Contacts of the helix formed by residues 276 - 299 (chain B) in PDB entry 3P3W


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 LYS 276 (chain B).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     15B  ASN*     4.1    25.1    +      -       -      -
     17B  VAL*     5.6     1.8    -      -       -      +
     18B  GLN*     3.0    34.4    +      -       -      +
     19B  GLU*     4.2    17.7    +      -       -      +
    226B  ASP*     3.5    22.0    -      -       -      +
    269B  GLU*     5.0     7.5    +      -       -      +
    273B  ALA*     5.1     9.4    -      -       -      -
    274B  PRO      4.0     6.7    -      -       -      +
    275B  LEU*     1.3    76.8    -      -       -      +
    277B  TYR*     1.3    62.4    +      -       +      +
    278B  THR*     4.0     9.4    -      -       -      +
    279B  SER*     2.9    24.2    +      -       -      +
    280B  ALA      3.2     8.1    +      -       -      -
----------------------------------------------------------
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Residues in contact with TYR 277 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    114B  ARG*     3.1    44.7    +      -       -      -
    195B  VAL*     4.2    11.5    -      -       +      +
    221B  ASN*     4.1    13.4    +      -       -      -
    222B  LEU*     3.6    37.6    +      -       +      +
    223B  GLY*     3.4    33.0    -      -       -      -
    225B  THR*     5.7     0.8    +      -       -      -
    226B  ASP*     4.0     5.5    +      -       -      -
    244B  ILE*     4.3    14.3    -      -       +      +
    245B  VAL*     4.8     5.4    -      -       +      -
    275B  LEU*     3.9     9.2    +      -       -      -
    276B  LYS*     1.3    72.5    -      -       +      +
    278B  THR*     1.3    75.8    +      -       +      +
    280B  ALA*     3.3     6.9    +      -       -      +
    281B  LEU*     3.1    41.8    +      -       +      +
----------------------------------------------------------
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Residues in contact with THR 278 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     19B  GLU*     2.7    32.0    +      -       -      +
     76B  PHE*     4.7    10.8    -      -       +      -
     99B  PRO*     4.2    11.4    -      -       +      +
    114B  ARG*     3.7    16.6    -      -       -      +
    276B  LYS*     4.0     9.2    -      -       -      +
    277B  TYR*     1.3   105.4    -      -       +      +
    279B  SER*     1.3    54.1    +      -       -      +
    281B  LEU*     3.3    10.1    +      -       -      +
    282B  THR*     2.7    36.2    +      -       -      -
----------------------------------------------------------
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Residues in contact with SER 279 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     18B  GLN*     2.8    26.0    +      -       -      -
     19B  GLU*     3.4    27.4    +      -       -      +
     22B  ALA*     3.3    31.3    -      -       -      +
    275B  LEU*     3.8    10.8    -      -       -      -
    276B  LYS*     2.9    11.6    +      -       -      +
    278B  THR*     1.3    77.3    +      -       -      +
    280B  ALA*     1.3    61.4    +      -       -      +
    282B  THR*     3.3     7.6    -      -       -      -
    283B  HIS*     3.3    13.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 280 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    245B  VAL*     4.2    16.8    -      -       +      -
    255B  PHE*     6.3     0.9    -      -       -      -
    275B  LEU*     3.7    27.3    -      -       +      +
    276B  LYS      3.2     3.4    +      -       -      -
    277B  TYR      3.5     9.6    -      -       -      +
    279B  SER*     1.3    78.5    -      -       -      +
    281B  LEU*     1.3    58.2    +      -       +      +
    283B  HIS*     3.4     8.3    +      -       -      +
    284B  ASP*     2.9    35.4    +      -       -      +
    338B  MET*     4.2    18.8    -      -       +      +
    339B  THR*     5.1     2.2    -      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 281 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     99B  PRO*     3.8    31.2    -      -       +      +
    113B  MET*     3.6    33.5    -      -       +      +
    114B  ARG*     4.4     9.9    -      -       +      -
    115B  PRO*     4.5     0.9    -      -       +      -
    244B  ILE*     3.4    31.0    -      -       +      -
    277B  TYR*     3.1    37.7    +      -       +      +
    278B  THR*     3.6     8.1    -      -       -      +
    279B  SER      3.3     0.2    -      -       -      -
    280B  ALA*     1.3    74.3    -      -       -      +
    282B  THR*     1.3    55.4    +      -       -      +
    284B  ASP*     3.6     4.3    -      -       -      -
    285B  ALA*     2.8    35.5    +      -       -      +
