Contacts of the helix formed by residues 271 - 297 (chain B) in PDB entry 6GR2


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 271 (chain B).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    270B  VAL*     1.3    77.6    -      -       -      +
    272B  LYS*     1.3    54.0    +      -       -      +
    273B  GLU*     3.9     5.9    +      -       -      +
    274B  GLY*     3.0    22.2    +      -       -      -
    275B  PHE*     2.7    34.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 272 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    267B  ARG*     6.6     0.2    -      -       +      -
    271B  SER*     1.3    72.3    -      -       -      +
    273B  GLU*     1.3    63.9    +      -       -      +
    275B  PHE*     3.1     9.6    +      -       -      +
    276B  ARG*     3.0    32.9    +      -       +      +
    370C  GLU*     5.7     4.0    +      -       -      -
----------------------------------------------------------
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Residues in contact with GLU 273 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    238B  VAL*     5.5     1.7    -      -       -      +
    239B  ARG*     5.4     0.9    +      -       -      -
    242B  GLN*     3.1    28.8    +      -       -      +
    271B  SER*     3.3     5.6    +      -       -      +
    272B  LYS*     1.3    77.8    -      -       -      +
    274B  GLY*     1.3    63.4    +      -       -      +
    275B  PHE      3.3     0.3    +      -       -      -
    276B  ARG*     3.3    23.7    +      -       -      +
    277B  ARG*     3.1    53.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLY 274 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    242B  GLN*     4.5     8.0    +      -       -      -
    246B  VAL*     3.4    30.4    -      -       -      +
    270B  VAL*     4.4     0.9    -      -       -      -
    271B  SER*     3.0    21.2    +      -       -      -
    273B  GLU*     1.3    78.0    -      -       -      +
    275B  PHE*     1.3    60.9    +      -       -      +
    277B  ARG*     3.5     8.4    +      -       -      +
    278B  ALA*     3.2    18.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with PHE 275 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    260B  LEU*     6.1     0.2    -      -       +      -
    263B  LEU*     3.3    48.9    -      -       +      -
    264B  GLU*     4.1    13.5    -      -       +      -
    267B  ARG*     3.6    56.1    -      -       +      -
    270B  VAL*     3.7    16.5    -      -       +      +
    271B  SER      2.7    19.7    +      -       -      +
    272B  LYS*     3.1     9.6    +      -       -      +
    274B  GLY*     1.3    71.8    -      -       -      +
    276B  ARG*     1.3    68.9    +      -       +      +
    278B  ALA*     3.3     6.3    +      -       -      +
    279B  ARG*     2.9    52.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 276 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    272B  LYS*     3.0    21.7    +      -       +      +
    273B  GLU*     3.9    23.7    +      -       -      +
    275B  PHE*     1.3    80.4    -      -       +      +
    277B  ARG*     1.3    97.1    +      -       -      +
    279B  ARG*     3.2    23.4    +      -       -      +
    280B  HIS      3.2     8.8    +      -       -      -
    316B  ASP      3.5    14.7    +      -       -      -
    317B  ASP*     3.2    43.7    +      -       -      +
    319B  GLU*     3.8    18.9    +      -       -      -
----------------------------------------------------------
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Residues in contact with ARG 277 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    239B  ARG*     3.2    48.2    -      -       -      +
    242B  GLN*     3.4    27.1    +      -       +      +
    243B  CYS*     4.8     9.4    -      -       -      +
    246B  VAL*     5.7     0.9    -      -       +      -
    273B  GLU*     3.1    45.4    +      -       -      +
    274B  GLY*     3.7     6.7    -      -       -      +
    276B  ARG*     1.3   102.0    -      -       -      +
    278B  ALA*     1.3    62.2    +      -       -      +
    280B  HIS*     3.2    12.0    +      -       -      +
    281B  VAL*     3.3    16.4    +      -       -      +
    317B  ASP      2.7    31.2    +      -       -      -
    318B  TYR*     3.6    24.6    +      -       +      +
    319B  GLU*     3.8    15.8    +      -       -      -
----------------------------------------------------------
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Residues in contact with ALA 278 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    246B  VAL*     3.7    24.8    -      -       +      +
