Contacts of the helix formed by residues 316 - 341 (chain B) in PDB entry 4OIV


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

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

Legend:
Dist - nearest distance (Å) between atoms of two residues
Surf - contact surface area (Å2) between two residues
HB   - hydrophilic-hydrophilic contact (hydrogen bond)
Arom - aromatic-aromatic contact
Phob - hydrophobic-hydrophobic contact
DC   - hydrophobic-hydrophilic contact (destabilizing contact)
+/-  - indicates presence/absence of a specific contacts
*    - indicates residues forming contacts  by their side chain
       (including CA atoms)
Residues in contact with ASP 316 (chain B).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    314B  THR      3.9     1.4    +      -       -      -
    315B  LEU*     1.3    74.4    -      -       -      +
    317B  HIS*     1.3    59.2    +      -       -      +
    318B  GLU*     3.0    21.2    +      -       -      +
    319B  ASP*     3.0    27.2    +      -       -      +
    320B  GLN*     2.9    25.3    +      -       -      +
    403B  LYS*     2.9    36.9    +      -       -      -
    404B  ASP*     5.9     2.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with HIS 317 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    469A  LEU*     4.0    20.0    -      -       +      -
    470A  GLU*     2.9    30.4    +      -       +      -
    315B  LEU      3.4     2.0    +      -       -      -
    316B  ASP*     1.3    70.6    +      -       -      +
    318B  GLU*     1.3    68.9    +      -       +      +
    320B  GLN*     3.4    22.3    +      -       -      +
    321B  ILE*     3.1    33.7    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLU 318 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    316B  ASP*     3.0     8.7    +      -       -      +
    317B  HIS*     1.3    84.2    -      -       +      +
    319B  ASP*     1.3    61.5    +      -       -      +
    321B  ILE*     3.4    13.0    +      -       +      +
    322B  ALA*     3.1    23.0    +      -       -      +
    401B  TYR      5.1     1.0    -      -       -      +
    403B  LYS*     2.9    30.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASP 319 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    315B  LEU*     5.1     8.5    -      -       +      -
    316B  ASP*     3.0    30.9    +      -       +      +
    318B  GLU*     1.3    74.3    -      -       -      +
    320B  GLN*     1.3    62.3    +      -       -      +
    322B  ALA*     3.2     4.4    +      -       -      +
    323B  LEU*     2.8    34.3    +      -       -      +
    401B  TYR      3.9     2.4    -      -       -      +
    402B  ILE*     3.6    19.2    -      -       +      +
    403B  LYS*     2.8    38.3    +      -       -      +
    404B  ASP*     3.0    32.6    +      -       -      +
    408B  VAL*     5.6     2.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLN 320 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    469A  LEU*     3.6    16.8    -      -       +      +
    312B  PHE*     3.4    59.9    +      -       +      +
    313B  GLN*     3.9    25.0    +      -       -      +
    315B  LEU*     2.8    29.2    +      -       +      +
    316B  ASP      2.9    12.9    +      -       -      +
    317B  HIS*     3.6    23.3    +      -       -      +
    319B  ASP*     1.3    76.8    -      -       -      +
    321B  ILE*     1.3    63.1    +      -       -      +
    323B  LEU*     3.7     0.6    -      -       -      +
    324B  LEU*     3.1    25.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 321 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    467A  PRO*     3.7    31.2    -      -       +      -
    469A  LEU*     3.9    28.8    +      -       +      +
    470A  GLU*     3.7    22.9    -      -       -      +
    317B  HIS*     3.1    25.4    +      -       +      +
    318B  GLU*     3.6    14.1    -      -       +      +
    320B  GLN*     1.3    80.7    -      -       -      +
    322B  ALA*     1.4    58.6    +      -       -      +
    324B  LEU*     3.4     1.7    +      -       -      +
    325B  LYS*     2.9    35.9    +      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 322 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    318B  GLU      3.1    16.6    +      -       -      +
    319B  ASP*     3.2     0.4    +      -       -      -
    321B  ILE*     1.4    79.8    -      -       +      +
    323B  LEU*     1.3    57.8    +      -       -      +
    325B  LYS*     3.4    11.6    +      -       -      +
    326B  GLY*     2.9    26.0    +      -       -      -
    399B  ARG*     4.4     1.4    -      -       -      +
    400B  GLN      3.9    13.5    -      -       -      +
    401B  TYR*     3.6    24.5    -      -       +      +
    402B  ILE*     3.6    20.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 323 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    312B  PHE*     3.9    14.8    -      -       +      -
    315B  LEU*     3.8    28.5    -      -       +      -