    339B  THR*     3.7    16.6    -      -       +      +
    350B  ARG*     4.5     1.1    -      -       -      +
----------------------------------------------------------
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Residues in contact with THR 282 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     19B  GLU*     3.4    34.1    -      -       -      +
     22B  ALA*     4.2     0.2    -      -       -      -
     23B  PHE*     3.8    21.1    -      -       +      +
     74B  PHE*     3.6    36.0    -      -       +      -
     76B  PHE*     4.2     2.9    -      -       -      -
     99B  PRO*     4.2     0.6    -      -       -      +
    278B  THR      2.7    22.2    +      -       -      -
    279B  SER*     3.3    13.0    -      -       -      -
    280B  ALA      3.3     0.2    -      -       -      -
    281B  LEU*     1.3    77.0    -      -       -      +
    283B  HIS*     1.3    61.2    +      -       -      +
    285B  ALA*     3.3    15.2    +      -       -      +
    286B  ILE*     3.4    12.7    -      -       -      +
----------------------------------------------------------
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Residues in contact with HIS 283 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     22B  ALA*     4.4     6.2    +      -       +      +
     26B  ALA*     4.1    26.9    -      -       +      -
     29B  LEU*     5.0    13.0    -      -       +      +
    251B  MET*     6.3     1.8    -      -       +      -
    255B  PHE*     4.1    28.7    -      +       +      -
    279B  SER      3.3     8.7    +      -       -      +
    280B  ALA*     3.6     7.2    -      -       -      +
    282B  THR*     1.3    79.9    -      -       -      +
    284B  ASP*     1.3    68.5    +      -       -      +
    286B  ILE*     3.1    17.2    +      -       +      +
    287B  LEU*     3.3    44.1    +      -       +      +
    338B  MET*     3.3    35.6    -      -       +      -
----------------------------------------------------------
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Residues in contact with ASP 284 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    113B  MET*     3.6    16.8    -      -       +      +
    280B  ALA*     2.9    17.3    +      -       -      +
    281B  LEU*     3.8     1.3    -      -       -      +
    283B  HIS*     1.3    80.9    +      -       -      +
    285B  ALA*     1.3    64.4    +      -       -      +
    287B  LEU*     3.3    24.3    +      -       -      +
    288B  VAL*     3.3    24.8    +      -       -      +
    337B  GLY*     3.6     2.4    -      -       -      -
    338B  MET*     3.1    26.1    +      -       -      +
    339B  THR*     2.7    38.4    +      -       -      +
    342B  ILE*     4.0     8.9    -      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 285 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     74B  PHE*     3.5    27.1    -      -       +      -
     97B  VAL*     3.8    15.6    -      -       +      +
    113B  MET*     3.8    15.7    -      -       +      -
    281B  LEU      2.8    17.5    +      -       -      +
    282B  THR      3.4     7.6    -      -       -      +
    283B  HIS      3.2     0.2    -      -       -      -
    284B  ASP*     1.3    75.8    -      -       -      +
    286B  ILE*     1.3    64.0    +      -       +      +
    288B  VAL*     3.4     4.9    +      -       -      +
    289B  ILE*     3.2    28.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 286 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      8B  ILE*     5.0     3.6    -      -       +      -
     23B  PHE*     3.7    36.1    -      -       +      +
     26B  ALA*     3.4    42.8    -      -       +      +
     27B  VAL*     4.9     7.4    -      -       +      -
     30B  TYR*     5.6     4.0    -      -       +      -
     43B  LEU*     5.0    16.1    -      -       +      +
     74B  PHE*     5.4     2.2    -      -       +      -
    282B  THR      3.4    19.6    +      -       -      +
    283B  HIS*     3.1    10.4    +      -       +      +
    285B  ALA*     1.3    78.1    -      -       +      +
    287B  LEU*     1.3    60.1    +      -       +      +
    289B  ILE*     3.2    15.3    +      -       +      +
    290B  ALA*     2.8    38.9    +      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 287 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     29B  LEU*     5.9     6.7    -      -       +      -
    251B  MET*     5.7     4.0    -      -       -      -
    283B  HIS*     3.3    32.8    +      -       +      +
    284B  ASP*     3.3    32.8    -      -       +      +
    285B  ALA      3.3     0.2    -      -       -      -
    286B  ILE*     1.3    83.4    -      -       +      +
    288B  VAL*     1.3    58.7    +      -       -      +
    290B  ALA*     4.1     6.6    -      -       +      +
