Contacts of the helix formed by residues 315 - 342 (chain B) in PDB entry 3AFF


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 315 (chain B).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    307B  LEU*     3.7    17.7    -      -       +      -
    313B  GLU      3.3    10.1    -      -       -      +
    314B  ILE*     1.4    89.8    -      -       +      +
    316B  PHE*     1.3    64.7    +      -       -      +
    317B  GLU*     4.2    25.4    -      -       +      +
    318B  LEU*     3.0    19.2    +      -       +      +
    319B  ARG*     3.3     9.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with PHE 316 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    314B  ILE      3.6     2.6    +      -       -      -
    315B  PRO*     1.3    69.7    -      -       -      +
    317B  GLU*     1.3    54.3    +      -       -      +
    319B  ARG*     3.0    32.3    +      -       -      +
    320B  ALA*     2.8    45.4    +      -       +      -
    391B  ASP*     3.2    52.9    -      -       +      -
    394B  VAL*     3.9    22.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLU 317 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    315B  PRO*     3.2    18.0    -      -       +      +
    316B  PHE*     1.3    79.8    -      -       -      +
    318B  LEU*     1.3    63.6    +      -       -      +
    320B  ALA*     3.5     7.5    +      -       -      +
    321B  ARG*     3.1    55.4    +      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 318 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    300B  ASN*     4.3     7.4    -      -       -      +
    303B  ASP*     4.2    11.9    -      -       +      -
    304B  GLU*     3.5    38.6    -      -       +      +
    307B  LEU*     3.8    28.0    -      -       +      -
    314B  ILE*     4.0     4.0    -      -       +      -
    315B  PRO*     3.0    19.0    +      -       +      +
    317B  GLU*     1.3    88.1    +      -       -      +
    319B  ARG*     1.3    60.7    +      -       -      +
    321B  ARG*     3.3    39.3    +      -       -      +
    322B  ALA*     2.9    27.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 319 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    232B  PRO*     3.7    28.5    -      -       +      +
    234B  GLY      5.6     0.2    -      -       -      +
    235B  THR*     4.5     2.3    +      -       -      +
    304B  GLU*     3.8     8.7    -      -       -      +
    314B  ILE*     3.7    32.6    +      -       +      -
    315B  PRO      3.3     6.0    +      -       -      -
    316B  PHE*     3.0    30.6    +      -       -      +
    318B  LEU*     1.3    80.2    -      -       -      +
    320B  ALA*     1.3    56.0    +      -       -      +
    322B  ALA*     3.4     3.4    +      -       -      +
    323B  ARG*     3.1    30.5    +      -       -      +
    391B  ASP      2.8    27.5    +      -       -      -
    392B  THR*     3.4    17.6    +      -       -      +
    394B  VAL*     3.3    35.8    +      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 320 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    316B  PHE*     2.8    34.0    +      -       +      +
    317B  GLU*     3.7     8.1    -      -       -      +
    319B  ARG*     1.3    69.8    -      -       -      +
    321B  ARG*     1.3    63.2    +      -       -      +
    323B  ARG*     3.4     5.1    -      -       -      +
    324B  ARG*     3.1    24.5    +      -       -      +
    394B  VAL*     3.6    18.3    -      -       +      +
----------------------------------------------------------
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Residues in contact with ARG 321 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    299B  GLY      5.2     0.4    -      -       -      -
    300B  ASN*     2.7    38.6    -      -       -      +
    303B  ASP*     3.4    22.2    +      -       -      -
    317B  GLU*     3.1    37.8    +      -       -      +
    318B  LEU*     3.4    26.7    -      -       -      +
    320B  ALA*     1.3    75.6    -      -       -      +
    322B  ALA*     1.4    60.7    +      -       -      +
    324B  ARG*     3.3    38.0    -      -       -      +
    325B  ASP*     3.1    38.4    +      -       -      -
----------------------------------------------------------
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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
----------------------------------------------------------
    234B  GLY      5.9     0.2    -      -       -      +
    235B  THR*     3.9    17.0    -      -       +      +
    297B  LEU*     5.8     0.3    -      -       -      +
    300B  ASN*     3.4    33.5    +      -       +      +
    304B  GLU*     3.9    13.9    -      -       -      +
    318B  LEU      2.9    17.3    +      -       -      +
    319B  ARG      3.7     5.2    -      -       -      +
