Contacts of the helix formed by residues 241 - 267 (chain A) in PDB entry 4R1Z


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

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

Legend:
Dist - nearest distance (Å) between atoms of two residues
Surf - contact surface area (Å2) between two residues
HB   - hydrophilic-hydrophilic contact (hydrogen bond)
Arom - aromatic-aromatic contact
Phob - hydrophobic-hydrophobic contact
DC   - hydrophobic-hydrophilic contact (destabilizing contact)
+/-  - indicates presence/absence of a specific contacts
*    - indicates residues forming contacts  by their side chain
       (including CA atoms)
Residues in contact with ASP 241 (chain A).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    221A  THR*     3.4    25.0    -      -       -      +
    239A  ASN      5.4     0.2    -      -       -      -
    240A  LYS*     1.3    95.3    +      -       -      +
    242A  LEU*     1.3    72.0    +      -       -      +
    243A  THR*     3.0    35.3    +      -       -      +
    244A  ILE*     3.5    27.3    -      -       +      +
    245A  LEU      3.6     0.3    +      -       -      -
----------------------------------------------------------
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Residues in contact with LEU 242 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    113A  VAL*     4.5    23.3    -      -       +      -
    114A  THR*     5.2     8.1    -      -       +      -
    117A  LEU*     5.5     4.9    -      -       +      -
    221A  THR*     6.0     0.7    -      -       -      -
    240A  LYS*     3.4    22.0    -      -       +      +
    241A  ASP*     1.3    82.9    +      -       -      +
    243A  THR*     1.3    65.2    +      -       -      +
    244A  ILE      3.3     0.2    -      -       -      -
    245A  LEU*     3.7    21.4    -      -       +      +
    246A  ARG*     3.2    44.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with THR 243 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    241A  ASP*     3.0    30.0    +      -       -      +
    242A  LEU*     1.3    84.0    -      -       -      +
    244A  ILE*     1.3    74.0    +      -       +      +
    246A  ARG*     3.8     6.3    +      -       -      +
    247A  GLN*     3.4    24.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 244 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    217A  GLY*     4.6    14.6    -      -       -      +
    220A  ASP*     6.0     0.9    -      -       +      -
    221A  THR*     3.6    22.0    -      -       +      -
    241A  ASP*     3.5    22.6    +      -       +      +
    243A  THR*     1.3    90.2    -      -       +      +
    245A  LEU*     1.3    70.3    +      -       -      +
    247A  GLN*     3.1    19.2    +      -       -      +
    248A  CYS*     3.0    27.3    +      -       -      -
----------------------------------------------------------
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Residues in contact with LEU 245 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    114A  THR*     4.5    20.6    -      -       +      +
    117A  LEU*     3.7    38.6    -      -       +      -
    118A  LEU*     5.3     1.3    -      -       +      -
    217A  GLY      5.1     0.4    -      -       -      -
    218A  ILE*     4.1    32.1    -      -       +      +
    221A  THR*     3.1    29.2    -      -       -      +
    222A  VAL*     4.8     6.3    -      -       +      -
    241A  ASP      3.6     1.2    +      -       -      -
    242A  LEU*     3.7    22.7    -      -       +      -
    244A  ILE*     1.3    82.9    -      -       -      +
    246A  ARG*     1.3    61.9    +      -       -      +
    248A  CYS*     3.1     8.7    +      -       -      +
    249A  ILE*     2.9    33.0    +      -       +      +
----------------------------------------------------------
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Residues in contact with ARG 246 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    117A  LEU*     3.7    23.7    -      -       +      +
    242A  LEU*     3.2    52.1    +      -       -      +
    243A  THR*     4.0     7.4    -      -       -      +
    244A  ILE      3.2     0.2    -      -       -      -
    245A  LEU*     1.3    81.2    -      -       -      +
    247A  GLN*     1.3    61.9    +      -       -      +
    249A  ILE*     3.2    11.7    +      -       +      +
    250A  SER*     3.1    24.5    +      -       -      -
----------------------------------------------------------
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Residues in contact with GLN 247 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    243A  THR*     3.4    12.6    +      -       -      +
    244A  ILE*     3.1    28.4    +      -       +      +
