Contacts of the helix formed by residues 7 - 32 (chain B) in PDB entry 4NEF


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 ILE 7 (chain B).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      6B  SER*     1.4    78.2    +      -       -      +
      8B  ALA*     1.4    71.2    +      -       +      +
     10B  SER*     3.1    12.4    +      -       -      +
     11B  ARG*     3.1    56.6    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ALA 8 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      6B  SER      5.2     4.5    -      -       -      +
      7B  ILE*     1.4    84.3    -      -       +      +
      9B  PHE*     1.3    56.4    +      -       -      +
     11B  ARG*     3.4    15.9    +      -       -      +
     12B  ALA*     3.1    27.0    +      -       -      +
     62B  ILE      5.0     1.7    -      -       -      +
     85B  ARG*     5.8     0.7    -      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with PHE 9 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      6B  SER*     3.8    20.0    +      -       -      +
      7B  ILE      3.2     0.8    -      -       -      -
      8B  ALA*     1.3    76.9    -      -       -      +
     10B  SER*     1.4    61.7    +      -       -      +
     12B  ALA*     3.3     6.3    +      -       -      +
     13B  VAL*     3.0    41.1    +      -       +      +
     84B  LEU*     3.8    23.3    -      -       +      -
     85B  ARG*     3.8    55.9    -      -       +      +
     88B  PHE*     3.5    45.3    -      +       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with SER 10 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      6B  SER      2.9    15.6    +      -       -      -
      7B  ILE*     3.1    16.0    +      -       -      +
      9B  PHE*     1.4    79.6    -      -       -      +
     11B  ARG*     1.4    58.1    +      -       -      +
     13B  VAL*     3.4     6.4    +      -       -      +
     14B  PHE*     2.9    32.0    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ARG 11 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      7B  ILE*     3.1    48.4    +      -       +      +
      8B  ALA*     3.6    13.5    -      -       -      +
      9B  PHE      3.3     0.2    -      -       -      -
     10B  SER*     1.4    75.3    -      -       -      +
     12B  ALA*     1.3    56.3    -      -       -      +
     14B  PHE*     3.6     6.8    +      -       -      +
     15B  ALA*     3.0    29.6    +      -       -      +
     62B  ILE*     3.7     8.3    -      -       +      +
    221D  TYR      5.2     2.0    +      -       -      -
    222D  VAL*     3.2    28.0    +      -       +      +
    223D  LEU*     3.3    25.0    -      -       -      +
    224D  PHE*     6.3     0.4    -      -       -      -
    225D  PRO*     3.6    28.2    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ALA 12 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      8B  ALA      3.1    14.4    +      -       -      +
      9B  PHE      3.3     9.2    +      -       -      +
     11B  ARG*     1.3    72.7    -      -       -      +
     13B  VAL*     1.3    59.6    +      -       -      +
     15B  ALA*     3.4     0.7    +      -       -      -
     16B  GLU*     3.0    25.8    +      -       -      +
     62B  ILE*     3.7    16.5    -      -       -      +
     63B  SER*     3.3    18.3    -      -       -      -
     85B  ARG*     3.6    13.0    -      -       -      +
     89B  TYR*     3.2    25.6    -      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with VAL 13 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      9B  PHE*     3.0    52.3    +      -       +      +
     10B  SER*     3.9     6.1    -      -       -      +
     12B  ALA*     1.3    71.2    -      -       -      +
     14B  PHE*     1.4    59.2    +      -       -      +
     16B  GLU*     3.3     3.4    +      -       -      +
     17B  PHE*     3.0    24.3    +      -       +      +
     88B  PHE*     3.6    38.8    -      -       +      +
     89B  TYR*     4.1    12.1    -      -       +      -
     92B  ALA*     3.5    13.0    -      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with PHE 14 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     10B  SER      2.9    19.1    +      -       -      +
     11B  ARG*     3.9     5.2    -      -       -      +
     13B  VAL*     1.4    76.4    -      -       -      +
     15B  ALA*     1.4    54.7    +      -       -      +
     17B  PHE*     3.2    27.1    +      +       +      +
     18B  LEU*     2.9    41.0    +      -       +      +
    218D  LEU*     4.2    29.6    -      -       +      -
    222D  VAL*     3.8    27.4    -      -       +      -
