Contacts of the helix formed by residues 894 - 917 (chain A) in PDB entry 1MUK


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

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

Legend:
Dist - nearest distance (Å) between atoms of two residues
Surf - contact surface area (Å2) between two residues
HB   - hydrophilic-hydrophilic contact (hydrogen bond)
Arom - aromatic-aromatic contact
Phob - hydrophobic-hydrophobic contact
DC   - hydrophobic-hydrophilic contact (destabilizing contact)
+/-  - indicates presence/absence of a specific contacts
*    - indicates residues forming contacts  by their side chain
       (including CA atoms)
Residues in contact with THR 894 (chain A).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    826A  PHE*     4.9     3.9    -      -       -      -
    872A  TYR      3.6     3.6    +      -       -      -
    873A  TRP*     3.1    28.9    +      -       -      -
    874A  GLY*     4.0     3.7    -      -       -      -
    893A  PRO*     1.3    74.7    -      -       -      +
    895A  GLY*     1.3    72.7    +      -       -      +
    897A  LEU*     3.4     8.5    +      -       -      +
    898A  GLY      3.2     8.8    +      -       -      -
   1181A  PRO*     5.0     6.7    -      -       +      +
----------------------------------------------------------
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Residues in contact with GLY 895 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    872A  TYR*     2.8    51.1    +      -       -      +
    894A  THR*     1.3    80.5    -      -       -      +
    896A  ASP*     1.3    63.7    +      -       -      -
    898A  GLY      3.1     0.2    +      -       -      -
    899A  MET*     3.0    23.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASP 896 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    872A  TYR*     3.8     8.3    +      -       -      -
    895A  GLY*     1.3    70.8    -      -       -      -
    897A  LEU*     1.3    57.4    +      -       -      +
    899A  MET*     3.6     4.9    -      -       -      +
    900A  TYR*     2.9    31.6    +      -       -      +
    946A  TYR*     2.4    35.8    +      -       -      -
   1050A  SER*     2.6    26.3    +      -       -      -
   1052A  LEU*     4.3     7.7    -      -       +      +
   1053A  LEU*     3.5    17.1    +      -       +      +
   1056A  TYR*     4.4    13.9    -      -       +      -
   1178A  LEU*     6.3     0.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 897 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    893A  PRO*     3.6    26.2    -      -       +      -
    894A  THR      3.4     4.6    +      -       -      +
    895A  GLY      3.3     1.0    -      -       -      -
    896A  ASP*     1.3    78.4    -      -       -      +
    898A  GLY*     1.3    59.1    +      -       -      +
    900A  TYR*     3.6     4.0    +      -       +      +
    901A  SER*     3.0    29.9    +      -       -      +
   1056A  TYR*     4.8     2.6    -      -       -      -
   1178A  LEU*     3.9    21.5    -      -       +      +
   1179A  ALA      4.6     4.0    -      -       -      +
   1181A  PRO*     4.6    10.5    -      -       +      -
   1184A  TRP*     5.0     3.4    -      -       +      -
   1224A  PHE*     3.9    43.3    -      -       +      +
   1225A  LEU*     3.8    30.7    -      -       +      -
   1228A  GLY*     4.6     3.8    -      -       -      -
----------------------------------------------------------
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Residues in contact with GLY 898 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    892A  MET*     4.0     7.1    -      -       -      +
    893A  PRO*     3.2    37.1    -      -       -      +
    894A  THR      3.2     6.3    +      -       -      -
    895A  GLY      3.1     5.7    +      -       -      -
    897A  LEU*     1.3    74.5    -      -       -      +
    899A  MET*     1.3    64.8    +      -       -      +
    901A  SER*     3.1     2.1    +      -       -      -
    902A  TRP*     3.0    30.7    +      -       -      -
----------------------------------------------------------
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Residues in contact with MET 899 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    868A  TRP*     5.1     5.6    -      -       +      +
    871A  VAL*     4.2    13.7    -      -       -      -
    872A  TYR*     3.9    30.5    -      -       +      -
    895A  GLY      3.0    19.7    +      -       -      +
    896A  ASP      3.6     4.5    -      -       -      +
    898A  GLY*     1.3    75.8    -      -       -      +
    900A  TYR*     1.3    62.7    +      -       -      +
    902A  TRP*     3.4    39.9    +      -       +      +