    319B  ASP      2.8    19.6    +      -       -      +
    320B  GLN      3.7     4.3    -      -       -      +
    321B  ILE      3.3     0.2    -      -       -      -
    322B  ALA*     1.3    68.9    -      -       -      +
    324B  LEU*     1.3    67.2    +      -       -      +
    326B  GLY*     3.3     1.0    +      -       -      -
    327B  SER*     3.0    30.9    +      -       -      -
    394B  ILE*     3.5    19.5    -      -       +      +
    395B  LEU*     3.9    18.4    -      -       +      -
    396B  SER      3.2    29.8    -      -       -      +
    399B  ARG*     3.8    12.7    -      -       +      +
    402B  ILE*     3.8    13.4    -      -       +      +
    408B  VAL*     4.1    15.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 324 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    468A  LEU*     3.9    22.9    -      -       +      -
    469A  LEU*     3.6    47.6    -      -       +      +
    302B  LEU*     4.6    13.0    -      -       +      -
    303B  VAL*     4.1    15.7    -      -       +      -
    306B  THR*     3.9    33.7    -      -       +      +
    320B  GLN      3.1    14.0    +      -       -      +
    321B  ILE*     4.0     2.7    -      -       -      +
    323B  LEU*     1.3    77.2    -      -       -      +
    325B  LYS*     1.3    67.1    +      -       -      +
    327B  SER*     4.7     2.9    -      -       -      -
    328B  ALA*     2.9    36.0    +      -       +      +
    394B  ILE*     5.5     4.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with LYS 325 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    467A  PRO*     6.5     0.7    -      -       +      -
    468A  LEU*     5.4     5.8    -      -       -      +
    321B  ILE*     2.9    25.5    +      -       +      +
    322B  ALA*     3.6    11.0    -      -       -      +
    324B  LEU*     1.3    79.9    -      -       -      +
    326B  GLY*     1.3    61.7    +      -       -      +
    328B  ALA*     3.8    10.4    +      -       -      +
    329B  VAL      5.0     0.3    +      -       -      -
    401B  TYR*     3.9    36.4    -      -       -      -
    453B  GLU*     4.2    19.3    -      -       -      +
----------------------------------------------------------
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Residues in contact with GLY 326 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    322B  ALA      2.9    19.2    +      -       -      -
    323B  LEU      3.8     1.6    -      -       -      -
    325B  LYS*     1.3    75.0    -      -       -      +
    327B  SER*     1.4    58.7    +      -       -      +
    328B  ALA      3.6     0.2    -      -       -      -
    329B  VAL*     5.2     1.4    +      -       -      +
    330B  GLU*     4.6     4.5    +      -       -      +
    399B  ARG*     3.4    35.1    +      -       -      -
    400B  GLN      5.6     2.5    -      -       -      -
    449B  HIS*     5.7     3.3    -      -       -      -
    453B  GLU*     5.9     0.7    -      -       -      -
----------------------------------------------------------
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Residues in contact with SER 327 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    323B  LEU      3.0    14.9    +      -       -      -
    324B  LEU*     4.2     2.5    -      -       -      -
    326B  GLY*     1.4    76.4    -      -       -      +
    328B  ALA*     1.3    66.1    +      -       -      +
    329B  VAL      3.3     2.4    +      -       -      -
    330B  GLU*     3.3     5.7    +      -       -      +
    331B  ALA*     3.0    22.8    +      -       -      +
    393B  VAL*     3.2     5.6    +      -       -      +
    394B  ILE*     2.9    44.9    +      -       -      -
    399B  ARG*     2.8    27.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 328 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    468A  LEU*     3.7    26.0    -      -       +      -
    302B  LEU*     3.8    17.3    -      -       +      +
    324B  LEU*     2.9    19.8    +      -       +      +
    325B  LYS*     3.8     6.4    +      -       -      +
    326B  GLY      3.6     1.2    -      -       -      -
    327B  SER*     1.3    76.7    -      -       -      +
    329B  VAL*     1.3    65.2    +      -       +      +
    331B  ALA      3.8     0.2    -      -       -      -
    332B  MET*     2.8    28.1    +      -       -      +
    453B  GLU*     6.0     1.1    -      -       -      +
    456B  MET*     3.6    14.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with VAL 329 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    325B  LYS      5.0     1.2    +      -       -      -
    326B  GLY      5.2     1.7    +      -       -      +
    327B  SER      3.4     0.8    -      -       -      -
    328B  ALA*     1.3    76.0    -      -       -      +
    330B  GLU*     1.3    59.5    +      -       -      +
    332B  MET*     3.2     4.3    +      -       -      +
    333B  PHE*     2.8    47.7    +      -       +      -
    449B  HIS*     3.9    25.8    -      -       +      +
