Contacts of the helix formed by residues 96 - 116 (chain H) in PDB entry 1TKK


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 ASN 96 (chain H).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     52C  LEU*     4.8     2.4    -      -       -      +
     56C  GLY*     2.8    30.9    +      -       -      +
     61C  SER*     5.7     0.9    -      -       -      -
     55H  THR      5.8     1.2    +      -       -      -
     57H  ASP*     3.4    20.1    +      -       -      +
     61H  SER*     4.0    17.2    +      -       -      +
     62H  ILE*     6.1     0.2    -      -       -      +
     65H  ALA*     4.0    12.0    -      -       -      +
     93H  LEU*     3.5    29.1    -      -       +      +
     94H  THR      3.0    19.4    +      -       -      -
     95H  GLY*     1.3    70.3    -      -       -      +
     97H  MET*     1.3    62.8    +      -       -      +
     98H  SER      3.3     2.9    -      -       -      -
     99H  ALA*     3.3     9.3    +      -       +      +
    100H  LYS*     3.2    22.5    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with MET 97 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     55H  THR*     5.4     4.0    -      -       +      -
     57H  ASP*     3.6     6.0    +      -       -      +
     90H  GLN*     4.0    10.1    -      -       -      +
     95H  GLY*     3.8    23.1    -      -       -      +
     96H  ASN*     1.3    73.8    -      -       -      +
     98H  SER*     1.3    63.5    +      -       -      +
    100H  LYS*     3.5    14.1    +      -       -      -
    101H  ALA*     3.1    25.3    +      -       -      +
    248H  PHE*     4.9     9.6    -      -       +      -
    249H  THR*     4.3    18.4    -      -       +      -
    270H  MET      3.1    19.2    -      -       -      +
    271H  LYS*     3.3    23.8    -      -       -      +
    272H  ALA*     3.5     9.2    -      -       -      +
    273H  GLY*     3.3    25.0    -      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with SER 98 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     48H  ALA*     3.2    19.5    -      -       -      +
     49H  PRO      4.2     3.7    +      -       -      -
     51H  THR*     4.2     3.1    +      -       -      -
     55H  THR*     3.3    20.6    +      -       -      +
     57H  ASP*     2.5    33.2    +      -       -      +
     62H  ILE*     4.0    11.4    -      -       -      -
     97H  MET*     1.3    75.0    -      -       -      +
     99H  ALA*     1.3    65.3    +      -       -      +
    101H  ALA*     3.4     2.1    +      -       -      +
    102H  ALA      3.2    12.1    +      -       -      -
    270H  MET*     3.6    27.1    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ALA 99 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     62H  ILE*     4.0    32.1    -      -       +      +
     65H  ALA*     3.8    28.3    -      -       +      -
     66H  ILE*     4.3     6.5    -      -       +      +
     70H  LEU*     4.5     5.6    -      -       +      -
     93H  LEU*     5.5     0.2    -      -       +      -
     96H  ASN*     3.3    14.2    +      -       +      +
     97H  MET      3.3     0.4    -      -       -      -
     98H  SER*     1.3    76.7    -      -       -      +
    100H  LYS*     1.3    65.5    +      -       +      +
    101H  ALA      3.1     1.0    +      -       -      -
    102H  ALA*     3.2     4.9    +      -       -      +
    103H  VAL*     3.2    24.4    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with LYS 100 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     70H  LEU*     4.3     6.1    -      -       +      -
     89H  ILE*     3.3    42.6    -      -       +      +
     90H  GLN*     3.3    29.7    +      -       -      +
     93H  LEU*     2.6    43.2    +      -       +      -
     94H  THR*     3.9     1.2    -      -       -      +
     95H  GLY      2.7    31.3    +      -       -      +
     96H  ASN      3.2     9.8    +      -       -      +
     97H  MET*     3.8    19.7    -      -       -      +
     98H  SER      3.4     0.2    -      -       -      -
     99H  ALA*     1.3    75.1    -      -       +      +
    101H  ALA*     1.3    56.8    +      -       -      +
    103H  VAL*     3.5     1.2    +      -       -      +
    104H  GLU*     3.0    27.2    +      -       -      +