    321B  ARG*     1.4    72.4    -      -       -      +
    323B  ARG*     1.3    65.0    +      -       -      +
    325B  ASP*     3.3     2.8    +      -       -      +
    326B  GLN*     3.2    29.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 323 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    234B  GLY*     3.5    22.2    +      -       -      +
    238B  PRO*     3.6    24.3    -      -       -      +
    319B  ARG      3.1    16.8    +      -       -      +
    320B  ALA*     3.4    10.3    -      -       -      +
    322B  ALA*     1.3    75.4    -      -       -      +
    324B  ARG*     1.3    63.3    +      -       -      +
    326B  GLN*     3.2    23.8    +      -       -      +
    327B  VAL*     4.2     6.2    +      -       -      +
    372B  ASP*     4.7     7.7    +      -       -      -
    374B  GLU*     3.2    35.1    +      -       -      +
    375B  ARG*     5.5     2.8    -      -       -      +
    378B  VAL*     4.5    10.5    -      -       -      +
    393B  MET      2.6    24.5    +      -       -      -
    394B  VAL*     3.6    28.8    -      -       +      +
----------------------------------------------------------
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Residues in contact with ARG 324 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    296B  GLN*     5.5     1.8    -      -       -      +
    320B  ALA      3.1    14.0    +      -       -      +
    321B  ARG*     3.3    39.5    +      -       -      +
    323B  ARG*     1.3    79.9    -      -       -      +
    325B  ASP*     1.3    79.3    +      -       -      +
    326B  GLN      3.4     0.9    +      -       -      -
    327B  VAL*     3.5    12.3    -      -       +      +
    328B  ARG*     3.3    53.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASP 325 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    296B  GLN*     3.6    32.1    +      -       +      +
    297B  LEU*     4.8     4.8    -      -       +      +
    300B  ASN*     3.0    28.2    +      -       -      +
    321B  ARG*     3.1    28.1    +      -       -      +
    322B  ALA      3.8     1.8    -      -       -      +
    323B  ARG      3.1     0.8    -      -       -      -
    324B  ARG*     1.3   102.7    +      -       -      +
    326B  GLN*     1.3    66.3    +      -       -      +
    327B  VAL      3.3     0.2    -      -       -      -
    328B  ARG*     3.5    16.2    -      -       -      -
    329B  ALA*     2.9    27.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLN 326 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    234B  GLY      5.0     0.2    -      -       -      +
    235B  THR*     4.0     5.4    -      -       -      +
    238B  PRO*     3.6    39.8    -      -       +      +
    239B  THR*     3.0    19.0    +      -       -      +
    242B  SER*     2.6    42.5    +      -       -      +
    297B  LEU*     3.3    15.7    -      -       -      +
    322B  ALA*     3.2    24.4    +      -       -      +
    323B  ARG*     3.2    18.6    +      -       -      +
    325B  ASP*     1.3    76.4    -      -       -      +
    327B  VAL*     1.3    62.8    +      -       +      +
    329B  ALA*     4.0     0.7    -      -       -      +
    330B  THR*     3.1    35.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 327 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    323B  ARG      4.3     8.5    -      -       -      +
    324B  ARG*     3.5    14.6    +      -       -      +
    326B  GLN*     1.3    76.9    -      -       +      +
    328B  ARG*     1.3    69.6    +      -       +      +
    330B  THR*     3.7     7.1    +      -       -      -
    331B  GLY*     2.8    31.2    +      -       -      -
    366B  ARG*     4.5    22.7    -      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 328 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    296B  GLN*     3.8    21.8    -      -       -      +
    324B  ARG*     3.3    55.0    +      -       -      +
    325B  ASP*     3.5    17.0    -      -       -      +
    326B  GLN      3.4     0.2    -      -       -      -
    327B  VAL*     1.3    82.2    -      -       +      +
    329B  ALA*     1.3    58.6    +      -       -      +
    331B  GLY*     3.9     0.2    -      -       -      -
    332B  ARG*     3.0    41.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 329 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    246B  VAL*     4.5     5.2    -      -       +      -
    293B  ALA*     3.5    31.6    -      -       +      +
    296B  GLN*     3.7    10.8    -      -       -      +
    297B  LEU*     4.2    17.7    -      -       +      +
    325B  ASP      2.9    18.0    +      -       -      +
    326B  GLN      4.1     1.3    -      -       -      +
    328B  ARG*     1.3    75.7    -      -       -      +
    330B  THR*     1.3    65.3    +      -       +      +