    452B  ALA*     3.5    29.4    -      -       +      -
    453B  GLU*     3.4    36.8    -      -       +      +
    456B  MET*     3.4    22.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLU 330 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    326B  GLY      4.6     3.6    +      -       -      +
    327B  SER      3.3     5.6    +      -       -      +
    329B  VAL*     1.3    75.9    -      -       -      +
    331B  ALA*     1.3    63.4    +      -       -      +
    333B  PHE*     3.2    10.3    +      -       +      +
    334B  LEU*     3.0    23.6    +      -       -      +
    393B  VAL*     3.9    19.3    -      -       +      +
    399B  ARG*     2.9    37.7    +      -       -      +
    441B  LEU      4.9     1.6    -      -       -      +
    444B  LEU*     4.0    23.8    -      -       +      +
    445B  ARG*     3.6    27.2    +      -       -      +
    449B  HIS*     2.7    34.7    +      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 331 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    302B  LEU*     3.7    29.5    -      -       +      +
    327B  SER      3.0    17.5    +      -       -      +
    328B  ALA      3.8     2.0    -      -       -      +
    330B  GLU*     1.3    78.4    -      -       -      +
    332B  MET*     1.3    58.2    -      -       -      +
    334B  LEU*     3.4     5.1    +      -       -      +
    335B  ARG*     3.0    26.5    +      -       -      +
    390B  THR*     4.7     8.2    -      -       +      +
    393B  VAL*     4.2    14.2    -      -       +      +
    394B  ILE*     4.0    17.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with MET 332 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    295B  ALA*     3.5    14.4    -      -       +      +
    298B  HIS*     3.8    19.3    -      -       +      +
    299B  VAL*     3.5    43.5    -      -       +      -
    302B  LEU*     4.0    12.8    -      -       +      -
    328B  ALA      2.8    25.8    +      -       -      +
    329B  VAL      3.5     4.7    -      -       -      +
    331B  ALA*     1.3    70.1    -      -       -      +
    333B  PHE*     1.3    60.0    +      -       -      +
    335B  ARG*     3.2     7.0    +      -       -      +
    336B  SER*     2.8    30.7    +      -       -      -
    456B  MET*     3.8    13.2    -      -       +      -
    501B  XX9      3.7    46.8    -      -       +      -
----------------------------------------------------------
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Residues in contact with PHE 333 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    329B  VAL*     2.8    39.7    +      -       +      -
    330B  GLU*     3.2    12.8    +      -       +      +
    332B  MET*     1.3    74.2    -      -       +      +
    334B  LEU*     1.3    63.7    +      -       -      +
    336B  SER*     2.7    23.1    +      -       -      -
    337B  ALA*     3.2     9.2    +      -       -      +
    369B  MET*     4.0    18.1    -      -       +      +
    372B  PHE*     4.6     2.4    -      -       -      -
    444B  LEU*     3.9    31.0    -      -       +      -
    447B  PHE*     4.1    28.5    -      +       +      -
    448B  ASN      4.2    13.5    -      -       -      -
    449B  HIS*     5.0     3.8    -      +       -      -
    452B  ALA*     3.8    21.1    -      -       +      -
    501B  XX9      3.6    33.0    -      +       +      -
----------------------------------------------------------
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Residues in contact with LEU 334 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    330B  GLU      3.0    11.2    +      -       -      +
    331B  ALA*     3.5     9.4    -      -       -      +
    333B  PHE*     1.3    74.4    -      -       -      +
    335B  ARG*     1.3    64.3    +      -       -      +
    337B  ALA*     3.1    19.1    +      -       -      +
    338B  GLU      3.6     3.5    +      -       -      -
    372B  PHE*     4.2    24.2    -      -       +      -
    376B  ILE*     4.8     6.5    -      -       +      -
    381B  MET*     5.7     0.4    -      -       -      -
    386B  TYR*     3.6    30.0    -      -       +      +
    389B  LEU*     4.1    20.0    -      -       +      +
    390B  THR*     3.4    43.1    -      -       -      +
    393B  VAL*     4.5     4.5    -      -       +      -
    440B  ARG*     5.9     0.4    -      -       +      -
    441B  LEU*     4.2    21.3    -      -       +      -
    444B  LEU*     4.4     4.8    -      -       +      +
----------------------------------------------------------
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Residues in contact with ARG 335 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    264B  TYR*     3.0    46.2    +      -       -      +
    267B  GLN*     2.9    43.2    +      -       -      +
    298B  HIS*     3.8    42.0    -      -       +      +
    301B  VAL*     3.5    31.1    +      -       -      +
    302B  LEU*     4.7     9.4    -      -       -      +
    305B  PHE*     4.8     9.7    -      -       -      +
