Contacts of the helix formed by residues 111 - 134 (chain D) in PDB entry 6N1G


Residue contacts within the protein are derived with the CSU software (Sobolev V., Sorokine A., Prilusky J., Abola E.E. and Edelman M. (1999) Automated analysis of interatomic contacts in proteins. Bioinformatics, 15, 327-332). A short description of the analytical approach is given at the end of the page.
For CSU analysis of other PDB entry

Note:
Non-standard 3 letter residue codes indicate a heterogroup. To identify and analyse, use LPC software

Legend:
Dist - nearest distance (Å) between atoms of two residues
Surf - contact surface area (Å2) between two residues
HB   - hydrophilic-hydrophilic contact (hydrogen bond)
Arom - aromatic-aromatic contact
Phob - hydrophobic-hydrophobic contact
DC   - hydrophobic-hydrophilic contact (destabilizing contact)
+/-  - indicates presence/absence of a specific contacts
*    - indicates residues forming contacts  by their side chain
       (including CA atoms)
Residues in contact with LYS 111 (chain D).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     32D  LYS      5.4     3.6    +      -       -      -
     33D  MET*     3.6    30.4    -      -       -      +
     36D  GLU*     5.7     1.0    -      -       -      +
    107D  VAL*     5.2     0.9    -      -       +      -
    108D  PRO*     3.0    37.0    +      -       +      +
    110D  ARG*     1.3    82.3    -      -       +      +
    112D  PHE*     1.3    58.0    +      -       -      +
    113D  PRO      3.5     1.3    -      -       -      -
    114D  VAL*     3.1     6.0    -      -       +      +
    115D  TYR*     2.7    73.3    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with PHE 112 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     95D  ALA*     3.6    12.3    -      -       +      -
     98D  THR*     3.4    24.9    -      -       +      -
     99D  PHE*     3.3    59.2    -      +       +      -
    102D  CYS*     3.9    17.7    -      -       +      -
    108D  PRO      3.5     3.6    +      -       -      +
    109D  TRP*     4.0     8.7    -      -       -      +
    111D  LYS*     1.3    78.3    -      -       -      +
    113D  PRO*     1.4    74.9    -      -       +      +
    115D  TYR*     3.4     6.7    +      -       -      +
    116D  VAL*     3.2    32.2    +      -       +      +
    262D  LEU*     5.2     5.8    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with PRO 113 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    109D  TRP      3.4    13.9    -      -       -      +
    110D  ARG*     4.0     9.0    -      -       -      +
    111D  LYS      3.7     1.1    -      -       -      -
    112D  PHE*     1.4    99.3    -      -       +      +
    114D  VAL*     1.3    66.8    +      -       -      +
    116D  VAL*     3.0    28.1    +      -       +      +
    117D  LEU*     3.2     7.6    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with VAL 114 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     33D  MET*     3.4    34.5    -      -       +      -
     37D  PHE*     2.7    55.1    -      -       +      -
    110D  ARG      4.0     5.8    -      -       -      +
    111D  LYS*     3.1    28.7    -      -       +      +
    113D  PRO*     1.3    80.4    -      -       +      +
    115D  TYR*     1.3    56.4    +      -       -      +
    117D  LEU*     3.7     3.3    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with TYR 115 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     33D  MET*     3.1    27.1    -      -       +      -
     36D  GLU*     2.7    55.2    -      -       +      +
     37D  PHE*     4.9     0.9    -      -       -      -
     40D  GLU*     4.0     8.8    -      -       -      +
     89D  SER      4.8     3.3    +      -       -      -
     92D  HIS*     3.7    32.1    -      +       -      -
     98D  THR*     4.0    12.6    -      -       +      +
    107D  VAL*     5.1     5.2    -      -       +      -
    108D  PRO*     5.0     0.7    -      -       -      +
    111D  LYS*     2.7    61.5    +      -       +      +
    112D  PHE*     3.6     6.7    -      -       -      +
    113D  PRO      3.1     0.2    -      -       -      -
    114D  VAL*     1.3    78.2    -      -       -      +
    116D  VAL*     1.3    59.4    +      -       -      +
    118D  GLY*     3.5     3.5    +      -       -      -
    119D  GLN*     3.1    27.9    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with VAL 116 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     95D  ALA*     3.5    33.0    -      -       +      -
