Contacts of the helix formed by residues 241 - 266 (chain C) in PDB entry 3RHW


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 ALA 241 (chain C).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    242B  ILE*     4.0    24.9    -      -       +      -
    243B  PRO*     5.5     3.1    -      -       +      -
    298B  ASN*     5.5     0.2    -      -       -      +
    237C  PHE*     4.8     2.5    -      -       +      +
    238C  ASP*     3.0    32.4    +      -       -      +
    239C  ARG      4.8     0.2    -      -       -      -
    240C  THR*     1.3    77.3    +      -       -      +
    242C  ILE*     1.3    63.1    -      -       -      +
    243C  PRO*     3.2     8.1    -      -       +      -
    244C  ALA*     3.5    13.8    +      -       +      +
    245C  ARG*     3.8     7.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 242 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    239C  ARG*     4.7     5.4    -      -       -      +
    240C  THR      3.1     7.3    +      -       -      +
    241C  ALA*     1.3    71.8    -      -       -      +
    243C  PRO*     1.3    81.6    -      -       +      +
    244C  ALA      3.1     2.5    -      -       -      -
    245C  ARG*     2.9    40.5    +      -       +      +
    246C  VAL*     3.0    27.6    +      -       +      +
    294C  PHE*     3.9    28.0    -      -       +      +
    297C  VAL*     6.3     0.9    -      -       +      -
    298C  ASN*     4.0    30.5    -      -       +      +
----------------------------------------------------------
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Residues in contact with PRO 243 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    243B  PRO*     4.3    25.4    -      -       +      -
    240C  THR      4.4     2.2    -      -       -      +
    241C  ALA*     3.2    10.1    -      -       +      -
    242C  ILE*     1.3   100.8    -      -       +      +
    244C  ALA*     1.3    61.7    +      -       -      +
    246C  VAL*     3.7     5.3    +      -       +      +
    247C  THR*     3.1    29.4    +      -       -      -
----------------------------------------------------------
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Residues in contact with ALA 244 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    242B  ILE*     3.7    29.8    -      -       +      -
    243B  PRO*     4.9     5.5    -      -       -      +
    246B  VAL*     3.8    22.7    -      -       +      +
    237C  PHE*     4.5    13.9    -      -       +      -
    241C  ALA*     3.5     9.7    +      -       -      +
    242C  ILE      3.1     0.8    -      -       -      -
    243C  PRO*     1.3    80.3    -      -       -      +
    245C  ARG*     1.3    61.9    +      -       -      +
    247C  THR*     3.5     4.8    +      -       -      -
    248C  LEU*     3.2    29.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 245 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    234C  SER*     2.7    37.6    +      -       -      +
    235C  PHE*     3.7     8.7    +      -       -      +
    237C  PHE*     3.1    29.9    +      -       +      -
    238C  ASP      4.5     3.1    +      -       -      -
    239C  ARG*     4.2     8.8    -      -       -      +
    241C  ALA      4.1    10.3    -      -       -      +
    242C  ILE*     2.9    24.6    +      -       +      +
    244C  ALA*     1.3    74.7    -      -       -      +
    246C  VAL*     1.3    61.5    +      -       -      +
    248C  LEU*     3.3     2.1    +      -       -      +
    249C  GLY      2.9    25.8    +      -       -      -
    293C  GLU*     3.4    17.0    +      -       -      -
    294C  PHE*     3.1    34.9    +      -       +      +
    297C  VAL*     4.0    14.8    -      -       -      +
    316C  ASP*     2.6    43.0    +      -       -      -
----------------------------------------------------------
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Residues in contact with VAL 246 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    242C  ILE*     3.0    34.8    +      -       +      +
    243C  PRO*     4.1     4.7    -      -       +      +
    245C  ARG*     1.3    72.3    -      -       -      +
    247C  THR*     1.3    67.9    +      -       -      +
    250C  VAL*     2.8    48.1    +      -       +      +
    291C  LEU*     4.4    13.7    -      -       +      -
