Contacts of the helix formed by residues 191 - 217 (chain U) in PDB entry 5LN3


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 ILE 191 (chain U).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    364O  GLU*     5.9     0.2    -      -       +      -
    367O  VAL*     3.8    44.6    -      -       +      +
    368O  GLU*     5.1    11.7    -      -       +      +
    370O  GLN      4.6     2.0    -      -       -      +
    371O  ALA      4.1     4.5    -      -       -      +
    372O  HIS*     4.1    11.9    -      -       -      +
    373O  ASP*     3.6    34.3    -      -       +      +
    190U  ARG*     1.4    75.9    -      -       +      +
    192U  THR*     1.4    61.6    +      -       -      +
    194U  GLN*     3.2    22.9    +      -       +      +
    195U  VAL*     3.3    18.0    +      -       +      +
    223V  LYS*     4.1     1.1    -      -       -      +
----------------------------------------------------------
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Residues in contact with THR 192 (chain U). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    190U  ARG      3.4     0.4    -      -       -      -
    191U  ILE*     1.4    75.3    -      -       -      +
    193U  ASN*     1.4    67.1    +      -       -      +
    195U  VAL*     3.5    11.5    -      -       +      +
    196U  HIS*     3.5    30.7    +      -       +      +
    222V  LYS*     4.5    15.0    -      -       -      +
    223V  LYS*     4.0    37.5    +      -       -      +
    240V  HIS*     4.1    17.3    -      -       -      +
----------------------------------------------------------
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Residues in contact with ASN 193 (chain U). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    190U  ARG*     2.8    31.4    +      -       -      +
    192U  THR*     1.4    78.2    -      -       -      +
    194U  GLN*     1.4    63.4    +      -       -      +
    196U  HIS*     3.1     7.6    +      -       -      +
    197U  GLY*     3.0    24.6    +      -       -      -
    223V  LYS*     4.8     5.7    +      -       -      +
    240V  HIS*     3.6    43.0    +      -       +      +
    241V  ASN*     5.0    13.7    +      -       -      +
    244V  VAL*     3.5    29.9    -      -       -      +
----------------------------------------------------------
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Residues in contact with GLN 194 (chain U). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    360O  VAL*     4.2    17.3    -      -       -      +
    363O  MET*     3.4    43.6    -      -       -      +
    364O  GLU*     3.1    25.8    +      -       +      +
    367O  VAL*     4.4     6.5    -      -       +      -
    190U  ARG*     3.6    34.7    +      -       +      +
    191U  ILE*     3.3    13.5    -      -       -      +
    193U  ASN*     1.4    78.5    -      -       -      +
    195U  VAL*     1.4    62.9    +      -       -      +
    197U  GLY*     3.1    12.0    +      -       -      +
    198U  LEU*     3.2     8.1    +      -       -      +
    240U  VAL*     6.3     0.6    -      -       -      +
    241V  ASN*     6.1     1.0    -      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 195 (chain U). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    364O  GLU*     3.4    28.3    -      -       +      +
    368O  GLU*     5.7     4.9    -      -       +      -
    131U  LEU*     5.9     6.1    -      -       +      -
    191U  ILE*     3.3    19.9    +      -       +      +
    192U  THR*     3.5    17.0    -      -       +      +
    194U  GLN*     1.4    75.4    -      -       -      +
    196U  HIS*     1.3    78.7    +      -       +      +
    198U  LEU*     3.5     5.5    +      -       -      +
    199U  LYS*     3.2    20.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with HIS 196 (chain U). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    130U  ASP*     5.8     1.3    -      -       -      -
    131U  LEU*     3.4    28.5    +      -       +      +
    132U  GLY*     3.8    23.8    -      -       -      -
    192U  THR*     3.6    11.3    +      -       +      +
    193U  ASN      3.1     9.5    +      -       -      +
    195U  VAL*     1.3    91.5    -      -       +      +
