Contacts of the helix formed by residues 258 - 286 (chain A) in PDB entry 1GEY


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 SER 258 (chain A).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     66A  ASN*     4.4     6.5    -      -       -      +
    254A  ALA      3.4    10.3    +      -       -      -
    255A  GLN*     2.8    22.0    +      -       -      -
    256A  ALA      3.4     0.4    -      -       -      -
    257A  LEU*     1.3    80.6    -      -       -      +
    259A  PRO*     1.3    67.2    -      -       -      +
    260A  GLN*     3.1    25.0    +      -       -      -
    261A  GLY      2.8    25.6    +      -       -      -
    262A  ILE*     3.0    11.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with PRO 259 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     66A  ASN*     5.9     1.8    -      -       -      +
    257A  LEU      4.6     0.4    -      -       -      +
    258A  SER*     1.3    86.6    -      -       -      +
    260A  GLN*     1.3    79.1    +      -       +      +
    262A  ILE*     3.5    12.8    +      -       +      +
    263A  VAL*     3.1    27.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLN 260 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    258A  SER*     3.1    21.2    +      -       -      -
    259A  PRO*     1.3   100.8    -      -       +      +
    261A  GLY*     1.3    63.5    +      -       -      +
    263A  VAL*     3.3     9.9    +      -       -      +
    264A  ALA*     3.1    22.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLY 261 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     45A  PHE*     6.3     0.9    -      -       -      -
    255A  GLN      4.3     2.7    -      -       -      -
    256A  ALA*     3.5    24.0    -      -       -      +
    258A  SER*     2.8    15.5    +      -       -      -
    260A  GLN*     1.3    81.5    -      -       -      +
    262A  ILE*     1.3    56.0    +      -       -      +
    264A  ALA*     3.5     6.1    +      -       -      +
    265A  MET*     3.0    26.9    +      -       -      +
    268A  ARG*     4.6     4.0    +      -       -      -
----------------------------------------------------------
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Residues in contact with ILE 262 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     66A  ASN      4.9     1.1    -      -       -      +
     70A  TYR*     3.7    51.6    -      -       +      -
    216A  PHE*     4.7     5.4    -      -       +      -
    256A  ALA      4.5     3.4    -      -       -      +
    257A  LEU*     3.5    27.4    -      -       +      +
    258A  SER      3.0    11.3    +      -       -      +
    259A  PRO*     3.9    11.2    -      -       +      +
    260A  GLN      3.3     0.2    -      -       -      -
    261A  GLY*     1.3    74.8    -      -       -      +
    263A  VAL*     1.3    65.1    +      -       +      +
    265A  MET*     3.6     8.7    +      -       +      +
    266A  ARG*     3.2    48.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 263 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    259A  PRO      3.1    17.6    +      -       -      +
    260A  GLN*     3.5    11.0    -      -       -      +
    261A  GLY      3.2     0.4    -      -       -      -
    262A  ILE*     1.3    76.7    -      -       +      +
    264A  ALA*     1.3    64.6    +      -       -      +
    266A  ARG*     3.3    13.4    +      -       -      +
    267A  GLU*     3.0    37.4    +      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 264 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     43A  VAL*     6.4     0.2    -      -       +      -
    260A  GLN      3.1    16.5    +      -       -      +
    261A  GLY*     3.8     7.0    -      -       -      +
    263A  VAL*     1.3    74.2    -      -       -      +
    265A  MET*     1.3    65.5    +      -       -      +
    267A  GLU*     3.2    22.4    +      -       -      +
    268A  ARG*     3.2    30.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with MET 265 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     70A  TYR*     3.4    41.3    -      -       +      +
    189A  GLU*     3.8    14.1    -      -       +      +
    215A  ALA*     4.1    10.3    -      -       -      +
    216A  PHE*     3.8    32.5    -      -       +      -
    261A  GLY      3.0    18.6    +      -       -      +
    262A  ILE*     3.6     7.2    -      -       +      +
    263A  VAL      3.2     0.4    -      -       -      -
    264A  ALA*     1.3    76.5    -      -       -      +
    266A  ARG*     1.3    75.1    +      -       +      +
    268A  ARG*     2.9    36.4    +      -       -      +
