Contacts of the helix formed by residues 229 - 253 (chain C) in PDB entry 2AXT


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 ASN 229 (chain C).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    189C  TRP*     4.8     4.9    -      -       +      -
    212C  TYR*     3.9     6.1    +      -       -      -
    227C  VAL*     3.4     3.3    +      -       -      +
    228C  ASN*     1.3    94.2    -      -       -      +
    230C  LEU*     1.3    63.7    +      -       -      +
    231C  GLU*     3.1    32.3    +      -       +      +
    232C  ASP*     2.5    44.9    +      -       -      +
    233C  VAL*     3.4    12.5    +      -       -      +
    295C  THR*     4.0     8.7    -      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 230 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    185C  LEU*     4.0    22.4    -      -       +      -
    186C  TYR      2.7    33.0    -      -       -      +
    187C  ASP*     4.0    20.2    +      -       +      +
    197C  ARG*     4.8     4.0    -      -       -      +
    199C  ILE*     3.8    32.1    -      -       +      -
    229C  ASN*     1.3    70.2    -      -       -      +
    231C  GLU*     1.3    66.4    +      -       -      +
    232C  ASP      3.2     0.2    -      -       -      -
    233C  VAL*     3.7    20.2    -      -       +      -
    234C  VAL*     2.8    32.0    +      -       +      +
    295C  THR*     4.4    17.9    -      -       +      +
    296C  VAL*     5.0     2.7    -      -       +      -
    491C  CLA      4.6    11.0    -      -       -      -
----------------------------------------------------------
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Residues in contact with GLU 231 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    197C  ARG*     2.3    40.0    +      -       -      -
    199C  ILE*     4.4     9.9    -      -       -      +
    200C  THR      5.1     0.3    +      -       -      -
    201C  ASN*     3.6    37.5    +      -       -      +
    202C  PRO*     3.6     1.8    -      -       -      +
    203C  THR*     3.1    21.5    +      -       -      +
    229C  ASN*     3.1    21.7    -      -       +      +
    230C  LEU*     1.3    72.7    +      -       -      +
    232C  ASP*     1.3    53.1    +      -       -      +
    234C  VAL*     3.6     0.2    -      -       -      +
    235C  GLY      2.7    31.7    +      -       -      -
----------------------------------------------------------
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Residues in contact with ASP 232 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    203C  THR*     3.0    21.7    +      -       -      +
    208C  VAL*     3.0    26.1    -      -       -      +
    209C  ILE*     4.1     3.1    -      -       +      +
    212C  TYR*     2.9    36.5    +      -       +      +
    227C  VAL*     4.4     2.2    -      -       +      -
    229C  ASN*     2.5    36.4    +      -       -      +
    230C  LEU      3.2     0.4    -      -       -      -
    231C  GLU*     1.3    73.8    -      -       -      +
    233C  VAL*     1.3    57.9    +      -       -      +
    236C  GLY*     2.6    33.8    +      -       -      -
    506C  BCR      3.4    10.2    -      -       +      +
----------------------------------------------------------
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Residues in contact with VAL 233 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    175C  LEU*     4.7     4.9    -      -       +      -
    185C  LEU*     5.6     0.9    -      -       +      -
    227C  VAL*     3.4    25.1    -      -       +      -
    229C  ASN      3.4    10.3    +      -       -      +
    230C  LEU*     3.3    21.4    +      -       +      +
    232C  ASP*     1.3    78.1    -      -       -      +
    234C  VAL*     1.3    61.4    +      -       +      +
    237C  HIS*     2.7    44.7    +      -       +      +
    295C  THR*     4.8     1.1    -      -       +      -
    296C  VAL*     3.6    21.5    -      -       +      -
    491C  CLA      3.3    32.3    -      -       +      +
    506C  BCR      3.7     9.3    -      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 234 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    175C  LEU*     5.6     4.7    -      -       +      -
    176C  VAL*     3.9    27.8    -      -       +      +
    179C  ALA*     3.9    13.2    -      -       +      -
    180C  MET*     4.0     8.3    -      -       +      -
    185C  LEU*     4.4     9.2    -      -       +      -
    199C  ILE*     3.8    26.0    -      -       +      -
    202C  PRO*     3.7    22.7    -      -       +      -
    230C  LEU*     2.8    26.3    +      -       +      +
    231C  GLU      3.6     2.7    -      -       -      +
