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    518A  SER      5.6     1.1    -      -       -      +
    519A  CYS      3.5     9.4    -      -       -      +
    520A  ILE*     1.3    88.2    -      -       -      +
    522A  LYS*     1.3    66.3    +      -       -      +
    523A  THR*     3.0    12.7    +      -       -      +
    524A  TYR*     3.1    41.9    +      -       +      +
    525A  TRP*     3.5     6.7    -      -       -      -
----------------------------------------------------------
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Residues in contact with LYS 522 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    127A  TYR*     6.1     0.9    -      -       -      +
    219A  GLU*     2.6    39.5    +      -       -      +
    520A  ILE      4.0     0.8    +      -       -      +
    521A  PRO*     1.3    71.3    -      -       -      +
    523A  THR*     1.3    64.3    +      -       -      +
    525A  TRP*     3.1    18.3    +      -       +      +
    526A  ASN*     3.0    35.0    +      -       -      +
   1051B  GLY      5.4     5.3    +      -       -      -
----------------------------------------------------------
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Residues in contact with THR 523 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    521A  PRO*     3.1     9.2    -      -       -      +
    522A  LYS*     1.3    76.0    -      -       -      +
    524A  TYR*     1.3    80.7    +      -       +      +
    526A  ASN*     2.9    24.0    +      -       -      +
    527A  LEU*     2.9    36.0    +      -       +      +
----------------------------------------------------------
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Residues in contact with TYR 524 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    509A  MET*     3.3    26.1    -      -       -      +
    519A  CYS      5.3     2.5    -      -       -      -
    520A  ILE*     3.8    12.6    -      -       +      -
    521A  PRO*     3.1    36.1    +      -       +      +
    523A  THR*     1.3    93.6    -      -       +      +
    525A  TRP*     1.3    56.7    +      -       -      +
    527A  LEU*     3.3    16.5    +      -       +      +
    528A  GLY      2.9    25.6    +      -       -      -
----------------------------------------------------------
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Residues in contact with TRP 525 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    506A  TYR*     4.1    20.4    -      +       +      -
    509A  MET*     3.7    28.7    -      -       +      -
    510A  VAL*     3.8    26.9    -      -       +      -
    513A  ASN*     3.7    42.5    -      -       +      +
    520A  ILE*     3.4    29.6    +      -       +      +
    521A  PRO      3.5    20.2    -      -       -      -
    522A  LYS*     3.1    21.0    +      -       +      +
    524A  TYR*     1.3    76.4    -      -       -      +
    526A  ASN*     1.3    67.9    +      -       -      +
    528A  GLY*     3.4     1.0    +      -       -      -
    529A  TYR*     2.9    28.9    +      -       +      +
----------------------------------------------------------
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Residues in contact with ASN 526 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    124A  PHE*     3.6    23.3    -      -       +      -
    127A  TYR*     5.4     7.0    -      -       -      -
    128A  ILE*     4.4    24.2    -      -       +      +
    522A  LYS*     3.0    28.3    +      -       -      +
    523A  THR*     2.9    11.1    +      -       -      +
    525A  TRP*     1.3    77.8    -      -       -      +
    527A  LEU*     1.3    60.9    +      -       +      +
    529A  TYR*     3.1     5.5    -      -       -      +
    530A  TRP*     2.9    33.8    +      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 527 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    523A  THR*     2.9    38.1    +      -       +      +
    524A  TYR*     3.5    20.4    -      -       +      +
    525A  TRP      3.2     0.2    -      -       -      -
    526A  ASN*     1.3    78.1    -      -       +      +
    528A  GLY*     1.3    66.0    +      -       -      +
    530A  TRP*     3.0    15.1    +      -       +      +
    531A  LEU*     2.9    27.3    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLY 528 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    502A  THR      4.2     0.2    -      -       -      +
    505A  PRO*     5.3     1.8    -      -       -      -
    506A  TYR*     3.9    19.0    -      -       -      +
    509A  MET*     4.2     6.7    -      -       -      -
    524A  TYR      2.9    13.8    +      -       -      -
    525A  TRP      3.8     2.2    -      -       -      -
    527A  LEU*     1.3    74.1    -      -       -      +
    529A  TYR*     1.3    60.5    +      -       -      +
    531A  LEU*     3.1    15.9    +      -       -      +
    532A  CYS*     2.8    31.5    +      -       -      -