    269A  VAL*     3.0    31.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 266 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     70A  TYR*     4.4    16.2    +      -       -      -
    192A  PRO*     6.3     0.4    -      -       -      +
    262A  ILE*     3.2    37.2    +      -       -      +
    263A  VAL*     3.3    14.2    +      -       -      +
    265A  MET*     1.3    88.7    -      -       +      +
    267A  GLU*     1.3    68.9    +      -       -      +
    269A  VAL*     3.3     7.2    +      -       +      +
    270A  ALA*     3.0    24.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 267 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    263A  VAL*     3.0    34.1    +      -       +      +
    264A  ALA*     3.3    16.4    -      -       -      +
    265A  MET      3.1     0.2    -      -       -      -
    266A  ARG*     1.3    80.2    -      -       -      +
    268A  ARG*     1.3    58.8    +      -       +      +
    270A  ALA*     3.3     7.5    +      -       -      +
    271A  GLN*     3.0    42.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 268 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     39A  TYR*     3.6    43.5    -      -       +      +
     43A  VAL*     3.7    28.6    -      -       -      +
     45A  PHE*     5.9     4.4    -      -       -      -
    190A  PHE*     5.6     0.2    -      -       -      -
    215A  ALA*     3.0    23.3    +      -       -      +
    216A  PHE*     2.9    38.2    +      -       -      +
    217A  ALA*     3.7     3.6    -      -       -      +
    218A  LEU*     5.6     0.6    -      -       -      +
    256A  ALA*     5.8     1.4    +      -       -      +
    261A  GLY      4.6     2.8    +      -       -      -
    264A  ALA*     3.3    32.0    +      -       -      +
    265A  MET*     2.9    27.7    +      -       -      +
    267A  GLU*     1.3    75.7    -      -       +      +
    269A  VAL*     1.3    65.4    +      -       -      +
    271A  GLN*     3.4    13.4    +      -       -      +
    272A  ILE*     3.1    29.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 269 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    189A  GLU*     3.4    27.8    -      -       +      +
    190A  PHE*     4.0    16.8    -      -       +      +
    192A  PRO*     5.9     0.9    -      -       +      -
    215A  ALA*     3.8    18.2    -      -       +      -
    265A  MET*     3.0    35.6    +      -       -      +
    266A  ARG*     3.6    10.3    -      -       +      +
    268A  ARG*     1.3    74.1    -      -       -      +
    270A  ALA*     1.3    65.0    +      -       -      +
    272A  ILE*     3.2     3.5    +      -       -      +
    273A  ILE*     2.9    43.1    +      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 270 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    266A  ARG      3.0    13.9    +      -       -      +
    267A  GLU*     3.4    12.1    -      -       -      +
    269A  VAL*     1.3    77.3    -      -       -      +
    271A  GLN*     1.3    62.7    +      -       +      +
    273A  ILE*     3.3     8.0    +      -       -      +
    274A  ALA*     3.0    25.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLN 271 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     39A  TYR*     3.2    24.2    +      -       -      +
    267A  GLU*     3.0    34.6    +      -       -      +
    268A  ARG*     3.6     8.5    +      -       -      +
    269A  VAL      3.3     0.2    -      -       -      -
    270A  ALA*     1.3    77.7    -      -       +      +
    272A  ILE*     1.3    61.7    +      -       +      +
    274A  ALA*     3.7     5.6    +      -       -      +
    275A  GLU*     3.1    27.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 272 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     39A  TYR*     4.0    26.2    -      -       +      -
     40A  PRO*     4.1    11.7    -      -       +      -
    190A  PHE*     3.7    17.5    -      -       +      -
    268A  ARG      3.1    19.5    +      -       -      +
    269A  VAL      3.2     3.8    +      -       -      +
    271A  GLN*     1.3    78.0    -      -       +      +
    273A  ILE*     1.3    61.3    +      -       -      +
    275A  GLU*     3.3     3.1    +      -       -      +
    276A  ARG*     2.8    27.9    +      -       -      +
    297A  THR      4.7     1.6    -      -       -      +
    298A  ASN*     3.6    35.4    -      -       +      +
    338A  VAL*     3.8    26.8    -      -       +      +
    339A  GLY      4.2    10.5    -      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 273 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    190A  PHE*     3.6    30.5    -      -       +      +