    223D  LEU*     3.7    24.2    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with ALA 15 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     11B  ARG      3.0    19.2    +      -       -      +
     12B  ALA      3.5     5.2    -      -       -      +
     13B  VAL      3.3     0.2    -      -       -      -
     14B  PHE*     1.4    74.7    -      -       -      +
     16B  GLU*     1.4    53.6    +      -       -      +
     18B  LEU*     3.4     3.6    +      -       -      -
     19B  ALA*     2.8    37.6    +      -       -      +
     59B  LEU*     3.8    15.2    -      -       +      +
     62B  ILE*     3.8    20.9    -      -       +      -
     63B  SER*     4.0    11.9    -      -       -      +
    223D  LEU*     3.9    16.2    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with GLU 16 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     12B  ALA      3.0    16.5    +      -       -      +
     13B  VAL*     3.3    10.3    +      -       -      +
     15B  ALA*     1.4    74.5    -      -       -      +
     17B  PHE*     1.3    57.6    +      -       -      +
     19B  ALA*     4.0     3.3    -      -       -      +
     20B  THR*     2.6    33.4    +      -       -      -
     63B  SER*     2.6    23.0    +      -       -      +
     65B  ALA*     3.3     3.4    +      -       -      -
     66B  HIS*     2.9    26.7    +      -       -      -
     67B  ILE*     3.0    18.0    +      -       -      -
     89B  TYR*     3.7    26.9    -      -       +      +
     92B  ALA*     4.2    11.7    -      -       +      -
     93B  GLN*     2.9    31.5    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with PHE 17 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     13B  VAL*     3.0    13.4    +      -       +      +
     14B  PHE*     3.4    31.4    -      +       -      +
     16B  GLU*     1.3    73.1    -      -       -      +
     18B  LEU*     1.4    65.3    +      -       +      +
     20B  THR      3.4     2.4    +      -       -      -
     21B  LEU*     3.0    50.7    +      -       +      +
     92B  ALA*     3.4    20.4    -      -       +      +
     95B  LEU*     3.9    17.3    -      -       +      -
     96B  GLY*     3.4    40.0    -      -       -      -
     99B  ALA*     4.4     6.3    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with LEU 18 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     14B  PHE*     2.9    29.9    +      -       +      +
     15B  ALA      3.9     2.2    -      -       -      +
     17B  PHE*     1.4    80.8    -      -       +      +
     19B  ALA*     1.4    58.5    +      -       -      +
     21B  LEU*     3.4    12.7    +      -       +      +
     22B  LEU*     3.0    51.1    +      -       +      +
     59B  LEU*     4.7     6.5    -      -       +      -
    136D  PHE*     6.0     2.5    -      -       +      -
    139D  LEU*     4.6     7.2    -      -       +      -
    143D  LEU*     4.0    19.5    -      -       +      -
    218D  LEU*     3.8    32.5    -      -       +      -
    223D  LEU*     4.0    17.3    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with ALA 19 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     15B  ALA      2.8    24.3    +      -       -      +
     16B  GLU*     4.0     6.3    -      -       -      +
     18B  LEU*     1.4    72.5    -      -       -      +
     20B  THR*     1.4    56.7    +      -       -      +
     22B  LEU      3.4     1.0    +      -       -      -
     23B  PHE*     2.9    30.3    +      -       -      +
     55B  LEU*     3.4    13.6    -      -       +      +
     59B  LEU*     3.6    22.2    -      -       +      +
     65B  ALA*     5.7     0.9    -      -       -      -
     67B  ILE*     3.6    30.3    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with THR 20 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     16B  GLU      2.6    24.4    +      -       -      -
     17B  PHE      4.1     1.6    -      -       -      -
     19B  ALA*     1.4    72.5    -      -       -      +
     21B  LEU*     1.4    59.6    +      -       -      +
     23B  PHE*     4.3     1.8    -      -       +      -
     24B  VAL*     3.0    38.5    +      -       +      +
     67B  ILE*     3.6    30.0    -      -       +      +
     93B  GLN*     3.4    42.0    -      -       +      +
     96B  GLY      4.0     2.7    -      -       -      -
     97B  ALA*     3.9    12.9    -      -       +      -
    184B  ASN*     5.1     0.4    -      -       -      +
    186B  ALA*     4.1    10.3    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with LEU 21 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     17B  PHE*     3.0    44.5    +      -       +      +
     18B  LEU*     3.4    17.7    -      -       +      +