    294C  PHE*     5.0     4.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with THR 247 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    243B  PRO      5.6     0.8    +      -       -      -
    246B  VAL*     3.5    24.2    -      -       +      +
    247B  THR*     4.5    22.6    +      -       -      +
    250B  VAL*     4.6     5.6    -      -       +      -
    243C  PRO      3.1    20.5    +      -       -      -
    244C  ALA*     3.7     5.2    -      -       -      -
    245C  ARG      3.3     0.2    -      -       -      -
    246C  VAL*     1.3    77.3    -      -       -      +
    248C  LEU*     1.3    60.6    +      -       -      +
    250C  VAL*     4.4     1.7    -      -       -      +
    251C  THR*     2.7    38.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 248 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    246B  VAL*     3.8     8.7    -      -       +      -
    250B  VAL*     3.2    29.6    -      -       +      -
    291B  LEU*     4.2     8.7    -      -       +      -
    230C  VAL*     3.6    29.8    -      -       +      +
    231C  SER*     5.2     1.3    -      -       -      -
    233C  VAL*     3.6    13.5    -      -       +      -
    234C  SER*     3.6    28.5    -      -       -      +
    237C  PHE*     3.6    25.6    -      -       +      -
    244C  ALA      3.2    12.0    +      -       -      +
    245C  ARG      3.6     5.8    -      -       -      +
    247C  THR*     1.3    78.0    -      -       -      +
    249C  GLY*     1.3    65.6    +      -       -      +
    250C  VAL      3.0     0.7    +      -       -      -
    251C  THR*     3.1     2.1    +      -       -      -
    252C  THR*     3.0    30.4    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLY 249 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    231C  SER*     4.9     6.9    -      -       -      +
    245C  ARG      2.9    19.2    +      -       -      -
    246C  VAL      3.9     0.4    -      -       -      -
    248C  LEU*     1.3    73.1    -      -       -      +
    250C  VAL*     1.3    57.7    +      -       -      +
    252C  THR*     3.2    16.2    +      -       -      -
    253C  LEU*     3.3    14.9    +      -       -      +
    287C  ILE*     3.4    10.5    -      -       -      +
    290C  ALA*     5.5     0.2    -      -       -      -
    291C  LEU*     3.9    21.3    -      -       -      +
    294C  PHE*     4.1     8.9    -      -       -      -
----------------------------------------------------------
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Residues in contact with VAL 250 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    246C  VAL*     2.8    41.4    +      -       +      +
    247C  THR*     4.4     2.0    -      -       -      +
    249C  GLY*     1.3    72.0    -      -       -      +
    251C  THR*     1.3    62.6    +      -       -      +
    252C  THR      3.3     0.4    -      -       -      -
    253C  LEU*     3.3     7.2    +      -       +      +
    254C  LEU*     2.9    36.7    +      -       +      +
    291C  LEU*     4.0    20.9    -      -       +      -
    230D  VAL*     5.3     7.6    -      -       +      -
----------------------------------------------------------
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Residues in contact with THR 251 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    250B  VAL*     3.1    33.2    -      -       +      +
    251B  THR*     5.7     0.2    -      -       -      -
    254B  LEU*     3.3    30.7    -      -       +      +
    247C  THR*     2.7    27.1    +      -       -      +
    248C  LEU      3.1     2.5    +      -       -      -
    250C  VAL*     1.3    79.1    -      -       -      +
    252C  THR*     1.3    60.3    +      -       +      +
    254C  LEU*     3.9     5.8    -      -       -      +
    255C  THR*     2.9    35.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with THR 252 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    250B  VAL*     5.9     1.3    -      -       +      -
    253B  LEU*     6.2     0.9    -      -       +      -
    227C  LEU*     3.7    37.4    -      -       +      +
    230C  VAL*     3.6    31.6    -      -       +      -
    231C  SER*     3.8     7.4    -      -       -      +
    248C  LEU*     3.0    21.4    +      -       +      +
    249C  GLY*     3.2    10.7    +      -       -      -
    251C  THR*     1.3    80.3    -      -       +      +
    253C  LEU*     1.3    58.9    +      -       -      +
    255C  THR*     4.5     1.1    -      -       -      -