----------------------------------------------------------
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Residues in contact with TYR 529 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    124A  PHE*     3.5    26.2    -      +       +      -
    143A  TRP*     4.4     9.2    -      +       -      -
    144A  LEU*     4.8     7.3    -      -       -      +
    147A  ASP*     4.2     5.4    +      -       -      -
    148A  TYR*     3.3    31.8    +      -       -      -
    506A  TYR*     3.5    29.3    -      +       -      -
    525A  TRP*     2.9    13.8    +      -       +      +
    526A  ASN      3.1    10.8    -      -       -      +
    528A  GLY*     1.3    73.8    -      -       -      +
    530A  TRP*     1.3    64.8    +      -       -      +
    532A  CYS*     2.8    24.9    +      -       -      +
    533A  TYR*     3.0    44.5    +      +       -      -
   2000A  0HK      3.5    31.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with TRP 530 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     74A  THR*     3.4    35.1    -      -       +      +
     77A  LEU*     5.8     1.8    -      -       +      -
    121A  MET*     3.1    46.7    -      -       +      -
    124A  PHE*     3.3    25.1    -      +       -      -
    125A  THR*     3.1    22.0    -      -       -      -
    128A  ILE*     3.3    13.5    -      -       +      +
    526A  ASN*     2.9    26.0    +      -       +      -
    527A  LEU*     3.0    14.3    +      -       +      +
    529A  TYR*     1.3    74.7    -      -       -      +
    531A  LEU*     1.3    56.4    +      -       +      +
    533A  TYR*     2.6    61.1    +      +       +      +
    534A  ILE*     2.9    21.9    +      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 531 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    501A  ILE      4.7     4.3    -      -       -      +
    502A  THR*     3.2    24.5    -      -       +      +
    505A  PRO*     3.8    33.4    -      -       +      -
    527A  LEU      2.9    18.7    +      -       -      +
    528A  GLY*     3.3     9.0    -      -       -      +
    530A  TRP*     1.3    76.7    -      -       +      +
    532A  CYS*     1.3    64.2    +      -       -      +
    534A  ILE*     2.8    38.4    +      -       +      +
    535A  ASN      3.0    10.4    +      -       -      -
----------------------------------------------------------
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Residues in contact with CYS 532 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    116A  ILE*     4.7     2.8    -      -       -      +
    502A  THR      3.7    11.4    -      -       -      -
    503A  TRP*     3.6    19.4    +      -       -      +
    506A  TYR*     3.9    15.9    -      -       -      -
    528A  GLY      2.8    35.9    +      -       -      -
    529A  TYR*     2.8     8.0    +      -       -      +
    531A  LEU*     1.3    73.7    -      -       -      +
    533A  TYR*     1.3    60.7    +      -       -      +
    535A  ASN*     3.5    14.1    -      -       -      +
    536A  SER*     4.2     6.1    +      -       -      -
   2000A  0HK      2.9    55.0    -      -       +      -
----------------------------------------------------------
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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
----------------------------------------------------------
    116A  ILE*     3.6    29.4    -      -       +      -
    120A  SER*     3.5    16.9    +      -       -      -
    121A  MET*     3.9    32.2    -      -       +      +
    124A  PHE*     3.5    25.1    -      +       -      -
    143A  TRP*     3.9     7.1    -      -       -      -
    147A  ASP*     3.0    19.8    +      -       -      -
    529A  TYR*     3.0    32.0    +      +       -      -
    530A  TRP*     2.6    42.5    +      +       +      +
    532A  CYS*     1.3    71.6    -      -       -      +
    534A  ILE*     1.3    50.6    +      -       -      +
    535A  ASN      2.9     5.2    -      -       -      -
    536A  SER*     2.7    31.2    +      -       -      -
    537A  THR*     3.0    10.4    +      -       -      -
   2000A  0HK      4.1    17.0    -      -       -      -
----------------------------------------------------------
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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
----------------------------------------------------------
     77A  LEU*     5.8     6.3    -      -       +      -
    121A  MET*     5.7     2.7    -      -       +      -
    502A  THR*     3.6    17.7    -      -       +      -
    530A  TRP*     3.1    25.1    -      -       +      +
    531A  LEU*     2.8    32.5    +      -       +      +
    533A  TYR*     1.3    67.8    -      -       +      +
    535A  ASN*     1.3    60.6    +      -       -      +
    537A  THR*     3.4    16.6    -      -       +      +
    538A  VAL*     2.8    46.3    +      -       +      +