     20B  THR*     1.4    75.9    -      -       -      +
     22B  LEU*     1.3    63.8    +      -       +      +
     25B  PHE*     3.0    34.6    +      -       +      +
     96B  GLY      3.1    17.6    +      -       -      +
     99B  ALA*     3.8    14.4    -      -       +      -
    100B  GLY*     3.5    13.8    -      -       -      +
    103B  LEU*     4.1    17.5    -      -       +      -
    136D  PHE*     4.1    26.5    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with LEU 22 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     18B  LEU*     3.0    35.8    +      -       +      +
     19B  ALA      3.9     2.9    -      -       -      +
     21B  LEU*     1.3    75.7    -      -       +      +
     23B  PHE*     1.3    59.3    +      -       -      +
     25B  PHE*     3.8     4.2    -      -       +      +
     26B  PHE*     3.0    55.1    +      -       +      +
     55B  LEU*     3.8    26.2    -      -       +      -
     59B  LEU*     5.5     0.2    -      -       +      -
    136D  PHE*     3.7    33.9    -      -       +      +
    139D  LEU*     3.9    25.1    -      -       +      -
    140D  GLN*     4.6     8.7    -      -       +      -
    143D  LEU*     4.2    10.8    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with PHE 23 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     19B  ALA      2.9    18.8    +      -       -      +
     20B  THR*     3.9     2.7    -      -       +      +
     21B  LEU      3.4     0.2    -      -       -      -
     22B  LEU*     1.3    74.9    -      -       -      +
     24B  VAL*     1.3    62.6    +      -       +      +
     26B  PHE*     4.0     2.3    -      -       -      +
     27B  GLY*     2.8    34.4    +      -       -      -
     48B  PHE*     3.6    44.9    -      +       +      -
     51B  GLY*     4.6     5.2    -      -       -      -
     52B  ILE*     3.5    38.8    -      -       +      -
     55B  LEU*     3.7    13.2    -      -       +      +
     67B  ILE*     3.7    17.0    -      -       +      -
    168B  VAL*     5.0     4.3    -      -       +      -
    172B  HIS*     5.5     1.3    -      -       -      -
    182B  SER      6.0     0.7    -      -       -      -
    184B  ASN*     3.5    26.7    -      -       +      -
    187B  ARG*     4.1    18.4    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with VAL 24 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     20B  THR*     3.0    22.5    +      -       +      +
     21B  LEU      4.2     1.1    -      -       -      +
     23B  PHE*     1.3    82.3    -      -       +      +
     25B  PHE*     1.4    65.6    +      -       -      +
     27B  GLY*     5.1     0.2    -      -       -      -
     28B  LEU*     3.0    56.1    +      -       +      +
     48B  PHE*     6.0     0.7    -      -       -      -
     97B  ALA*     3.3    41.3    -      -       +      +
    101B  ALA      3.7     8.5    -      -       -      +
    187B  ARG*     4.0    24.2    -      -       +      -
    190B  ALA*     3.8     7.2    -      -       +      -
    191B  PRO*     5.4     0.2    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with PHE 25 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     21B  LEU*     3.0    23.9    +      -       +      +
     22B  LEU*     3.8     4.0    -      -       -      +
     24B  VAL*     1.4    78.3    -      -       -      +
     26B  PHE*     1.4    76.5    +      +       -      +
     29B  GLY*     3.4    18.0    +      -       -      -
    100B  GLY*     3.7    23.8    +      -       -      +
    103B  LEU*     3.7    21.8    -      -       +      -
    104B  LEU*     3.8    21.3    -      -       +      +
    107B  ILE*     3.7    40.2    -      -       +      -
    132D  THR      5.5     0.2    -      -       -      -
    133D  VAL*     4.7    10.8    -      -       +      -
    136D  PHE*     3.7    34.3    -      +       +      -
    174D  LEU*     3.7    23.8    -      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with PHE 26 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     22B  LEU*     3.0    38.9    +      -       +      +
     23B  PHE*     4.1     2.7    -      -       -      +
     25B  PHE*     1.4    91.6    -      +       -      +
     27B  GLY*     1.3    63.5    +      -       -      +
     29B  GLY      4.0     0.2    -      -       -      -
     30B  SER*     2.8    32.9    +      -       -      -
     47B  ALA*     4.8     2.4    -      -       -      +
     51B  GLY*     5.8     1.8    -      -       -      -
    136D  PHE      3.5    27.4    -      -       -      -
    137D  LEU*     3.5    31.4    -      -       +      -
    140D  GLN*     3.5    21.3    -      -       +      -
    170D  LEU*     3.9    38.6    -      -       +      -
