Contacts of the helix formed by residues 46 - 71 (chain A) in PDB entry 6JOD


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 ALA 46 (chain A).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     43A  HIS*     2.9    10.2    +      -       -      +
     45A  ASP*     1.3    78.2    -      -       +      +
     47A  ILE*     1.3    65.2    +      -       +      +
     48A  PRO*     3.5     0.4    -      -       -      -
     49A  ILE*     3.5     7.7    +      -       -      +
     50A  LEU*     3.2    36.4    +      -       +      +
    302A  PHE*     5.6     5.2    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with ILE 47 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     43A  HIS*     3.5    22.0    +      -       +      +
     44A  LEU*     3.7    30.3    -      -       +      +
     46A  ALA*     1.3    77.0    -      -       -      +
     48A  PRO*     1.3    70.5    -      -       +      +
     50A  LEU*     3.3     8.1    +      -       -      +
     51A  TYR*     3.0    47.4    +      -       +      -
    104A  TYR*     3.6    29.4    -      -       +      -
    301A  PRO*     3.5    26.7    -      -       +      -
    302A  PHE*     4.1    20.9    -      -       +      +
    305A  LEU*     6.2     0.2    -      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with PRO 48 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     44A  LEU      3.2    18.2    -      -       -      +
     45A  ASP      3.8     9.6    -      -       -      +
     46A  ALA      3.6     1.6    -      -       -      -
     47A  ILE*     1.3    94.1    -      -       +      +
     49A  ILE*     1.3    68.3    +      -       +      +
     51A  TYR*     3.1     4.4    +      -       +      +
     52A  TYR*     2.9    23.9    +      -       +      -
    101A  ALA*     3.2    27.6    -      -       +      +
    104A  TYR*     4.5     5.2    -      -       +      +
    105A  SER*     3.1    33.2    -      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ILE 49 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     45A  ASP      4.7    10.8    -      -       -      +
     46A  ALA*     3.5     9.3    +      -       -      +
     47A  ILE      3.3     0.4    -      -       -      -
     48A  PRO*     1.3    82.1    -      -       +      +
     50A  LEU*     1.3    67.3    +      -       +      +
     52A  TYR*     3.0    11.6    +      -       +      +
     53A  ILE*     2.9    39.0    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with LEU 50 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     46A  ALA*     3.2    24.4    +      -       +      +
     47A  ILE*     3.3     7.6    +      -       -      +
     49A  ILE*     1.3    79.7    -      -       +      +
     51A  TYR*     1.3    63.5    +      -       -      +
     53A  ILE*     3.1    22.8    +      -       +      +
     54A  ILE*     3.0    28.4    +      -       +      +
    302A  PHE*     4.6    21.5    -      -       +      -
    305A  LEU*     3.6    26.2    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with TYR 51 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     47A  ILE*     3.0    40.2    +      -       +      +
     48A  PRO      3.3     9.0    -      -       -      +
     50A  LEU*     1.3    74.8    -      -       -      +
     52A  TYR*     1.3    58.1    +      -       -      +
     54A  ILE*     3.5     2.3    +      -       -      +
     55A  PHE*     2.9    28.6    +      -       -      +
     97A  LEU*     3.9    31.6    -      -       +      +
    100A  TRP*     3.5    34.8    -      +       +      -
    101A  ALA*     3.6    16.8    -      -       +      -
    104A  TYR*     3.8    20.9    +      +       -      -
    301A  PRO      3.5    16.7    +      -       -      -
    304A  ILE*     4.1    16.3    -      -       -      +
    305A  LEU*     3.5    37.0    -      -       +      -
    308A  PHE*     4.8     4.0    -      +       -      -
      7B  PRO*     4.6     1.5    -      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with TYR 52 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     48A  PRO*     2.9    12.4    +      -       +      +
     49A  ILE*     3.0    15.2    +      -       +      +
     51A  TYR*     1.3    73.8    -      -       -      +
     53A  ILE*     1.3    61.4    +      -       -      +
     55A  PHE*     3.2    21.4    +      +       +      +
     56A  VAL*     2.9    31.6    +      -       -      +
     98A  PRO*     4.1    29.9    +      -       +      +
    101A  ALA*     3.4    32.5    -      -       +      -
    102A  THR*     4.6     7.7    +      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with ILE 53 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     49A  ILE*     2.9    36.1    +      -       +      +
     50A  LEU*     3.4    23.1    -      -       +      +
     52A  TYR*     1.3    76.7    -      -       +      +
     54A  ILE*     1.3    71.7    +      -       +      +
     56A  VAL*     3.1    12.9    -      -       +      +
     57A  ILE*     3.0    43.2    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ILE 54 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     50A  LEU*     3.0    17.0    +      -       +      +
     51A  TYR      3.8     3.6    -      -       -      +
     53A  ILE*     1.3    85.1    -      -       +      +
     55A  PHE*     1.3    57.2    +      -       -      +
     57A  ILE*     3.9     9.9    -      -       +      +
