Contacts of the helix formed by residues 101 - 128 (chain F) in PDB entry 2YW7


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 101 (chain F).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     42F  VAL*     4.4     0.2    -      -       -      -
     43F  VAL*     3.7     9.9    -      -       +      +
    100F  ASP*     1.3    92.3    +      -       -      +
    102F  VAL*     1.3    57.5    +      -       -      +
    103F  GLN*     3.6    11.5    +      -       -      +
    104F  ALA*     2.8    35.3    +      -       -      +
    105F  HIS*     3.1    16.9    +      -       -      -
    157J  GLU*     3.8    29.6    -      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with VAL 102 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     42F  VAL*     4.0     9.9    -      -       +      -
     43F  VAL      3.7    15.1    +      -       -      +
     44F  GLY*     4.3     6.5    -      -       -      -
     45F  PRO*     4.5     4.5    -      -       +      -
     46F  ASN*     3.9    28.9    -      -       -      +
     47F  PHE*     3.9    18.2    -      -       +      +
     50F  VAL*     3.4    26.2    -      -       +      -
    101F  THR*     1.3    72.4    -      -       -      +
    103F  GLN*     1.3    65.0    +      -       +      +
    105F  HIS*     3.6     0.5    +      -       -      +
    106F  LEU*     3.1    42.6    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with GLN 103 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    101F  THR*     3.6     8.9    +      -       -      +
    102F  VAL*     1.3    78.7    -      -       +      +
    104F  ALA*     1.3    56.9    +      -       -      +
    106F  LEU*     3.9     5.0    -      -       -      +
    107F  ALA*     2.8    32.8    +      -       -      +
    155F  HIS*     5.1    14.0    -      -       +      -
    156F  LEU*     3.1    36.2    -      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ALA 104 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     97F  VAL*     4.3     7.8    -      -       +      +
    100F  ASP*     3.1    40.4    -      -       +      +
    101F  THR*     2.8    14.4    +      -       -      +
    103F  GLN*     1.3    79.5    -      -       -      +
    105F  HIS*     1.3    61.6    +      -       -      +
    107F  ALA*     3.2     7.2    -      -       -      +
    108F  ALA*     3.1    21.8    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with HIS 105 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     38F  VAL*     3.7    36.8    -      -       +      +
     41F  ASN*     3.5    16.6    +      -       +      -
     42F  VAL*     3.6    23.6    -      -       +      -
     95F  TYR*     3.1    25.4    +      +       -      +
     97F  VAL*     3.4    19.9    -      -       +      +
     98F  GLU      3.2    27.4    +      -       -      -
    100F  ASP*     3.7     9.2    +      -       +      +
    101F  THR      3.1    21.7    +      -       -      +
    102F  VAL      4.3     1.3    -      -       -      +
    104F  ALA*     1.3    71.1    -      -       -      +
    106F  LEU*     1.3    61.9    +      -       +      +
    107F  ALA      2.7     2.5    +      -       -      -
    108F  ALA      2.8     1.7    +      -       -      -
    109F  LEU*     2.5    38.6    +      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with LEU 106 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     50F  VAL*     3.9    27.4    -      -       +      -
     53F  MET*     3.9    22.7    -      -       -      -
    102F  VAL*     3.1    38.7    +      -       +      +
    103F  GLN*     4.2     3.6    -      -       -      +
    105F  HIS*     1.3    77.7    -      -       +      +
    107F  ALA*     1.3    60.3    +      -       -      +
    109F  LEU*     4.0    13.9    -      -       +      -
    110F  ASP*     3.2    23.2    +      -       -      +
    152F  VAL*     3.4    24.2    -      -       +      +
    154F  ALA      6.1     0.2    -      -       -      +
    155F  HIS*     4.3    30.6    +      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with ALA 107 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    103F  GLN      2.8    22.8    +      -       -      +
    104F  ALA*     3.2     9.2    -      -       -      +
    105F  HIS      2.7     4.6    +      -       -      -
    106F  LEU*     1.3    76.4    -      -       -      +
    108F  ALA*     1.3    62.0    +      -       -      +
    110F  ASP*     3.3    16.0    -      -       -      +
    111F  LEU*     3.5    12.5    +      -       -      +