    273H  GLY*     3.4    16.0    -      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ALA 101 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     97H  MET      3.1    14.8    +      -       -      +
     98H  SER      3.7     5.2    -      -       -      +
     99H  ALA      3.1     0.6    -      -       -      -
    100H  LYS*     1.3    75.8    -      -       -      +
    102H  ALA*     1.3    64.4    +      -       -      +
    104H  GLU*     3.9     1.4    -      -       -      +
    105H  MET*     3.0    30.5    +      -       -      +
    269H  LEU*     3.2    29.2    -      -       +      +
    270H  MET*     3.7    15.7    -      -       +      -
    273H  GLY      3.4     8.9    +      -       -      -
    274H  GLY*     3.4     9.4    -      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ALA 102 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     32H  VAL      5.3     0.2    -      -       -      +
     34H  VAL*     4.0    20.6    -      -       +      +
     46H  GLY*     3.6     7.8    -      -       -      -
     47H  GLU      3.4    38.0    +      -       -      +
     48H  ALA*     3.8     5.8    -      -       +      +
     66H  ILE*     4.5     4.3    -      -       +      -
     98H  SER      3.2    11.6    +      -       -      +
     99H  ALA      3.6     8.1    -      -       -      +
    101H  ALA*     1.3    76.7    -      -       -      +
    103H  VAL*     1.3    62.4    +      -       -      +
    105H  MET*     3.2    13.4    +      -       -      +
    106H  ALA*     3.4    10.0    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with VAL 103 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      6H  ILE*     5.4     5.4    -      -       +      -
     34H  VAL*     4.8    12.3    -      -       +      -
     36H  ILE*     4.0     7.9    -      -       +      +
     66H  ILE*     4.1    24.2    -      -       +      -
     70H  LEU*     3.7    27.8    -      -       +      -
     74H  LEU*     3.7    29.4    -      -       +      -
     89H  ILE*     3.8    16.8    -      -       +      -
     99H  ALA      3.2     7.1    +      -       -      +
    100H  LYS      3.8     7.0    -      -       -      +
    102H  ALA*     1.3    78.4    -      -       -      +
    104H  GLU*     1.3    57.2    +      -       -      +
    105H  MET      3.3     0.2    +      -       -      -
    106H  ALA*     3.4     4.4    +      -       -      +
    107H  LEU*     3.0    25.7    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with GLU 104 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     86H  LEU*     3.3    26.9    -      -       +      +
     89H  ILE*     4.2     9.8    -      -       +      +
     90H  GLN*     2.7    27.6    +      -       -      +
    100H  LYS      3.0    19.5    +      -       -      +
    101H  ALA      3.9     0.2    -      -       -      +
    102H  ALA      3.3     0.2    -      -       -      -
    103H  VAL*     1.3    73.8    -      -       -      +
    105H  MET*     1.3    59.5    +      -       -      +
    107H  LEU*     3.6     6.0    -      -       -      +
    108H  TYR*     2.9    42.9    +      -       +      -
    273H  GLY      3.2     8.0    -      -       -      +
    274H  GLY*     3.9    12.8    -      -       -      -
    275H  ILE*     3.0     6.4    +      -       -      +
    276H  SER*     2.8    42.5    +      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with MET 105 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     45H  TRP      3.3    10.2    -      -       -      +
     46H  GLY*     3.9     2.5    -      -       -      -
     47H  GLU*     3.4    24.7    -      -       -      +
    101H  ALA      3.0    14.7    +      -       -      +
    102H  ALA      3.2     6.7    +      -       -      +
    104H  GLU*     1.3    77.4    -      -       -      +
    106H  ALA*     1.3    60.1    +      -       -      +
    108H  TYR*     3.4     2.3    +      -       -      +
    109H  ASP*     3.0    28.1    +      -       -      +
    269H  LEU*     4.0    24.2    -      -       +      -
    270H  MET*     3.3    35.0    -      -       +      -
    274H  GLY*     6.0     0.4    -      -       -      -
    275H  ILE*     4.1     9.2    -      -       +      +
    299H  GLU*     4.3     2.5    -      -       -      +
    302H  LEU*     5.0     2.7    -      -       -      +
    303H  GLY*     4.1    21.5    -      -       -      +
    306H  ALA*     3.5    30.3    -      -       +      -