     58A  GLY*     2.9    28.4    +      -       -      -
     94A  LEU*     4.5     2.1    -      -       +      +
     97A  LEU*     3.8    15.9    -      -       +      -
    305A  LEU*     3.6    19.7    -      -       +      -
    308A  PHE      4.2    14.4    -      -       -      +
    309A  THR*     3.5    38.4    -      -       +      +
    312A  CYS*     4.2    11.4    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with PHE 55 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     51A  TYR      2.9    19.4    +      -       -      +
     52A  TYR*     3.4    23.3    -      +       -      +
     53A  ILE      3.1     0.2    -      -       -      -
     54A  ILE*     1.3    76.4    -      -       -      +
     56A  VAL*     1.3    70.4    +      -       +      +
     59A  PHE*     2.9    69.8    +      +       +      +
     94A  LEU*     3.1    27.5    -      -       -      +
     95A  ALA*     4.3     5.2    -      -       -      -
     97A  LEU*     3.7    17.9    -      -       +      +
     98A  PRO*     3.5    29.4    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with VAL 56 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     52A  TYR      2.9    18.0    +      -       -      +
     53A  ILE*     3.1    16.4    -      -       +      +
     55A  PHE*     1.3    85.7    -      -       +      +
     57A  ILE*     1.3    72.4    +      -       +      +
     59A  PHE*     3.8     2.4    -      -       +      -
     60A  LEU*     3.0    48.2    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ILE 57 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     53A  ILE*     3.0    35.1    +      -       +      +
     54A  ILE*     3.9     9.2    -      -       +      +
     56A  VAL*     1.3    84.2    -      -       +      +
     58A  GLY*     1.3    63.8    +      -       -      +
     60A  LEU*     3.1     5.3    +      -       -      +
     61A  VAL*     3.0    37.7    +      -       +      +
    312A  CYS*     3.6    16.8    -      -       -      -
    316A  PHE*     5.6     4.5    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with GLY 58 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     54A  ILE      2.9    10.5    +      -       -      -
     57A  ILE*     1.3    77.1    -      -       -      +
     59A  PHE*     1.3    57.1    +      -       -      +
     61A  VAL*     4.4     2.5    -      -       -      -
     62A  ASN*     2.9    42.6    +      -       -      +
     94A  LEU*     3.5    19.1    -      -       -      -
    312A  CYS*     3.4    20.0    -      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with PHE 59 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     55A  PHE*     2.9    52.1    +      +       +      +
     56A  VAL*     4.0     3.4    -      -       -      +
     58A  GLY*     1.3    76.7    -      -       -      +
     60A  LEU*     1.3    62.7    +      -       +      +
     63A  ILE*     3.1    54.4    -      -       +      +
     91A  LEU*     3.7    31.4    -      -       +      -
     94A  LEU*     4.3     4.5    -      -       +      +
     95A  ALA*     4.1    24.2    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with LEU 60 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     56A  VAL*     3.0    36.1    +      -       +      +
     57A  ILE*     3.6     5.2    -      -       -      +
     59A  PHE*     1.3    83.5    -      -       +      +
     61A  VAL*     1.3    68.4    +      -       +      +
     63A  ILE*     3.1    11.4    +      -       +      +
     64A  VAL*     2.9    29.4    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with VAL 61 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     57A  ILE*     3.0    25.6    +      -       +      +
     58A  GLY*     4.2     4.5    -      -       -      +
     60A  LEU*     1.3    75.6    -      -       +      +
     62A  ASN*     1.3    63.7    +      -       -      +
     64A  VAL*     2.9    20.6    +      -       -      +
     65A  VAL*     3.0    12.5    +      -       -      +
    312A  CYS      4.7     6.1    -      -       -      +
    315A  PRO*     3.5    23.3    -      -       +      -
    316A  PHE*     3.8    29.6    -      -       +      -
    320A  PHE*     3.5    27.8    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with ASN 62 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     58A  GLY*     2.9    38.5    +      -       -      +
     61A  VAL*     1.3    74.4    -      -       -      +
     63A  ILE*     1.3    62.3    +      -       -      +
     65A  VAL*     3.2     4.9    +      -       -      +
     66A  VAL*     2.9    30.5    +      -       -      +
     87A  ALA*     3.4    19.3    -      -       -      +
     90A  ASP*     3.3    22.5    -      -       -      +
     91A  LEU*     3.9    16.4    -      -       +      -
     94A  LEU*     3.9     7.7    -      -       -      +
    311A  SER      3.8    12.7    +      -       -      -
    312A  CYS*     4.2     1.6    +      -       -      +
    315A  PRO*     3.2    30.4    -      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ILE 63 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     59A  PHE*     3.1    49.5    +      -       +      +
     60A  LEU*     3.1    12.4    +      -       +      +
     62A  ASN*     1.3    76.9    -      -       -      +
     64A  VAL*     1.3    69.1    +      -       +      +
     66A  VAL*     3.8     4.3    -      -       -      +
