Contacts of the helix formed by residues 102 - 127 (chain A) 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 VAL 102 (chain A).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     42A  VAL*     3.7    20.6    -      -       +      -
     43A  VAL      3.3    16.4    +      -       -      +
     44A  GLY*     4.9     1.8    -      -       -      -
     46A  ASN*     4.1    12.3    -      -       +      +
     47A  PHE*     3.8    22.4    -      -       -      +
     50A  VAL*     3.3    21.8    -      -       +      -
    101A  THR*     1.3    68.5    -      -       -      +
    103A  GLN*     1.3    71.0    +      -       +      +
    104A  ALA      2.4    17.8    +      -       -      -
    105A  HIS*     3.1     9.9    +      -       -      -
    106A  LEU*     3.1    33.5    +      -       +      +
    155A  HIS*     5.7     1.1    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with GLN 103 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     46A  ASN*     5.7     4.5    -      -       -      +
    101A  THR*     3.4     9.0    +      -       +      +
    102A  VAL*     1.3    89.3    -      -       +      +
    104A  ALA*     1.3    56.3    +      -       -      +
    106A  LEU*     5.0     0.4    -      -       -      +
    107A  ALA*     4.4    11.3    -      -       -      +
    155A  HIS*     3.5    24.2    +      -       -      +
    156A  LEU*     4.4    18.6    +      -       +      +
     45G  PRO*     4.2    19.5    -      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ALA 104 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     97A  VAL*     4.9     5.9    -      -       +      +
    100A  ASP*     4.1    17.3    -      -       +      +
    101A  THR*     3.0    28.0    -      -       -      +
    102A  VAL      2.4     7.3    +      -       -      -
    103A  GLN*     1.3    74.3    -      -       -      +
    105A  HIS*     1.3    64.1    +      -       -      +
    106A  LEU      3.3     0.7    -      -       -      -
    107A  ALA*     3.1     8.9    +      -       -      +
    108A  ALA*     3.0    22.9    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with HIS 105 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     38A  VAL*     3.7    18.1    -      -       +      +
     41A  ASN*     3.7    18.3    -      -       +      +
     42A  VAL*     3.4    28.0    -      -       +      -
     50A  VAL*     5.6     1.3    -      -       +      -
     95A  TYR*     3.1    27.2    +      +       -      +
     97A  VAL*     3.5    20.6    -      -       +      +
     98A  GLU      2.8    29.5    +      -       -      -
    100A  ASP*     3.2    35.1    +      -       +      +
    101A  THR      3.0    16.4    +      -       -      +
    102A  VAL*     4.2     1.6    -      -       -      +
    104A  ALA*     1.3    73.6    -      -       -      +
    106A  LEU*     1.3    53.2    +      -       +      +
    108A  ALA*     3.4     0.4    +      -       -      -
    109A  LEU*     2.7    38.1    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with LEU 106 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     50A  VAL*     4.2    14.6    -      -       +      -
     53A  MET*     3.8    31.0    -      -       +      -
    102A  VAL*     3.1    40.3    +      -       +      +
    103A  GLN*     5.0     0.7    -      -       -      +
    105A  HIS*     1.3    76.6    -      -       +      +
    107A  ALA*     1.3    54.0    +      -       -      +
    109A  LEU*     4.0     9.9    -      -       +      -
    110A  ASP*     2.6    32.1    +      -       -      +
    152A  VAL*     3.2    32.4    -      -       +      +
    155A  HIS*     3.7    33.2    -      -       +      +
    156A  LEU*     4.1    13.7    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with ALA 107 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    103A  GLN      4.4     6.3    -      -       -      +
    104A  ALA*     3.1    20.4    +      -       -      +
    106A  LEU*     1.3    77.6    -      -       -      +
    108A  ALA*     1.3    61.6    +      -       -      +
    110A  ASP*     3.2    19.5    -      -       -      +
    111A  LEU*     3.3    13.2    +      -       -      +
    156A  LEU*     4.0    20.6    -      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ALA 108 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     95A  TYR*     3.6    24.5    -      -       +      +
     96A  SER*     5.8     1.6    -      -       -      +