    903A  ILE*     3.2    35.1    +      -       +      +
    942A  LEU*     4.1    11.9    -      -       +      +
    946A  TYR*     3.9    24.0    -      -       +      -
   1049A  PHE*     4.0    18.4    -      -       +      -
   1053A  LEU*     3.7    13.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with TYR 900 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    896A  ASP      2.9    17.5    +      -       -      +
    897A  LEU*     3.8     7.2    -      -       -      +
    899A  MET*     1.3    78.9    -      -       -      +
    901A  SER*     1.3    60.8    +      -       -      +
    903A  ILE*     4.1     3.3    -      -       -      +
    904A  SER*     3.0    48.8    +      -       -      -
   1053A  LEU*     3.5    14.5    -      -       +      +
   1056A  TYR*     3.0    46.2    -      -       +      -
   1057A  LEU*     3.8    14.1    -      -       +      -
   1059A  VAL*     2.8    16.9    +      -       -      +
   1061A  TRP*     2.8    30.4    +      -       -      -
   1225A  LEU*     3.6    43.1    -      -       +      -
   1229A  MET*     4.2     6.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with SER 901 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    893A  PRO*     4.0     0.9    -      -       -      +
    897A  LEU      3.0    15.6    +      -       -      -
    898A  GLY*     3.1    11.5    +      -       -      -
    900A  TYR*     1.3    82.0    -      -       -      +
    902A  TRP*     1.3    67.0    +      -       -      +
    903A  ILE      3.3     0.2    +      -       -      -
    904A  SER*     3.9     1.6    -      -       -      -
    905A  LEU*     3.1    28.9    +      -       -      +
   1228A  GLY*     2.8    32.8    -      -       -      -
   1229A  MET*     3.2     6.0    +      -       -      +
   1232A  THR*     3.2    23.5    +      -       -      -
----------------------------------------------------------
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Residues in contact with TRP 902 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    868A  TRP*     3.5    31.4    -      +       -      -
    871A  VAL*     3.3    27.7    -      -       +      +
    877A  LEU*     3.7    22.0    -      -       +      +
    881A  PHE*     4.0     8.3    -      +       -      -
    888A  PHE*     3.7    29.8    -      +       +      -
    892A  MET*     3.8    13.9    -      -       -      -
    898A  GLY      3.0    29.1    +      -       -      +
    899A  MET*     3.4    33.3    -      -       +      +
    901A  SER*     1.3    76.1    -      -       -      +
    903A  ILE*     1.3    79.1    +      -       +      +
    905A  LEU*     3.5     5.2    +      -       -      +
    906A  ILE*     3.4    32.8    +      -       +      +
    910A  MET*     3.8    28.0    -      -       +      -
    942A  LEU*     4.1     8.5    -      -       +      -
   1232A  THR*     4.2     1.1    -      -       +      +
----------------------------------------------------------
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Residues in contact with ILE 903 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    899A  MET*     3.2    29.7    +      -       +      +
    900A  TYR*     4.1     2.2    -      -       -      +
    902A  TRP*     1.3   106.7    -      -       +      +
    904A  SER*     1.3    57.8    +      -       -      +
    906A  ILE*     3.1     3.3    +      -       -      +
    907A  ARG*     2.7    40.9    +      -       +      -
    910A  MET*     4.0    15.7    -      -       +      +
    928A  PHE*     4.0    22.4    -      -       +      -
    937A  PHE*     5.7     0.4    -      -       +      -
    942A  LEU*     5.8     0.4    -      -       +      -
   1049A  PHE*     4.3    28.3    -      -       +      -
   1053A  LEU*     5.3     1.6    -      -       +      -
   1057A  LEU*     3.8    27.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with SER 904 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    900A  TYR*     3.0    45.1    +      -       -      -
    901A  SER      3.9     1.1    -      -       -      -
    903A  ILE*     1.3    77.7    -      -       -      +
    905A  LEU*     1.3    61.9    -      -       -      +
    906A  ILE      3.4     0.7    +      -       -      -
    907A  ARG*     3.6    20.3    +      -       -      +
    908A  PRO*     4.6     3.1    -      -       -      +
   1057A  LEU*     4.5     3.8    -      -       -      +
   1059A  VAL      4.4     3.3    +      -       -      -
   1060A  LYS*     6.4     0.7    -      -       -      -
   1061A  TRP*     5.7     0.2    -      -       -      -
   1229A  MET*     3.5    32.6    -      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 905 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    887A  ILE*     5.0     1.8    -      -       +      +