     98D  THR*     5.9     1.3    -      -       -      +
    112D  PHE*     3.2    25.4    +      -       +      +
    113D  PRO*     3.0    24.7    +      -       +      +
    115D  TYR*     1.3    76.3    -      -       -      +
    117D  LEU*     1.3    58.9    +      -       +      +
    119D  GLN*     3.4    10.8    +      -       +      +
    120D  PHE*     3.1    29.7    +      -       +      +
    228D  SER*     5.7     1.8    -      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with LEU 117 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     37D  PHE*     3.5    19.2    -      -       +      -
    113D  PRO      3.2    13.1    +      -       -      +
    114D  VAL*     3.7     2.2    +      -       -      +
    115D  TYR      3.3     0.2    -      -       -      -
    116D  VAL*     1.3    79.6    -      -       +      +
    118D  GLY*     1.3    56.8    +      -       -      +
    120D  PHE*     4.1    13.9    -      -       +      -
    121D  LEU*     3.3    31.0    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with GLY 118 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     37D  PHE*     3.0    38.4    -      -       -      -
     40D  GLU*     4.3     1.3    -      -       -      -
     41D  PHE*     3.1    25.9    -      -       -      -
    115D  TYR      3.5     3.8    +      -       -      -
    116D  VAL      3.3     0.4    -      -       -      -
    117D  LEU*     1.3    75.0    -      -       -      +
    119D  GLN*     1.3    60.9    +      -       -      +
    120D  PHE      3.5     0.2    -      -       -      -
    121D  LEU*     4.7     1.1    -      -       -      -
    122D  GLY*     3.0    20.5    +      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with GLN 119 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     40D  GLU*     2.5    29.6    +      -       +      +
     44D  THR*     3.7    23.7    -      -       +      +
     93D  MET      3.3     3.6    -      -       -      +
     94D  ASN      3.2    24.7    -      -       -      +
     95D  ALA*     3.3    27.0    +      -       -      +
     98D  THR*     3.6    15.8    +      -       -      -
    115D  TYR      3.1    17.7    +      -       -      +
    116D  VAL*     3.4    15.0    +      -       -      +
    118D  GLY*     1.3    75.4    -      -       -      +
    120D  PHE*     1.3    60.8    +      -       -      +
    122D  GLY      3.6     0.2    +      -       -      -
    123D  SER*     3.1    21.8    +      -       -      -
    228D  SER*     2.7    24.5    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with PHE 120 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    116D  VAL*     3.1    18.4    +      -       +      +
    117D  LEU*     4.4    13.9    -      -       +      +
    119D  GLN*     1.3    73.2    -      -       -      +
    121D  LEU*     1.3    67.5    +      -       +      +
    123D  SER      3.1     1.6    +      -       -      -
    124D  PHE*     2.9    26.6    +      -       +      -
    228D  SER*     3.1    14.4    +      -       -      +
    231D  LEU*     3.3    36.8    -      -       +      -
    232D  PRO*     3.1    28.6    -      -       +      +
    235D  ILE*     3.4    43.3    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with LEU 121 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     37D  PHE*     4.9    11.9    -      -       +      -
     41D  PHE*     3.4    26.8    -      -       +      -
    117D  LEU*     3.3    24.0    +      -       +      +
    120D  PHE*     1.3    84.8    -      -       +      +
    122D  GLY*     1.3    57.6    +      -       -      +
    124D  PHE*     4.0    16.6    -      -       +      +
    125D  LEU*     3.1    24.9    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with GLY 122 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     41D  PHE*     3.4    38.3    -      -       -      -
     45D  TYR*     2.9    33.1    -      -       -      -
    118D  GLY      3.0    14.5    +      -       -      -
    119D  GLN      4.0     1.8    -      -       -      -
    120D  PHE      3.2     0.2    -      -       -      -
    121D  LEU*     1.3    75.9    -      -       -      +
    123D  SER*     1.3    56.9    +      -       -      +
    126D  ALA*     3.2     6.7    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with SER 123 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     44D  THR*     2.9    32.8    +      -       -      +
     48D  MET*     4.6     5.8    -      -       -      -
    119D  GLN      3.1     6.0    +      -       -      -
    120D  PHE      3.1     1.6    +      -       -      -
