Contacts of the helix formed by residues 70 - 91 (chain t) in PDB entry 3J9X


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 GLY 70 (chain t).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     827    T      3.5    26.8    +      -       -      +
     837    A      4.4     2.0    +      -       -      -
    111q  PHE*     3.5    18.3    -      -       -      -
     90r  ILE*     5.6     0.6    -      -       -      +
     99r  MET*     5.3     0.4    -      -       -      +
     69t  THR*     1.3    76.1    -      -       -      +
     71t  PRO*     1.3    66.2    -      -       -      +
     72t  ASN      3.0     0.2    -      -       -      -
     73t  ARG*     2.9    34.9    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with PRO 71 (chain t). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     827    T      3.6    24.0    -      -       +      +
     837    A      3.9    32.8    -      -       -      +
     71q  PRO*     3.6    18.9    -      -       +      +
     74q  ALA*     4.8     2.0    -      -       +      -
     75q  ILE*     3.5    38.4    -      -       +      +
    107q  TYR*     6.5     0.9    -      -       +      -
    111q  PHE*     4.6     7.4    -      -       +      -
     70t  GLY*     1.3    82.3    -      -       -      +
     72t  ASN*     1.3    65.1    +      -       -      +
     73t  ARG      3.1     0.4    -      -       -      -
     74t  ALA*     3.1     4.8    +      -       -      +
     75t  ILE*     3.0    23.6    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ASN 72 (chain t). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     72q  ASN*     3.1    24.4    -      -       -      +
     75q  ILE*     3.5    11.8    -      -       -      +
    111q  PHE*     3.3    25.5    +      -       -      +
    112q  ASN*     4.8     8.1    +      -       -      +
     68t  ILE*     3.5    16.2    -      -       +      -
     69t  THR*     3.3    14.2    +      -       -      +
     70t  GLY      3.0     0.6    -      -       -      -
     71t  PRO*     1.3    74.5    -      -       -      +
     73t  ARG*     1.3    64.5    +      -       -      +
     75t  ILE*     3.3    18.9    +      -       +      +
     76t  TYR*     3.0    26.2    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with ARG 73 (chain t). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     827    T      3.0    36.0    +      -       -      +
     89r  ARG      4.6     0.8    +      -       -      -
     90r  ILE*     3.7    27.2    +      -       -      +
     60t  SER*     2.7    46.5    +      -       -      +
     63t  LEU*     3.5    15.9    -      -       +      +
     64t  THR*     2.9    32.1    +      -       -      +
     68t  ILE*     2.8    55.6    +      -       +      +
     69t  THR*     3.8     8.3    -      -       -      +
     70t  GLY      2.9    15.6    +      -       -      +
     72t  ASN*     1.3    76.2    -      -       -      +
     74t  ALA*     1.3    59.6    +      -       -      +
     76t  TYR*     3.0     4.9    +      -       -      -
     77t  GLN*     2.8    31.1    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ALA 74 (chain t). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     817    A      4.1    15.8    -      -       +      +
     827    T      3.0    41.8    +      -       +      +
    2678    A      4.7     5.4    -      -       +      -
    2688    T      4.4     5.4    -      -       -      +
     71q  PRO*     4.8     3.4    -      -       +      -
     70t  GLY      3.6     0.8    +      -       -      -
     71t  PRO*     3.1     9.7    +      -       +      +
     73t  ARG*     1.3    77.6    -      -       -      +
     75t  ILE*     1.3    64.1    +      -       -      +
     77t  GLN*     3.6    10.3    -      -       -      +
     78t  GLY*     2.9    22.0    +      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with ILE 75 (chain t). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    2688    T      5.8     0.2    -      -       -      -
     71q  PRO*     3.6    26.4    -      -       +      +
     72q  ASN*     3.5    36.6    -      -       -      +
     71t  PRO      3.0    14.4    +      -       -      +
     72t  ASN*     3.4    22.4    -      -       +      +
     73t  ARG      3.2     0.4    -      -       -      -
     74t  ALA*     1.3    77.2    -      -       -      +