    352H  LEU*     4.0     5.4    -      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with ALA 106 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     34H  VAL*     4.4     5.6    -      -       +      -
     36H  ILE*     3.4    30.7    -      -       +      +
     38H  TYR*     3.0     8.6    +      -       -      -
     44H  GLY*     3.6    19.0    -      -       -      +
     45H  TRP      3.0    21.9    +      -       -      +
     46H  GLY      4.2     1.1    -      -       -      +
    102H  ALA      3.4     6.1    +      -       -      +
    103H  VAL      3.4     3.7    +      -       -      +
    104H  GLU      3.4     0.2    -      -       -      -
    105H  MET*     1.3    76.4    -      -       -      +
    107H  LEU*     1.3    62.7    +      -       -      +
    109H  ASP*     3.2     3.3    +      -       -      +
    110H  GLY      3.0    19.6    +      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with LEU 107 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      3H  ILE*     3.9    19.5    -      -       +      -
     36H  ILE*     4.0     3.3    -      -       +      +
     38H  TYR*     3.3     9.0    +      -       -      +
     74H  LEU*     5.0     2.7    -      -       +      -
     79H  LEU*     3.3    31.8    -      -       +      +
     82H  TYR*     4.5    14.1    -      -       +      -
     85H  ILE*     4.2    23.1    -      -       +      -
     86H  LEU*     3.9    31.4    -      -       +      -
     89H  ILE*     4.4     4.3    -      -       +      -
    103H  VAL*     3.0    18.6    +      -       +      +
    104H  GLU*     3.6     7.4    -      -       -      +
    106H  ALA*     1.3    77.3    -      -       -      +
    108H  TYR*     1.3    61.3    +      -       +      +
    110H  GLY      3.4     0.5    +      -       -      -
    111H  TRP*     3.0    28.9    +      -       +      +
----------------------------------------------------------
 Back to top of page

Residues in contact with TYR 108 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     82H  TYR*     4.5    12.7    -      +       -      -
     86H  LEU*     3.6    22.5    -      -       +      +
    104H  GLU*     2.9    48.4    +      -       +      +
    105H  MET      4.0     0.7    -      -       -      +
    107H  LEU*     1.3    77.9    -      -       +      +
    109H  ASP*     1.3    65.7    +      -       -      +
    111H  TRP*     3.7    20.7    -      +       +      +
    112H  ALA*     3.1    25.3    +      -       -      +
    119H  LEU*     3.6    28.9    -      -       +      +
    123H  LEU*     4.2    19.3    -      -       +      -
    275H  ILE*     3.7    36.5    -      -       +      +
    276H  SER*     3.4    23.6    -      -       -      -
    279H  GLU*     4.6     7.1    +      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with ASP 109 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     44H  GLY*     3.5     7.5    -      -       -      -
     45H  TRP*     3.1    27.9    +      -       -      -
    105H  MET      3.0    13.3    +      -       -      +
    106H  ALA      3.2     9.9    -      -       -      +
    108H  TYR*     1.3    77.9    -      -       -      +
    110H  GLY*     1.3    57.9    +      -       -      +
    113H  GLN*     2.7    51.3    +      -       -      +
    119H  LEU*     4.7     0.6    -      -       -      +
    351H  GLY*     3.3     4.1    -      -       -      -
    352H  LEU*     2.9    49.5    +      -       +      +
    353H  GLY      4.5     1.9    +      -       -      -
    354H  ILE*     5.3     0.7    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with GLY 110 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      1H  MET*     3.8     4.7    -      -       -      +
     38H  TYR*     3.7    28.7    -      -       -      -
     79H  LEU*     3.4     8.6    -      -       -      +
    106H  ALA      3.0    10.9    +      -       -      -
    107H  LEU      3.9     1.1    -      -       -      -
    109H  ASP*     1.3    74.4    -      -       -      +
    111H  TRP*     1.3    55.7    +      -       -      +
    113H  GLN*     3.5    12.2    -      -       -      +
    114H  MET*     2.8    33.1    +      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with TRP 111 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     82G  TYR*     5.7     0.2    -      -       -      -