    233C  VAL*     1.3    76.3    -      -       +      +
    235C  GLY*     1.3    67.5    +      -       -      +
    237C  HIS*     2.8    16.4    +      -       -      +
    238C  ILE*     3.0    12.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLY 235 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    202C  PRO*     3.7     9.8    -      -       -      +
    203C  THR      3.2    29.8    -      -       -      -
    209C  ILE*     3.9     0.7    -      -       -      -
    231C  GLU      2.7    21.2    +      -       -      -
    232C  ASP      3.8     0.2    -      -       -      -
    234C  VAL*     1.3    72.5    -      -       -      +
    236C  GLY*     1.3    56.6    +      -       -      +
    238C  ILE*     3.1     7.2    +      -       -      +
    239C  TRP*     2.9    32.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLY 236 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    209C  ILE*     3.5    18.1    -      -       -      +
    232C  ASP      2.6    22.2    +      -       -      -
    233C  VAL      4.0     0.9    -      -       -      -
    235C  GLY*     1.3    72.7    -      -       -      -
    237C  HIS*     1.3    60.5    +      -       -      +
    239C  TRP*     3.4     8.3    +      -       -      +
    240C  ILE*     3.4    23.0    +      -       -      +
    506C  BCR      4.0    24.4    -      -       -      +
----------------------------------------------------------
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Residues in contact with HIS 237 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    172C  ALA*     4.3    15.8    -      -       +      +
    173C  LEU*     4.4     3.6    -      -       -      +
    175C  LEU*     3.5    26.3    -      -       +      +
    176C  VAL*     4.0    14.6    -      -       +      -
    233C  VAL*     2.7    26.8    +      -       +      +
    234C  VAL      2.8     9.6    +      -       -      +
    236C  GLY*     1.3    73.2    -      -       -      +
    238C  ILE*     1.3    60.0    +      -       -      +
    239C  TRP      3.1     1.6    -      -       -      -
    240C  ILE*     2.7    32.4    +      -       +      +
    241C  GLY      3.5     4.2    +      -       -      -
    491C  CLA      2.2    72.1    +      +       +      -
    506C  BCR      3.4    19.2    -      -       +      +
----------------------------------------------------------
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Residues in contact with ILE 238 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    173C  LEU*     4.1     9.8    -      -       +      +
    176C  VAL*     3.4    37.0    -      -       +      -
    180C  MET*     3.8     5.6    -      -       +      -
    202C  PRO*     3.5    33.9    -      -       +      -
    234C  VAL      3.0    12.5    +      -       -      +
    235C  GLY*     3.4     7.0    -      -       -      +
    237C  HIS*     1.3    76.2    -      -       -      +
    239C  TRP*     1.3    62.9    +      -       +      +
    240C  ILE      2.9     6.2    +      -       -      -
    241C  GLY      3.7     0.9    +      -       -      -
    242C  LEU*     3.2    46.1    +      -       +      +
----------------------------------------------------------
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Residues in contact with TRP 239 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    203C  THR      3.9     6.1    -      -       -      -
    204C  LEU*     3.8     5.2    -      -       -      +
    205C  ASP      3.5    21.6    -      -       -      +
    206C  PRO*     3.8    31.0    -      -       +      -
    209C  ILE*     3.9    22.9    -      -       +      -
    210C  PHE*     3.5    33.1    -      +       +      -
    235C  GLY*     2.9    20.6    +      -       -      +
    236C  GLY*     3.5    11.9    -      -       -      +
    237C  HIS      3.1     0.2    -      -       -      -
    238C  ILE*     1.3    81.2    -      -       +      +
    240C  ILE*     1.3    57.2    +      -       -      +
    242C  LEU*     4.6     7.6    -      -       +      -
    243C  ILE*     2.9    42.1    -      -       +      +
    506C  BCR      5.3     2.3    -      -       +      +
----------------------------------------------------------
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Residues in contact with ILE 240 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    172C  ALA*     4.0    18.6    -      -       +      -
    236C  GLY      3.5    13.5    -      -       -      +
    237C  HIS*     2.7    18.7    +      -       +      +
    238C  ILE      2.9     1.0    +      -       -      -
    239C  TRP*     1.3    80.7    -      -       -      +
    241C  GLY*     1.3    55.1    +      -       -      +