    255B  LEU*     3.8    24.0    -      -       +      +
    263B  LEU*     3.7    17.7    -      -       +      -
    274B  GLY      3.2    15.0    +      -       -      +
    275B  PHE*     3.3     4.2    +      -       -      +
    277B  ARG*     1.3    79.1    -      -       -      +
    279B  ARG*     1.3    63.2    +      -       -      +
    281B  VAL*     3.3     0.9    +      -       -      +
    282B  VAL*     3.0    29.2    +      -       +      +
----------------------------------------------------------
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Residues in contact with ARG 279 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    260B  LEU*     4.2    23.1    -      -       +      +
    263B  LEU*     3.5    12.7    -      -       +      +
    267B  ARG*     4.4    11.3    -      -       -      +
    275B  PHE*     2.9    44.0    +      -       +      +
    276B  ARG*     3.2    18.3    +      -       -      +
    278B  ALA*     1.3    77.9    -      -       -      +
    280B  HIS*     1.3    62.1    +      -       -      +
    282B  VAL*     4.3     1.8    -      -       -      +
    283B  GLY*     3.1    20.3    +      -       -      -
    317B  ASP*     2.8    36.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with HIS 280 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     43B  GLU      3.0    24.2    +      -       -      -
     44B  HIS*     4.2     1.1    -      -       +      +
    276B  ARG      3.2     2.8    +      -       -      -
    277B  ARG      3.2     8.3    +      -       -      +
    279B  ARG*     1.3    76.7    -      -       -      +
    281B  VAL*     1.3    63.0    +      -       +      +
    283B  GLY*     3.0     1.6    +      -       -      -
    284B  GLU*     2.6    59.7    +      -       +      +
    287B  ARG*     3.7     1.2    +      -       -      +
    313B  SER*     2.5    39.9    +      -       -      +
    314B  LEU*     3.2    32.9    -      -       +      +
    317B  ASP*     4.1    14.1    +      -       +      -
    318B  TYR*     3.5    33.4    -      +       +      -
----------------------------------------------------------
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Residues in contact with VAL 281 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     44B  HIS      3.9     8.5    -      -       -      +
     45B  THR*     4.5     3.1    -      -       +      -
     48B  ASN*     3.3    46.0    -      -       +      +
    243B  CYS*     3.9     1.1    -      -       -      -
    255B  LEU*     3.7    28.0    -      -       +      -
    277B  ARG      3.3    13.1    +      -       -      +
    278B  ALA      3.3     1.1    +      -       -      +
    280B  HIS*     1.3    79.5    -      -       +      +
    282B  VAL*     1.3    65.8    +      -       -      +
    284B  GLU*     3.1     3.6    +      -       -      +
    285B  ILE*     2.9    41.5    +      -       +      +
    318B  TYR*     3.8    17.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with VAL 282 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    255B  LEU*     3.7    20.4    -      -       +      +
    258B  VAL*     3.4    40.8    -      -       +      +
    259B  GLN*     3.9     1.3    -      -       -      -
    260B  LEU*     3.4    33.0    -      -       +      +
    263B  LEU*     4.8     6.3    -      -       +      -
    278B  ALA      3.0    19.1    +      -       -      +
    279B  ARG*     4.3     3.8    -      -       -      +
    281B  VAL*     1.3    75.5    -      -       -      +
    283B  GLY*     1.3    60.9    +      -       -      +
    285B  ILE*     3.6     9.0    +      -       -      +
    286B  ARG*     3.3    27.5    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLY 283 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    260B  LEU*     6.0     3.8    -      -       -      +
    279B  ARG      3.1    13.3    +      -       -      -
    280B  HIS      3.0     5.8    +      -       -      -
    282B  VAL*     1.3    77.8    -      -       -      +
    284B  GLU*     1.3    59.2    +      -       -      +
    286B  ARG*     3.4     6.4    +      -       -      +
    287B  ARG*     2.9    47.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 284 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     41B  ILE*     4.4     2.2    -      -       -      -
     42B  GLY*     2.8    15.3    +      -       -      -
     43B  GLU*     2.8    36.3    +      -       -      +
     45B  THR*     3.5    19.5    -      -       +      -
    280B  HIS*     2.6    33.1    +      -       +      +
    283B  GLY*     1.3    69.0    -      -       -      +
    285B  ILE*     1.3    61.2    +      -       -      +
    287B  ARG*     2.9    32.4    +      -       -      +