     76t  TYR*     1.3    66.1    +      -       +      +
     78t  GLY*     3.4     1.1    +      -       -      -
     79t  PHE*     3.1    21.3    +      -       -      +
    107t  TYR*     3.5    30.5    -      -       +      -
    111t  PHE*     4.6    11.0    -      -       +      +
    112t  ASN      5.9     0.4    -      -       -      +
    113t  ALA*     4.1    20.2    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with TYR 76 (chain t). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     59t  VAL*     4.4     3.3    -      -       -      +
     63t  LEU*     3.6    28.5    -      -       +      -
     68t  ILE*     4.0    17.6    -      -       +      +
     72t  ASN*     3.0    28.3    -      -       +      -
     73t  ARG      3.0     6.0    +      -       -      +
     75t  ILE*     1.3    80.9    -      -       +      +
     77t  GLN*     1.3    61.0    +      -       -      +
     79t  PHE*     3.3     6.0    +      -       -      +
     80t  GLY*     2.8    26.9    +      -       -      -
    112t  ASN      5.0     0.3    +      -       -      -
    113t  ALA*     3.9     8.6    -      -       +      -
    114t  ASN*     2.9    37.7    +      -       -      +
    117t  VAL*     3.7    31.1    -      -       +      +
    118t  LEU*     3.7    30.7    -      -       +      -
    121t  VAL*     4.2    12.5    -      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with GLN 77 (chain t). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     817    A      3.4    33.3    +      -       +      +
     827    T      3.1    20.9    +      -       -      +
     55t  VAL*     5.4     0.7    -      -       -      +
     56t  ASN*     3.4    24.8    +      -       -      +
     59t  VAL*     3.3    20.9    -      -       -      +
     60t  SER*     3.5    26.5    -      -       -      +
     63t  LEU*     4.0     2.1    -      -       +      +
     73t  ARG      2.8    22.8    +      -       -      +
     74t  ALA*     3.2     9.4    +      -       -      +
     76t  TYR*     1.3    77.2    -      -       -      +
     78t  GLY*     1.3    56.3    +      -       -      +
     80t  GLY*     3.3     0.9    +      -       -      -
     81t  LEU*     2.9    41.7    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with GLY 78 (chain t). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     817    A      5.4     1.2    +      -       -      -
    2688    T      5.1     3.4    -      -       -      -
    2698    A      4.1    26.2    -      -       -      +
     74t  ALA      2.9    16.0    +      -       -      -
     75t  ILE      3.8     1.8    -      -       -      -
     77t  GLN*     1.3    76.6    -      -       -      +
     79t  PHE*     1.3    61.5    +      -       -      +
     81t  LEU*     3.4     5.5    +      -       -      +
     82t  LYS*     3.0    23.9    +      -       -      +
    107t  TYR*     3.5    13.2    +      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with PHE 79 (chain t). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     75t  ILE      3.1    13.6    +      -       -      +
     76t  TYR      3.5     7.4    -      -       -      +
     78t  GLY*     1.3    76.1    -      -       -      +
     80t  GLY*     1.3    64.5    +      -       -      +
     82t  LYS*     3.1     5.6    +      -       -      +
     83t  VAL*     2.9    33.1    +      -       +      +
    100t  ILE*     5.1     2.0    -      -       +      -
    103t  LEU*     3.7    24.0    -      -       +      -
    104t  LYS*     3.8    23.6    -      -       +      -
    107t  TYR*     3.5    33.9    +      +       +      -
    118t  LEU*     3.3    52.7    -      -       +      -
    121t  VAL*     3.8    16.8    -      -       +      -
    122t  VAL*     3.7    24.7    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with GLY 80 (chain t). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     55t  VAL*     4.5     6.1    -      -       -      -
     59t  VAL*     5.0     2.0    -      -       -      -
     76t  TYR      2.8    16.5    +      -       -      -
     77t  GLN*     3.8     1.3    -      -       -      -
     79t  PHE*     1.3    73.4    -      -       -      +
     81t  LEU*     1.3    62.5    +      -       -      +
     83t  VAL*     3.1     2.9    +      -       -      -
     84t  ALA*     3.0    19.2    +      -       -      +