    246A  ARG*     1.3    78.6    -      -       -      +
    248A  CYS*     1.3    59.1    +      -       -      +
    250A  SER*     2.8    24.2    +      -       -      -
    251A  ILE*     3.4    19.1    +      -       +      +
----------------------------------------------------------
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Residues in contact with CYS 248 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    213A  GLN      5.0     0.4    -      -       -      -
    214A  TYR*     3.4    34.8    -      -       +      +
    217A  GLY*     3.8    22.0    -      -       -      -
    218A  ILE*     3.4    23.3    -      -       +      -
    244A  ILE*     3.0    22.3    +      -       -      -
    245A  LEU*     3.5     3.6    -      -       -      +
    247A  GLN*     1.3    76.3    -      -       -      +
    249A  ILE*     1.3    67.3    +      -       -      +
    251A  ILE*     3.0    19.1    +      -       -      +
    252A  ARG*     3.0    12.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 249 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    117A  LEU*     3.9    22.9    -      -       +      +
    118A  LEU*     3.7    33.9    -      -       +      +
    218A  ILE*     3.7    23.6    -      -       +      -
    245A  LEU*     2.9    35.2    +      -       +      +
    246A  ARG*     3.5    11.4    -      -       +      +
    248A  CYS*     1.3    75.9    -      -       -      +
    250A  SER*     1.3    59.2    +      -       -      +
    252A  ARG*     3.3    11.1    -      -       -      +
    253A  ASP*     2.8    45.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with SER 250 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    246A  ARG      3.1    11.7    +      -       -      -
    247A  GLN*     2.8    17.4    +      -       -      +
    249A  ILE*     1.3    76.3    -      -       -      +
    251A  ILE*     1.3    71.9    +      -       -      +
    253A  ASP*     3.0     9.3    +      -       -      -
    254A  LYS*     2.8    48.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 251 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    210A  SER*     4.5    17.7    -      -       -      +
    213A  GLN*     6.4     1.6    -      -       +      -
    214A  TYR*     3.5    33.9    -      -       +      -
    247A  GLN*     3.5    20.9    -      -       +      +
    248A  CYS*     3.0     9.5    +      -       -      +
    250A  SER*     1.3    83.5    +      -       -      +
    252A  ARG*     1.3    62.4    +      -       -      +
    254A  LYS*     3.4    13.1    +      -       -      +
    255A  LEU*     3.0    21.2    +      -       +      +
----------------------------------------------------------
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Residues in contact with ARG 252 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    117A  LEU      4.5     0.4    +      -       -      -
    118A  LEU*     2.9    39.9    +      -       -      +
    120A  ARG*     4.4     2.2    -      -       -      +
    214A  TYR*     3.5    41.8    -      -       +      +
    218A  ILE*     4.9     3.4    -      -       +      -
    248A  CYS      3.0     9.1    +      -       -      +
    249A  ILE*     3.3    22.7    +      -       -      +
    251A  ILE*     1.3    78.4    -      -       -      +
    253A  ASP*     1.3    87.4    +      -       -      +
    255A  LEU*     3.0     4.4    +      -       -      +
    256A  LEU*     3.0    38.3    +      -       +      +
    305A  MET*     3.4    28.6    -      -       -      +
    308A  GLY*     4.7    12.1    -      -       -      -
    309A  ASP*     5.7     0.8    +      -       -      -
    311A  PHE*     5.9     2.2    -      -       +      -
    601A  AER      4.8    21.0    -      -       -      +
----------------------------------------------------------
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Residues in contact with ASP 253 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    120A  ARG*     2.6    37.8    +      -       -      +
    249A  ILE*     2.8    28.4    +      -       -      +
    250A  SER*     3.0    12.5    +      -       -      +
    252A  ARG*     1.3   101.6    +      -       -      +
    254A  LYS*     1.3    58.6    +      -       +      +
    256A  LEU*     3.4     7.0    +      -       -      +
    257A  GLN*     2.8    32.0    +      -       -      +
    304A  LEU*     5.8     0.3    -      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 254 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    250A  SER*     2.8    45.7    +      -       -      +
    251A  ILE*     3.8    11.2    -      -       +      +
    253A  ASP*     1.3    71.2    -      -       +      +
    255A  LEU*     1.3    67.5    +      -       -      +
