Contacts of the helix formed by residues 16 - 41 (chain B) in PDB entry 4ZPK


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 16 (chain B).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     12B  SER*     3.7    10.6    +      -       -      +
     14B  LEU      3.5     0.2    -      -       -      -
     15B  ARG*     1.3   107.4    -      -       +      +
     17B  GLU*     1.3    62.5    +      -       -      +
     18B  LYS      3.3     1.8    -      -       -      -
     19B  SER*     3.3    12.2    -      -       -      +
     20B  ARG*     2.6    38.1    +      -       -      +
     14D    T      3.5    43.8    +      -       +      +
     15D    A      3.3    32.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 17 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      9B  ARG*     5.7     2.3    +      -       -      -
     12B  SER      3.8     6.2    -      -       -      +
     13B  GLU*     3.2    43.0    +      -       +      +
     16B  LYS*     1.3    76.3    +      -       -      +
     18B  LYS*     1.3    68.4    +      -       +      +
     20B  ARG*     3.1    33.5    +      -       -      +
     21B  ASP*     3.0    32.9    +      -       -      +
     14D    T      6.1     0.2    -      -       -      -
----------------------------------------------------------
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Residues in contact with LYS 18 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     14B  LEU*     3.7    36.3    +      -       -      +
     15B  ARG      4.7     2.5    -      -       -      +
     17B  GLU*     1.3    78.1    -      -       +      +
     19B  SER*     1.3    57.4    +      -       -      +
     21B  ASP*     2.8    21.5    -      -       -      +
     22B  ALA*     2.9    25.1    +      -       +      +
      4C    T      3.9    24.1    +      -       -      -
      5C    G      3.3    33.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with SER 19 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     15B  ARG      3.8     9.2    +      -       -      -
     16B  LYS*     3.1    22.8    +      -       -      +
     18B  LYS*     1.3    80.2    -      -       -      +
     20B  ARG*     1.3    63.3    +      -       -      +
     22B  ALA*     4.9     1.1    -      -       -      -
     23B  ALA*     2.9    30.7    +      -       -      +
     13D    G      6.3     0.2    -      -       -      -
     14D    T      3.8    23.1    -      -       -      +
     15D    A      5.6     5.0    +      -       -      -
----------------------------------------------------------
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Residues in contact with ARG 20 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     16B  LYS      2.6    20.0    +      -       -      +
     17B  GLU*     3.1    40.5    +      -       -      +
     19B  SER*     1.3    72.5    -      -       -      +
     21B  ASP*     1.3    63.7    +      -       -      +
     23B  ALA*     3.9     1.2    -      -       -      +
     24B  ARG*     2.9    56.7    +      -       -      +
     13D    G      3.5    47.7    +      -       +      +
     14D    T      3.3    26.4    -      -       -      +
----------------------------------------------------------
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Residues in contact with ASP 21 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     17B  GLU*     3.0    18.2    +      -       -      +
     18B  LYS*     2.8    17.7    -      -       -      +
     20B  ARG*     1.3    81.0    +      -       -      +
     22B  ALA*     1.3    76.2    +      -       -      +
     24B  ARG*     3.4    29.6    +      -       -      +
     25B  CYS*     2.9    25.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 22 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     18B  LYS*     2.9    18.9    +      -       +      +
     19B  SER*     4.5     1.3    -      -       -      +
     21B  ASP*     1.3    79.9    +      -       -      +
     23B  ALA*     1.3    61.3    +      -       -      +
     24B  ARG      3.1     1.1    -      -       -      -
     25B  CYS*     3.0    10.0    +      -       -      +
     26B  ARG*     2.9    27.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 23 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     19B  SER*     2.9    20.9    +      -       -      +
     20B  ARG      4.0     1.6    -      -       -      +
     22B  ALA*     1.3    77.1    -      -       -      +
     24B  ARG*     1.3    57.0    +      -       -      +