    269A  VAL*     2.9    34.5    +      -       +      +
    270A  ALA*     3.7     6.7    -      -       -      +
    272A  ILE*     1.3    77.1    -      -       -      +
    274A  ALA*     1.3    64.6    +      -       -      +
    276A  ARG*     3.2    37.2    +      -       -      +
    277A  GLU*     3.0    29.4    +      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 274 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    270A  ALA      3.0    16.9    +      -       -      +
    271A  GLN*     3.9     6.3    -      -       -      +
    273A  ILE*     1.3    77.0    -      -       -      +
    275A  GLU*     1.3    63.8    +      -       -      +
    277A  GLU*     3.2    10.1    +      -       -      +
    278A  TYR*     3.1    20.1    +      -       -      +
    341A  ARG*     4.9     2.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 275 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    271A  GLN      3.1    16.5    +      -       -      +
    272A  ILE*     3.7     4.7    -      -       +      +
    273A  ILE      3.3     0.2    -      -       -      -
    274A  ALA*     1.3    75.8    -      -       -      +
    276A  ARG*     1.3    66.3    +      -       -      +
    278A  TYR*     3.2    12.5    +      -       -      +
    279A  LEU*     3.0    22.5    +      -       -      +
    338A  VAL*     3.7    11.4    -      -       +      -
    339A  GLY      3.6    22.0    -      -       -      +
    340A  THR*     4.9     0.2    -      -       -      -
    341A  ARG*     2.9    54.7    +      -       -      +
    344A  SER*     2.8    29.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 276 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    190A  PHE*     4.8     1.6    +      -       -      +
    272A  ILE      2.8    22.8    +      -       -      +
    273A  ILE*     3.2    37.0    +      -       -      +
    275A  GLU*     1.3    72.4    -      -       -      +
    277A  GLU*     1.3    79.5    +      -       -      +
    279A  LEU*     3.3     4.5    +      -       -      +
    280A  ILE*     3.0    45.1    +      -       +      +
    295A  SER*     3.2    37.8    +      -       -      +
    296A  GLU*     3.5    13.5    +      -       -      +
    297A  THR      2.9    38.7    +      -       -      +
    299A  TYR      4.8     0.4    -      -       -      -
    300A  ILE*     4.2     4.7    -      -       +      -
    338A  VAL*     3.7    24.9    -      -       +      +
----------------------------------------------------------
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Residues in contact with GLU 277 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    273A  ILE*     3.0    19.2    +      -       +      +
    274A  ALA*     3.2     9.8    +      -       -      +
    276A  ARG*     1.3   106.3    +      -       -      +
    278A  TYR*     1.3    65.5    +      -       -      +
    280A  ILE*     3.5    16.2    +      -       -      +
    281A  ALA*     3.2    22.9    +      -       -      +
    294A  ASP*     5.1     5.1    -      -       -      +
    295A  SER      5.0     0.9    -      -       -      +
----------------------------------------------------------
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Residues in contact with TYR 278 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    274A  ALA      3.1     9.8    +      -       -      +
    275A  GLU*     3.2    15.7    +      -       -      +
    277A  GLU*     1.3    77.8    -      -       -      +
    279A  LEU*     1.3    63.9    +      -       -      +
    281A  ALA*     3.3     6.8    +      -       +      +
    282A  ALA*     3.1    26.8    +      -       +      +
    341A  ARG*     3.5    59.0    -      -       -      +
    344A  SER*     4.6     3.8    -      -       -      -
    345A  GLN*     3.5    22.9    +      -       +      +
    348A  ILE*     3.8    23.7    -      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 279 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     34A  LEU*     6.3     0.7    -      -       +      -
    275A  GLU      3.0    15.3    +      -       -      +
    276A  ARG      3.3     5.1    +      -       -      +
    278A  TYR*     1.3    81.4    -      -       -      +
    280A  ILE*     1.3    56.1    +      -       -      +
    282A  ALA*     4.7     1.8    -      -       -      -
    283A  LEU*     3.1    47.5    +      -       +      +
    300A  ILE*     3.8    20.4    -      -       +      -
    336A  ILE*     4.3    20.9    -      -       +      -
    337A  THR      4.7     0.7    -      -       -      +
    338A  VAL*     4.3    22.7    -      -       +      -
    344A  SER*     3.8    42.0    -      -       -      +