    122D  GLY*     1.3    75.6    -      -       -      +
    124D  PHE*     1.3    63.7    +      -       -      +
    125D  LEU      3.3     0.9    -      -       -      -
    126D  ALA*     3.4     9.0    -      -       -      +
    127D  ALA*     3.0    23.7    +      -       -      +
    228D  SER      3.0    25.4    +      -       -      -
    229D  ARG*     4.5     1.7    -      -       -      -
    232D  PRO*     3.6     9.2    -      -       -      -
    233D  PRO*     4.1    12.0    -      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with PHE 124 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    120D  PHE*     2.9    16.7    +      -       +      +
    121D  LEU*     4.0    20.6    -      -       +      +
    123D  SER*     1.3    76.6    -      -       -      +
    125D  LEU*     1.3    71.2    +      -       +      +
    127D  ALA*     3.6     4.0    +      -       -      +
    128D  ALA*     3.4    20.8    +      -       +      +
    232D  PRO*     3.4    14.0    -      -       +      +
    235D  ILE*     3.3    40.2    -      -       +      -
    236D  PHE*     3.6    38.3    -      +       +      +
    239D  ILE*     4.7    12.3    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with LEU 125 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     41D  PHE*     3.3    30.7    -      -       +      -
     45D  TYR*     2.5    38.2    +      -       +      +
    121D  LEU*     3.1    18.0    +      -       +      +
    124D  PHE*     1.3    84.7    -      -       +      +
    126D  ALA*     1.3    59.1    +      -       -      +
    128D  ALA*     3.3    12.0    +      -       +      +
    129D  THR*     3.1    13.4    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ALA 126 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     45D  TYR*     3.0    32.7    -      -       +      +
     48D  MET*     3.3    30.7    -      -       +      -
     49D  VAL*     4.3     5.0    -      -       -      +
    122D  GLY      3.2    17.9    +      -       -      +
    123D  SER*     3.2     5.3    +      -       -      +
    125D  LEU*     1.3    76.5    -      -       -      +
    127D  ALA*     1.3    63.5    +      -       -      +
    128D  ALA      3.2     0.5    +      -       -      -
    129D  THR*     3.2     5.0    +      -       -      -
    130D  ILE*     3.2    21.7    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ALA 127 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     48D  MET*     4.5     1.0    -      -       -      +
     52D  LEU*     3.7    18.2    -      -       +      -
    123D  SER      3.0    14.5    +      -       -      +
    124D  PHE      4.0     4.0    -      -       -      +
    125D  LEU      3.4     0.2    -      -       -      -
    126D  ALA*     1.3    76.7    -      -       -      +
    128D  ALA*     1.3    57.0    +      -       -      +
    130D  ILE*     3.0    12.0    -      -       -      +
    131D  TYR*     2.9    31.0    +      -       -      +
    158D  PHE*     3.8    13.1    -      -       +      -
    233D  PRO*     4.1    15.7    -      -       +      -
    236D  PHE*     3.7    14.8    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with ALA 128 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    124D  PHE*     3.4    12.9    +      -       +      +
    125D  LEU*     3.3    20.2    +      -       +      +
    126D  ALA      3.1     1.0    -      -       -      -
    127D  ALA*     1.3    79.4    -      -       -      +
    129D  THR*     1.3    54.5    +      -       -      +
    131D  TYR*     3.4     1.9    +      -       -      +
    132D  SER*     2.7    38.4    +      -       -      +
    236D  PHE*     3.7    28.2    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with THR 129 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    173B  LEU*     4.9     7.4    -      -       +      -
    177B  TRP*     3.8    37.4    -      -       +      +
     45D  TYR*     1.9    35.0    +      -       -      +
     49D  VAL*     5.8     1.6    -      -       +      -
    125D  LEU*     3.1     4.2    +      -       -      +
    126D  ALA      3.2     4.4    +      -       -      -
    128D  ALA*     1.3    75.9    -      -       -      +
    130D  ILE*     1.3    58.9    +      -       -      +
    132D  SER*     3.8     5.4    -      -       -      -
    133D  LEU*     3.0    46.2    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ILE 130 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    216B  SER      4.5     1.3    -      -       -      +
    217B  LEU*     4.6    10.3    -      -       +      -