     26B  ARG*     3.4    11.7    +      -       -      +
     27B  ARG*     2.9    61.5    +      -       -      +
      8C    T      6.0     2.2    -      -       +      +
     13D    G      5.3     0.4    -      -       +      -
     14D    T      3.6    14.1    -      -       +      +
----------------------------------------------------------
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Residues in contact with ARG 24 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     20B  ARG*     2.9    48.4    +      -       -      +
     21B  ASP*     3.4    43.6    +      -       -      +
     22B  ALA      3.1     0.2    -      -       -      -
     23B  ALA*     1.3    78.4    -      -       -      +
     25B  CYS*     1.3    55.8    +      -       -      +
     27B  ARG*     3.2     5.1    +      -       -      +
     28B  SER*     2.9    32.6    +      -       -      +
     12D    C      3.2    39.3    +      -       +      +
     13D    G      3.6    16.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with CYS 25 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     21B  ASP      2.9    15.8    +      -       -      +
     22B  ALA*     3.0    12.8    +      -       -      +
     24B  ARG*     1.3    76.7    -      -       -      +
     26B  ARG*     1.3    57.6    +      -       -      +
     28B  SER*     3.2    10.9    +      -       -      -
     29B  LYS*     3.0    38.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 26 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    127A  ASP*     3.9    11.5    +      -       -      -
    129A  LEU*     3.4    34.6    -      -       +      +
     22B  ALA      2.9    11.8    +      -       -      +
     23B  ALA*     3.6    13.8    -      -       -      +
     24B  ARG      3.3     0.2    -      -       -      -
     25B  CYS*     1.3    74.1    -      -       -      +
     27B  ARG*     1.3    63.0    +      -       +      +
     29B  LYS*     3.1    10.6    +      -       -      +
     30B  GLU*     2.8    30.5    +      -       +      +
      6C    C      4.4     3.8    -      -       -      +
      7C    G      2.9    48.3    +      -       -      +
      8C    T      3.9    40.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 27 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     23B  ALA*     2.9    48.6    +      -       -      +
     24B  ARG*     3.5     6.1    -      -       -      +
     26B  ARG*     1.3    77.2    -      -       +      +
     28B  SER*     1.3    62.7    +      -       -      +
     30B  GLU*     2.9    28.9    -      -       -      +
     31B  THR*     3.0    18.8    +      -       +      +
      9C    A      4.7     4.2    -      -       -      +
     11D    A      3.9    19.7    -      -       +      +
     12D    C      3.1    51.0    +      -       -      +
     13D    G      2.6    43.2    +      -       -      -
     14D    T      3.6     6.3    +      -       -      -
----------------------------------------------------------
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Residues in contact with SER 28 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     24B  ARG*     2.9    16.4    +      -       -      +
     25B  CYS*     3.2    14.0    -      -       -      -
     26B  ARG      3.2     0.2    -      -       -      -
     27B  ARG*     1.3    73.6    -      -       -      +
     29B  LYS*     1.3    68.0    +      -       -      +
     31B  THR*     2.7    23.2    +      -       -      -
     32B  GLU*     3.0    11.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 29 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    129A  LEU*     4.0    19.1    -      -       +      -
    133A  ARG*     6.2     1.8    -      -       -      +
     25B  CYS*     3.0    26.3    +      -       -      +
     26B  ARG*     3.1    11.2    +      -       -      +
     28B  SER*     1.3    76.5    -      -       -      +
     30B  GLU*     1.3    64.5    +      -       -      +
     32B  GLU*     3.7     3.9    -      -       -      +
     33B  VAL*     2.9    32.6    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLU 30 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    128A  LYS*     5.6     6.5    -      -       -      -
    129A  LEU*     3.5    20.4    -      -       +      +
    132A  LEU*     6.1     0.4    -      -       -      -
     26B  ARG*     2.8    21.2    +      -       +      +
     27B  ARG*     2.9    26.8    -      -       -      +
     29B  LYS*     1.3    71.9    -      -       -      +
     31B  THR*     1.3    85.2    +      -       -      +