    347A  VAL*     5.3     7.6    -      -       +      -
    348A  ILE*     4.4    11.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with ILE 280 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    276A  ARG*     3.0    38.3    +      -       +      +
    277A  GLU*     3.9    22.2    -      -       -      +
    278A  TYR      3.2     0.4    -      -       -      -
    279A  LEU*     1.3    75.2    -      -       -      +
    281A  ALA*     1.3    66.7    +      -       -      +
    283A  LEU*     3.5     1.6    +      -       -      +
    284A  LYS*     3.3    39.8    +      -       +      +
    292A  VAL*     4.1    20.5    -      -       +      +
    293A  PHE      4.8     6.1    -      -       -      +
    294A  ASP*     4.8     9.6    -      -       -      +
    295A  SER      4.8    14.1    -      -       -      +
    300A  ILE*     3.4    23.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 281 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    277A  GLU      3.2    17.7    +      -       -      +
    278A  TYR*     3.3     8.5    +      -       +      +
    280A  ILE*     1.3    80.3    -      -       -      +
    282A  ALA*     1.3    62.1    +      -       -      +
    284A  LYS*     3.5    17.5    +      -       -      +
    285A  GLU*     3.8    15.0    -      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 282 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    278A  TYR*     3.1    25.4    +      -       +      +
    279A  LEU      4.1     2.5    -      -       -      +
    281A  ALA*     1.3    76.8    -      -       -      +
    283A  LEU*     1.3    62.1    +      -       -      +
    285A  GLU*     3.3    27.8    +      -       -      +
    286A  ILE*     3.8    12.4    +      -       -      +
    348A  ILE*     3.6    35.8    -      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 283 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    279A  LEU*     3.1    39.2    +      -       +      +
    280A  ILE*     4.0     2.9    -      -       -      +
    281A  ALA      3.4     0.2    -      -       -      -
    282A  ALA*     1.3    73.6    -      -       +      +
    284A  LYS*     1.3    64.6    +      -       -      +
    286A  ILE*     3.2    17.6    +      -       +      -
    289A  VAL*     3.3    31.4    -      -       +      +
    292A  VAL*     3.8    28.7    -      -       +      -
    300A  ILE*     4.5    10.8    -      -       +      -
    302A  ALA*     4.6     7.9    -      -       +      -
    304A  PHE*     5.1     1.3    -      -       +      -
    336A  ILE*     4.1    24.9    -      -       +      -
    347A  VAL*     5.4     1.6    -      -       +      -
    348A  ILE*     5.5     3.6    -      -       +      -
    351A  LEU*     3.5    31.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with LYS 284 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    280A  ILE*     3.3    29.6    +      -       +      +
    281A  ALA*     3.7    11.9    -      -       -      +
    282A  ALA      3.3     0.6    -      -       -      -
    283A  LEU*     1.3    77.5    -      -       -      +
    285A  GLU*     1.3    61.4    +      -       +      +
    286A  ILE      3.4     5.4    +      -       -      +
    289A  VAL*     4.8     4.6    -      -       -      +
    292A  VAL*     4.0    30.5    -      -       +      +
----------------------------------------------------------
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Residues in contact with GLU 285 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    281A  ALA*     3.8    17.5    -      -       -      +
    282A  ALA*     3.5    14.9    -      -       -      +
    283A  LEU      3.2     0.8    -      -       -      -
    284A  LYS*     1.3    77.7    -      -       +      +
    286A  ILE*     1.3    61.4    +      -       +      +
    287A  PRO*     3.5     6.6    -      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 286 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    282A  ALA      3.9    15.3    -      -       -      +
    283A  LEU*     3.2    18.8    +      -       +      +
    284A  LYS      4.0     2.5    -      -       -      +
    285A  GLU*     1.3    78.6    -      -       +      +
    287A  PRO*     1.3    68.2    -      -       +      +
    288A  CYS*     3.5    29.8    -      -       -      -
    289A  VAL*     3.1    34.8    +      -       +      +
    348A  ILE*     4.1    23.6    -      -       +      +
    351A  LEU*     3.8    40.4    -      -       +      +
----------------------------------------------------------
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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