    242C  LEU      3.2     0.9    -      -       -      -
    243C  ILE*     2.9     8.7    +      -       +      +
    244C  CYS*     2.4    55.1    +      -       +      +
    491C  CLA      3.4    46.9    -      -       +      -
    497C  CLA      3.8    17.9    -      -       +      -
    506C  BCR      4.4    21.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLY 241 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    169C  GLY*     4.1    12.8    -      -       -      -
    172C  ALA*     4.7     0.8    -      -       -      +
    173C  LEU*     4.5     7.0    -      -       -      -
    237C  HIS      3.5     6.5    +      -       -      -
    238C  ILE      3.7     1.2    +      -       -      -
    240C  ILE*     1.3    75.7    -      -       -      +
    242C  LEU*     1.3    56.4    +      -       -      +
    243C  ILE      2.4    18.2    +      -       -      -
    244C  CYS*     4.0     6.3    -      -       -      -
    245C  ILE*     2.6    46.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 242 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    173C  LEU*     4.6    18.4    -      -       +      -
    238C  ILE*     3.2    37.0    -      -       +      +
    239C  TRP*     5.0     6.2    -      -       +      -
    240C  ILE      3.2     0.4    -      -       -      -
    241C  GLY*     1.3    74.7    -      -       -      +
    243C  ILE*     1.3    65.5    +      -       +      +
    245C  ILE*     5.5     3.1    -      -       +      -
    246C  ALA*     4.2    10.8    -      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 243 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    210C  PHE*     3.8    18.4    -      -       +      -
    239C  TRP*     2.9    48.5    -      -       +      +
    240C  ILE*     3.1    11.9    -      -       +      +
    241C  GLY      2.4    20.0    +      -       -      -
    242C  LEU*     1.3    73.6    -      -       -      +
    244C  CYS*     1.3    59.5    +      -       -      +
    245C  ILE      3.3     1.1    -      -       -      -
    246C  ALA*     3.4    10.9    +      -       -      +
    247C  GLY      3.0    20.8    +      -       -      -
    496C  CLA      3.1    35.2    -      -       +      +
    497C  CLA      4.9    17.0    -      -       +      -
    506C  BCR      5.6     1.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with CYS 244 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    165C  LEU*     3.0    48.6    -      -       -      +
    168C  LEU*     4.4    17.0    -      -       -      -
    169C  GLY*     4.3     4.0    -      -       -      -
    240C  ILE*     2.4    43.7    +      -       +      +
    241C  GLY*     4.0     3.8    -      -       -      -
    243C  ILE*     1.3    75.5    -      -       -      +
    245C  ILE*     1.3    55.7    +      -       -      +
    248C  GLY      3.0    16.3    +      -       -      -
    491C  CLA      5.0     2.5    -      -       -      -
    496C  CLA      3.9     7.2    -      -       -      -
    497C  CLA      4.1    26.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with ILE 245 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    165C  LEU      4.1     3.1    -      -       -      -
    166C  ILE*     3.4    31.2    -      -       +      +
    169C  GLY*     3.7    32.8    -      -       -      -
    170C  ILE*     4.3    13.2    -      -       +      +
    173C  LEU*     4.2    18.4    -      -       +      -
    241C  GLY      2.6    21.4    +      -       -      +
    242C  LEU*     5.5     3.4    -      -       +      -
    244C  CYS*     1.3    69.6    -      -       -      +
    246C  ALA*     1.3    61.6    +      -       -      +
    247C  GLY      2.9     5.6    -      -       -      -
    248C  GLY      2.9    10.5    +      -       -      +
    249C  ILE*     3.0    32.2    -      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 246 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    241C  GLY      3.7     1.6    +      -       -      -
    242C  LEU*     4.2     6.5    -      -       -      +
    243C  ILE*     3.4    23.7    -      -       -      +
    245C  ILE*     1.3    79.2    -      -       -      +
    247C  GLY*     1.3    58.4    +      -       -      +
    249C  ILE*     3.8     6.0    +      -       -      +
    250C  TRP*     3.4    20.6    +      -       -      +
    496C  CLA      3.8    11.3    -      -       +      +
----------------------------------------------------------
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Residues in contact with GLY 247 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    165C  LEU*     4.3     1.8    -      -       -      -
    243C  ILE      3.0    12.0    +      -       -      -