     33B  VAL*     3.1     3.5    +      -       -      +
     34B  PHE*     2.9    51.8    +      -       +      -
     53B  LYS*     4.9     5.9    -      -       -      +
     11D    A      4.2    12.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with THR 31 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     27B  ARG*     3.0    15.9    +      -       +      +
     28B  SER*     2.7    24.1    +      -       -      -
     30B  GLU*     1.3    96.0    -      -       -      +
     32B  GLU*     1.3    60.2    +      -       -      +
     34B  PHE*     2.9    21.8    +      -       -      +
     35B  TYR*     3.0    19.3    +      -       -      +
     11D    A      3.5    28.0    -      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 32 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    133A  ARG*     5.9     0.7    +      -       -      -
     28B  SER      3.0    13.6    +      -       -      +
     29B  LYS*     3.9     3.7    -      -       -      +
     31B  THR*     1.3    82.3    +      -       -      +
     33B  VAL*     1.3    61.7    +      -       -      +
     35B  TYR*     4.3     3.6    -      -       -      +
     36B  GLU*     3.2    40.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 33 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    129A  LEU*     4.5     5.2    -      -       +      -
    132A  LEU*     2.8    39.3    -      -       +      +
    133A  ARG*     3.4    48.7    -      -       -      +
    136A  VAL*     3.8     7.3    -      -       +      +
     29B  LYS*     2.9    34.0    +      -       +      +
     30B  GLU*     3.4     6.1    -      -       -      +
     32B  GLU*     1.3    82.9    -      -       -      +
     34B  PHE*     1.3    62.5    +      -       -      +
     36B  GLU*     3.3    19.0    -      -       -      +
     37B  LEU*     3.7     4.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with PHE 34 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    109A  ILE*     5.1     3.1    -      -       +      -
    128A  LYS*     4.6    16.4    -      -       -      -
    132A  LEU*     3.0    38.8    -      -       +      -
     30B  GLU*     2.9    52.2    +      -       +      -
     31B  THR*     2.9     8.9    +      -       -      +
     33B  VAL*     1.3    74.1    -      -       -      +
     35B  TYR*     1.3    64.7    +      -       +      +
     36B  GLU      3.0     4.3    -      -       -      -
     37B  LEU*     2.8    35.0    +      -       +      +
     38B  ALA*     3.0    10.4    +      -       -      +
     53B  LYS*     3.4    43.7    -      -       +      -
     56B  ILE*     4.3    11.1    -      -       +      +
     57B  MET*     4.1    15.3    -      -       -      -
----------------------------------------------------------
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Residues in contact with TYR 35 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     31B  THR*     3.0    18.4    +      -       -      +
     32B  GLU*     5.1     3.4    -      -       -      +
     34B  PHE*     1.3    78.7    -      -       +      +
     36B  GLU*     1.3    57.4    +      -       -      +
     37B  LEU      3.5     0.2    -      -       -      -
     38B  ALA*     3.8     6.4    -      -       +      +
     39B  HIS*     2.9    24.8    +      -       -      +
     48B  SER      5.0     0.7    -      -       -      +
     49B  SER*     3.0    33.2    -      -       -      +
     50B  HIS*     4.3     4.8    -      -       -      -
     51B  LEU      2.7    32.1    +      -       -      -
     52B  ASP*     4.9     3.1    -      -       -      -
     53B  LYS*     5.2     5.3    +      -       +      -
     56B  ILE*     4.0    14.8    -      -       +      -
     10D    C      5.4     2.5    +      -       -      -
----------------------------------------------------------
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Residues in contact with GLU 36 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    133A  ARG*     3.4    26.2    +      -       -      -
    136A  VAL*     4.6    14.9    -      -       +      +
     32B  GLU*     3.2    30.2    +      -       -      +
     33B  VAL*     3.3    28.0    -      -       -      +
     35B  TYR*     1.3    76.4    -      -       -      +
     37B  LEU*     1.3    60.9    +      -       -      +
     38B  ALA      3.3     0.2    -      -       -      -
     39B  HIS*     3.5    12.7    +      -       +      +
     40B  GLU*     2.9    28.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 37 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    112A  LEU*     5.1     7.0    -      -       +      -