    288B  THR*     2.8    35.4    +      -       -      -
    310B  SER*     2.6    29.4    +      -       -      -
----------------------------------------------------------
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Residues in contact with ILE 285 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     45B  THR*     3.9    11.2    -      -       +      -
     48B  ASN      4.7     1.1    -      -       -      +
     50B  GLY*     3.7    27.4    -      -       -      +
     51B  LEU*     3.9    19.6    -      -       +      +
    255B  LEU      4.6     2.5    -      -       -      +
    256B  ARG*     4.1    39.9    -      -       -      +
    281B  VAL*     2.9    36.5    +      -       +      +
    282B  VAL*     3.8     6.5    -      -       -      +
    284B  GLU*     1.3    77.1    -      -       -      +
    286B  ARG*     1.3    65.5    +      -       +      +
    288B  THR*     3.4     5.8    +      -       -      -
    289B  ALA*     3.2    22.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 286 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    259B  GLN*     5.5     5.7    +      -       -      +
    260B  LEU*     4.6    31.3    -      -       -      +
    261B  GLU*     4.6    11.3    +      -       -      -
    282B  VAL*     3.3    17.1    +      -       +      +
    283B  GLY*     3.7     9.0    -      -       -      +
    284B  GLU      3.3     0.4    -      -       -      -
    285B  ILE*     1.3    79.4    -      -       +      +
    287B  ARG*     1.3    66.6    +      -       +      +
    288B  THR      3.4     0.2    +      -       -      -
    289B  ALA*     3.4     6.4    +      -       -      +
    290B  GLN*     3.0    46.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 287 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     41B  ILE*     4.1    12.1    -      -       +      -
    280B  HIS*     3.7     1.8    +      -       -      +
    283B  GLY*     2.9    28.7    +      -       -      +
    284B  GLU*     2.9    48.5    +      -       -      +
    286B  ARG*     1.3    76.3    -      -       +      +
    288B  THR*     1.3    53.2    +      -       -      +
    290B  GLN*     3.1    12.4    +      -       -      +
    291B  ALA*     2.7    36.7    +      -       -      +
    306B  LEU*     3.8    26.6    -      -       +      +
    309B  GLU*     3.6    37.0    +      -       -      +
    310B  SER*     3.7     6.3    -      -       -      +
    313B  SER*     3.3    35.0    +      -       -      -
----------------------------------------------------------
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Residues in contact with THR 288 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     41B  ILE*     4.1    21.9    -      -       +      +
     42B  GLY*     3.1    25.5    +      -       -      -
     51B  LEU*     3.6    36.2    +      -       +      -
     52B  VAL      4.0    11.9    -      -       -      +
     53B  LEU*     4.4     1.3    -      -       +      -
    200B  LEU*     4.3     8.1    -      -       +      -
    284B  GLU*     2.8    27.4    +      -       -      +
    285B  ILE      3.7     4.7    -      -       -      -
    286B  ARG      3.3     0.2    -      -       -      -
    287B  ARG*     1.3    72.9    -      -       -      +
    289B  ALA*     1.3    62.5    +      -       -      +
    291B  ALA*     3.1     2.3    +      -       -      +
    292B  ALA*     3.0    23.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 289 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     51B  LEU*     3.7    23.9    -      -       +      +
    200B  LEU*     5.6     1.8    -      -       -      -
    285B  ILE      3.2    10.3    +      -       -      +
    286B  ARG*     3.8     5.4    -      -       -      +
    288B  THR*     1.3    80.1    -      -       -      +
    290B  GLN*     1.3    62.8    +      -       +      +
    292B  ALA*     3.7     6.9    +      -       -      +
    293B  ALA*     3.4    19.1    +      -       -      +
    296B  ARG*     5.4     0.9    +      -       -      -
----------------------------------------------------------
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Residues in contact with GLN 290 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    286B  ARG*     3.0    41.8    +      -       -      +
    287B  ARG*     3.4    12.7    -      -       -      +
    289B  ALA*     1.3    75.5    -      -       +      +
    291B  ALA*     1.3    64.0    +      -       -      +
    293B  ALA*     3.3     8.4    +      -       -      +
    294B  ALA*     3.1    21.3    +      -       -      +
    297B  ARG*     5.2     1.4    +      -       -      -