    256C  MET*     3.0    27.2    +      -       -      +
    287C  ILE*     3.3    18.8    -      -       -      +
----------------------------------------------------------
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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  GLY      3.3    15.9    +      -       -      +
    250C  VAL*     3.3     6.7    +      -       +      +
    251C  THR      3.2     0.4    -      -       -      -
    252C  THR*     1.3    79.8    +      -       -      +
    254C  LEU*     1.3    66.1    +      -       -      +
    256C  MET*     3.2     6.7    -      -       -      +
    257C  THR*     3.1    22.0    +      -       -      +
    284C  MET*     3.8    24.7    -      -       +      +
    287C  ILE*     3.7    16.2    -      -       +      -
    288C  PHE*     4.1     7.9    -      -       +      +
    291C  LEU*     4.7     9.9    -      -       +      -
    226D  MET*     3.3    38.4    -      -       +      -
    227D  LEU*     5.2     7.0    -      -       +      -
    230D  VAL*     4.2    22.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 254 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    254B  LEU*     5.2    10.5    -      -       +      -
    250C  VAL*     2.9    25.1    +      -       +      +
    251C  THR*     3.9     6.3    -      -       -      +
    253C  LEU*     1.3    76.9    -      -       -      +
    255C  THR*     1.3    69.0    +      -       -      +
    257C  THR*     3.0    19.4    +      -       +      -
    258C  ALA*     3.1    18.0    +      -       +      +
----------------------------------------------------------
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Residues in contact with THR 255 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    254B  LEU*     3.0    35.2    -      -       +      +
    257B  THR*     4.5    22.9    -      -       +      +
    227C  LEU*     3.5    31.1    -      -       +      +
    251C  THR*     2.9    21.8    +      -       -      +
    252C  THR*     3.9     1.8    -      -       -      -
    254C  LEU*     1.3    79.1    -      -       -      +
    256C  MET*     1.3    62.7    +      -       -      +
    258C  ALA*     3.2     7.1    +      -       +      +
    259C  GLN*     2.9    24.9    +      -       +      +
----------------------------------------------------------
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Residues in contact with MET 256 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    224C  SER*     3.3    30.5    -      -       -      +
    227C  LEU*     3.7    17.5    -      -       -      +
    252C  THR      3.0    15.4    +      -       -      +
    253C  LEU*     3.2    14.1    -      -       +      +
    254C  LEU      3.2     0.2    -      -       -      -
    255C  THR*     1.3    77.2    -      -       -      +
    257C  THR*     1.3    62.0    +      -       -      +
    259C  GLN*     3.3     6.9    +      -       -      +
    260C  SER*     3.1    22.2    +      -       -      -
    279C  TRP*     4.6     0.2    -      -       +      -
    280C  ILE*     4.0    28.9    -      -       +      +
    283C  CYS*     3.3    32.8    -      -       +      -
    284C  MET*     3.4    27.8    -      -       -      -
    287C  ILE*     4.4    10.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with THR 257 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    253C  LEU*     3.1     4.9    +      -       -      +
    254C  LEU*     3.0    15.4    +      -       +      -
    256C  MET*     1.3    78.2    -      -       -      +
    258C  ALA*     1.3    66.0    +      -       -      +
    260C  SER*     3.1     9.0    +      -       -      -
    261C  ALA*     2.9    24.5    +      -       +      +
    284C  MET*     2.9    28.6    -      -       -      +
    223D  PRO*     6.1     4.7    -      -       +      +
    226D  MET*     5.3     0.3    -      -       -      +
    227D  LEU*     5.3     8.3    -      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 258 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    254C  LEU*     3.1    15.1    +      -       +      +
    255C  THR*     3.5    12.1    -      -       +      +
    257C  THR*     1.3    79.4    -      -       -      +
    259C  GLN*     1.3    65.7    +      -       -      +
    261C  ALA*     3.0    12.2    +      -       -      +
    262C  GLY*     3.0    17.8    +      -       -      -
----------------------------------------------------------
