Contacts of the helix formed by residues 521 - 547 (chain B) 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 B).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    519B  CYS      4.1     2.7    -      -       -      +
    520B  ILE*     1.3    97.9    -      -       +      +
    522B  LYS*     1.3    66.8    +      -       -      +
    523B  THR*     3.0    18.9    +      -       -      +
    524B  TYR*     3.1    43.3    +      -       +      +
    525B  TRP*     3.0    14.0    -      -       -      -
----------------------------------------------------------
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Residues in contact with LYS 522 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    127B  TYR*     4.0    26.8    +      -       -      -
    219B  GLU*     5.3     4.9    -      -       -      +
    520B  ILE      4.2     0.6    +      -       -      -
    521B  PRO*     1.3    72.0    -      -       -      +
    523B  THR*     1.3    58.7    +      -       -      +
    525B  TRP*     3.4    14.2    +      -       +      +
    526B  ASN*     2.6    53.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with THR 523 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    521B  PRO*     3.0     9.7    -      -       -      +
    522B  LYS*     1.3    80.9    -      -       -      +
    524B  TYR*     1.3    84.0    +      -       +      +
    526B  ASN*     3.0     6.0    +      -       -      +
    527B  LEU*     2.9    45.3    +      -       +      +
----------------------------------------------------------
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Residues in contact with TYR 524 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    509B  MET*     3.6    14.9    -      -       -      +
    520B  ILE*     3.6    23.6    -      -       +      -
    521B  PRO*     3.1    37.0    +      -       +      +
    523B  THR*     1.3    98.3    -      -       +      +
    525B  TRP*     1.3    62.8    +      -       -      +
    527B  LEU*     3.5    13.1    +      -       +      +
    528B  GLY*     2.9    18.0    +      -       -      -
----------------------------------------------------------
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Residues in contact with TRP 525 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    506B  TYR*     4.3    22.3    -      +       +      -
    509B  MET*     3.4    44.9    -      -       +      +
    510B  VAL*     4.1    18.6    -      -       +      -
    513B  ASN*     3.3    47.3    -      -       +      -
    520B  ILE*     3.3    27.7    +      -       +      +
    521B  PRO      3.0    26.9    +      -       -      -
    522B  LYS*     3.4    13.7    -      -       +      +
    523B  THR      3.2     0.2    -      -       -      -
    524B  TYR*     1.3    76.5    -      -       -      +
    526B  ASN*     1.3    68.7    +      -       -      +
    528B  GLY*     2.7    14.4    +      -       -      -
    529B  TYR*     2.9    13.8    +      -       +      +
----------------------------------------------------------
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Residues in contact with ASN 526 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    124B  PHE*     4.1    26.9    -      -       +      -
    128B  ILE*     4.9    14.9    -      -       +      +
    522B  LYS*     2.6    44.5    +      -       -      +
    523B  THR*     3.5     7.1    -      -       -      +
    525B  TRP*     1.3    76.3    -      -       -      +
    527B  LEU*     1.3    67.5    +      -       +      +
    529B  TYR*     2.9    10.3    +      -       -      +
    530B  TRP*     2.9    26.1    +      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 527 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    523B  THR*     2.9    37.7    +      -       +      +
    524B  TYR*     3.7    15.9    -      -       +      +
    526B  ASN*     1.3    79.1    -      -       +      +
    528B  GLY*     1.3    62.4    +      -       -      +
    530B  TRP*     3.2    11.5    +      -       +      +
    531B  LEU*     2.9    34.0    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLY 528 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    502B  THR      4.3     0.3    -      -       -      +
    505B  PRO*     4.9     2.0    -      -       -      -
    506B  TYR*     3.9    20.8    -      -       -      +
    509B  MET*     4.4     6.3    -      -       -      -
    524B  TYR      2.9    10.7    +      -       -      -
    525B  TRP      2.7    14.8    +      -       -      -
    527B  LEU*     1.3    71.6    -      -       -      +
    529B  TYR*     1.3    60.6    +      -       -      -
    531B  LEU*     3.1    14.8    +      -       -      +
    532B  CYS*     3.0    25.7    +      -       -      -
----------------------------------------------------------