    244C  CYS      3.8     2.5    -      -       -      -
    245C  ILE      2.9     0.8    -      -       -      -
    246C  ALA*     1.3    76.2    -      -       -      +
    248C  GLY*     1.3    61.8    +      -       -      +
    249C  ILE      2.9     6.0    +      -       -      -
    250C  TRP*     3.2     4.5    +      -       -      -
    251C  HIS*     3.1    32.8    +      -       -      -
    496C  CLA      3.5    29.8    -      -       -      -
----------------------------------------------------------
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Residues in contact with GLY 248 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    162C  GLY*     3.0    29.2    -      -       -      +
    165C  LEU*     3.4    12.7    -      -       -      +
    166C  ILE*     3.5     5.8    -      -       -      -
    244C  CYS      3.0     8.8    +      -       -      -
    245C  ILE      2.9     7.4    +      -       -      -
    247C  GLY*     1.3    76.6    -      -       -      +
    249C  ILE*     1.3    61.9    +      -       -      +
    252C  ILE*     2.9    28.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 249 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    166C  ILE*     3.8    13.5    -      -       +      -
    245C  ILE*     3.0    42.1    +      -       +      +
    246C  ALA*     4.0     6.3    -      -       -      +
    247C  GLY      2.9     0.8    -      -       -      -
    248C  GLY*     1.3    79.1    -      -       -      +
    250C  TRP*     1.3    56.4    +      -       -      +
    251C  HIS      2.7    16.6    +      -       -      -
    252C  ILE*     2.8    18.7    +      -       +      -
    253C  LEU*     3.0    37.2    +      -       +      +
----------------------------------------------------------
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Residues in contact with TRP 250 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    246C  ALA      3.4    14.8    +      -       -      +
    247C  GLY*     3.2     7.2    +      -       -      +
    249C  ILE*     1.3    81.8    -      -       -      +
    251C  HIS*     1.3    78.5    +      +       -      +
    253C  LEU*     3.9     5.2    -      -       -      -
    254C  THR*     2.7    37.2    +      -       +      -
    257C  PHE*     3.5    32.3    -      +       -      -
    496C  CLA      3.1    64.8    +      +       +      -
----------------------------------------------------------
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Residues in contact with HIS 251 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    155C  ASN*     4.7     1.0    +      -       -      -
    158C  THR*     2.9    56.1    -      -       +      +
    159C  THR*     4.0     0.7    +      -       -      -
    161C  LEU*     4.1     7.2    -      -       +      +
    162C  GLY*     3.9     8.1    -      -       -      -
    165C  LEU*     3.3    22.9    -      -       +      -
    247C  GLY*     3.1    23.8    +      -       -      +
    249C  ILE      2.7     5.7    +      -       -      -
    250C  TRP*     1.3    82.1    -      +       -      +
    252C  ILE*     1.3    61.0    +      -       -      +
    253C  LEU      2.9     5.9    +      -       -      -
    254C  THR      3.2     8.0    -      -       -      +
    496C  CLA      2.5    76.0    +      +       +      -
----------------------------------------------------------
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Residues in contact with ILE 252 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    155C  ASN*     5.8     1.4    +      -       -      -
    159C  THR*     3.6    44.7    +      -       +      +
    162C  GLY*     3.8     0.4    -      -       -      -
    163C  PHE*     3.3    36.8    -      -       +      +
    166C  ILE*     3.6    15.3    -      -       +      -
    248C  GLY      2.9    25.8    -      -       -      +
    249C  ILE*     2.8    12.9    +      -       +      +
    251C  HIS*     1.3    71.9    -      -       -      +
    253C  LEU*     1.3    66.9    +      -       +      +
    254C  THR      3.6     1.0    +      -       -      -
----------------------------------------------------------
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Residues in contact with LEU 253 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    249C  ILE*     3.0    38.6    +      -       +      +
    250C  TRP*     4.2     5.4    -      -       -      +
    251C  HIS      2.9     1.0    -      -       -      -
    252C  ILE*     1.3    89.9    -      -       +      +
    254C  THR*     1.3    64.4    +      -       -      +
----------------------------------------------------------
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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