    197U  GLY*     1.3    59.4    -      -       -      +
    199U  LYS*     3.0    34.1    +      -       +      +
    200U  GLY      3.2     5.5    +      -       -      -
    222V  LYS*     4.3    11.3    +      -       -      -
    236V  GLU*     4.8     1.1    -      -       +      -
    237V  HIS*     3.3    33.0    +      -       +      +
    240V  HIS*     3.4    31.4    +      -       +      -
----------------------------------------------------------
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Residues in contact with GLY 197 (chain U). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    360O  VAL*     4.9     3.8    -      -       -      -
    193U  ASN      3.0    12.8    +      -       -      -
    194U  GLN*     3.1     5.7    +      -       -      -
    196U  HIS*     1.3    76.0    -      -       -      +
    198U  LEU*     1.4    64.0    +      -       -      +
    199U  LYS      3.4     0.2    +      -       -      -
    200U  GLY*     3.5     2.3    +      -       -      -
    201U  LEU*     3.4    26.3    +      -       -      +
    237V  HIS*     3.9    13.4    -      -       -      -
    241V  ASN*     5.1    11.0    -      -       -      -
----------------------------------------------------------
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Residues in contact with LEU 198 (chain U). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    357O  CYS      3.2    29.2    -      -       -      +
    360O  VAL*     4.3     5.2    -      -       +      +
    361O  LYS*     4.0    40.4    -      -       +      +
    364O  GLU*     3.6    33.2    -      -       -      +
    365O  MET*     6.1     0.9    -      -       +      -
    194U  GLN      3.2     4.6    +      -       -      +
    195U  VAL      3.6     6.1    -      -       -      +
    197U  GLY*     1.4    73.1    -      -       -      +
    199U  LYS*     1.3    62.4    +      -       -      +
    201U  LEU*     3.2    16.8    +      -       +      +
    202U  ASN*     3.0    41.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 199 (chain U). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    129U  LYS      3.6    19.6    +      -       -      -
    130U  ASP*     3.4    28.2    +      -       -      +
    131U  LEU*     4.0    26.0    -      -       +      +
    195U  VAL      3.2    10.8    +      -       -      +
    196U  HIS*     3.0    26.4    +      -       +      +
    198U  LEU*     1.3    80.0    -      -       -      +
    200U  GLY*     1.3    56.1    +      -       -      +
    202U  ASN*     3.2    13.7    +      -       -      +
    203U  SER*     3.1    33.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLY 200 (chain U). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    439P  VAL*     5.5     7.5    -      -       -      +
    196U  HIS      3.2     7.8    +      -       -      -
    197U  GLY      3.5     4.2    +      -       -      -
    198U  LEU      3.2     0.4    -      -       -      -
    199U  LYS*     1.3    76.6    -      -       -      +
    201U  LEU*     1.4    62.6    +      -       -      +
    203U  SER*     3.0    19.5    +      -       -      -
    204U  LYS*     3.2    20.8    +      -       -      +
    237V  HIS*     4.1    16.6    -      -       -      -
----------------------------------------------------------
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Residues in contact with LEU 201 (chain U). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    353O  LEU*     4.6     6.0    -      -       +      +
    356O  TRP*     4.0    40.4    -      -       +      +
    357O  CYS*     3.7    41.1    -      -       +      +
    360O  VAL*     4.0    25.1    -      -       +      -
    435P  LEU*     5.8     5.4    -      -       +      -
    197U  GLY      3.4    13.9    +      -       -      +
    198U  LEU*     3.2    14.5    +      -       -      +
    200U  GLY*     1.4    74.4    -      -       -      +
    202U  ASN*     1.4    57.7    +      -       -      +
    204U  LYS*     3.5    17.5    +      -       +      +
    205U  LEU*     3.2    25.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASN 202 (chain U). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    357O  CYS*     3.9    22.8    -      -       -      +
    361O  LYS*     5.1     5.9    -      -       -      +