    121t  VAL*     3.5    26.9    -      -       -      -
    125t  ILE*     3.1    17.2    -      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with LEU 81 (chain t). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     807    T      5.5     1.3    -      -       -      +
     817    A      5.6     3.6    -      -       -      +
    2698    A      4.1    19.1    -      -       +      +
    2708    T      3.4    36.3    -      -       -      +
     52t  PHE*     3.5    43.1    -      -       +      +
     55t  VAL*     4.5     6.2    -      -       +      +
     56t  ASN*     3.4    30.7    -      -       -      +
     77t  GLN*     2.9    28.5    +      -       +      +
     78t  GLY*     3.7     5.2    -      -       -      +
     80t  GLY*     1.3    75.6    -      -       -      +
     82t  LYS*     1.3    58.2    +      -       -      +
     84t  ALA*     3.2     4.1    +      -       -      -
     85t  ARG      2.9    23.9    +      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with LYS 82 (chain t). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     717    A      6.3     0.2    -      -       -      -
     727    T      3.2    14.3    +      -       -      -
    2698    A      3.7    25.1    +      -       -      +
    2708    T      3.3    29.4    +      -       -      +
    106s  TYR*     2.8    33.2    +      -       -      -
     78t  GLY      3.0    17.3    +      -       -      +
     79t  PHE*     3.5     5.4    -      -       -      +
     81t  LEU*     1.3    74.6    -      -       -      +
     83t  VAL*     1.3    65.4    +      -       -      +
     85t  ARG*     3.3    11.0    +      -       -      +
     86t  ALA*     3.1    21.3    +      -       -      +
     99t  MET*     5.9     2.4    -      -       -      -
    103t  LEU*     3.5    34.6    -      -       +      +
    106t  TYR*     5.0     6.3    -      -       +      -
    107t  TYR*     4.6     3.6    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with VAL 83 (chain t). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     79t  PHE*     2.9    42.3    +      -       +      +
     80t  GLY*     3.1     8.3    +      -       -      +
     82t  LYS*     1.3    76.6    -      -       -      +
     84t  ALA*     1.3    61.9    +      -       -      +
     86t  ALA*     3.3     7.7    +      -       -      +
     87t  LEU*     3.0    20.3    +      -       +      +
     96t  LEU*     4.5     2.6    -      -       +      +
    100t  ILE*     4.3    28.3    -      -       +      -
    103t  LEU*     3.7    19.1    -      -       +      -
    122t  VAL*     4.6     7.6    -      -       +      -
    125t  ILE*     3.8    27.4    -      -       +      -
    126t  THR*     4.5     5.8    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with ALA 84 (chain t). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     51t  LYS      5.7     0.4    -      -       -      +
     52t  PHE*     3.6    20.9    -      -       +      -
     55t  VAL*     4.2    19.5    -      -       +      -
     80t  GLY      3.0    12.2    +      -       -      +
     81t  LEU*     3.5     7.9    -      -       -      +
     83t  VAL*     1.3    73.9    -      -       -      +
     85t  ARG*     1.3    65.6    +      -       -      +
     87t  LEU*     3.1    13.0    +      -       +      +
     88t  ASN*     3.0    25.4    +      -       -      +
    125t  ILE*     4.4    11.0    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with ARG 85 (chain t). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     717    A      3.8    35.9    +      -       -      -
     727    T      2.9    33.7    +      -       -      +
    2708    T      3.0    36.1    +      -       -      +
    2718    A      3.4    28.8    +      -       -      +
     52t  PHE*     3.5    11.1    -      -       -      -
     81t  LEU      2.9    12.8    +      -       -      +
     82t  LYS*     3.3    20.2    -      -       -      +
     83t  VAL      3.2     0.2    -      -       -      -
     84t  ALA*     1.3    75.2    -      -       -      +
     86t  ALA*     1.3    65.1    +      -       -      +
     88t  ASN*     3.0     6.3    +      -       -      +
     89t  ARG*     3.0    46.4    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ALA 86 (chain t). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     717    A      5.6     2.5    -      -       -      -