    132A  LEU*     5.5     3.8    -      -       +      -
    135A  ALA*     4.7     4.7    -      -       +      -
    136A  VAL*     3.6    33.4    -      -       +      +
    139A  MET*     3.8    38.1    -      -       +      -
     33B  VAL      4.0     2.9    -      -       -      +
     34B  PHE*     2.8    21.2    +      -       +      +
     36B  GLU*     1.3    82.8    -      -       -      +
     38B  ALA*     1.3    63.3    +      -       -      +
     40B  GLU*     3.1    28.9    +      -       -      +
     41B  LEU*     3.2     4.0    +      -       +      +
     56B  ILE*     3.7    22.0    -      -       +      +
     57B  MET*     4.8    10.1    -      -       -      -
     60B  ALA*     4.2    15.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 38 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     34B  PHE      3.0     6.2    +      -       -      +
     35B  TYR*     3.8     9.9    -      -       -      +
     37B  LEU*     1.3    77.3    -      -       -      +
     39B  HIS*     1.3    62.1    -      -       -      +
     41B  LEU*     3.1    32.8    -      -       +      +
     48B  SER*     3.2    30.7    -      -       -      +
     49B  SER      4.9     1.1    -      -       -      +
     51B  LEU*     4.4     0.7    -      -       +      -
     56B  ILE*     3.5    37.0    -      -       +      +
----------------------------------------------------------
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Residues in contact with HIS 39 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    140A  LYS*     4.0    18.0    +      -       -      -
     35B  TYR      2.9    20.1    +      -       -      +
     36B  GLU*     3.5    13.8    +      -       +      +
     38B  ALA*     1.3    74.7    -      -       -      +
     40B  GLU*     1.3    67.5    +      -       -      +
     41B  LEU      3.3     2.8    +      -       -      +
     45B  HIS*     3.2    59.5    +      +       +      -
     48B  SER*     3.5    14.1    +      -       -      -
     49B  SER*     4.9     5.6    -      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 40 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    136A  VAL*     5.1     4.7    -      -       +      +
    139A  MET*     3.3    52.9    -      -       +      +
    140A  LYS*     3.5    45.8    +      -       +      +
     36B  GLU      2.9    14.5    +      -       -      +
     37B  LEU*     3.1    16.3    +      -       -      +
     39B  HIS*     1.3    84.5    +      -       -      +
     41B  LEU*     1.3    81.9    +      -       -      +
     42B  PRO*     4.5     4.3    -      -       -      +
     45B  HIS*     5.6     0.5    +      -       -      -
     63B  PHE*     4.9     3.5    -      -       -      -
----------------------------------------------------------
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Residues in contact with LEU 41 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    139A  MET*     3.5    26.0    -      -       +      -
    158A  PHE*     4.9     2.2    -      -       +      -
     37B  LEU*     3.2     9.1    +      -       +      +
     38B  ALA*     3.1    30.9    +      -       -      +
     39B  HIS      3.8     2.6    -      -       -      +
     40B  GLU*     1.3    92.1    +      -       -      +
     42B  PRO*     1.3    70.7    -      -       +      +
     43B  LEU*     2.8    34.5    -      -       +      +
     45B  HIS*     5.7     0.3    +      -       -      -
     48B  SER*     4.5     3.6    -      -       -      -
     51B  LEU*     4.1    10.8    -      -       +      -
     56B  ILE*     4.6     9.2    -      -       +      +
     59B  LEU*     4.1    43.7    -      -       +      +
     60B  ALA*     4.2     4.3    -      -       +      +
     63B  PHE*     5.1     0.7    -      -       +      -
----------------------------------------------------------
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A short description of the analytical approach
The contact analysis used in this page is based upon the approach developed in: Sobolev V., Wade R.C., Vriend G. and Edelman M. PROTEINS (1996) 25, 120-129. Contact legitimacy depends on the hydrophobic-hydrophilic properties of the contacting atoms. In order to define it, for each inter-atomic contact, eight atom classes have been introduced:


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

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

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