     49D  VAL*     4.4    15.2    -      -       +      +
     52D  LEU*     3.2    38.6    -      -       +      +
     53D  GLY*     3.4    31.2    -      -       -      +
     56D  ALA*     4.5     4.9    -      -       +      -
    126D  ALA      3.2    11.4    +      -       -      +
    127D  ALA      3.0    15.9    -      -       -      +
    129D  THR*     1.3    75.5    -      -       -      +
    131D  TYR*     1.3    59.2    +      -       -      +
    133D  LEU*     4.5     2.5    -      -       +      +
    134D  PHE*     3.1    62.1    +      -       +      +
    158D  PHE*     4.5     3.1    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with TYR 131 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    127D  ALA      2.9    18.9    +      -       -      +
    128D  ALA      4.9     0.9    -      -       -      -
    130D  ILE*     1.3    76.0    -      -       -      +
    132D  SER*     1.3    63.2    +      -       -      +
    133D  LEU      3.3     0.2    -      -       -      -
    134D  PHE*     3.9     2.5    -      -       -      +
    135D  TYR*     3.0    62.6    +      +       -      +
    138D  ILE*     3.4    45.0    -      -       +      +
    158D  PHE*     4.1    17.9    -      +       +      -
    236D  PHE*     3.5    28.9    -      +       +      -
    240D  ALA*     4.3    20.0    +      -       +      -
    242D  TRP*     4.4    10.8    -      +       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with SER 132 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    170B  ARG*     3.7    19.1    +      -       -      -
    173B  LEU*     5.4    14.0    -      -       -      +
    128D  ALA*     2.7    24.6    +      -       -      +
    129D  THR*     3.8     8.9    -      -       -      -
    130D  ILE      3.4     0.2    -      -       -      -
    131D  TYR*     1.3    81.5    -      -       -      +
    133D  LEU*     1.3    64.7    +      -       -      +
    135D  TYR*     3.8     7.3    -      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with LEU 133 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    166B  MET*     4.0     9.7    -      -       -      +
    170B  ARG*     3.7    13.8    +      -       -      +
    173B  LEU*     2.8    37.2    -      -       +      -
    174B  ASN*     3.8    30.4    -      -       +      +
    177B  TRP*     4.1    13.9    -      -       +      -
    217B  LEU*     3.8    25.1    -      -       +      -
    220B  ASN*     3.5    13.9    -      -       -      +
     49D  VAL*     5.8     1.3    -      -       +      -
    129D  THR*     3.0    36.4    +      -       +      +
    130D  ILE*     4.1     2.5    -      -       -      +
    132D  SER*     1.3    78.1    -      -       -      +
    134D  PHE*     1.3    69.6    +      -       +      +
    135D  TYR      3.4     2.5    -      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with PHE 134 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    166B  MET*     5.9     0.2    -      -       -      -
    170B  ARG*     4.1     0.7    -      -       -      -
    216B  SER      3.5    19.3    -      -       -      -
    217B  LEU*     4.6     2.5    -      -       +      -
    220B  ASN*     3.1    32.8    -      -       -      -
     53D  GLY      3.9     2.0    -      -       -      -
     56D  ALA*     3.6    16.4    -      -       +      -
     57D  HIS*     3.5    27.4    -      +       +      -
     60D  LEU*     5.0     2.0    -      -       +      -
     61D  ASN*     3.5    25.8    -      -       -      -
    130D  ILE*     3.1    43.1    +      -       +      +
    131D  TYR*     3.8     2.7    -      -       -      +
    133D  LEU*     1.3    84.9    -      -       +      +
    135D  TYR*     1.3    65.0    +      -       -      +
    136D  THR      3.2     2.7    -      -       -      -
    137D  ALA*     2.8    24.1    +      -       +      +
    138D  ILE*     3.3    17.4    +      -       +      +
----------------------------------------------------------
 Back to top of page


A short description of the analytical approach
The contact analysis used in this page is based upon the approach developed in: Sobolev V., Wade R.C., Vriend G. and Edelman M. PROTEINS (1996) 25, 120-129. Contact legitimacy depends on the hydrophobic-hydrophilic properties of the contacting atoms. In order to define it, for each inter-atomic contact, eight atom classes have been introduced:


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

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

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