Contacts of the helix formed by residues 103 - 128 (chain H) in PDB entry 3V3K


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 THR 103 (chain H).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     98H  LEU*     4.2    10.9    -      -       -      +
    101H  GLY      5.8     1.3    -      -       -      -
    102H  MET*     1.3    77.7    -      -       -      +
    104H  ILE*     1.3    64.0    +      -       -      +
    105H  GLU*     3.4    23.6    +      -       -      +
    106H  ASP*     3.0    33.7    +      -       -      +
    107H  ARG      3.5     4.2    +      -       -      -
    163J  GLY      5.8     3.4    -      -       -      +
    166J  ASP*     4.8    12.8    -      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ILE 104 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     26H  PRO*     4.9    19.5    -      -       +      +
     98H  LEU*     5.1     4.0    -      -       +      -
    103H  THR*     1.3    71.6    -      -       -      +
    105H  GLU*     1.3    59.8    +      -       +      +
    106H  ASP      3.3     0.2    -      -       -      -
    107H  ARG*     3.2    44.6    +      -       -      +
    108H  ASP*     3.1    33.3    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with GLU 105 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    103H  THR*     3.2    13.7    +      -       -      +
    104H  ILE*     1.3    78.3    -      -       +      +
    106H  ASP*     1.3    57.2    +      -       -      +
    108H  ASP*     4.0     7.3    -      -       -      +
    109H  SER*     3.1    28.6    +      -       -      -
    112H  ARG*     5.2     1.6    +      -       -      -
    166J  ASP*     3.2    39.6    -      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ASP 106 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     83H  VAL*     3.8    16.6    -      -       +      +
    101H  GLY      5.2     0.2    -      -       -      +
    102H  MET*     3.4    43.0    -      -       +      +
    103H  THR*     3.0    37.9    +      -       -      +
    104H  ILE      3.3     0.4    -      -       -      -
    105H  GLU*     1.3    74.6    -      -       -      +
    107H  ARG*     1.3    65.5    +      -       -      +
    109H  SER*     2.7    20.3    +      -       -      -
    110H  TYR*     3.5     5.2    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ARG 107 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     25H  THR      3.2    26.3    +      -       -      -
     26H  PRO*     3.4    21.4    +      -       -      +
     27H  GLU      3.8     9.9    -      -       -      +
     28H  SER*     3.9     1.3    +      -       -      +
     29H  VAL*     3.3    29.7    -      -       -      +
     33H  ASN*     4.4    12.9    -      -       -      +
     83H  VAL*     4.2     1.7    -      -       -      +
     84H  PHE*     3.9    29.3    -      -       +      -
     98H  LEU*     4.4     7.6    -      -       +      -
    103H  THR      3.5     6.0    +      -       -      +
    104H  ILE*     3.2    37.0    +      -       -      +
    106H  ASP*     1.3    77.6    -      -       -      +
    108H  ASP*     1.3    87.7    +      -       -      +
    110H  TYR*     3.2     7.1    +      -       -      +
    111H  ILE*     3.2    31.2    +      -       +      +
    177H  PRO*     4.8     1.3    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with ASP 108 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     33H  ASN*     5.3     0.7    +      -       -      -
     35H  ASN*     4.1    30.0    +      -       +      +
     36H  HIS*     2.9    33.6    +      -       +      +
    104H  ILE*     3.1    23.4    +      -       -      +
    105H  GLU*     4.1     7.0    -      -       -      +
    107H  ARG*     1.3   103.9    +      -       -      +
    109H  SER*     1.3    56.7    +      -       -      +
    111H  ILE*     3.3     6.5    +      -       -      +
    112H  ARG*     3.0    36.8    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with SER 109 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     79H  LYS*     3.2    23.2    +      -       -      -
    105H  GLU      3.1    13.0    +      -       -      -
    106H  ASP*     2.7    30.7    +      -       -      -
    108H  ASP*     1.3    73.9    -      -       -      +
    110H  TYR*     1.3    61.1    +      -       -      +
    112H  ARG*     3.7    28.9    +      -       -      +
    113H  ASP*     3.1    28.1    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with TYR 110 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     76H  LEU*     3.4    54.5    -      -       +      +
     79H  LYS*     4.2    15.0    -      -       +      +