     97A  VAL*     3.7    19.5    -      -       +      -
    104A  ALA      3.0     9.2    +      -       -      +
    107A  ALA*     1.3    76.7    -      -       -      +
    109A  LEU*     1.3    57.5    +      -       -      +
    111A  LEU*     3.3    13.0    +      -       -      +
    112A  VAL*     3.0    29.1    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with LEU 109 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     31A  LEU*     5.5     0.9    -      -       +      -
     34A  THR*     4.5     7.6    -      -       +      -
     35A  LEU*     3.7    32.3    -      -       +      -
     38A  VAL*     4.0    30.3    -      -       +      -
     50A  VAL*     5.8     0.4    -      -       +      -
     54A  ILE*     4.8     5.4    -      -       +      -
     95A  TYR*     4.0     7.6    +      -       +      -
    105A  HIS*     2.7    23.1    +      -       +      +
    106A  LEU*     3.7    13.0    -      -       +      +
    108A  ALA*     1.3    71.3    -      -       -      +
    110A  ASP*     1.3    66.0    +      -       -      +
    112A  VAL*     3.5    10.2    +      -       +      +
    113A  TYR*     3.2    39.9    +      -       +      -
    148A  PHE*     4.2    18.8    -      -       +      -
    152A  VAL*     4.4     7.9    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with ASP 110 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    106A  LEU      2.6    17.9    +      -       -      +
    107A  ALA*     3.2    12.1    -      -       -      +
    109A  LEU*     1.3    75.7    -      -       -      +
    111A  LEU*     1.3    63.5    +      -       -      +
    113A  TYR*     3.3     6.0    +      -       -      +
    114A  ASN*     2.5    31.2    +      -       -      +
    149A  GLN*     2.4    39.5    +      -       -      +
    152A  VAL*     3.8    15.5    -      -       +      +
    153A  ARG*     3.4    22.0    +      -       -      +
    156A  LEU*     4.3    11.7    -      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with LEU 111 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    107A  ALA      3.3    12.8    +      -       -      +
    108A  ALA*     3.5    12.6    -      -       -      +
    109A  LEU      3.2     0.4    -      -       -      -
    110A  ASP*     1.3    84.4    -      -       -      +
    112A  VAL*     1.3    68.6    +      -       -      +
    114A  ASN*     2.8    34.0    +      -       +      +
    115A  GLY      3.7     1.9    +      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with VAL 112 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     30A  ASP*     5.7     4.7    -      -       -      +
     31A  LEU*     4.6    16.8    -      -       +      -
     34A  THR*     4.9     8.1    -      -       +      -
     92A  TRP*     6.2     3.8    -      -       +      -
     95A  TYR*     3.7    29.2    -      -       +      -
    108A  ALA      3.0    17.4    +      -       -      +
    109A  LEU*     3.6    12.6    -      -       +      +
    110A  ASP      3.4     0.2    -      -       -      -
    111A  LEU*     1.3    76.4    -      -       -      +
    113A  TYR*     1.3    63.0    +      -       +      +
    115A  GLY*     3.3     4.7    +      -       -      -
    116A  VAL*     3.3    28.6    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with TYR 113 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     31A  LEU*     3.6    24.0    -      -       +      +
     35A  LEU*     3.4    12.1    -      -       +      +
     57A  GLN*     2.7    39.7    +      -       -      +
    109A  LEU*     3.2    30.1    +      -       +      +
    110A  ASP*     3.5     9.4    -      -       -      +
    111A  LEU      2.9     1.8    +      -       -      -
    112A  VAL*     1.3    79.7    -      -       +      +
    114A  ASN*     1.3    55.1    +      -       -      +
    116A  VAL*     3.1    10.1    +      -       +      +
    117A  ILE*     2.7    42.2    +      -       +      +
    145A  LEU*     3.8    36.3    -      -       +      -
    148A  PHE*     3.2    32.9    -      +       -      -
    149A  GLN*     4.0    17.7    -      -       +      +
    152A  VAL*     5.2     2.0    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with ASN 114 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    110A  ASP*     2.5    24.1    +      -       -      +
    111A  LEU*     2.8    25.0    +      -       +      +
    113A  TYR*     1.3    70.4    -      -       -      +