    257A  GLN*     3.7     7.2    -      -       -      +
    258A  LYS*     2.9    25.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 255 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    197A  PHE*     4.6     2.9    -      -       +      -
    201A  TYR*     4.4     4.7    -      -       -      +
    207A  GLU*     3.5    44.4    -      -       +      +
    210A  SER*     4.5     4.3    -      -       -      +
    211A  MET*     4.3    11.0    -      -       +      -
    214A  TYR*     4.0    22.0    -      -       +      +
    251A  ILE*     3.0    13.4    +      -       +      +
    252A  ARG*     3.0    12.0    +      -       -      +
    254A  LYS*     1.3    79.2    -      -       -      +
    256A  LEU*     1.3    74.6    +      -       +      +
    258A  LYS*     3.4     5.9    +      -       -      +
    259A  LYS*     3.2    27.6    +      -       +      +
    311A  PHE*     4.0    22.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 256 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    120A  ARG*     5.4     2.0    -      -       -      +
    197A  PHE*     3.9    26.0    -      -       +      -
    252A  ARG*     3.0    38.7    +      -       +      +
    253A  ASP*     3.7     8.7    -      -       -      +
    255A  LEU*     1.3    86.1    -      -       +      +
    257A  GLN*     1.3    53.0    +      -       -      +
    259A  LYS*     3.0     7.5    +      -       -      +
    260A  TYR*     2.7    36.0    +      -       -      +
    276A  LEU*     5.4     0.7    -      -       -      +
    304A  LEU*     3.3    45.1    -      -       +      +
    305A  MET*     5.1     2.0    -      -       -      -
    307A  VAL*     4.8     1.8    -      -       +      -
    308A  GLY*     4.1    21.3    -      -       -      +
    311A  PHE*     4.5     9.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLN 257 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    120A  ARG*     5.2     1.6    +      -       -      -
    253A  ASP      2.8    23.7    +      -       -      +
    254A  LYS*     3.3     8.3    +      -       -      +
    256A  LEU*     1.3    72.8    -      -       -      +
    258A  LYS*     1.3    57.1    +      -       -      +
    260A  TYR*     3.6    11.5    -      -       -      +
    261A  GLU*     3.0    47.9    +      -       +      +
    300A  GLU*     3.2    27.1    +      -       -      +
    304A  LEU*     3.3    16.9    -      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 258 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    207A  GLU*     4.3    18.5    +      -       -      +
    254A  LYS      2.9    18.1    +      -       -      +
    255A  LEU*     3.6     4.7    -      -       -      +
    257A  GLN*     1.3    75.6    -      -       -      +
    259A  LYS*     1.3    61.0    +      -       +      +
    260A  TYR      3.2     0.2    +      -       -      -
    261A  GLU*     3.2     4.4    +      -       -      +
    262A  GLU*     2.9    62.2    +      -       +      +
----------------------------------------------------------
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Residues in contact with LYS 259 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    193A  CYS*     4.6     0.8    -      -       -      -
    197A  PHE*     3.9    53.7    -      -       +      +
    199A  SER*     3.1    30.7    +      -       -      +
    201A  TYR*     4.2     6.8    +      -       -      -
    207A  GLU*     3.3    31.1    +      -       -      +
    255A  LEU*     3.2    15.7    +      -       +      +
    256A  LEU      3.0     6.5    +      -       -      +
    258A  LYS*     1.3    79.9    -      -       +      +
    260A  TYR*     1.3    62.8    +      -       -      +
    262A  GLU*     3.7    18.2    +      -       -      +
    263A  HIS*     2.9    35.1    +      -       +      +
    276A  LEU*     3.9     2.0    -      -       +      +
----------------------------------------------------------
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Residues in contact with TYR 260 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    256A  LEU      2.7    19.7    +      -       -      +
    257A  GLN*     3.6    19.3    -      -       -      +
    258A  LYS      3.1     0.2    -      -       -      -
    259A  LYS*     1.3    73.4    -      -       -      +
    261A  GLU*     1.3    75.5    +      -       -      +
    263A  HIS*     3.0    13.7    +      -       -      +
    264A  LYS*     3.2    49.7    +      -       -      +
    276A  LEU*     4.2    13.4    -      -       +      +
    280A  LEU*     3.7    24.2    -      -       +      +
    283A  LYS*     3.9    17.7    -      -       +      +
    300A  GLU*     3.6    37.2    +      -       +      +
    303A  VAL*     4.2    20.6    -      -       +      -