     80H  ARG*     3.5    34.1    +      -       +      -
     83H  VAL*     5.2     1.1    -      -       +      -
     84H  PHE*     3.8    25.1    -      +       +      -
    106H  ASP      4.0     7.4    -      -       -      +
    107H  ARG      3.2     9.2    +      -       -      +
    109H  SER*     1.3    80.7    +      -       -      +
    111H  ILE*     1.3    61.4    +      -       +      +
    113H  ASP*     3.1     6.9    +      -       -      +
    114H  LEU*     2.8    48.4    +      -       +      +
    150H  LEU*     5.0     2.9    -      -       -      +
    153H  ASP*     2.7    30.8    +      -       -      +
    177H  PRO*     4.3    10.5    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with ILE 111 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     29H  VAL*     3.8     9.0    -      -       +      -
     32H  LEU*     4.3     3.8    -      -       +      -
     36H  HIS*     3.1    46.9    -      -       +      +
    107H  ARG*     3.2    27.9    +      -       +      +
    108H  ASP*     3.3     9.2    +      -       -      +
    110H  TYR*     1.3    82.1    -      -       +      +
    112H  ARG*     1.3    56.2    +      -       -      +
    114H  LEU*     3.4     7.9    -      -       +      +
    115H  PHE*     2.7    33.1    +      -       +      +
    157H  MET*     4.7     5.4    -      -       -      -
    176H  VAL*     3.3    44.4    -      -       +      +
    177H  PRO*     4.5     6.7    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with ARG 112 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     35H  ASN*     3.3    28.0    -      -       -      +
     36H  HIS*     4.1     9.6    +      -       -      +
     37H  PHE      3.6    16.3    +      -       -      +
     38H  LEU*     4.0     6.8    -      -       -      +
     39H  SER*     4.4    18.7    +      -       -      +
     41H  GLU*     5.6     4.0    +      -       -      -
     42H  LEU*     4.2    19.6    -      -       +      +
    105H  GLU      5.2     1.2    +      -       -      -
    108H  ASP*     3.0    19.4    +      -       -      +
    109H  SER*     3.7    30.0    +      -       -      +
    111H  ILE*     1.3    76.1    -      -       -      +
    113H  ASP*     1.3    60.6    +      -       -      +
    115H  PHE*     3.2     4.5    +      -       -      +
    116H  PHE*     3.1    25.8    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ASP 113 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     42H  LEU*     4.0    15.3    -      -       -      +
     72H  PHE*     3.9    29.7    -      -       +      -
     76H  LEU*     3.4    24.7    -      -       +      +
     79H  LYS*     3.3    24.0    +      -       -      +
    109H  SER      3.1    15.5    +      -       -      +
    110H  TYR      3.1     5.4    +      -       -      +
    112H  ARG*     1.3    79.1    +      -       -      +
    114H  LEU*     1.3    61.9    +      -       -      +
    116H  PHE*     3.4     7.1    +      -       -      +
    117H  LEU*     3.4    24.3    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with LEU 114 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     76H  LEU*     4.5     3.7    -      -       +      +
    110H  TYR*     2.8    37.8    +      -       +      +
    111H  ILE*     3.4    13.9    -      -       +      +
    113H  ASP*     1.3    75.3    -      -       -      +
    115H  PHE*     1.3    62.8    +      -       -      +
    117H  LEU*     3.5     7.5    +      -       +      +
    118H  HIS*     3.3    20.3    +      -       -      +
    150H  LEU*     4.1    19.5    -      -       +      -
    153H  ASP*     3.7    30.5    -      -       +      +
    154H  LEU*     4.1     9.5    -      -       +      +
    157H  MET*     3.4    23.4    -      -       +      +
    176H  VAL*     3.3    26.9    -      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with PHE 115 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     32H  LEU*     4.3     9.2    -      -       +      -
     36H  HIS*     3.9    20.2    -      -       +      +
     37H  PHE*     5.2     3.1    -      +       -      -
     38H  LEU*     3.6    34.5    -      -       +      -
    111H  ILE*     2.7    16.8    +      -       +      +
    112H  ARG      3.2     9.6    +      -       -      +
    114H  LEU*     1.3    71.6    -      -       -      +
    116H  PHE*     1.3    57.9    +      -       -      +
    118H  HIS*     3.3     3.7    +      -       -      +
    119H  SER*     2.8    42.4    +      -       -      -
    157H  MET*     3.4    31.8    -      -       +      +
    161H  VAL*     4.2    15.5    -      -       +      -