     82t  LYS      3.1     9.5    +      -       -      +
     83t  VAL*     3.3     9.6    +      -       -      +
     85t  ARG*     1.3    78.6    -      -       -      +
     87t  LEU*     1.3    58.3    +      -       -      +
     89t  ARG*     4.5     2.7    -      -       -      +
     90t  ILE*     2.7    47.1    +      -       +      +
     96t  LEU*     3.8    17.3    -      -       +      -
     99t  MET*     3.8    27.6    -      -       +      -
    100t  ILE*     6.0     0.2    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with LEU 87 (chain t). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     83t  VAL*     3.0    13.6    +      -       +      +
     84t  ALA*     3.1    12.1    +      -       +      +
     86t  ALA*     1.3    75.8    -      -       -      +
     88t  ASN*     1.3    64.0    +      -       -      +
     91t  GLY*     2.7    31.0    +      -       -      +
     92t  SER*     3.6    28.9    -      -       -      +
     96t  LEU*     3.6    24.3    -      -       +      +
    125t  ILE*     4.5    25.6    -      -       +      +
    126t  THR*     6.0     2.5    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with ASN 88 (chain t). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    2718    A      5.8     1.1    -      -       -      +
     48t  ASN*     4.9     6.0    +      -       -      +
     51t  LYS*     3.8    32.7    +      -       -      +
     52t  PHE*     3.4    33.7    -      -       +      -
     84t  ALA*     3.0    12.5    +      -       -      +
     85t  ARG*     3.0     8.3    +      -       -      +
     87t  LEU*     1.3    85.8    -      -       -      +
     89t  ARG*     1.3    64.1    +      -       +      +
     90t  ILE      3.7     0.3    +      -       -      -
     91t  GLY*     4.5     1.4    +      -       -      -
      7u  SER*     4.6    13.7    -      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ARG 89 (chain t). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     697    A      4.6     9.9    +      -       -      -
     707    T      3.6    29.2    +      -       -      +
     717    A      3.3    32.7    +      -       -      +
    2718    A      4.1    17.5    +      -       -      +
    2728    T      4.3    15.4    +      -       -      -
     85t  ARG*     3.0    45.8    +      -       -      +
     86t  ALA*     4.3     2.0    -      -       -      +
     88t  ASN*     1.3    80.7    -      -       +      +
     90t  ILE*     1.3    62.9    +      -       +      +
      7u  SER*     4.1    32.7    -      -       -      +
      8u  ARG*     6.2     0.2    -      -       -      +
     60v  SER*     4.5     6.1    +      -       -      -
     73v  ARG*     4.6     1.7    +      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with ILE 90 (chain t). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     707    T      5.6     0.4    -      -       -      +
     717    A      4.5    12.1    -      -       -      +
     86t  ALA*     2.7    29.7    +      -       +      +
     88t  ASN      4.8     0.4    -      -       -      -
     89t  ARG*     1.3    78.0    -      -       -      +
     91t  GLY*     1.3    68.7    -      -       -      +
     95t  ALA*     3.6    26.2    -      -       +      +
     96t  LEU*     4.0     5.4    -      -       +      +
     99t  MET*     3.8    38.4    -      -       +      -
     60v  SER*     4.9     1.9    +      -       -      -
     61v  ALA*     5.8     0.7    -      -       -      -
     64v  THR*     2.6    36.8    +      -       +      +
     69v  THR*     4.4    10.3    -      -       +      -
     73v  ARG*     3.7    19.1    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with GLY 91 (chain t). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     86t  ALA      3.6     0.6    +      -       -      -
     87t  LEU*     2.7    30.4    +      -       -      -
     88t  ASN      4.5     0.9    -      -       -      -
     89t  ARG      3.9     0.2    -      -       -      -
     90t  ILE*     1.3    91.1    -      -       -      +
     92t  SER*     1.3    68.7    +      -       -      +
     96t  LEU*     3.4     9.2    -      -       -      +
     64v  THR*     3.6     1.1    -      -       -      +
----------------------------------------------------------
 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