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Residues in contact with GLN 259 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    257B  THR*     6.0     5.4    -      -       +      -
    219C  GLN      3.8     9.3    +      -       -      +
    220C  LEU*     2.9    52.7    +      -       +      +
    223C  PRO*     4.0     8.9    -      -       -      +
    224C  SER*     3.0    21.6    +      -       -      -
    227C  LEU*     4.2    17.2    -      -       -      +
    255C  THR*     2.9    16.3    +      -       +      +
    256C  MET*     3.6    11.6    -      -       -      +
    258C  ALA*     1.3    74.2    -      -       -      +
    260C  SER*     1.3    63.3    +      -       -      +
    262C  GLY*     3.1    11.7    +      -       -      -
    263C  ILE*     3.3    15.3    +      -       +      +
    280C  ILE*     4.8     1.7    -      -       -      +
----------------------------------------------------------
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Residues in contact with SER 260 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    256C  MET      3.1     6.5    +      -       -      -
    257C  THR*     3.1     9.5    +      -       -      -
    259C  GLN*     1.3    76.5    -      -       -      +
    261C  ALA*     1.3    61.3    +      -       -      +
    262C  GLY      3.2     0.2    +      -       -      -
    263C  ILE*     3.2     6.3    +      -       -      +
    264C  ASN*     2.8    51.5    +      -       -      +
    280C  ILE*     3.6    42.6    -      -       -      +
    219D  GLN*     4.6     2.6    +      -       -      -
----------------------------------------------------------
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Residues in contact with ALA 261 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    257C  THR*     2.9    15.7    +      -       +      +
    258C  ALA*     3.0    14.1    +      -       -      +
    260C  SER*     1.3    76.7    +      -       -      +
    262C  GLY*     1.3    63.2    +      -       -      +
    264C  ASN*     3.9     4.6    -      -       -      +
    265C  SER*     3.1    26.0    +      -       -      -
    219D  GLN*     5.7     2.5    -      -       -      -
----------------------------------------------------------
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Residues in contact with GLY 262 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    258C  ALA      3.0    12.3    +      -       -      -
    259C  GLN*     3.1     5.6    +      -       -      -
    260C  SER      3.1     0.6    -      -       -      -
    261C  ALA*     1.3    75.4    -      -       -      +
    263C  ILE*     1.3    62.7    +      -       -      +
    265C  SER*     2.6    24.7    +      -       -      -
    266C  GLN*     3.9    11.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 263 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    137C  TYR*     4.1    29.6    +      -       +      +
    215C  PHE*     5.0    18.6    -      -       +      -
    216C  TYR*     5.4     5.4    -      -       +      -
    219C  GLN*     4.8    13.2    -      -       +      +
    220C  LEU*     3.8    28.7    -      -       +      -
    259C  GLN*     3.3    14.7    +      -       +      +
    260C  SER*     3.2     7.7    +      -       -      +
    262C  GLY*     1.3    74.4    -      -       -      +
    264C  ASN*     1.3    65.0    +      -       -      +
    265C  SER      3.1     1.0    +      -       -      -
    266C  GLN*     3.3    22.5    +      -       -      +
    267C  LEU*     3.8    12.2    -      -       +      +
    276C  ILE*     4.3    18.6    -      -       +      -
    280C  ILE*     6.0     0.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with ASN 264 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    260C  SER*     2.8    40.3    +      -       -      +
    261C  ALA*     3.9     4.5    -      -       -      +
    263C  ILE*     1.3    74.3    -      -       -      +
    265C  SER*     1.3    60.8    +      -       -      +
    266C  GLN      3.3     0.4    -      -       -      -
    267C  LEU*     3.4    35.8    +      -       -      +
    274C  LYS*     4.3     6.9    +      -       -      -
    276C  ILE*     5.1     5.5    -      -       -      +
    277C  ASP*     4.1    13.1    +      -       -      +
    280C  ILE*     5.6     3.0    -      -       -      +
    215D  PHE*     4.9    10.5    -      -       +      -
    219D  GLN*     3.0    43.8    +      -       +      +
