Contacts of the helix formed by residues 535 - 558 (chain B) in PDB entry 2O2C


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 THR 535 (chain B).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     95B  ASP*     3.9    16.7    +      -       -      +
     97B  ASN*     3.1    16.4    +      -       -      +
    219B  LEU*     3.9     5.8    -      -       -      +
    222B  PHE*     3.8    12.6    -      -       +      -
    348B  GLU*     6.0     0.4    -      -       -      -
    466B  GLN*     4.8     2.5    -      -       -      +
    533B  SER*     3.1    25.1    +      -       -      +
    534B  LEU*     1.3    75.8    -      -       -      +
    536B  PRO*     1.4    75.2    -      -       -      +
    537B  ARG*     3.6     9.4    +      -       -      +
    538B  ALA*     3.1    20.5    +      -       -      +
    539B  LEU*     3.1     9.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with PRO 536 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    219B  LEU*     3.7    30.1    -      -       +      -
    222B  PHE*     3.9    28.3    -      -       +      -
    341B  ILE*     4.6     0.2    -      -       +      -
    345B  ASN*     3.3    48.7    -      -       +      +
    348B  GLU*     4.0     7.9    -      -       +      -
    349B  LEU*     3.4    17.2    -      -       -      +
    535B  THR*     1.4    85.0    -      -       -      +
    537B  ARG*     1.3    61.4    +      -       -      +
    539B  LEU*     3.3     1.9    +      -       -      +
    540B  GLY      3.1    17.8    +      -       -      -
----------------------------------------------------------
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Residues in contact with ARG 537 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     91B  LEU*     2.8    47.9    +      -       +      -
     92B  GLY*     3.6    15.4    +      -       -      -
     93B  SER*     3.7    25.3    -      -       -      +
     97B  ASN*     5.6     0.7    -      -       -      +
    348B  GLU*     2.8    60.7    +      -       -      +
    351B  THR*     3.6    29.2    +      -       -      +
    352B  GLY*     3.2    27.6    -      -       -      -
    355B  VAL*     4.5     1.8    -      -       -      +
    535B  THR*     3.1     8.6    +      -       -      +
    536B  PRO*     1.3    79.7    -      -       -      +
    538B  ALA*     1.3    60.4    +      -       -      +
    540B  GLY      3.3     0.5    +      -       -      -
    541B  ALA*     3.1    19.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 538 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     91B  LEU*     3.8    14.3    -      -       +      +
     97B  ASN*     3.7     8.3    -      -       -      +
    531B  ILE*     4.0    19.2    -      -       +      +
    533B  SER      3.3    26.2    -      -       -      +
    534B  LEU*     4.2     0.4    -      -       -      -
    535B  THR*     3.1    13.9    +      -       -      +
    537B  ARG*     1.3    75.1    -      -       -      +
    539B  LEU*     1.3    66.1    +      -       -      +
    541B  ALA*     3.3     2.8    +      -       -      +
    542B  ILE*     3.0    29.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 539 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    214B  MET*     3.9    16.4    -      -       +      -
    215B  ALA*     4.0    17.7    -      -       +      -
    218B  ALA*     3.9    19.1    -      -       +      -
    219B  LEU*     3.9    23.1    -      -       +      -
    329B  MET*     4.8     0.4    -      -       +      -
    349B  LEU*     4.0    10.5    -      -       +      -
    398B  LEU*     3.8    28.0    -      -       +      -
    401B  LEU*     5.1     0.4    -      -       +      -
    534B  LEU*     4.1    12.9    -      -       +      +
    535B  THR      3.1    11.2    +      -       -      +
    536B  PRO      3.3     7.2    +      -       -      +
    538B  ALA*     1.3    73.5    -      -       -      +
    540B  GLY*     1.3    66.5    +      -       -      +
    542B  ILE*     3.2     8.5    +      -       +      +
    543B  ILE*     3.0    42.0    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLY 540 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    330B  TRP*     3.6    14.2    -      -       -      -
    349B  LEU*     3.4    28.2    -      -       -      +
    353B  ALA*     3.5    11.2    -      -       -      +
    536B  PRO      3.1    10.9    +      -       -      -
    537B  ARG      3.3     2.0    +      -       -      -
    538B  ALA      3.3     0.2    -      -       -      -
    539B  LEU*     1.3    75.5    -      -       -      +
    541B  ALA*     1.3    56.5    +      -       -      +
    544B  ALA*     3.1    31.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 541 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     91B  LEU*     3.6    29.4    -      -       +      -
     99B  LEU*     4.0    10.8    -      -       +      -
    352B  GLY      3.5    12.2    -      -       -      +
    356B  ILE*     3.6    16.9    -      -       +      +