    198U  LEU*     3.0    37.1    +      -       -      +
    199U  LYS*     3.2    10.1    +      -       -      +
    201U  LEU*     1.4    73.7    -      -       -      +
    203U  SER*     1.4    65.0    +      -       -      +
    205U  LEU*     3.2    13.5    +      -       +      +
    206U  LEU*     3.0    35.3    +      -       +      +
----------------------------------------------------------
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Residues in contact with SER 203 (chain U). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    442P  THR*     5.9     0.2    -      -       -      -
    446P  ILE*     5.7     6.5    -      -       -      -
    199U  LYS*     3.1    22.9    +      -       -      +
    200U  GLY*     3.0    11.9    +      -       -      -
    202U  ASN*     1.4    76.0    -      -       -      +
    204U  LYS*     1.3    57.3    +      -       -      +
    206U  LEU*     3.4    15.3    +      -       -      +
    207U  ASP*     2.7    31.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 204 (chain U). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    349O  MET*     6.5     0.2    -      -       -      -
    353O  LEU*     4.0    28.5    -      -       +      -
    356O  TRP*     5.6     5.2    -      -       -      -
    435P  LEU*     5.5     8.4    -      -       +      +
    438P  LEU*     3.9    27.1    -      -       -      +
    439P  VAL*     5.4    17.4    -      -       +      +
    442P  THR*     4.1    25.9    +      -       +      +
    200U  GLY      3.2    15.6    +      -       -      +
    201U  LEU*     3.6    18.8    -      -       +      +
    203U  SER*     1.3    76.4    -      -       -      +
    205U  LEU*     1.3    57.4    +      -       -      +
    207U  ASP*     3.0    26.5    +      -       -      +
    208U  ILE*     3.1    19.4    +      -       +      +
    230U  LEU*     4.4    15.7    -      -       -      +
    233U  VAL*     5.1     4.8    -      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 205 (chain U). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    350O  LYS*     4.0     4.9    -      -       -      +
    353O  LEU*     3.7    20.2    -      -       +      -
    354O  GLU*     3.3    50.0    -      -       -      +
    357O  CYS*     4.1    11.7    -      -       +      -
    201U  LEU      3.2    12.0    +      -       -      +
    202U  ASN*     3.2    17.9    +      -       +      +
    204U  LYS*     1.3    74.7    -      -       -      +
    206U  LEU*     1.4    68.7    +      -       +      +
    208U  ILE*     3.4     5.9    +      -       +      +
    209U  ARG*     3.3    51.3    +      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 206 (chain U). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    202U  ASN*     3.0    21.4    +      -       +      +
    203U  SER*     3.4    16.2    -      -       -      +
    205U  LEU*     1.4    79.7    -      -       +      +
    207U  ASP*     1.4    58.1    -      -       -      +
    209U  ARG*     3.3    14.4    +      -       -      +
    210U  SER*     3.0    33.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASP 207 (chain U). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    442P  THR*     4.0     9.2    -      -       +      +
    446P  ILE*     3.6    36.2    -      -       -      +
    449P  GLU*     4.2    17.1    -      -       -      +
    203U  SER      2.7    21.2    -      -       -      +
    204U  LYS*     3.0    18.9    +      -       -      +
    206U  LEU*     1.4    77.3    -      -       -      +
    208U  ILE*     1.4    51.8    +      -       +      +
    210U  SER*     3.2     9.1    +      -       -      -
    211U  TYR*     2.6    34.9    +      -       -      +
    214U  LYS*     5.1     1.6    +      -       -      -
    226U  ILE*     5.6     6.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with ILE 208 (chain U). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    346O  ILE*     4.4    19.0    -      -       +      +
    349O  MET*     4.9     5.6    -      -       +      -
    350O  LYS*     3.9    36.1    -      -       +      +
    353O  LEU*     3.8    20.4    -      -       +      -
    204U  LYS*     3.1    16.3    +      -       +      +
    205U  LEU*     3.4     6.2    +      -       +      +