    111G  TRP*     4.5     6.5    -      +       -      -
    117G  LEU*     6.1     0.2    -      -       -      +
    121G  GLN      5.0     1.4    +      -       -      -
    122G  MET*     3.8    30.1    +      -       +      -
     79H  LEU*     3.3    24.8    +      -       +      +
     82H  TYR*     3.5    35.0    -      +       +      -
    107H  LEU*     3.0    18.9    +      -       +      +
    108H  TYR*     3.7    29.4    -      +       +      +
    109H  ASP      3.2     0.2    -      -       -      -
    110H  GLY*     1.3    77.1    -      -       -      +
    112H  ALA*     1.3    69.7    +      -       -      +
    114H  MET*     3.3    28.4    -      -       +      +
    115H  CYS*     3.0    39.2    +      -       -      -
    119H  LEU*     4.3     7.2    -      -       +      -
    122H  MET*     3.7    48.7    -      -       +      -
    123H  LEU*     4.6     8.7    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with ALA 112 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    108H  TYR      3.1    17.2    +      -       -      +
    111H  TRP*     1.3    74.1    -      -       +      +
    113H  GLN*     1.3    56.6    +      -       -      +
    115H  CYS      3.1     1.4    +      -       -      +
    116H  GLY      2.7    29.3    +      -       -      -
    117H  LEU      3.1    28.6    +      -       -      +
    119H  LEU*     3.7    19.1    -      -       +      -
    122H  MET*     3.5    24.5    -      -       +      -
    351H  GLY*     3.9     7.0    -      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with GLN 113 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      1H  MET*     4.5     4.4    -      -       -      +
     42H  ALA*     3.2    32.3    -      -       +      +
     43H  VAL      3.3    19.7    +      -       -      +
    109H  ASP*     2.7    50.5    +      -       -      +
    110H  GLY*     3.5     9.8    -      -       -      +
    112H  ALA*     1.3    73.1    -      -       -      +
    114H  MET*     1.3    64.7    +      -       -      +
    116H  GLY*     3.1    13.7    +      -       -      -
    350H  PRO*     3.6    31.1    +      -       +      +
    351H  GLY      4.1     0.6    -      -       -      +
----------------------------------------------------------
 Back to top of page

Residues in contact with MET 114 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    115G  CYS      4.8     4.7    -      -       -      +
    117G  LEU*     3.9    32.5    -      -       +      -
      1H  MET*     3.6    46.1    -      -       +      +
     79H  LEU*     3.9    22.4    -      -       +      +
     80H  ALA*     4.7     1.6    -      -       -      -
    110H  GLY      2.8    21.2    +      -       -      +
    111H  TRP*     3.3    35.4    -      -       +      +
    113H  GLN*     1.3    74.9    -      -       -      +
    115H  CYS*     1.3    65.7    +      -       -      +
    116H  GLY*     4.6     0.3    -      -       -      -
----------------------------------------------------------
 Back to top of page

Residues in contact with CYS 115 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    114G  MET*     4.7     2.9    -      -       -      +
    115G  CYS*     3.5    32.3    -      -       -      -
    117G  LEU*     5.6     0.2    -      -       -      -
    122G  MET*     3.7    25.1    -      -       -      -
    111H  TRP*     3.0    26.2    +      -       -      +
    112H  ALA      3.1     1.7    +      -       -      +
    114H  MET*     1.3    88.8    -      -       -      +
    116H  GLY*     1.3    61.2    +      -       -      +
    117H  LEU*     3.5     5.2    +      -       -      +
    122H  MET*     3.5    38.8    -      -       +      -
----------------------------------------------------------
 Back to top of page

Residues in contact with GLY 116 (chain H). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    112H  ALA      2.7     8.1    +      -       -      -
    113H  GLN      3.1    12.5    +      -       -      -
    114H  MET      3.3     1.0    -      -       -      -
    115H  CYS*     1.3    79.5    -      -       -      +
    117H  LEU*     1.3    63.2    +      -       -      +
    118H  PRO*     4.8     0.3    -      -       -      +
    350H  PRO*     3.8    21.2    -      -       -      +
----------------------------------------------------------
 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