    220K  ARG*     3.5    45.8    -      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with PHE 116 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     38H  LEU*     3.8     8.4    -      -       +      +
     42H  LEU*     3.4    39.7    -      -       +      -
     45H  LYS*     4.1    12.1    -      -       +      -
     46H  LEU*     3.6    26.4    -      -       +      +
     49H  MET*     3.6    27.6    -      -       +      -
     69H  LEU*     4.6     4.5    -      -       +      -
     72H  PHE*     3.7    36.6    -      +       +      -
    112H  ARG      3.1    11.8    +      -       -      +
    113H  ASP*     3.5    13.0    -      -       -      +
    114H  LEU      3.3     0.2    -      -       -      -
    115H  PHE*     1.3    76.7    -      -       -      +
    117H  LEU*     1.3    58.9    +      -       +      +
    119H  SER*     3.3     5.7    +      -       -      -
    120H  LEU*     3.0    55.7    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with LEU 117 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     69H  LEU*     4.1    12.1    -      -       +      -
     72H  PHE*     4.2    12.3    -      -       +      -
     73H  VAL*     3.8    26.7    -      -       +      -
     76H  LEU*     4.2    19.1    -      -       +      -
    113H  ASP      3.4    13.2    +      -       -      +
    114H  LEU*     3.8     9.4    -      -       -      +
    115H  PHE      3.4     0.4    -      -       -      -
    116H  PHE*     1.3    79.8    -      -       +      +
    118H  HIS*     1.3    62.0    +      -       -      +
    120H  LEU*     4.0     1.3    -      -       +      +
    121H  LYS*     3.2    24.6    +      -       -      +
    142H  LEU*     3.4    33.7    -      -       +      +
    150H  LEU*     4.0    28.3    -      -       +      -
    154H  LEU*     4.0    14.0    -      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with HIS 118 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    114H  LEU      3.3    11.5    +      -       -      +
    115H  PHE*     3.7    10.5    +      -       -      +
    116H  PHE      3.3     0.4    -      -       -      -
    117H  LEU*     1.3    78.3    -      -       -      +
    119H  SER*     1.3    60.7    +      -       -      +
    121H  LYS*     3.1    10.5    +      -       +      +
    122H  VAL*     3.0    51.6    +      -       +      +
    154H  LEU*     4.1    16.5    -      -       +      +
    157H  MET*     3.9    18.4    -      -       +      +
    158H  LYS*     3.7    41.3    -      -       +      +
    161H  VAL*     4.0    28.9    -      -       +      +
    162H  GLU*     4.3     8.4    +      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with SER 119 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     38H  LEU*     3.9     6.0    -      -       -      +
     46H  LEU*     3.2    26.1    -      -       -      +
    115H  PHE*     2.8    38.0    +      -       -      -
    116H  PHE*     3.3     3.8    +      -       -      -
    118H  HIS*     1.3    79.3    +      -       -      +
    120H  LEU*     1.3    63.8    +      -       -      +
    122H  VAL*     3.6     7.2    +      -       -      +
    123H  LYS*     3.3    30.8    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with LEU 120 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     46H  LEU*     4.2    14.1    -      -       +      +
     49H  MET*     3.8    30.3    -      -       +      -
     50H  VAL*     5.3     6.4    -      -       +      +
     69H  LEU*     4.1    14.8    -      -       +      -
    116H  PHE*     3.0    49.8    +      -       +      +
    117H  LEU*     4.0     4.0    -      -       -      +
    119H  SER*     1.3    76.0    +      -       -      +
    121H  LYS*     1.3    62.2    +      -       -      +
    123H  LYS*     3.5     5.5    +      -       -      +
    124H  ILE*     3.1    39.9    +      -       +      +
    138H  VAL*     5.4     0.2    -      -       +      -
    142H  LEU*     3.3    24.7    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with LYS 121 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    117H  LEU      3.2    18.3    +      -       -      +
    118H  HIS*     3.1    11.5    +      -       +      +
    120H  LEU*     1.3    75.4    -      -       -      +
    122H  VAL*     1.3    59.6    +      -       -      +
    124H  ILE*     3.5     3.1    +      -       -      +
    125H  GLU*     3.0    47.2    +      -       -      +
    139H  TYR*     4.0    11.2    -      -       +      -
    142H  LEU*     2.8    48.7    +      -       +      +
    143H  CYS*     3.5    27.6    -      -       -      +
    144H  PRO*     4.9     1.4    -      -       -      +