    531B  ILE*     6.4     0.4    -      -       +      -
    537B  ARG      3.1    13.1    +      -       -      +
    538B  ALA*     3.4    10.3    -      -       -      +
    540B  GLY*     1.3    76.7    -      -       -      +
    542B  ILE*     1.3    57.6    +      -       +      +
    544B  ALA*     3.9     0.2    -      -       -      +
    545B  MET*     3.0    29.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 542 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     99B  LEU*     4.2    20.9    -      -       +      -
    398B  LEU*     5.0     4.5    -      -       +      -
    401B  LEU*     4.5    17.7    -      -       +      -
    460B  ILE*     4.2    22.7    -      -       +      -
    529B  LEU*     6.1     0.4    -      -       +      -
    531B  ILE*     4.0    28.7    -      -       +      -
    534B  LEU*     4.3    11.4    -      -       +      -
    538B  ALA      3.0    19.2    +      -       -      +
    539B  LEU*     3.2    10.5    +      -       +      +
    541B  ALA*     1.3    73.2    -      -       -      +
    543B  ILE*     1.3    71.2    +      -       +      +
    545B  MET*     3.3     9.6    +      -       +      +
    546B  TYR*     3.2    42.8    +      -       +      -
----------------------------------------------------------
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Residues in contact with ILE 543 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    214B  MET*     3.7    25.6    -      -       +      -
    329B  MET*     4.1     4.5    -      -       -      -
    330B  TRP*     3.5    27.1    -      -       +      -
    401B  LEU*     3.6    31.0    -      -       +      -
    404B  TYR*     3.6    33.0    -      -       +      +
    405B  LEU*     4.8     3.1    -      -       +      -
    408B  LEU*     5.0     0.9    -      -       +      -
    539B  LEU*     3.0    25.8    +      -       +      +
    542B  ILE*     1.3    77.6    -      -       +      +
    544B  ALA*     1.3    57.9    +      -       -      +
    546B  TYR*     3.1     7.9    +      -       -      +
    547B  GLU*     2.9    33.3    +      -       +      +
----------------------------------------------------------
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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
----------------------------------------------------------
    152B  ARG*     3.9    12.3    -      -       -      +
    330B  TRP*     4.4     0.8    -      -       -      -
    353B  ALA*     3.7    29.2    -      -       +      +
    356B  ILE*     4.0    10.5    -      -       +      -
    357B  ASP*     4.1     1.6    -      -       -      +
    540B  GLY      3.1    19.0    +      -       -      +
    541B  ALA      3.9     2.9    -      -       -      +
    543B  ILE*     1.3    76.2    -      -       -      +
    545B  MET*     1.3    62.8    +      -       -      +
    547B  GLU*     3.3    12.0    +      -       -      +
    548B  HIS*     3.0    30.1    +      -       -      -
----------------------------------------------------------
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Residues in contact with MET 545 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     99B  LEU*     4.0    13.2    -      -       +      -
    356B  ILE*     3.8    13.4    -      -       +      +
    369B  VAL*     3.6    28.0    -      -       +      -
    370B  PRO*     3.7    15.3    -      -       +      +
    373B  LEU*     3.8    17.9    -      -       +      -
    529B  LEU*     3.6    39.0    -      -       +      -
    541B  ALA      3.0    19.0    +      -       -      +
    542B  ILE*     3.4    10.5    -      -       +      +
    544B  ALA*     1.3    76.5    -      -       -      +
    546B  TYR*     1.3    91.0    +      -       +      +
    548B  HIS      3.3     1.4    +      -       -      -
    549B  LYS*     2.9    26.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with TYR 546 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    373B  LEU*     4.1    10.1    -      -       +      -
    391B  ILE*     3.7    13.2    -      -       +      +
    405B  LEU*     3.7    45.8    -      -       +      -
    408B  LEU*     4.0     5.4    -      -       +      -
    409B  ASP*     6.1     0.9    -      -       -      -
    458B  ASP*     2.7    41.0    +      -       -      +
    460B  ILE*     3.7    17.0    -      -       +      +
    529B  LEU*     3.5     8.7    -      -       -      +
    542B  ILE*     3.2    26.1    +      -       +      -
    543B  ILE      3.1     8.1    +      -       -      +
    545B  MET*     1.3    95.7    -      -       +      +
    547B  GLU*     1.3    64.7    +      -       -      +
    549B  LYS*     3.3    23.9    +      -       +      +
    550B  VAL*     3.0    30.3    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLU 547 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    148B  HIS*     3.4     8.8    +      -       -      +
    152B  ARG*     2.7    35.9    +      -       -      -
    326B  ARG      4.6     0.3    -      -       -      +
    327B  TYR*     3.6    45.5    +      -       +      -