    171D  GLY*     4.0    13.2    -      -       -      -
    174D  LEU*     3.8    16.3    -      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with GLY 27 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     23B  PHE      2.8    22.8    +      -       -      -
     26B  PHE*     1.3    75.0    -      -       -      +
     28B  LEU*     1.4    60.3    +      -       -      +
     30B  SER*     3.5     4.0    +      -       -      -
     31B  ALA      3.4    12.0    +      -       -      -
     44B  ILE*     5.3     0.2    -      -       -      +
     47B  ALA*     4.9     1.5    -      -       -      +
     48B  PHE*     3.3    49.4    -      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with LEU 28 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     24B  VAL*     3.0    40.1    +      -       +      +
     27B  GLY*     1.4    72.1    -      -       -      +
     29B  GLY*     1.3    58.3    +      -       -      +
     31B  ALA*     2.9    19.8    +      -       -      +
     32B  LEU*     3.1    15.4    +      -       -      +
     48B  PHE*     4.3     2.9    -      -       +      -
    101B  ALA*     4.2     9.0    -      -       +      -
    104B  LEU*     3.7    16.4    -      -       +      -
    116B  LEU*     3.7    15.7    -      -       +      +
    117B  ALA*     3.6    19.1    -      -       +      +
    187B  ARG*     3.5    48.2    -      -       +      +
    191B  PRO*     3.8    19.1    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with GLY 29 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     25B  PHE      3.4     8.1    +      -       -      -
     28B  LEU*     1.3    78.7    -      -       -      +
     30B  SER*     1.3    54.5    +      -       -      +
     31B  ALA      3.7     0.2    +      -       -      -
     32B  LEU*     3.8     6.0    -      -       -      +
     34B  TRP*     3.1    31.7    +      -       -      -
    104B  LEU*     3.5    20.3    -      -       -      +
    174D  LEU*     3.5    26.5    -      -       -      +
    177D  HIS*     4.5     1.0    +      -       -      -
    178D  TYR*     4.8     0.2    -      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with SER 30 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     26B  PHE*     2.8    23.1    +      -       -      +
     27B  GLY      3.5     2.0    +      -       -      -
     29B  GLY*     1.3    75.0    -      -       -      +
     31B  ALA*     1.4    57.7    +      -       -      +
     32B  LEU      3.5     0.4    -      -       -      -
     34B  TRP*     4.6     3.3    +      -       -      +
     39B  PRO*     3.5    25.3    -      -       -      +
     43B  GLN*     4.5     6.1    +      -       -      +
     44B  ILE*     4.1     5.0    -      -       -      +
     47B  ALA*     3.5    28.5    -      -       -      +
    170D  LEU*     5.0     1.2    +      -       -      +
    173D  LEU*     3.4    35.0    +      -       -      +
    174D  LEU*     3.6     6.1    +      -       -      +
    177D  HIS*     4.7     1.4    -      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with ALA 31 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     27B  GLY      3.4    12.2    +      -       -      +
     28B  LEU      2.9     9.5    +      -       -      +
     30B  SER*     1.4    75.9    -      -       -      +
     32B  LEU*     1.4    64.9    +      -       -      +
     33B  ASN*     3.8     5.9    +      -       -      +
     39B  PRO*     4.3     4.5    -      -       -      +
     44B  ILE*     4.0    34.0    -      -       +      +
     48B  PHE*     4.2     5.4    -      -       +      -
    117B  ALA*     3.8    20.7    -      -       +      +
    187B  ARG*     5.4     0.9    -      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with LEU 32 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     28B  LEU      3.1    16.5    +      -       -      +
     29B  GLY*     3.8    18.6    -      -       -      +
     30B  SER      3.5     1.6    -      -       -      -
     31B  ALA*     1.4    79.9    -      -       -      +
     33B  ASN*     1.3    62.4    +      -       -      +
     34B  TRP*     3.0    36.8    +      -       +      +
     39B  PRO*     3.2     7.8    -      -       -      +
    104B  LEU*     4.5     4.9    -      -       +      -
    108B  THR*     3.7    35.0    -      -       +      +
    112B  ILE*     4.1    10.1    -      -       +      +
    113B  ARG*     3.4    22.7    -      -       -      +
    116B  LEU*     3.6    31.2    -      -       +      -
    117B  ALA*     4.0     3.4    -      -       -      +
----------------------------------------------------------
 Back to top of page


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