    115A  GLY*     1.3    50.8    -      -       -      +
    117A  ILE*     3.2     4.0    +      -       -      +
    118A  GLU*     2.5    51.4    +      -       +      +
    149A  GLN*     2.4    39.7    +      -       -      +
    153A  ARG*     4.1     9.9    +      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with GLY 115 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    111A  LEU      3.7     2.0    +      -       -      -
    112A  VAL      3.3     7.5    +      -       -      -
    113A  TYR      3.3     0.4    -      -       -      -
    114A  ASN*     1.3    75.2    -      -       -      +
    116A  VAL*     1.3    59.8    +      -       -      +
    118A  GLU*     3.9    13.2    +      -       -      -
    119A  ASP*     2.9    43.1    +      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with VAL 116 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     27A  THR*     4.3    27.2    -      -       +      +
     28A  TYR*     5.2     4.0    -      -       +      -
     31A  LEU*     4.3    20.4    -      -       +      -
    112A  VAL*     3.3    27.5    +      -       +      +
    113A  TYR*     3.1    17.0    +      -       +      +
    115A  GLY*     1.3    77.3    -      -       -      +
    117A  ILE*     1.3    56.1    +      -       +      +
    119A  ASP*     3.8     1.7    -      -       -      +
    120A  THR*     2.6    42.5    +      -       -      +
    145A  LEU*     4.2    27.1    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with ILE 117 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    113A  TYR*     2.7    25.2    +      -       +      +
    114A  ASN*     3.6     3.8    -      -       -      +
    116A  VAL*     1.3    70.0    -      -       -      +
    118A  GLU*     1.3    61.1    +      -       -      +
    120A  THR*     3.2     6.5    +      -       -      -
    121A  ARG*     2.8    37.7    +      -       +      +
    142A  ALA*     6.0     0.9    -      -       +      +
    145A  LEU*     4.3    10.8    -      -       +      +
    146A  GLU*     3.3    62.1    -      -       +      +
    149A  GLN*     2.8    34.3    -      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with GLU 118 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    114A  ASN*     2.5    34.9    +      -       +      +
    115A  GLY*     3.5    13.2    +      -       -      +
    116A  VAL      3.3     0.2    -      -       -      -
    117A  ILE*     1.3    74.5    -      -       -      +
    119A  ASP*     1.3    63.2    +      -       -      +
    121A  ARG*     3.2     8.3    +      -       -      +
    122A  LYS*     3.0    45.5    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ASP 119 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     24A  GLN*     4.4     7.0    -      -       -      +
     27A  THR*     5.0    10.5    +      -       +      +
     91A  THR*     4.0    16.1    +      -       -      +
     92A  TRP*     4.6    12.6    -      -       -      -
    115A  GLY*     2.9    24.1    +      -       -      +
    116A  VAL*     3.9     3.6    -      -       -      +
    118A  GLU*     1.3    77.5    -      -       -      +
    120A  THR*     1.3    53.4    +      -       -      +
    122A  LYS*     3.4    21.8    -      -       -      +
    123A  SER*     2.7    40.0    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with THR 120 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     24A  GLN*     2.9    29.9    +      -       -      +
     27A  THR*     5.5     1.4    -      -       -      +
     28A  TYR*     4.9     1.6    -      -       -      +
    116A  VAL*     2.6    32.6    +      -       -      +
    117A  ILE*     3.6     8.1    -      -       -      -
    119A  ASP*     1.3    73.8    -      -       -      +
    121A  ARG*     1.3    64.3    +      -       -      +
    123A  SER*     3.7     1.6    +      -       -      -
    124A  ILE*     3.1    25.6    +      -       +      +
    138A  LEU*     4.0    14.5    -      -       +      +
    142A  ALA*     3.9    31.9    -      -       +      +
    145A  LEU*     4.4     8.8    -      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ARG 121 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    117A  ILE*     2.8    28.3    +      -       +      +
    118A  GLU*     3.3     9.2    -      -       -      +
    120A  THR*     1.3    73.9    -      -       -      +
    122A  LYS*     1.3    65.3    +      -       -      +
    124A  ILE*     2.9    16.0    +      -       -      +