    154H  LEU*     5.3     8.9    -      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with VAL 122 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    118H  HIS*     3.0    46.1    +      -       +      +
    119H  SER*     3.8     9.0    -      -       -      +
    120H  LEU      3.3     0.2    -      -       -      -
    121H  LYS*     1.3    78.3    -      -       +      +
    123H  LYS*     1.3    59.6    +      -       +      +
    125H  GLU*     3.4    12.8    +      -       -      +
    126H  GLU*     3.1    38.7    +      -       +      +
    162H  GLU*     4.4    12.8    -      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with LYS 123 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     43H  GLN*     4.7     5.9    -      -       -      +
     46H  LEU*     3.4    25.2    -      -       +      +
     47H  ASP*     3.7    14.6    +      -       -      -
     50H  VAL*     3.5    40.9    -      -       +      +
    119H  SER*     3.3    16.4    +      -       -      +
    120H  LEU      3.9     4.0    -      -       -      +
    121H  LYS      3.4     0.2    -      -       -      -
    122H  VAL*     1.3    76.3    -      -       +      +
    124H  ILE*     1.3    65.5    +      -       -      +
    126H  GLU*     3.4    20.5    +      -       -      +
    127H  SER*     3.3    23.6    +      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with ILE 124 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     50H  VAL*     6.2     3.8    -      -       +      -
     53H  TYR*     3.8    42.4    -      -       +      +
    120H  LEU*     3.1    40.9    +      -       +      +
    121H  LYS*     3.9     4.9    -      -       -      +
    122H  VAL      3.4     0.2    -      -       -      -
    123H  LYS*     1.3    72.6    -      -       +      +
    125H  GLU*     1.3    59.1    +      -       -      +
    127H  SER*     3.2     7.8    +      -       -      +
    128H  ARG*     3.0    30.6    +      -       -      +
    138H  VAL*     4.2    20.0    -      -       +      -
    139H  TYR*     3.6    28.0    -      -       +      -
    142H  LEU*     4.1     9.2    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with GLU 125 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    121H  LYS*     3.0    36.4    +      -       -      +
    122H  VAL*     3.6    10.4    -      -       -      +
    123H  LYS      3.4     0.2    -      -       -      -
    124H  ILE*     1.3    75.0    -      -       -      +
    126H  GLU*     1.3    57.4    +      -       -      +
    128H  ARG*     2.9    25.8    -      -       -      +
    129H  GLN*     4.0     5.2    +      -       -      +
    139H  TYR*     2.7    36.5    +      -       +      +
    158H  LYS*     5.9     0.7    +      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with GLU 126 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    122H  VAL*     3.1    25.4    +      -       +      +
    123H  LYS*     3.6    25.1    -      -       -      +
    124H  ILE      3.2     0.4    -      -       -      -
    125H  GLU*     1.3    75.5    -      -       -      +
    127H  SER*     1.3    62.2    +      -       -      +
    129H  GLN*     3.4    28.8    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with SER 127 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     50H  VAL*     5.5     3.3    +      -       -      +
     53H  TYR*     4.5    16.8    -      -       -      -
     54H  SER*     4.3    20.4    -      -       -      -
    123H  LYS      3.3    12.7    +      -       -      -
    124H  ILE*     3.2    11.4    +      -       -      -
    126H  GLU*     1.3    79.4    -      -       -      +
    128H  ARG*     1.3    58.4    +      -       -      +
    129H  GLN*     3.1     9.9    +      -       -      +
    130H  GLY      5.0     0.2    +      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with ARG 128 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     53H  TYR*     3.5    26.5    -      -       +      +
    124H  ILE*     3.0    22.4    +      -       -      +
    125H  GLU*     2.9    20.1    -      -       -      +
    127H  SER*     1.3    72.9    -      -       -      +
    129H  GLN*     1.3    59.5    +      -       -      +
    131H  LYS      4.2    17.1    +      -       -      +
    132H  GLU*     2.7    34.6    +      -       -      +
    134H  SER*     4.0    18.3    -      -       -      +
    135H  LYS*     4.3     4.9    -      -       -      +
    136H  CYS*     3.5    17.6    -      -       -      +
    139H  TYR*     3.2    46.9    -      -       -      +
    140H  ASN*     5.1     0.8    +      -       -      -
----------------------------------------------------------
 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