    304A  LEU*     3.8    23.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLU 261 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    257A  GLN*     3.0    35.0    +      -       +      +
    258A  LYS*     4.0     3.8    -      -       -      +
    260A  TYR*     1.3    93.6    -      -       +      +
    262A  GLU*     1.3    61.8    +      -       +      +
    263A  HIS      3.4     0.2    +      -       -      -
    264A  LYS*     3.5    22.2    +      -       -      +
    265A  VAL*     3.2    30.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 262 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    258A  LYS*     2.9    53.5    +      -       +      +
    259A  LYS*     3.7    30.1    +      -       -      +
    260A  TYR      3.1     0.2    +      -       -      -
    261A  GLU*     1.3    74.7    -      -       +      +
    263A  HIS*     1.3    68.3    +      -       +      +
    265A  VAL*     3.4    20.3    -      -       -      +
    266A  THR*     2.9    18.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with HIS 263 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    197A  PHE*     3.3    27.3    +      -       -      +
    198A  ASN*     5.1     0.4    -      -       +      -
    259A  LYS*     2.9    30.7    -      -       +      +
    260A  TYR      3.0     4.6    +      -       -      +
    262A  GLU*     1.3    85.4    -      -       +      +
    264A  LYS*     1.3    68.7    +      -       -      +
    266A  THR*     3.2     3.1    +      -       -      -
    267A  TYR*     2.8    22.1    +      -       -      +
    273A  ARG*     3.2    24.5    +      -       -      +
    274A  ASP*     2.8    35.2    +      -       -      -
    276A  LEU*     3.9    13.7    -      -       +      +
    277A  ASP*     3.3    16.3    +      -       -      -
    280A  LEU*     3.9    14.8    -      -       +      -
----------------------------------------------------------
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Residues in contact with LYS 264 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    260A  TYR*     3.2    49.7    +      -       -      +
    261A  GLU*     3.5    29.3    +      -       -      +
    263A  HIS*     1.3    77.6    -      -       -      +
    265A  VAL*     1.3    64.7    +      -       +      +
    266A  THR      3.0     1.4    +      -       -      -
    267A  TYR*     3.0    21.5    +      -       -      +
    280A  LEU*     4.1    19.8    -      -       +      +
    283A  LYS*     6.0     0.9    -      -       -      -
    300A  GLU*     5.6     0.8    +      -       -      -
----------------------------------------------------------
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Residues in contact with VAL 265 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    261A  GLU*     3.2    22.7    -      -       -      +
    262A  GLU*     3.4    14.3    +      -       -      +
    263A  HIS      3.3     0.6    -      -       -      -
    264A  LYS*     1.3    76.4    -      -       +      +
    266A  THR*     1.3    74.6    +      -       +      +
    267A  TYR      3.4     0.4    -      -       -      +
----------------------------------------------------------
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Residues in contact with THR 266 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    262A  GLU      2.9    14.1    +      -       -      +
    263A  HIS*     3.3     3.1    +      -       -      -
    265A  VAL*     1.3    92.2    -      -       +      +
    267A  TYR*     1.3    66.4    +      -       -      +
    268A  SER*     3.5     6.1    +      -       -      -
    273A  ARG*     3.0    30.5    +      -       -      -
----------------------------------------------------------
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Residues in contact with TYR 267 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    263A  HIS      2.8    13.4    +      -       -      +
    264A  LYS*     3.0    17.7    +      -       -      +
    265A  VAL      3.4     0.6    -      -       -      +
    266A  THR*     1.3    79.5    -      -       -      +
    268A  SER*     1.3    65.7    +      -       -      +
    269A  ASP*     3.6    30.8    +      -       -      -
    271A  VAL      4.7     1.1    +      -       -      -
    272A  GLN*     6.0     0.2    -      -       -      +
    273A  ARG*     3.9     4.0    -      -       -      +
    277A  ASP*     3.8    47.3    +      -       +      -
    280A  LEU*     4.3    14.1    -      -       +      -
    281A  ARG*     3.3    36.8    +      -       +      +
    284A  ARG*     2.8    34.7    +      -       -      -
----------------------------------------------------------
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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