    125A  GLU*     2.9    23.5    +      -       -      +
    142A  ALA*     5.8     0.9    -      -       +      -
    146A  GLU*     3.3    34.0    +      -       -      +
     71B  ARG*     3.8    12.9    -      -       -      +
     75B  LEU*     5.0     5.5    -      -       -      +
    131B  ASP*     3.8    17.1    +      -       -      +
    132B  LEU*     4.4     8.1    -      -       -      +
    133B  VAL*     3.3    25.0    -      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with LYS 122 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    118A  GLU*     3.0    32.2    +      -       -      +
    119A  ASP*     3.3    30.5    +      -       -      +
    121A  ARG*     1.3    75.1    -      -       -      +
    123A  SER*     1.3    59.3    +      -       -      +
    124A  ILE      3.1     0.2    +      -       -      -
    125A  GLU*     3.2    17.3    +      -       -      +
    126A  LYS*     2.8    48.3    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with SER 123 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     20A  LEU*     3.3    34.4    +      -       -      +
     23A  LYS*     5.4     2.6    +      -       -      +
     24A  GLN*     3.3    23.7    +      -       -      -
    119A  ASP*     2.7    22.2    +      -       -      +
    120A  THR      4.0     1.1    -      -       -      -
    122A  LYS*     1.3    73.2    -      -       -      +
    124A  ILE*     1.3    60.7    +      -       -      +
    126A  LYS*     3.7     1.9    +      -       -      +
    127A  LEU*     3.1    32.6    +      -       -      +
    138A  LEU*     3.8    13.7    -      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with ILE 124 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    120A  THR      3.1    19.3    +      -       -      +
    121A  ARG*     2.9    17.7    +      -       -      +
    123A  SER*     1.3    74.1    -      -       -      +
    125A  GLU*     1.3    58.5    +      -       +      +
    127A  LEU*     2.8    24.0    +      -       -      +
    135A  GLN*     2.6    44.8    +      -       +      +
    138A  LEU*     3.9    22.4    -      -       +      +
    139A  ILE*     3.6    33.7    -      -       +      +
    142A  ALA*     4.3    11.7    -      -       +      -
    132B  LEU*     3.8    22.2    -      -       +      -
    133B  VAL*     5.1     4.9    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with GLU 125 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    121A  ARG      2.9    11.4    +      -       -      +
    122A  LYS*     3.7    17.8    -      -       -      +
    124A  ILE*     1.3    77.4    -      -       +      +
    126A  LYS*     1.3    64.2    +      -       +      +
    128A  GLU*     3.0    29.9    +      -       -      +
    135A  GLN*     4.5     2.5    -      -       -      +
    132B  LEU*     6.3     0.2    -      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with LYS 126 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     20A  LEU*     4.0    26.2    -      -       +      +
     23A  LYS*     5.1    10.9    -      -       -      +
    122A  LYS*     2.8    35.0    +      -       +      +
    123A  SER*     3.8     5.8    -      -       -      +
    125A  GLU*     1.3    83.3    -      -       +      +
    127A  LEU*     1.3    59.0    +      -       -      +
    128A  GLU*     3.3     0.8    +      -       -      -
    129A  ASP      4.8     1.0    +      -       -      -
    130A  LEU*     3.2    25.3    -      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with LEU 127 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     17A  VAL*     3.8    28.0    -      -       +      -
     20A  LEU*     3.8    22.4    -      -       +      -
     21A  LEU*     4.8     4.3    -      -       +      -
    123A  SER*     3.1    20.2    +      -       -      +
    124A  ILE*     2.8    12.3    +      -       -      +
    126A  LYS*     1.3    78.3    -      -       -      +
    128A  GLU*     1.3    67.8    +      -       -      +
    129A  ASP      3.5     0.9    -      -       -      -
    130A  LEU*     3.0    24.1    +      -       +      -
    131A  ASP      3.0    17.7    +      -       -      +
    134A  SER*     3.8    15.3    -      -       -      +
    135A  GLN*     3.7    35.2    -      -       +      +
    138A  LEU*     4.3    15.7    -      -       +      -
----------------------------------------------------------
 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