    291B  GLU*     3.2    24.3    +      -       -      +
    294B  ARG*     4.9     1.2    +      -       -      -
    335B  VAL*     4.3    23.7    -      -       +      +
    336B  GLN      5.4     0.7    -      -       -      +
    337B  GLY*     4.1    16.4    -      -       -      -
    342B  ILE*     5.0     0.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with VAL 288 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     97B  VAL*     5.9     2.5    -      -       +      -
    111B  ILE*     5.2     4.9    -      -       +      -
    113B  MET*     4.2     5.4    -      -       -      -
    284B  ASP      3.3    14.7    +      -       -      +
    285B  ALA*     3.6     7.4    -      -       -      +
    286B  ILE      3.2     0.4    -      -       -      -
    287B  LEU*     1.3    74.9    -      -       -      +
    289B  ILE*     1.3    61.3    +      -       +      +
    291B  GLU*     3.3     3.0    +      -       -      +
    292B  ALA*     2.9    29.3    +      -       -      +
    330B  LEU*     3.7    33.9    -      -       +      +
    333B  VAL*     3.7    14.4    -      -       +      +
    335B  VAL*     5.8     3.6    -      -       +      -
    342B  ILE*     3.8    30.7    -      -       +      -
    344B  PHE*     3.8    18.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with ILE 289 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      6B  ILE*     5.9     0.4    -      -       +      -
      8B  ILE*     4.3    35.2    -      -       +      -
     41B  PHE*     5.8     0.2    -      -       -      -
     43B  LEU*     5.3     9.2    -      -       +      -
     72B  ALA*     4.7     9.4    -      -       +      -
     74B  PHE*     4.9     9.0    -      -       +      +
     97B  VAL*     4.0    30.3    -      -       +      -
    285B  ALA*     3.3    20.6    -      -       +      +
    286B  ILE*     3.2    12.5    +      -       +      +
    288B  VAL*     1.3    76.6    -      -       +      +
    290B  ALA*     1.3    62.3    +      -       -      +
    292B  ALA*     3.5     0.3    +      -       -      +
    293B  PHE*     3.2    52.2    +      -       +      +
    330B  LEU*     4.2    13.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 290 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     30B  TYR*     4.7    20.2    -      -       +      -
     41B  PHE*     4.2     9.1    -      -       -      -
     43B  LEU*     5.9     4.9    -      -       +      +
    286B  ILE*     2.8    26.7    +      -       +      +
    287B  LEU*     4.1     8.3    -      -       +      +
    289B  ILE*     1.3    74.9    -      -       -      +
    291B  GLU*     1.3    61.0    +      -       -      +
    293B  PHE*     3.5     1.7    +      -       -      +
    294B  ARG*     3.2    45.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 291 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    287B  LEU      3.2    17.6    +      -       -      +
    288B  VAL      3.8     3.1    -      -       -      +
    290B  ALA*     1.3    76.4    -      -       -      +
    292B  ALA*     1.3    63.9    +      -       -      +
    293B  PHE      3.4     0.2    -      -       -      -
    294B  ARG*     2.4    33.8    +      -       -      +
    295B  TYR*     3.3    21.7    +      -       -      +
    298B  ARG*     3.6    24.8    +      -       -      -
    333B  VAL*     3.8    21.2    -      -       +      +
    334B  GLN      5.4     1.3    -      -       -      +
    335B  VAL*     3.8    26.6    -      -       +      +
----------------------------------------------------------
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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
----------------------------------------------------------
    288B  VAL      2.9    16.7    +      -       -      +
    289B  ILE      3.8     2.7    -      -       -      +
    290B  ALA      3.3     0.2    -      -       -      -
    291B  GLU*     1.3    77.8    -      -       -      +
    293B  PHE*     1.3    59.7    +      -       +      +
    295B  TYR*     3.4     5.9    +      -       -      +
    296B  LEU*     3.0    32.6    +      -       +      +
    329B  ALA*     3.7    25.9    -      -       +      +
    330B  LEU*     3.7    29.2    -      -       +      -
    333B  VAL*     4.0     4.0    -      -       +      +
----------------------------------------------------------
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Residues in contact with PHE 293 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      6B  ILE*     3.7    43.1    -      -       +      -
     41B  PHE*     3.4    29.5    -      +       +      -
     71B  TYR*     3.8    31.6    -      +       +      -
     72B  ALA*     4.7     7.6    -      -       +      -
    289B  ILE*     3.2    42.7    +      -       +      +
    292B  ALA*     1.3    79.6    -      -       +      +