    888A  PHE*     3.6    21.3    -      -       +      -
    901A  SER      3.1    16.0    +      -       -      +
    902A  TRP      3.6     5.8    -      -       -      +
    903A  ILE      3.1     0.2    -      -       -      -
    904A  SER*     1.3    79.8    -      -       -      +
    906A  ILE*     1.3    63.7    +      -       +      +
    908A  PRO*     4.9     3.1    -      -       -      +
   1063A  MET*     3.0    41.7    -      -       +      +
   1229A  MET*     3.8    11.0    -      -       +      +
   1232A  THR*     3.5    37.0    -      -       +      -
   1233A  ALA*     3.9    22.2    -      -       +      +
----------------------------------------------------------
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Residues in contact with ILE 906 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    880A  ALA*     4.2    14.4    -      -       +      +
    881A  PHE*     4.1    26.2    -      -       +      -
    883A  SER*     4.3     9.2    -      -       -      -
    887A  ILE*     3.8    28.5    -      -       +      -
    888A  PHE*     3.8    22.2    -      -       +      -
    902A  TRP*     3.4    21.5    -      -       +      +
    903A  ILE      3.1     0.6    +      -       -      -
    905A  LEU*     1.3    83.3    -      -       +      +
    907A  ARG*     1.3    66.8    +      -       -      +
    908A  PRO*     3.4     4.9    -      -       -      -
    909A  LEU*     2.9    18.0    +      -       +      -
    910A  MET*     2.8    29.1    +      -       +      +
----------------------------------------------------------
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Residues in contact with ARG 907 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    903A  ILE*     2.7    22.1    +      -       +      +
    904A  SER*     3.9    13.7    +      -       -      +
    905A  LEU      3.6     1.0    -      -       -      -
    906A  ILE*     1.3    70.8    -      -       -      +
    908A  PRO*     1.3    87.6    -      -       +      +
    910A  MET*     3.0    10.5    +      -       -      +
    911A  THR*     3.0    30.0    +      -       -      +
    926A  THR      5.4     0.2    +      -       -      -
    927A  VAL*     2.9    50.7    +      -       +      +
    928A  PHE*     4.5     8.5    -      -       +      -
   1057A  LEU*     5.5     3.4    -      -       -      -
   1060A  LYS*     4.4    32.9    -      -       -      +
----------------------------------------------------------
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Residues in contact with PRO 908 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    904A  SER      4.6     4.7    -      -       -      +
    905A  LEU      4.9     2.5    -      -       -      +
    906A  ILE*     3.5     5.4    -      -       -      -
    907A  ARG*     1.3   114.2    -      -       +      +
    909A  LEU*     1.3    59.4    +      -       +      +
    911A  THR*     3.3     8.1    +      -       -      +
    912A  ARG*     2.9    30.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 909 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    881A  PHE*     3.1    27.6    -      -       +      +
    882A  GLY*     3.8    12.6    -      -       -      +
    883A  SER*     4.6    12.8    -      -       -      -
    906A  ILE*     2.9    29.3    +      -       +      +
    908A  PRO*     1.3    84.5    -      -       +      +
    910A  MET*     1.3    55.0    +      -       -      +
    912A  ARG*     3.2    38.8    +      -       -      +
    913A  TRP*     2.8    31.6    +      -       +      +
----------------------------------------------------------
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Residues in contact with MET 910 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    881A  PHE*     3.5    52.9    -      -       +      -
    902A  TRP*     3.8    18.8    -      -       +      -
    903A  ILE*     4.0    31.0    -      -       +      +
    906A  ILE*     2.8    32.8    +      -       +      +
    907A  ARG*     3.0     6.7    +      -       -      +
    909A  LEU*     1.3    70.1    -      -       -      +
    911A  THR*     1.3    60.0    +      -       -      +
    913A  TRP*     3.2     0.5    +      -       -      +
    914A  MET*     2.8    46.4    +      -       +      +
    928A  PHE*     4.3     7.0    -      -       +      -
    937A  PHE*     4.1    25.4    -      -       +      -
    942A  LEU*     4.8     0.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with THR 911 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    907A  ARG*     3.0    15.7    +      -       -      -
    908A  PRO*     3.5    10.4    -      -       -      +