    155F  HIS*     5.2     8.4    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ALA 108 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     95F  TYR*     4.2     8.3    -      -       +      -
     97F  VAL*     3.8    28.5    -      -       +      -
    104F  ALA      3.1     3.7    +      -       -      +
    105F  HIS      2.8     4.2    +      -       -      +
    107F  ALA*     1.3    72.6    -      -       -      +
    109F  LEU*     1.3    55.0    +      -       -      +
    110F  ASP      3.1     2.2    -      -       -      -
    111F  LEU*     3.0    19.6    +      -       +      +
    112F  VAL*     2.8    38.4    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with LEU 109 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     34F  THR*     5.0     4.7    -      -       +      -
     35F  LEU*     4.0    26.2    -      -       +      -
     38F  VAL*     3.6    35.7    -      -       +      -
     53F  MET*     6.1     0.4    -      -       +      -
     54F  ILE*     3.9    13.9    -      -       +      -
     95F  TYR*     4.0    11.9    +      -       -      +
    105F  HIS      2.5    27.3    +      -       -      +
    106F  LEU*     4.0    17.9    -      -       +      +
    108F  ALA*     1.3    72.2    -      -       -      +
    110F  ASP*     1.3    61.5    +      -       -      +
    112F  VAL*     3.4    10.6    +      -       +      +
    113F  TYR*     3.2    41.6    +      -       +      -
    148F  PHE*     5.2     6.1    -      -       +      -
    152F  VAL*     4.4     7.4    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with ASP 110 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    106F  LEU      3.2    13.2    +      -       -      +
    107F  ALA*     3.3    12.4    -      -       -      +
    109F  LEU*     1.3    76.0    -      -       -      +
    111F  LEU*     1.3    73.1    +      -       -      +
    113F  TYR*     3.0    14.3    +      -       -      +
    114F  ASN*     3.1    14.2    +      -       -      -
    149F  GLN*     2.9    33.8    +      -       -      +
    152F  VAL*     4.0    14.1    -      -       +      +
    153F  ARG*     3.0    33.7    +      -       +      +
    155F  HIS*     6.0     3.3    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with LEU 111 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    107F  ALA      3.5    11.0    +      -       -      +
    108F  ALA*     3.0    21.4    +      -       +      +
    110F  ASP*     1.3    88.4    -      -       -      +
    112F  VAL*     1.3    65.3    +      -       +      +
    114F  ASN*     2.9    29.9    +      -       -      +
    115F  GLY      3.5     3.8    +      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with VAL 112 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     30F  ASP*     5.8     3.6    -      -       -      +
     31F  LEU*     3.7    30.7    -      -       +      -
     34F  THR*     5.1     7.2    -      -       +      +
     94F  ASP      5.5     3.6    -      -       -      +
     95F  TYR*     4.1    27.6    -      -       +      -
    108F  ALA*     2.8    20.5    +      -       +      +
    109F  LEU*     3.5    14.6    -      -       +      +
    110F  ASP      3.2     0.2    -      -       -      -
    111F  LEU*     1.3    73.8    -      -       -      +
    113F  TYR*     1.3    57.6    +      -       +      +
    115F  GLY*     3.8     0.7    +      -       -      -
    116F  VAL*     3.0    37.9    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with TYR 113 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     31F  LEU*     3.7    35.8    -      -       +      +
     35F  LEU*     4.1     2.5    -      -       +      +
     57F  GLN*     2.5    46.6    +      -       -      +
    109F  LEU*     3.2    32.1    +      -       +      +
    110F  ASP*     3.0    10.8    +      -       -      +
    112F  VAL*     1.3    75.9    -      -       +      +
    114F  ASN*     1.3    59.6    +      -       -      +
    116F  VAL*     4.0     9.2    -      -       +      -
    117F  ILE*     3.0    34.5    +      -       +      +
    145F  LEU*     3.4    36.8    -      -       +      -
    148F  PHE*     3.3    27.5    -      +       -      -
    149F  GLN*     3.8    19.1    -      -       +      +
    152F  VAL*     5.2     1.6    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with ASN 114 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    110F  ASP*     3.1    16.6    +      -       -      -
    111F  LEU*     2.9    22.4    +      -       +      +
    113F  TYR*     1.3    74.5    -      -       -      +