    306B  LEU*     3.6    28.6    -      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 291 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     41B  ILE*     3.8    26.9    -      -       +      -
     53B  LEU*     4.7     0.2    -      -       +      -
    287B  ARG      2.7    19.5    +      -       -      +
    288B  THR      3.1     4.2    +      -       -      +
    290B  GLN*     1.3    71.4    -      -       -      +
    292B  ALA*     1.3    65.2    +      -       -      +
    294B  ALA*     3.3     2.1    +      -       -      +
    295B  LEU      3.0    10.6    +      -       -      -
    303B  PHE*     3.0    44.3    -      -       +      -
    306B  LEU*     3.5    14.1    -      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 292 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     53B  LEU*     4.3    16.4    -      -       +      +
    200B  LEU*     4.0    33.2    -      -       +      -
    211B  VAL*     4.9     3.8    -      -       +      +
    288B  THR      3.0    15.1    +      -       -      +
    289B  ALA*     3.9     6.1    -      -       -      +
    291B  ALA*     1.3    78.3    -      -       -      +
    293B  ALA*     1.3    61.3    -      -       -      +
    295B  LEU*     3.1     7.5    +      -       -      +
    296B  ARG*     3.1    38.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 293 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    289B  ALA      3.4    10.4    +      -       -      +
    290B  GLN*     3.3    11.1    +      -       -      +
    291B  ALA      3.2     0.6    -      -       -      -
    292B  ALA*     1.3    79.6    -      -       -      +
    294B  ALA*     1.3    61.1    +      -       -      +
    296B  ARG*     3.3    25.4    +      -       -      +
    297B  ARG*     3.4    30.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 294 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    290B  GLN      3.1    12.2    +      -       -      +
    291B  ALA*     3.3     8.9    +      -       -      +
    293B  ALA*     1.3    75.2    -      -       -      +
    295B  LEU*     1.3    55.0    +      -       -      +
    297B  ARG*     3.4    22.7    -      -       -      +
    298B  GLY      3.0     7.4    +      -       -      -
    299B  ASP*     2.7    52.7    +      -       +      +
    302B  ALA*     4.2     4.7    -      -       +      -
    303B  PHE*     4.0    16.4    -      -       +      +
    306B  LEU*     5.1     2.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 295 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     40B  LEU*     5.2     1.6    -      -       +      -
     53B  LEU*     4.6    17.0    -      -       +      -
    198B  ALA*     4.6     7.4    -      -       +      -
    211B  VAL*     3.4    29.4    -      -       +      -
    212B  PRO      4.5     6.9    -      -       -      +
    213B  LEU*     4.0    37.9    -      -       +      -
    218B  LEU*     5.1     1.3    -      -       +      -
    291B  ALA      3.0    12.6    +      -       -      +
    292B  ALA*     3.1     9.8    +      -       -      +
    294B  ALA*     1.3    76.0    -      -       -      +
    296B  ARG*     1.3    65.9    +      -       -      +
    298B  GLY*     3.0    14.2    +      -       -      +
    299B  ASP      4.9     0.2    -      -       -      +
    300B  TYR*     4.2    19.9    -      -       +      -
    303B  PHE*     4.2    18.6    -      -       +      -
    355B  LEU*     5.4     3.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with ARG 296 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    200B  LEU*     3.7    23.8    -      -       -      +
    209B  SER*     4.5    10.7    +      -       -      -
    211B  VAL*     4.3    28.9    -      -       +      +
    289B  ALA      5.4     1.2    +      -       -      -
    292B  ALA*     3.1    34.1    +      -       -      +
    293B  ALA*     3.3    15.5    +      -       -      +
    295B  LEU*     1.3    76.7    -      -       -      +
    297B  ARG*     1.3    57.6    +      -       +      +
    298B  GLY      3.7     0.2    +      -       -      -
----------------------------------------------------------
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Residues in contact with ARG 297 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    290B  GLN      5.2     1.4    +      -       -      -
    293B  ALA*     3.4    28.1    +      -       -      +
    294B  ALA*     3.4    28.2    -      -       -      +
    296B  ARG*     1.3    78.8    -      -       -      +
    298B  GLY*     1.3    58.8    +      -       -      +
    299B  ASP*     3.6    28.6    +      -       +      +
    302B  ALA*     4.8     4.0    -      -       -      +
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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