    332B  ARG*     3.5     0.6    +      -       -      -
    333B  SER*     2.8    29.4    +      -       -      -
----------------------------------------------------------
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Residues in contact with THR 330 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    242B  SER*     3.6    37.9    -      -       -      +
    245B  ILE*     4.0    26.7    -      -       +      -
    246B  VAL*     4.6     2.5    -      -       +      -
    326B  GLN      3.1    19.3    +      -       -      +
    327B  VAL*     3.7     6.8    +      -       -      -
    329B  ALA*     1.3    76.5    -      -       +      +
    331B  GLY*     1.3    58.2    +      -       -      +
    333B  SER*     3.4     5.6    +      -       -      -
    334B  ILE*     2.9    40.6    +      -       -      +
    366B  ARG*     4.0    16.9    +      -       -      -
----------------------------------------------------------
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Residues in contact with GLY 331 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    327B  VAL      2.8    18.8    +      -       -      -
    328B  ARG*     5.1     0.2    -      -       -      -
    330B  THR*     1.3    78.5    +      -       -      +
    332B  ARG*     1.3    56.0    +      -       -      +
    334B  ILE*     3.9     3.7    -      -       -      +
    335B  ALA*     3.0    29.5    +      -       -      +
    366B  ARG*     6.0     2.9    -      -       -      -
----------------------------------------------------------
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Residues in contact with ARG 332 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    289B  ASP*     4.1    32.5    +      -       -      +
    292B  ALA*     3.8    32.3    +      -       -      +
    293B  ALA*     4.2    10.3    -      -       +      +
    296B  GLN*     3.9    28.1    +      -       -      +
    328B  ARG*     3.0    26.2    +      -       -      +
    329B  ALA      4.0     2.7    -      -       -      +
    331B  GLY*     1.3    74.8    -      -       -      +
    333B  SER*     1.3    61.1    +      -       -      +
    335B  ALA*     3.4     8.1    +      -       -      +
    336B  SER*     3.2    25.3    +      -       -      -
----------------------------------------------------------
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Residues in contact with SER 333 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    245B  ILE*     4.7     3.6    -      -       -      -
    246B  VAL*     3.5    26.9    -      -       -      +
    249B  ALA*     3.7    21.2    -      -       -      +
    290B  ILE*     4.9     4.3    -      -       -      -
    293B  ALA*     3.5    11.1    -      -       -      +
    329B  ALA      2.8    19.8    +      -       -      -
    330B  THR*     3.6     6.7    -      -       -      -
    332B  ARG*     1.3    74.6    -      -       -      +
    334B  ILE*     1.3    62.0    +      -       -      +
    336B  SER*     3.3     7.9    +      -       -      -
    337B  ILE*     3.0    31.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 334 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    245B  ILE*     3.7    15.0    -      -       +      -
    330B  THR*     2.9    22.6    +      -       -      +
    331B  GLY*     4.1     3.6    -      -       -      +
    333B  SER*     1.3    74.3    -      -       -      +
    335B  ALA*     1.3    60.8    +      -       -      +
    337B  ILE*     3.3     6.4    +      -       +      +
    338B  ASP*     2.9    30.2    +      -       -      +
    362B  ALA*     3.6    41.5    -      -       +      +
    363B  HIS*     3.5    34.8    -      -       +      +
    366B  ARG*     3.6    26.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 335 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    331B  GLY      3.0    18.1    +      -       -      +
    332B  ARG*     3.6     8.1    -      -       -      +
    334B  ILE*     1.3    76.2    -      -       -      +
    336B  SER*     1.3    62.1    +      -       -      +
    338B  ASP*     3.3     5.4    +      -       -      -
    339B  ARG*     3.1    41.9    +      -       -      +
----------------------------------------------------------
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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
----------------------------------------------------------
    286B  ALA*     3.7    12.6    +      -       -      +
    289B  ASP*     3.6    24.8    +      -       -      +
    290B  ILE*     3.6    27.7    -      -       -      +
    332B  ARG      3.2    14.3    +      -       -      -
    333B  SER      3.4     9.6    -      -       -      -
    335B  ALA*     1.3    72.3    -      -       -      +
    337B  ILE*     1.3    65.6    +      -       -      +