     67A  THR*     2.9    42.2    +      -       +      +
     91A  LEU*     3.7    20.4    -      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with VAL 64 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     60A  LEU*     2.9    22.9    +      -       +      +
     61A  VAL*     2.9    10.6    +      -       -      +
     63A  ILE*     1.3    79.3    -      -       +      +
     65A  VAL*     1.3    61.1    +      -       -      +
     67A  THR*     2.5    22.9    +      -       -      +
     68A  LEU*     3.0    24.5    +      -       +      +
    320A  PHE*     4.0    21.5    -      -       +      -
    325A  PHE*     5.0     4.5    -      -       +      -
    329A  LEU*     5.2    11.0    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with VAL 65 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     61A  VAL      3.0    12.2    +      -       -      +
     62A  ASN*     3.2     6.0    +      -       -      +
     64A  VAL*     1.3    75.5    -      -       -      +
     66A  VAL*     1.3    64.2    +      -       -      +
     68A  LEU*     3.1     8.2    +      -       -      +
     69A  PHE*     3.0    23.7    +      -       +      +
     83A  ILE*     4.2    11.9    -      -       +      +
     84A  PHE*     5.5     2.2    -      -       -      -
     87A  ALA*     3.7    22.7    -      -       +      -
    315A  PRO*     3.6    27.1    -      -       +      -
    319A  CYS*     3.7    30.6    -      -       +      -
    320A  PHE*     3.6    20.0    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with VAL 66 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     62A  ASN      2.9    22.3    +      -       -      +
     63A  ILE*     4.0     4.9    -      -       -      +
     65A  VAL*     1.3    76.2    -      -       -      +
     67A  THR*     1.3    58.9    +      -       +      +
     69A  PHE*     3.9     5.2    -      -       -      +
     70A  CYS*     2.8    40.5    +      -       +      +
     84A  PHE*     3.8    21.1    -      -       +      +
     87A  ALA*     3.7    34.3    -      -       +      +
     88A  VAL*     4.2    12.8    -      -       +      +
     91A  LEU*     4.4    16.2    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with THR 67 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     63A  ILE*     2.9    30.3    +      -       +      +
     64A  VAL*     2.5    27.5    +      -       -      +
     66A  VAL*     1.3    73.9    -      -       +      +
     68A  LEU*     1.3    66.6    +      -       -      +
     69A  PHE      3.0     2.3    +      -       -      -
     70A  CYS*     3.3    10.9    +      -       -      +
     71A  CYS      4.0     2.1    +      -       -      -
     72A  GLN*     3.2    23.2    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with LEU 68 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     64A  VAL*     3.0    21.7    +      -       +      +
     65A  VAL*     3.5     7.4    -      -       -      +
     67A  THR*     1.3    84.4    +      -       -      +
     69A  PHE*     1.3    57.3    +      -       -      +
     72A  GLN*     3.1    30.5    -      -       +      +
     73A  LYS      4.0     5.7    -      -       -      +
     74A  GLY*     5.1     1.4    -      -       -      -
    319A  CYS*     4.7    14.1    -      -       -      -
    320A  PHE*     5.1     0.2    -      -       +      -
    325A  PHE*     3.9    33.4    -      -       +      +
    328A  LYS*     4.9    30.6    +      -       +      +
    329A  LEU*     5.7     3.6    -      -       +      +
    332A  VAL*     3.9    28.5    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with PHE 69 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     65A  VAL*     3.0    17.1    +      -       +      +
     66A  VAL*     3.9     0.9    -      -       -      +
     67A  THR      3.0     0.4    -      -       -      -
     68A  LEU*     1.3    79.5    -      -       -      +
     70A  CYS*     1.3    65.3    +      -       -      +
     71A  CYS      3.8     0.2    -      -       -      -
     72A  GLN      3.5     4.0    -      -       -      +
     74A  GLY      4.0    11.2    -      -       -      -
     75A  PRO*     3.3    42.6    -      -       +      +
     80A  SER*     3.0    54.3    -      -       -      -
     81A  ILE*     3.6    12.8    -      -       +      -
     83A  ILE*     5.6     4.7    -      -       +      -
     84A  PHE*     3.4    45.3    -      +       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with CYS 70 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     66A  VAL*     2.8    23.4    +      -       +      +
     67A  THR*     3.3     5.8    +      -       -      +
     69A  PHE*     1.3    81.0    -      -       -      +
     71A  CYS*     1.3    66.3    +      -       -      +
     72A  GLN      4.7     0.2    -      -       -      +
     75A  PRO*     4.9     4.5    -      -       -      +
     84A  PHE*     4.4    18.2    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with CYS 71 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     67A  THR      4.0     2.4    +      -       -      -
     70A  CYS*     1.3    83.6    -      -       -      +
     72A  GLN*     1.3    80.4    +      -       -      +
     73A  LYS*     3.5    12.5    +      -       -      +
----------------------------------------------------------
 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