    330B  TRP*     2.9    24.7    +      -       -      -
    404B  TYR*     4.3     3.1    +      -       -      -
    408B  LEU*     3.9    15.9    -      -       +      -
    543B  ILE*     2.9    28.0    +      -       +      +
    544B  ALA*     3.3     7.6    +      -       -      +
    546B  TYR*     1.3    76.2    -      -       -      +
    548B  HIS*     1.3    62.0    +      -       -      +
    550B  VAL*     3.5     4.6    +      -       -      +
    551B  LEU*     3.1    24.4    +      -       -      +
    562B  TYR*     4.9     0.9    +      -       -      -
----------------------------------------------------------
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Residues in contact with HIS 548 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    133B  PHE*     4.0    11.9    -      +       -      -
    148B  HIS*     4.7     7.4    +      -       -      -
    149B  ILE*     3.8    19.7    -      -       +      -
    152B  ARG*     3.7     7.7    +      -       -      -
    356B  ILE*     4.3     8.3    -      -       +      -
    357B  ASP*     2.7    34.0    +      -       -      -
    360B  PHE*     3.5    37.4    -      +       +      -
    370B  PRO*     3.6    20.2    -      -       +      -
    544B  ALA      3.0    20.9    +      -       -      +
    547B  GLU*     1.3    79.1    -      -       -      +
    549B  LYS*     1.3    61.2    +      -       -      +
    551B  LEU*     3.3    13.4    +      -       +      +
    552B  VAL*     3.1    28.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 549 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    370B  PRO*     3.7    15.6    -      -       -      +
    373B  LEU*     3.9    29.8    -      -       +      +
    374B  ALA*     3.5    20.4    -      -       -      +
    377B  GLY*     5.2     2.5    -      -       -      -
    389B  HIS*     3.6    35.4    +      -       -      -
    409B  ASP*     4.3    14.8    +      -       -      +
    430B  PRO*     6.1     1.4    -      -       -      +
    458B  ASP*     4.6     3.6    +      -       -      -
    545B  MET      2.9    17.2    +      -       -      +
    546B  TYR*     3.3    25.3    +      -       +      +
    548B  HIS*     1.3    74.8    -      -       -      +
    550B  VAL*     1.3    64.9    +      -       +      +
    552B  VAL      3.3     1.7    +      -       -      -
    553B  GLN*     3.1    51.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 550 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    327B  TYR*     3.7    13.7    -      -       -      +
    408B  LEU*     4.0    11.2    -      -       +      +
    409B  ASP*     4.0    34.1    -      -       +      +
    412B  SER*     3.5    31.9    -      -       -      +
    413B  ASN*     3.1    21.4    +      -       -      +
    546B  TYR*     3.0    19.5    +      -       +      +
    547B  GLU*     3.6     6.3    -      -       -      +
    549B  LYS*     1.3    78.6    -      -       +      +
    551B  LEU*     1.3    62.4    +      -       -      +
    553B  GLN*     3.5     2.9    +      -       -      +
    554B  GLY*     3.0    20.8    +      -       -      -
    561B  SER*     3.8     4.4    +      -       -      -
----------------------------------------------------------
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Residues in contact with LEU 551 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    125B  ILE*     5.3     0.9    -      -       +      -
    128B  PHE*     3.7    30.2    -      -       +      -
    129B  VAL*     4.0    21.1    -      -       +      -
    132B  VAL*     4.2    24.2    -      -       +      -
    133B  PHE*     5.0     2.7    -      -       +      -
    148B  HIS*     5.7     3.8    -      -       +      +
    360B  PHE*     4.1    20.2    -      -       +      -
    547B  GLU      3.1    13.1    +      -       -      +
    548B  HIS*     3.4    21.1    -      -       +      +
    550B  VAL*     1.3    76.8    -      -       -      +
    552B  VAL*     1.3    61.1    +      -       +      +
    554B  GLY*     3.4     1.0    +      -       -      -
    555B  ALA*     3.0    30.5    +      -       +      +
    561B  SER*     4.6     3.2    +      -       -      -
    562B  TYR*     3.2    28.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 552 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    125B  ILE*     4.1    18.6    -      -       +      -
    360B  PHE*     3.6    28.7    -      -       +      -
    371B  LEU*     3.7    31.2    -      -       +      +
    374B  ALA*     3.7    21.5    -      -       +      -
    375B  LEU*     4.9     0.4    -      -       +      -
    548B  HIS      3.1    15.8    +      -       -      +
    551B  LEU*     1.3    79.0    -      -       +      +
    553B  GLN*     1.3    56.8    +      -       -      +
    555B  ALA*     3.2     5.6    +      -       -      +
    556B  ILE*     2.9    45.0    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLN 553 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    374B  ALA*     3.1    30.8    +      -       +      +