    294B  ARG*     1.3    60.3    +      -       -      +
    295B  TYR      3.2     1.3    -      -       -      -
    296B  LEU*     3.3    31.5    +      -       +      +
    297B  ARG*     3.2    23.9    +      -       -      +
    303B  VAL*     4.6     7.0    -      -       +      -
    326B  ILE*     4.5     9.9    -      -       +      -
    330B  LEU*     5.2    11.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with ARG 294 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     30B  TYR*     4.1     8.5    -      -       -      +
     37B  THR      4.4     7.0    -      -       -      -
     38B  GLU*     3.1    34.9    +      -       -      +
     40B  PRO*     4.0    15.7    -      -       +      +
     41B  PHE*     4.0    15.5    -      -       +      -
    287B  LEU      4.9     1.0    +      -       -      -
    290B  ALA*     3.2    42.6    +      -       -      +
    291B  GLU*     2.4    46.7    +      -       -      +
    292B  ALA      3.4     0.2    -      -       -      -
    293B  PHE*     1.3    72.6    -      -       -      +
    295B  TYR*     1.3    59.4    +      -       -      +
    296B  LEU      3.2     0.2    -      -       -      -
    297B  ARG*     3.5     3.4    +      -       -      +
    298B  ARG*     3.0    43.1    +      -       -      +
    335B  VAL*     5.3     0.8    -      -       -      +
----------------------------------------------------------
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Residues in contact with TYR 295 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    291B  GLU*     3.3    13.7    +      -       -      +
    292B  ALA*     3.4    11.4    -      -       -      +
    293B  PHE      3.2     0.4    -      -       -      -
    294B  ARG*     1.3    78.3    -      -       -      +
    296B  LEU*     1.3    59.3    +      -       +      +
    298B  ARG*     3.2    30.6    +      -       -      +
    299B  GLN*     3.0    61.0    +      -       +      +
    329B  ALA*     3.9    17.7    -      -       +      +
    332B  MET*     3.2    48.6    -      -       +      +
    333B  VAL*     5.7     2.0    -      -       +      -
    322C  GLN*     3.7    18.1    +      -       -      +
    324C  ILE*     5.1     0.3    -      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 296 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    292B  ALA*     3.0    19.2    +      -       +      +
    293B  PHE*     3.3    44.6    -      -       +      +
    294B  ARG      3.2     0.4    -      -       -      -
    295B  TYR*     1.3    80.7    -      -       +      +
    297B  ARG*     1.3    57.4    +      -       -      +
    299B  GLN*     3.5     6.4    +      -       +      +
    300B  ARG      3.0    18.0    +      -       -      -
    301B  VAL*     3.2    25.0    +      -       +      +
    303B  VAL*     3.8    25.6    -      -       +      -
    325B  ASP      4.9     7.0    -      -       -      +
    326B  ILE*     3.8    16.2    -      -       +      -
    329B  ALA*     3.4    27.8    -      -       +      -
----------------------------------------------------------
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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
----------------------------------------------------------
      2B  PHE*     4.3    25.8    -      -       +      +
     40B  PRO*     3.5    42.4    +      -       +      +
     41B  PHE*     5.4     4.7    -      -       +      -
    293B  PHE      3.2    14.0    +      -       -      +
    294B  ARG*     3.5     6.5    +      -       -      +
    296B  LEU*     1.3    73.3    -      -       -      +
    298B  ARG*     1.3    63.4    +      -       -      +
    299B  GLN      3.3     0.9    -      -       -      -
    300B  ARG*     3.3    43.3    +      -       -      +
    301B  VAL      5.1     0.2    -      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 298 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    291B  GLU*     3.6    22.6    +      -       -      -
    294B  ARG*     3.0    36.1    +      -       -      +
    295B  TYR*     3.3    31.9    -      -       -      +
    297B  ARG*     1.3    78.8    -      -       -      +
    299B  GLN*     1.3    70.1    +      -       -      +
    300B  ARG*     4.2     9.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLN 299 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    295B  TYR*     3.0    59.1    +      -       +      +
    296B  LEU*     3.9     4.3    -      -       +      +
    298B  ARG*     1.3    87.9    +      -       -      +
    300B  ARG*     1.3    71.5    +      -       -      +
    301B  VAL*     3.6    21.4    +      -       +      +
    322C  GLN*     5.4     7.6    +      -       -      +
----------------------------------------------------------
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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