    331B  ALA      3.0    15.1    +      -       -      +
    332B  MET*     3.5    12.6    -      -       -      +
    334B  LEU*     1.3    74.0    -      -       -      +
    336B  SER*     1.3    67.2    +      -       -      +
    337B  ALA      3.1     0.5    +      -       -      -
    338B  GLU*     3.2    23.4    +      -       -      +
    339B  ILE*     3.5     9.8    +      -       +      +
    386B  TYR*     5.6     0.7    -      -       -      -
    390B  THR*     5.2     6.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with SER 336 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    298B  HIS*     4.8     0.4    -      -       -      -
    332B  MET      2.8    13.8    +      -       -      -
    333B  PHE*     2.7    21.2    +      -       -      -
    335B  ARG*     1.3    78.4    -      -       -      +
    337B  ALA*     1.3    61.0    +      -       -      +
    339B  ILE*     3.2    14.4    +      -       -      +
    340B  PHE*     3.3    19.2    -      -       -      -
    369B  MET*     3.6     5.0    -      -       -      +
    373B  TYR*     2.6    28.4    +      -       -      -
    501B  XX9      3.5    39.9    -      -       -      -
----------------------------------------------------------
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Residues in contact with ALA 337 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    333B  PHE      3.2     7.4    +      -       -      +
    334B  LEU*     3.1    11.6    +      -       +      +
    335B  ARG      3.0     0.8    -      -       -      -
    336B  SER*     1.3    78.1    +      -       -      +
    338B  GLU*     1.3    56.9    +      -       -      +
    340B  PHE*     2.9    20.1    +      -       -      +
    341B  ASN*     3.3    15.8    +      -       -      -
    372B  PHE*     4.2    15.0    -      -       +      -
    373B  TYR*     3.5    30.1    -      -       +      -
    376B  ILE*     4.4    11.0    -      -       +      -
    386B  TYR*     3.5    11.9    -      -       +      +
----------------------------------------------------------
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Residues in contact with GLU 338 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    264B  TYR*     2.6    31.7    +      -       -      -
    267B  GLN*     2.4    34.5    +      -       -      -
    334B  LEU      3.6     0.8    +      -       -      -
    335B  ARG*     3.2    17.5    +      -       -      +
    337B  ALA*     1.3    78.7    -      -       -      +
    339B  ILE*     1.3    66.5    +      -       +      +
    340B  PHE      3.4     0.9    +      -       -      -
    341B  ASN*     3.4    15.1    +      -       -      +
    383B  GLN*     4.4     7.7    -      -       -      +
    386B  TYR*     3.2    38.4    +      -       +      -
----------------------------------------------------------
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Residues in contact with ILE 339 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    267B  GLN*     5.4     2.9    -      -       -      +
    269B  MET*     5.2     3.4    -      -       +      -
    294B  MET*     4.4    10.8    -      -       +      -
    298B  HIS*     3.2    39.9    -      -       +      +
    335B  ARG*     3.5    10.5    +      -       +      +
    336B  SER*     3.2     9.9    +      -       -      +
    338B  GLU*     1.3    88.6    -      -       +      +
    340B  PHE*     1.3    68.3    +      -       +      +
    349B  SER*     4.0    13.2    +      -       -      -
    352B  LEU*     3.7    30.1    -      -       +      -
    501B  XX9      4.7     2.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with PHE 340 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    336B  SER      3.3    18.2    -      -       -      -
    337B  ALA      2.9     9.3    +      -       -      +
    339B  ILE*     1.3    77.3    -      -       +      +
    341B  ASN*     1.3    75.1    +      -       -      +
    349B  SER*     4.0    36.5    +      -       -      -
    352B  LEU*     3.7    15.5    -      -       +      -
    353B  GLU*     4.1     6.5    -      -       +      -
    356B  ILE*     3.3    27.6    -      -       +      -
    370B  PHE*     3.6    24.5    -      +       +      -
    373B  TYR*     3.3    32.5    -      +       +      -
    501B  XX9      3.9    17.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with ASN 341 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    337B  ALA      3.3    12.6    +      -       -      +
    338B  GLU*     3.4    13.2    +      -       -      +
    339B  ILE      3.5     0.2    -      -       -      -
    340B  PHE*     1.3   104.5    +      -       -      +
    373B  TYR*     2.8    33.2    +      -       -      +
    376B  ILE*     3.4    18.0    -      -       +      +
    377B  GLY*     3.6    13.3    +      -       -      -
    386B  TYR*     4.5     9.6    -      -       +      +
----------------------------------------------------------
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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