    339B  ARG*     3.4     7.2    +      -       -      +
    340B  LEU*     3.0    29.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 337 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    245B  ILE      4.8     1.3    -      -       -      +
    248B  MET      4.0     4.9    -      -       -      +
    249B  ALA*     3.5    38.4    -      -       +      +
    252B  ALA*     3.9    16.1    -      -       +      +
    333B  SER      3.0    17.9    +      -       -      +
    334B  ILE*     3.6    12.8    -      -       +      +
    336B  SER*     1.3    76.9    -      -       -      +
    338B  ASP*     1.3    57.0    +      -       -      +
    340B  LEU*     3.3     8.7    +      -       +      +
    341B  PHE*     2.9    27.9    +      -       +      +
    355B  ILE*     5.4     0.9    -      -       +      +
    358B  PHE      4.3     2.2    -      -       -      +
    359B  TRP*     3.7    34.8    -      -       +      -
    362B  ALA*     3.5    31.0    -      -       +      -
    363B  HIS*     5.5     1.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with ASP 338 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    334B  ILE*     2.9    23.6    +      -       -      +
    335B  ALA*     3.3     6.6    +      -       -      +
    337B  ILE*     1.3    75.9    -      -       -      +
    339B  ARG*     1.3    79.5    +      -       -      +
    341B  PHE*     3.4     7.6    +      -       -      +
    342B  GLU*     3.2    31.8    +      -       -      +
    359B  TRP*     2.7    33.3    +      -       -      +
    363B  HIS*     2.8    23.5    +      -       -      -
----------------------------------------------------------
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Residues in contact with ARG 339 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    285B  GLU*     5.7     4.7    -      -       -      +
    286B  ALA*     5.8     4.7    -      -       +      -
    335B  ALA*     3.1    32.5    +      -       -      +
    336B  SER*     3.7    11.0    -      -       -      +
    337B  ILE      3.3     0.2    -      -       -      -
    338B  ASP*     1.3    86.9    +      -       -      +
    340B  LEU*     1.3    65.5    +      -       +      +
    342B  GLU*     3.2    39.2    +      -       -      +
    343B  ALA*     3.1    24.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 340 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    252B  ALA*     4.2     2.2    -      -       +      -
    253B  TYR*     3.7    47.8    -      -       +      +
    256B  HIS*     3.7    33.7    -      -       +      +
    284B  ALA      5.6     2.0    -      -       -      +
    286B  ALA*     4.1    17.9    -      -       +      -
    290B  ILE*     4.4     7.4    -      -       +      -
    336B  SER      3.0    26.8    +      -       -      +
    337B  ILE*     3.7     7.6    -      -       -      +
    339B  ARG*     1.3    73.8    -      -       +      +
    341B  PHE*     1.3    58.7    +      -       -      +
    343B  ALA*     3.0    12.0    +      -       +      +
    344B  SER*     2.7    26.8    +      -       -      -
    355B  ILE*     4.3    14.8    -      -       +      -
----------------------------------------------------------
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Residues in contact with PHE 341 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    337B  ILE      2.9    17.8    +      -       -      +
    338B  ASP*     3.5     7.4    -      -       -      +
    339B  ARG      3.3     0.2    -      -       -      -
    340B  LEU*     1.3    76.3    -      -       -      +
    342B  GLU*     1.3    66.3    +      -       +      +
    343B  ALA      3.3     0.7    +      -       -      -
    344B  SER      4.0     1.9    +      -       -      -
    345B  GLY      4.9     0.7    -      -       -      +
    348B  ALA*     3.5    49.0    -      -       +      +
    349B  LEU*     3.8    22.7    -      -       +      -
    355B  ILE*     4.1    21.9    -      -       +      +
    356B  GLN*     3.7    18.4    -      -       +      -
    359B  TRP*     3.7    56.5    -      +       +      -
----------------------------------------------------------
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Residues in contact with GLU 342 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    338B  ASP*     3.2    19.6    +      -       -      +
    339B  ARG*     3.5    33.9    +      -       -      +
    340B  LEU      3.2     0.2    -      -       -      -
    341B  PHE*     1.3    87.6    -      -       +      +
    343B  ALA*     1.3    58.5    +      -       -      +
    344B  SER      3.6     1.7    +      -       -      -
    345B  GLY      5.4     1.9    +      -       -      -
----------------------------------------------------------
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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