----------------------------------------------------------
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Residues in contact with ASN 535 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    113A  ASP*     4.3     1.4    -      -       -      +
    154A  SER*     4.5     9.5    +      -       -      -
    158A  LEU*     5.9     0.6    -      -       -      +
    498A  ALA*     3.9     2.5    -      -       -      +
    499A  PHE*     3.3    37.5    -      -       -      +
    502A  THR*     3.0    23.6    -      -       -      +
    503A  TRP*     3.7    15.6    +      -       -      +
    531A  LEU      3.0     6.1    +      -       -      -
    532A  CYS      3.5    12.7    -      -       -      +
    533A  TYR      2.9     0.2    -      -       -      -
    534A  ILE*     1.3    77.0    -      -       -      +
    536A  SER*     1.3    60.8    +      -       -      +
    538A  VAL*     2.8    25.5    +      -       -      +
    539A  ASN*     2.8    49.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with SER 536 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     81A  THR*     3.7    10.1    -      -       -      +
     85A  ASN*     3.7     0.2    +      -       -      -
    113A  ASP*     2.8    53.6    +      -       -      +
    116A  ILE*     3.3    34.5    -      -       -      +
    121A  MET*     5.8     1.1    -      -       -      -
    154A  SER*     5.6     0.3    +      -       -      -
    532A  CYS      4.3     2.4    +      -       -      -
    533A  TYR*     2.7    15.6    +      -       -      -
    535A  ASN*     1.3    79.2    +      -       -      +
    537A  THR*     1.3    57.7    +      -       -      -
    539A  ASN*     3.5     0.2    -      -       -      +
    540A  PRO*     3.4     9.9    -      -       -      +
----------------------------------------------------------
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Residues in contact with THR 537 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     77A  LEU*     3.9    11.5    +      -       +      +
     80A  VAL*     4.1    25.5    -      -       +      +
     81A  THR*     2.5    32.9    +      -       -      +
    121A  MET*     4.0     6.4    -      -       -      +
    533A  TYR      3.0     5.1    +      -       -      -
    534A  ILE*     3.4    24.0    -      -       +      +
    535A  ASN      3.0     0.6    -      -       -      -
    536A  SER*     1.3    77.8    -      -       -      +
    538A  VAL*     1.3    62.0    +      -       +      +
    540A  PRO*     3.2    18.0    -      -       -      +
    541A  VAL*     3.6    12.6    -      -       +      +
----------------------------------------------------------
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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
----------------------------------------------------------
    498A  ALA*     4.2    14.6    -      -       +      -
    502A  THR*     5.6     2.5    -      -       +      -
    534A  ILE*     2.8    38.4    +      -       +      +
    535A  ASN*     2.8    10.9    +      -       -      +
    537A  THR*     1.3    78.1    -      -       +      +
    539A  ASN*     1.3    57.3    +      -       -      +
    540A  PRO      3.5     0.2    -      -       -      -
    541A  VAL*     3.1    18.3    -      -       +      +
    542A  CYS*     2.9    42.9    +      -       -      -
----------------------------------------------------------
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Residues in contact with ASN 539 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    109A  LEU*     5.6     7.4    -      -       +      +
    110A  ALA*     6.3     0.2    -      -       -      -
    113A  ASP*     3.2    28.1    +      -       -      +
    154A  SER*     5.5     1.0    +      -       -      -
    495A  ILE*     3.8    35.7    -      -       +      +
    498A  ALA*     4.5     3.3    -      -       -      +
    535A  ASN*     2.8    57.1    +      -       -      +
    536A  SER*     3.5     0.6    -      -       -      +
    538A  VAL*     1.3    73.5    -      -       -      +
    540A  PRO*     1.3    67.0    -      -       +      +
    542A  CYS*     3.3     4.5    +      -       -      +
    543A  TYR*     2.9    37.6    +      -       +      +
----------------------------------------------------------
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Residues in contact with PRO 540 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     81A  THR      5.0     0.7    -      -       -      +
     84A  GLY*     4.0    14.4    -      -       -      +
     85A  ASN*     2.8    37.0    -      -       -      +
     88A  VAL*     3.8    16.6    -      -       +      -
    110A  ALA*     5.4     1.1    -      -       +      -
    113A  ASP*     4.1     0.2    -      -       -      +
    536A  SER      3.4     8.3    -      -       -      +
    537A  THR      3.2    16.6    -      -       -      +
    539A  ASN*     1.3    95.0    -      -       +      +