    115F  GLY*     1.3    54.6    -      -       -      +
    117F  ILE*     3.0     5.8    +      -       -      +
    118F  GLU*     2.7    50.2    +      -       -      +
    149F  GLN*     3.2    21.0    +      -       -      +
    153F  ARG*     3.2    28.6    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with GLY 115 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     92F  TRP*     6.3     2.2    -      -       -      -
    111F  LEU      3.5     5.9    +      -       -      -
    112F  VAL      4.4     0.9    -      -       -      -
    114F  ASN*     1.3    78.0    -      -       -      +
    116F  VAL*     1.3    54.1    +      -       -      +
    118F  GLU*     3.2    18.6    -      -       -      +
    119F  ASP*     2.7    42.7    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with VAL 116 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     27F  THR*     4.1    28.8    -      -       +      +
     28F  TYR*     5.6     1.3    -      -       +      -
     31F  LEU*     4.6    18.8    -      -       +      -
     92F  TRP*     6.0    10.8    -      -       +      -
    112F  VAL*     3.0    36.1    +      -       +      +
    113F  TYR*     4.0    11.2    -      -       +      +
    114F  ASN      3.1     0.6    -      -       -      -
    115F  GLY*     1.3    75.3    -      -       -      +
    117F  ILE*     1.3    53.6    +      -       +      +
    119F  ASP*     3.6     6.3    -      -       -      +
    120F  THR*     2.5    34.1    +      -       -      -
    145F  LEU*     4.0    25.6    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with ILE 117 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    113F  TYR*     3.0    19.5    +      -       -      +
    114F  ASN*     3.0     4.7    +      -       -      +
    116F  VAL*     1.3    74.4    -      -       +      +
    118F  GLU*     1.3    56.8    +      -       -      +
    120F  THR*     3.7     8.5    -      -       -      -
    121F  ARG*     2.6    63.5    +      -       +      +
    142F  ALA*     4.7     6.7    -      -       +      +
    145F  LEU*     3.3    48.0    -      -       +      +
    146F  GLU*     3.6    25.6    -      -       +      +
    149F  GLN*     4.0    14.8    -      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with GLU 118 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    114F  ASN*     2.7    31.7    +      -       +      +
    115F  GLY*     3.2    20.9    +      -       -      +
    117F  ILE*     1.3    73.0    -      -       -      +
    119F  ASP*     1.3    64.0    +      -       -      +
    121F  ARG*     3.2     8.5    +      -       -      +
    122F  LYS*     3.1    39.2    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ASP 119 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     23F  LYS*     6.0     2.3    -      -       -      +
     24F  GLN*     4.8     6.4    +      -       -      +
     27F  THR*     4.6     9.8    +      -       -      +
     91F  THR*     4.3    17.5    -      -       -      +
     92F  TRP*     4.1    23.2    -      -       +      -
    115F  GLY*     2.7    25.7    +      -       -      +
    116F  VAL*     3.6     6.5    -      -       -      +
    118F  GLU*     1.3    71.8    -      -       -      +
    120F  THR*     1.3    63.4    +      -       -      +
    122F  LYS*     3.1    21.1    +      -       -      +
    123F  SER*     3.0    24.7    +      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with THR 120 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     24F  GLN*     3.1    30.4    +      -       -      +
     28F  TYR*     4.8     1.3    -      -       -      +
    116F  VAL*     2.5    23.7    +      -       -      +
    117F  ILE*     3.1    12.7    +      -       -      -
    119F  ASP*     1.3    76.3    -      -       -      +
    121F  ARG*     1.3    58.1    +      -       -      +
    123F  SER*     3.1     5.1    +      -       -      +
    124F  ILE*     2.9    31.3    +      -       +      +
    138F  LEU*     3.8    29.2    -      -       +      +
    142F  ALA*     4.1    17.3    -      -       +      +
    145F  LEU*     3.9    12.2    -      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ARG 121 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    117F  ILE*     2.6    47.3    +      -       +      +
    118F  GLU*     3.5     7.6    -      -       -      +
    120F  THR*     1.3    71.7    -      -       -      +
    122F  LYS*     1.3    60.2    +      -       +      +
    124F  ILE*     2.9    36.4    -      -       -      +
    125F  GLU*     3.5    10.2    +      -       -      +