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Residues in contact with TYR 529 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    124B  PHE*     4.0    26.5    -      +       +      -
    143B  TRP*     5.0     7.4    -      +       -      -
    144B  LEU*     4.8     6.9    -      -       -      +
    147B  ASP*     3.5     9.8    +      -       -      -
    148B  TYR*     3.3    32.6    +      -       -      -
    506B  TYR*     3.5    39.4    -      +       -      -
    525B  TRP*     2.9    10.9    +      -       +      -
    526B  ASN*     3.1    13.5    -      -       -      +
    528B  GLY*     1.3    74.4    -      -       -      +
    530B  TRP*     1.3    58.0    +      -       -      +
    532B  CYS*     3.0    12.0    +      -       -      +
    533B  TYR*     3.0    65.1    +      +       -      -
   2000B  0HK      3.6    18.8    -      -       -      -
----------------------------------------------------------
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Residues in contact with TRP 530 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     74B  THR*     3.5    39.0    -      -       +      +
     77B  LEU*     4.8    15.0    -      -       +      -
    121B  MET*     3.1    62.6    -      -       +      -
    124B  PHE*     2.9    40.6    -      +       -      -
    125B  THR*     3.4    11.9    -      -       -      -
    128B  ILE*     3.6    13.5    -      -       +      +
    526B  ASN*     2.9    15.8    +      -       +      +
    527B  LEU*     3.2    12.3    +      -       +      +
    529B  TYR*     1.3    73.7    -      -       -      +
    531B  LEU*     1.3    62.4    +      -       +      +
    533B  TYR*     3.0    24.9    +      +       +      +
    534B  ILE*     2.9    34.0    +      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 531 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    502B  THR*     3.2    23.7    -      -       -      +
    505B  PRO*     3.7    31.4    -      -       +      -
    527B  LEU*     2.9    24.5    +      -       +      +
    528B  GLY*     3.1     7.6    +      -       -      +
    530B  TRP*     1.3    72.5    -      -       +      +
    532B  CYS*     1.3    67.8    +      -       -      +
    534B  ILE*     3.0    44.4    +      -       +      +
    535B  ASN      3.0     4.5    +      -       -      -
----------------------------------------------------------
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Residues in contact with CYS 532 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    116B  ILE*     4.7     2.8    -      -       -      +
    502B  THR      3.8     0.4    -      -       -      -
    503B  TRP*     3.2    58.9    +      -       +      +
    506B  TYR*     3.9    18.4    -      -       -      -
    528B  GLY      3.0    18.4    +      -       -      -
    529B  TYR      3.1    10.3    -      -       -      +
    531B  LEU*     1.3    75.9    -      -       -      +
    533B  TYR*     1.3    61.1    +      -       -      +
    535B  ASN*     3.4     8.0    -      -       -      +
    536B  SER*     4.0     6.2    +      -       -      -
   2000B  0HK      3.7    31.8    -      -       -      -
----------------------------------------------------------
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Residues in contact with TYR 533 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    116B  ILE*     3.3    36.8    -      -       +      -
    120B  SER*     3.7    13.2    +      -       -      -
    121B  MET*     3.6    32.1    -      -       +      +
    124B  PHE*     4.0    23.0    -      +       -      +
    143B  TRP*     4.3     4.7    -      -       -      -
    147B  ASP*     2.5    25.5    +      -       -      -
    529B  TYR*     3.0    30.6    +      +       -      -
    530B  TRP*     3.2    35.4    -      +       +      +
    531B  LEU      3.0     0.4    -      -       -      -
    532B  CYS*     1.3    76.6    -      -       -      +
    534B  ILE*     1.3    57.3    +      -       -      +
    535B  ASN      2.9     4.7    -      -       -      -
    536B  SER*     2.8    23.2    +      -       -      -
    537B  THR*     3.0    13.2    +      -       -      -
   2000B  0HK      3.8    16.2    -      -       -      -
----------------------------------------------------------
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Residues in contact with ILE 534 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     77B  LEU*     4.4    26.2    -      -       +      -
    121B  MET*     5.9     0.2    -      -       +      -
    502B  THR*     3.7    13.5    -      -       +      -
    530B  TRP*     2.9    28.0    +      -       +      +
    531B  LEU*     3.0    41.0    +      -       +      +
    533B  TYR*     1.3    69.3    -      -       +      +