----------------------------------------------------------
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Residues in contact with SER 265 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     45C  VAL*     5.3     2.1    -      -       -      +
    261C  ALA      3.1    14.9    +      -       -      -
    262C  GLY*     2.6    21.2    +      -       -      -
    264C  ASN*     1.3    76.0    -      -       -      +
    266C  GLN*     1.3    64.8    +      -       -      +
    267C  LEU      3.2     7.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLN 266 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    265B  SER*     5.7    10.3    +      -       -      +
     44C  VAL*     4.8     5.7    -      -       -      +
     45C  VAL*     3.5    18.1    -      -       -      +
    137C  TYR*     5.1     7.4    +      -       -      +
    215C  PHE*     5.4    13.0    -      -       -      -
    216C  TYR*     5.7     0.5    +      -       -      -
    262C  GLY      4.1    10.4    +      -       -      +
    263C  ILE*     3.3    14.7    +      -       -      +
    265C  SER*     1.3    85.8    +      -       -      +
    267C  LEU*     1.3    66.1    +      -       +      +
    268C  PRO*     4.4     0.5    -      -       -      +
----------------------------------------------------------
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A short description of the analytical approach
The contact analysis used in this page is based upon the approach developed in: Sobolev V., Wade R.C., Vriend G. and Edelman M. PROTEINS (1996) 25, 120-129. Contact legitimacy depends on the hydrophobic-hydrophilic properties of the contacting atoms. In order to define it, for each inter-atomic contact, eight atom classes have been introduced:


   I  Hydrophilic      - N and O that can donate and accept hydrogen bonds
                         (e.g., oxygen of hydroxyl group of Ser. or Thr)
  II  Acceptor         - N or O that can only accept a hydrogen bond
 III  Donor            - N that can only donate a hydrogen bond
  IV  Hydrophobic      - Cl, Br, I and all C atoms that are not in
                         aromatic rings and do not have a covalent bond to
                         a N or O atom
   V  Aromatic         - C in aromatic rings irrespective of any other 
                         bonds formed by the atom
  VI  Neutral          - C atoms that have a covalent bond to at least one
                         atom of class I or two or more atoms from class II
                         or III; atoms; S, F, P, and metal atoms in all cases
 VII  Neutral-donor    - C atoms that have a covalent bond with only one
                         atom of class III
VIII  Neutral-acceptor - C atoms that have a covalent bond with only 
                         one atom of class II
For each pair of contacts the state of legitimacy is shown below:

Legend:
+, legitimate
-, illegitimate
------------------------------------------------------------
  Atomic class           I  II  III   IV   V   VI  VII  VIII
------------------------------------------------------------
   I  (Hydrophilic)      +   +    +    -   +   +    +    +
  II  (Acceptor)         +   -    +    -   +   +    +    -
 III  (Donor)            +   +    -    -   +   +    -    +
  IV  (Hydrophobic)      -   -    -    +   +   +    +    +
   V  (Aromatic)         +   +    +    +   +   +    +    +
  VI  (Neutral)          +   +    +    +   +   +    +    +
 VII  (Neutral-donor)    +   +    -    +   +   +    -    +
VIII  (Neutral-acceptor) +   -    +    +   +   +    +    -
------------------------------------------------------------
Warning!
Atom classes for heterogroups are automatically assigned based on the atomic coordinates. However, in three cases (see below) the automatic assignment is currently ambiguous. In these cases, the user is advised to manually analyse the full list of contacts using LPC software.
1. Carbon atoms belonging to a 4-, 5- or 6-member ring are 
   considered "aromatic" (Class V) if the ring is approximately
   planar, and "hydrophobic" (Class IV) or "neutral" (Classes
   VI, VII, VIII) if the ring is non-planar.
2. The oxygen atom of a carbonyl or hydroxy group is considered
   "hydroxy" (Class I) if the CO bond is longer than 1.29 Å, and
   "carbonyl" (Class II) if shorter.
3. All nitrogen atoms are considered "hydrophilic" (Class I).

Please E-mail any questions and/or suggestions concerning this page to Vladimir.Sobolev@weizmann.ac.il