    139F  ILE*     4.9    12.3    -      -       -      +
    142F  ALA*     4.0    22.3    -      -       -      +
    146F  GLU*     4.8    11.0    +      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with LYS 122 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    118F  GLU*     3.1    41.2    +      -       -      +
    119F  ASP*     3.3    20.5    +      -       -      +
    120F  THR      3.1     0.2    -      -       -      -
    121F  ARG*     1.3    74.1    -      -       +      +
    123F  SER*     1.3    54.2    +      -       -      +
    125F  GLU*     2.8    17.6    +      -       +      +
    126F  LYS*     2.5    51.0    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with SER 123 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     20F  LEU*     4.2    23.8    +      -       -      +
     23F  LYS*     5.6     4.0    -      -       -      +
     24F  GLN*     4.2    11.6    +      -       -      -
    119F  ASP      3.0    11.1    +      -       -      -
    120F  THR      3.1     7.2    +      -       -      -
    122F  LYS*     1.3    77.6    -      -       -      +
    124F  ILE*     1.3    57.1    -      -       -      +
    126F  LYS*     3.6    12.1    -      -       -      +
    127F  LEU*     2.9    38.4    +      -       -      +
    138F  LEU*     3.8    21.1    -      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with ILE 124 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    120F  THR*     2.9    21.1    +      -       +      +
    121F  ARG*     2.9    52.3    -      -       -      +
    123F  SER*     1.3    75.2    -      -       -      +
    125F  GLU*     1.3    58.4    +      -       +      +
    127F  LEU*     3.7     7.7    -      -       -      +
    128F  GLU      3.4     2.1    +      -       -      -
    135F  GLN*     2.8    79.1    +      -       +      +
    138F  LEU*     4.6     5.2    -      -       +      +
    139F  ILE*     3.5    34.8    -      -       +      +
    142F  ALA*     5.7     0.4    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with GLU 125 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    121F  ARG      3.9     7.9    -      -       -      +
    122F  LYS*     2.8    33.9    +      -       -      +
    124F  ILE*     1.3    73.6    -      -       -      +
    126F  LYS*     1.3    66.1    +      -       -      +
    127F  LEU      2.9    11.4    +      -       -      -
    128F  GLU*     3.1    22.9    +      -       +      +
    129F  ASP      4.9     0.3    +      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with LYS 126 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     20F  LEU*     3.9    32.6    -      -       +      +
     23F  LYS*     5.2     9.0    -      -       -      +
    122F  LYS*     2.5    36.5    +      -       +      +
    123F  SER*     3.6     9.2    -      -       -      +
    125F  GLU*     1.3    81.5    -      -       -      +
    127F  LEU*     1.3    59.6    +      -       -      +
    130F  LEU*     3.7    17.0    -      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with LEU 127 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     17F  VAL*     4.1    21.3    -      -       +      -
     20F  LEU*     3.8    20.4    -      -       +      -
     21F  LEU*     5.2     2.0    -      -       +      -
    123F  SER      2.9    26.7    +      -       -      +
    124F  ILE*     3.7     5.6    -      -       -      +
    125F  GLU      2.9     1.7    -      -       -      -
    126F  LYS*     1.3    79.8    -      -       -      +
    128F  GLU*     1.3    51.8    +      -       -      +
    129F  ASP*     2.5     6.6    +      -       -      +
    130F  LEU*     2.4    38.3    +      -       +      +
    131F  ASP*     3.8    18.8    -      -       +      +
    134F  SER*     3.4    29.6    -      -       -      +
    135F  GLN*     3.6    21.3    -      -       +      -
    138F  LEU*     4.1    16.6    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with GLU 128 (chain F). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    124F  ILE      3.4     1.1    +      -       -      +
    125F  GLU*     3.1    17.3    +      -       -      +
    127F  LEU*     1.3    72.5    -      -       -      +
    129F  ASP*     1.3    74.1    +      -       -      +
    131F  ASP      4.5     5.6    +      -       -      +
    132F  LEU*     4.4    22.5    +      -       -      +
    135F  GLN*     3.1    32.1    +      -       -      +
----------------------------------------------------------
 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