    535B  ASN*     1.3    59.8    +      -       -      +
    537B  THR*     3.5    14.7    -      -       +      +
    538B  VAL*     2.9    41.9    +      -       +      +
----------------------------------------------------------
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Residues in contact with ASN 535 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    113B  ASP*     5.2     0.3    -      -       -      +
    154B  SER*     5.1     5.0    +      -       -      -
    498B  ALA*     3.5     5.3    -      -       -      +
    499B  PHE*     3.1    41.6    -      -       -      +
    502B  THR*     2.7    29.3    +      -       -      +
    503B  TRP*     3.7    13.7    +      -       -      +
    531B  LEU      3.0     6.1    +      -       -      -
    532B  CYS      3.4    12.3    -      -       -      +
    533B  TYR      2.9     0.6    -      -       -      -
    534B  ILE*     1.3    79.2    -      -       -      +
    536B  SER*     1.3    60.6    +      -       -      +
    538B  VAL*     3.1     3.6    +      -       -      +
    539B  ASN*     3.0    47.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with SER 536 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     81B  THR*     3.8     7.1    -      -       -      +
    113B  ASP*     2.6    47.8    +      -       -      +
    116B  ILE*     3.6    33.5    -      -       -      +
    121B  MET*     5.6     0.2    -      -       -      -
    154B  SER*     5.6     0.3    +      -       -      -
    503B  TRP*     6.0     1.4    -      -       -      -
    532B  CYS      4.3     3.1    +      -       -      -
    533B  TYR      2.8    13.0    +      -       -      -
    535B  ASN*     1.3    76.6    +      -       -      +
    537B  THR*     1.3    58.8    +      -       -      +
    539B  ASN*     4.2     0.7    -      -       -      +
    540B  PRO*     3.2    22.7    -      -       -      +
----------------------------------------------------------
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Residues in contact with THR 537 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     77B  LEU*     3.5    24.9    +      -       +      +
     80B  VAL*     3.7    26.1    -      -       +      +
     81B  THR*     2.5    29.3    +      -       -      +
    121B  MET*     3.6     9.0    -      -       -      +
    533B  TYR      3.0    12.6    +      -       -      -
    534B  ILE*     3.5    16.4    -      -       -      +
    535B  ASN      3.2     0.2    -      -       -      -
    536B  SER*     1.3    79.4    -      -       -      +
    538B  VAL*     1.3    61.1    +      -       +      +
    540B  PRO*     3.6    10.6    -      -       -      +
    541B  VAL*     4.1    11.8    -      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 538 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    498B  ALA*     4.2    13.9    -      -       +      -
    502B  THR*     5.4     3.6    -      -       +      -
    534B  ILE*     2.9    32.9    +      -       +      +
    535B  ASN*     3.1     5.6    +      -       -      +
    537B  THR*     1.3    79.6    -      -       +      +
    539B  ASN*     1.3    66.7    +      -       -      +
    541B  VAL*     2.8    22.8    +      -       +      +
    542B  CYS*     2.9    29.1    +      -       -      -
----------------------------------------------------------
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Residues in contact with ASN 539 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    109B  LEU*     5.0    11.1    -      -       -      +
    113B  ASP*     3.2    25.6    +      -       -      +
    154B  SER*     5.4     1.4    +      -       -      -
    158B  LEU*     5.9     1.4    -      -       -      +
    495B  ILE*     3.6    39.7    -      -       +      +
    498B  ALA*     4.2     4.3    -      -       -      +
    499B  PHE*     5.9     0.4    -      -       -      +
    535B  ASN*     3.0    42.5    +      -       -      +
    538B  VAL*     1.3    75.9    -      -       -      +
    540B  PRO*     1.3    71.7    -      -       +      +
    542B  CYS*     2.9    14.4    +      -       -      +
    543B  TYR*     2.9    28.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with PRO 540 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     81B  THR*     4.6     2.2    -      -       -      +
     84B  GLY*     3.7    28.7    -      -       -      +
     85B  ASN*     2.8    35.2    -      -       -      +
     88B  VAL*     4.0     4.5    -      -       +      +
    536B  SER      3.2    17.7    -      -       -      +
    537B  THR      3.6     8.1    -      -       -      +
    538B  VAL      3.6     2.9    -      -       -      -
    539B  ASN*     1.3    92.1    -      -       +      +
    541B  VAL*     1.3    60.1    -      -       +      +
    543B  TYR*     3.5    27.3    -      -       +      +