    377B  GLY*     3.6    23.6    -      -       -      -
    378B  VAL*     3.8     6.4    -      -       +      +
    381B  ILE*     4.2     7.0    -      -       -      +
    409B  ASP*     4.4    10.7    -      -       -      +
    413B  ASN*     3.9    10.6    +      -       -      +
    430B  PRO*     4.9     1.9    -      -       -      +
    549B  LYS*     3.1    44.7    +      -       -      +
    550B  VAL*     4.9     1.6    -      -       -      -
    552B  VAL*     1.3    73.7    -      -       -      +
    554B  GLY*     1.3    63.6    +      -       -      +
    556B  ILE*     3.3     9.0    +      -       -      +
    557B  TRP*     3.0    58.3    +      -       +      -
----------------------------------------------------------
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Residues in contact with GLY 554 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    128B  PHE*     6.3     0.2    -      -       -      -
    413B  ASN*     3.8     5.5    -      -       -      +
    550B  VAL      3.0    11.8    +      -       -      -
    551B  LEU      3.8     0.2    -      -       -      -
    553B  GLN*     1.3    76.2    -      -       -      +
    555B  ALA*     1.3    56.7    +      -       -      +
    557B  TRP      3.5     0.5    +      -       -      -
    558B  GLY      3.0    21.7    +      -       -      -
    559B  ILE*     3.0    33.1    +      -       -      +
    561B  SER*     3.3    23.6    -      -       -      -
----------------------------------------------------------
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Residues in contact with ALA 555 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    123B  ARG*     3.9    12.7    +      -       -      +
    125B  ILE*     3.5    25.0    -      -       +      +
    128B  PHE*     3.7    35.4    -      -       +      -
    551B  LEU*     3.0    17.3    +      -       +      +
    552B  VAL*     3.2     1.5    +      -       -      +
    554B  GLY*     1.3    74.0    -      -       -      +
    556B  ILE*     1.3    65.4    +      -       -      +
    558B  GLY*     3.3    12.3    +      -       -      +
    559B  ILE      5.1     1.6    -      -       -      -
----------------------------------------------------------
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Residues in contact with ILE 556 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     50B  LEU*     3.3    16.8    -      -       +      +
     56B  TRP*     4.7     0.7    -      -       +      -
    119B  LEU*     4.1    24.9    -      -       +      -
    120B  ALA*     5.2     1.8    -      -       -      -
    123B  ARG*     2.9    37.6    +      -       +      +
    125B  ILE*     4.0    15.0    -      -       +      -
    374B  ALA      5.3     0.9    -      -       -      +
    375B  LEU*     3.5    32.3    -      -       +      -
    378B  VAL*     4.0    27.4    -      -       +      -
    552B  VAL*     2.9    32.0    +      -       +      +
    553B  GLN*     3.3     5.1    +      -       -      +
    555B  ALA*     1.3    75.2    -      -       -      +
    557B  TRP*     1.3    63.9    +      -       +      +
----------------------------------------------------------
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Residues in contact with TRP 557 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     47B  ASP*     4.6     3.3    -      -       -      +
     50B  LEU*     3.9    16.4    -      -       +      +
    123B  ARG*     3.7     4.6    +      -       -      -
    378B  VAL*     4.1    16.0    -      -       +      +
    381B  ILE*     3.8    24.7    -      -       +      -
    382B  ASN*     2.9    27.5    +      -       -      -
    413B  ASN*     3.9    10.3    -      -       +      -
    418B  THR*     4.1    13.0    -      -       -      +
    424B  VAL*     4.5     4.6    -      -       +      +
    426B  THR*     3.6    18.7    +      -       -      +
    427B  LEU      3.5     8.9    +      -       -      -
    428B  THR*     3.4    44.4    -      -       +      -
    429B  GLY*     3.4    20.2    -      -       -      -
    553B  GLN*     3.0    44.1    +      -       +      +
    554B  GLY      4.0     2.9    -      -       -      +
    556B  ILE*     1.3    79.7    -      -       +      +
    558B  GLY*     1.3    61.7    +      -       -      +
    559B  ILE*     3.6    17.2    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLY 558 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    123B  ARG*     3.5    14.4    -      -       -      -
    418B  THR*     3.3     9.6    -      -       -      -
    419B  ARG*     2.9    30.9    +      -       -      +
    554B  GLY      3.0     6.2    +      -       -      -
    555B  ALA*     3.3     6.4    +      -       -      -
    556B  ILE      3.2     4.0    -      -       -      -
    557B  TRP*     1.3    78.5    -      -       -      +
    559B  ILE*     1.3    61.0    +      -       -      +
----------------------------------------------------------
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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