    910A  MET*     1.3    76.1    -      -       -      +
    912A  ARG*     1.3    65.3    +      -       -      +
    914A  MET*     3.2    10.3    +      -       -      +
    915A  VAL*     3.1    32.7    +      -       +      +
    927A  VAL      4.1     3.1    +      -       -      -
    928A  PHE*     3.2    44.3    -      -       -      +
    929A  GLY*     4.6     4.3    -      -       -      +
    930A  ASN      4.7     2.0    -      -       -      +
    931A  ALA*     4.2     6.1    -      -       +      +
----------------------------------------------------------
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Residues in contact with ARG 912 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    882A  GLY*     4.9     6.7    +      -       -      -
    908A  PRO      2.9    17.9    +      -       -      +
    909A  LEU*     3.5    37.4    -      -       -      +
    911A  THR*     1.3    80.4    -      -       -      +
    913A  TRP*     1.3    60.8    +      -       -      +
    915A  VAL*     3.6     4.1    +      -       -      +
    916A  ALA*     3.0    26.0    +      -       +      +
----------------------------------------------------------
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Residues in contact with TRP 913 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     21A  ASP*     4.7     6.0    +      -       -      -
    881A  PHE*     3.6    54.3    -      +       +      +
    882A  GLY*     4.3     3.6    -      -       -      -
    909A  LEU*     2.8    20.4    +      -       +      +
    910A  MET      3.7     2.7    -      -       -      +
    912A  ARG*     1.3    73.3    -      -       -      +
    914A  MET*     1.3    74.0    +      -       +      +
    916A  ALA*     3.3     5.9    +      -       +      +
    917A  ASN*     3.0    57.4    +      -       +      +
    919A  TYR*     3.9    22.4    -      +       -      -
    936A  CYS*     3.8    24.2    -      -       -      -
    940A  LEU*     4.2    18.8    -      -       +      -
----------------------------------------------------------
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Residues in contact with MET 914 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    881A  PHE*     5.0     2.9    -      -       +      -
    910A  MET*     2.8    34.9    +      -       +      +
    911A  THR      3.2     2.4    +      -       -      +
    913A  TRP*     1.3    82.4    -      -       +      +
    915A  VAL*     1.3    57.1    +      -       -      +
    917A  ASN      3.2     5.5    +      -       -      -
    919A  TYR*     2.7    42.6    +      -       +      +
    928A  PHE*     3.6    35.9    -      -       +      -
    931A  ALA*     3.7    22.9    -      -       +      -
    933A  TYR*     3.7    17.7    -      -       +      -
    936A  CYS*     3.6    39.3    -      -       -      -
    937A  PHE*     3.9     9.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with VAL 915 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    911A  THR*     3.1    22.1    +      -       +      +
    912A  ARG*     3.9     4.3    -      -       -      +
    914A  MET*     1.3    70.5    -      -       -      +
    916A  ALA*     1.3    70.4    +      -       -      +
    917A  ASN      2.9     1.3    -      -       -      -
    918A  GLY*     2.8    17.3    +      -       -      -
    919A  TYR      3.8     7.4    -      -       -      +
    920A  VAL*     4.3    19.5    -      -       +      +
    930A  ASN*     4.1    26.0    -      -       +      +
    931A  ALA*     4.1     9.6    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 916 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    912A  ARG*     3.0    17.4    +      -       +      +
    913A  TRP*     3.6     8.7    -      -       +      +
    915A  VAL*     1.3    81.8    -      -       -      +
    917A  ASN*     1.3    62.1    +      -       -      +
    918A  GLY      3.6     1.7    +      -       -      -
----------------------------------------------------------
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Residues in contact with ASN 917 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    913A  TRP*     3.0    57.0    +      -       +      +
    914A  MET      3.2     2.4    +      -       -      +
    915A  VAL      2.8     1.8    +      -       -      -
    916A  ALA*     1.3    83.1    -      -       -      +
    918A  GLY*     1.3    56.9    +      -       -      +
    919A  TYR*     3.3    28.8    +      -       +      -
    935A  ARG*     5.3     1.9    +      -       -      -
----------------------------------------------------------
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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