    544B  ALA*     3.8     7.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 541 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     80B  VAL*     5.6     7.6    -      -       +      -
    537B  THR      4.1    13.2    -      -       -      +
    538B  VAL*     2.8    22.1    +      -       +      +
    540B  PRO*     1.3    75.9    -      -       +      +
    542B  CYS*     1.3    63.7    +      -       -      +
    543B  TYR      3.1     2.1    +      -       -      -
    544B  ALA*     3.2     8.2    +      -       -      +
    545B  LEU*     2.9    45.3    +      -       +      +
----------------------------------------------------------
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Residues in contact with CYS 542 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    491B  THR*     5.4     1.8    -      -       -      +
    494B  ALA*     4.1    30.1    -      -       +      -
    495B  ILE*     3.3    29.4    -      -       +      -
    498B  ALA*     4.3     3.1    -      -       -      -
    538B  VAL*     2.9    37.0    +      -       -      -
    539B  ASN*     2.9     3.2    +      -       -      +
    541B  VAL*     1.3    74.6    -      -       -      +
    543B  TYR*     1.3    63.8    +      -       -      +
    545B  LEU*     3.1    17.1    +      -       -      +
    546B  CYS*     2.9    28.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with TYR 543 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     88B  VAL*     3.5    38.6    -      -       +      -
    106B  LEU*     3.0    55.6    +      -       +      +
    109B  LEU*     3.4    20.3    -      -       +      +
    110B  ALA*     3.8     5.6    +      -       +      -
    491B  THR*     5.0     4.7    -      -       +      -
    495B  ILE*     3.7    19.5    -      -       +      -
    539B  ASN*     2.9    19.6    +      -       +      +
    540B  PRO*     3.5    28.0    -      -       +      +
    542B  CYS*     1.3    79.0    -      -       -      +
    544B  ALA*     1.3    64.9    +      -       -      +
    546B  CYS      3.3     0.3    +      -       -      -
    547B  ASN*     3.0    29.1    +      -       -      +
    550B  PHE*     4.0    11.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 544 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    540B  PRO      3.8     7.3    +      -       -      +
    541B  VAL*     3.2     9.9    +      -       -      +
    543B  TYR*     1.3    78.2    -      -       -      +
    545B  LEU*     1.3    64.7    +      -       +      +
    547B  ASN      2.8    18.0    -      -       -      +
    548B  LYS*     4.7     0.2    -      -       -      -
    550B  PHE*     3.6    20.5    -      -       +      +
    551B  ARG*     4.5    16.9    -      -       +      +
    554B  PHE*     5.9     2.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 545 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    494B  ALA*     5.9     3.1    -      -       +      -
    541B  VAL*     2.9    40.4    +      -       +      +
    542B  CYS*     3.2    22.2    -      -       +      +
    543B  TYR      3.0     0.2    +      -       -      -
    544B  ALA*     1.3    81.6    -      -       +      +
    546B  CYS*     1.3    65.3    +      -       +      +
    547B  ASN*     3.2     1.6    +      -       -      -
----------------------------------------------------------
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Residues in contact with CYS 546 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    490B  GLN*     5.2     3.2    -      -       +      +
    491B  THR*     3.2    46.8    +      -       +      +
    493B  SER*     6.1     1.1    -      -       -      -
    494B  ALA*     3.9    24.7    -      -       -      -
    542B  CYS      2.9    14.3    +      -       -      +
    545B  LEU*     1.3    75.2    -      -       -      +
    547B  ASN*     1.3    65.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASN 547 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    103B  ASN*     5.7     1.6    -      -       -      +
    106B  LEU*     5.8     1.4    -      -       -      +
    490B  GLN*     4.3    12.8    +      -       -      +
    491B  THR*     2.6    38.8    +      -       -      +
    543B  TYR*     3.0    13.4    +      -       -      +
    544B  ALA      2.8    18.8    -      -       -      +
    545B  LEU      3.1     1.9    -      -       -      -
    546B  CYS*     1.3    83.8    +      -       -      +
    548B  LYS*     1.3    63.8    +      -       -      +
    549B  THR*     4.2    15.8    +      -       -      +
    550B  PHE*     3.2    18.9    +      -       +      +
    551B  ARG      3.4     3.5    +      -       -      -
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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