    541A  VAL*     1.3    62.9    +      -       +      +
    543A  TYR*     2.9    27.1    +      -       +      +
    544A  ALA*     2.9    15.7    +      -       -      +
    554A  PHE*     4.8     5.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with VAL 541 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     80A  VAL*     5.8     5.6    -      -       +      -
    537A  THR*     3.6    22.2    -      -       +      +
    538A  VAL*     3.1    20.4    +      -       +      +
    540A  PRO*     1.3    77.3    -      -       +      +
    542A  CYS*     1.3    57.6    +      -       -      +
    544A  ALA*     3.5     4.4    +      -       -      +
    545A  LEU*     2.9    57.3    +      -       +      +
----------------------------------------------------------
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Residues in contact with CYS 542 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    491A  THR*     4.7     0.9    -      -       -      -
    494A  ALA*     3.7    25.8    -      -       +      -
    495A  ILE*     3.6    15.3    -      -       +      -
    498A  ALA*     4.3    14.1    -      -       -      -
    538A  VAL*     2.9    44.1    +      -       -      -
    539A  ASN*     3.6     7.4    -      -       -      +
    541A  VAL*     1.3    74.0    -      -       -      +
    543A  TYR*     1.3    67.9    +      -       -      +
    545A  LEU*     4.5     6.3    -      -       -      -
    546A  CYS*     2.9    30.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with TYR 543 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     88A  VAL*     3.9    31.0    -      -       +      -
    106A  LEU*     2.7    78.1    +      -       +      +
    109A  LEU*     3.1    20.4    -      -       +      +
    110A  ALA*     4.3     6.3    -      -       +      -
    491A  THR*     4.3     7.0    -      -       +      -
    495A  ILE*     3.6    23.1    -      -       +      -
    539A  ASN*     2.9    25.0    +      -       +      -
    540A  PRO*     2.9    12.7    +      -       +      +
    542A  CYS*     1.3    79.2    -      -       -      +
    544A  ALA*     1.3    65.1    +      -       -      +
    546A  CYS*     3.8     1.2    -      -       -      +
    547A  ASN*     3.0    24.8    +      -       -      +
    550A  PHE*     4.1    21.4    -      +       +      -
    554A  PHE*     5.4     1.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 544 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    540A  PRO      2.9     9.7    +      -       -      +
    541A  VAL*     4.0     4.3    -      -       -      +
    543A  TYR*     1.3    76.7    -      -       -      +
    545A  LEU*     1.3    66.2    +      -       +      +
    547A  ASN      2.6    22.3    -      -       -      +
    550A  PHE*     3.7    13.2    -      -       +      -
    551A  ARG*     3.1    19.1    -      -       +      +
    554A  PHE*     3.6    31.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 545 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    541A  VAL*     2.9    47.1    +      -       +      +
    542A  CYS*     4.1     5.4    -      -       -      +
    544A  ALA*     1.3    80.7    -      -       +      +
    546A  CYS*     1.3    61.8    +      -       -      +
    551A  ARG*     2.8    34.6    +      -       +      +
----------------------------------------------------------
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Residues in contact with CYS 546 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    491A  THR*     3.1    35.7    -      -       -      +
    494A  ALA*     3.7    26.2    -      -       -      -
    542A  CYS*     2.9    24.7    +      -       -      +
    543A  TYR      3.8     1.3    -      -       -      +
    545A  LEU*     1.3    82.3    -      -       -      +
    547A  ASN*     1.3    62.7    +      -       -      +
    548A  LYS*     3.8     3.6    +      -       -      +
    551A  ARG*     4.9     1.6    +      -       -      -
----------------------------------------------------------
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Residues in contact with ASN 547 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    103A  ASN*     4.7     8.1    +      -       -      +
    106A  LEU*     5.7     3.0    -      -       -      +
    490A  GLN*     3.3    20.8    +      -       -      +
    491A  THR*     3.2    20.7    +      -       -      -
    543A  TYR      3.0     6.3    +      -       -      -
    544A  ALA      2.6    20.8    -      -       -      +
    546A  CYS*     1.3    76.6    -      -       -      +
    548A  LYS*     1.3    64.8    +      -       -      +
    549A  THR*     3.1    12.9    +      -       -      +
    550A  PHE*     3.2    47.1    +      -       +      +
    551A  ARG*     3.3     3.0    +      -       -      -
----------------------------------------------------------
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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