    207U  ASP*     1.4    73.7    -      -       +      +
    209U  ARG*     1.3    58.3    +      -       -      +
    211U  TYR*     2.9    11.0    +      -       +      +
    212U  LEU*     2.9    29.7    +      -       +      +
    226U  ILE*     5.2     9.9    -      -       +      -
    230U  LEU*     4.2    31.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with ARG 209 (chain U). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    350O  LYS*     3.6    50.5    +      -       +      +
    351O  ASP*     5.0     0.8    -      -       -      +
    354O  GLU*     3.1    33.8    +      -       -      +
    205U  LEU*     3.3    34.7    +      -       -      +
    206U  LEU*     3.3    13.9    +      -       -      +
    208U  ILE*     1.3    73.5    -      -       -      +
    210U  SER*     1.3    61.8    -      -       -      +
    212U  LEU*     3.3     4.5    +      -       -      +
    213U  GLU*     3.2    37.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with SER 210 (chain U). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    449P  GLU*     5.5     0.9    -      -       -      -
    206U  LEU*     3.0    17.5    +      -       -      +
    207U  ASP*     3.3    13.0    -      -       -      -
    209U  ARG*     1.3    74.9    -      -       -      +
    211U  TYR*     1.4    65.1    +      -       -      +
    213U  GLU*     3.4    17.2    +      -       -      +
    214U  LYS*     3.1    43.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with TYR 211 (chain U). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    341O  LEU*     6.0     2.1    -      -       -      +
    343O  LEU*     5.5     4.1    -      -       +      +
    346O  ILE*     3.7    36.8    -      -       +      -
    207U  ASP      2.6    17.3    +      -       -      +
    208U  ILE*     2.9    16.5    +      -       +      +
    210U  SER*     1.4    73.4    -      -       -      +
    212U  LEU*     1.4    55.9    +      -       -      +
    214U  LYS*     3.1    14.6    +      -       +      +
    215U  VAL*     3.0    51.3    +      -       +      +
    221U  PRO*     3.7    41.0    +      -       +      -
    222U  ILE*     4.7    10.4    -      -       -      +
    223U  ASN      5.0     2.3    +      -       -      -
    226U  ILE*     4.7    28.7    -      -       +      -
    227U  ILE*     4.6    15.8    -      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 212 (chain U). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    346O  ILE*     5.9     5.8    -      -       +      -
    347O  LYS*     4.2    31.9    -      -       +      -
    350O  LYS*     3.9    34.1    -      -       +      +
    208U  ILE*     2.9    11.4    +      -       +      +
    209U  ARG      3.4    11.0    -      -       -      +
    211U  TYR*     1.4    73.5    -      -       -      +
    213U  GLU*     1.3    66.5    +      -       +      +
    215U  VAL*     3.4    15.6    -      -       +      +
    216U  ALA*     3.1    35.5    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLU 213 (chain U). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    209U  ARG*     3.2    31.3    +      -       -      +
    210U  SER*     3.5    16.7    +      -       -      +
    212U  LEU*     1.3    82.2    -      -       +      +
    214U  LYS*     1.3    62.6    -      -       +      +
    216U  ALA*     3.3     8.6    -      -       -      +
    217U  THR*     2.8    34.2    +      -       +      +
----------------------------------------------------------
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Residues in contact with LYS 214 (chain U). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    449P  GLU*     3.0    30.1    +      -       -      -
    453P  HIS*     3.4    36.0    +      -       +      +
    207U  ASP      5.1     0.8    +      -       -      -
    210U  SER*     3.1    36.2    +      -       -      +
    211U  TYR*     3.1    16.8    +      -       -      +
    213U  GLU*     1.3    83.2    -      -       +      +
    215U  VAL*     1.4    55.0    +      -       -      +
    217U  THR*     3.2     8.2    +      -       -      -
    218U  GLY      3.0    23.9    +      -       -      -
    219U  LYS*     3.1    39.0    +      -       +      +
    221U  PRO*     3.7    23.2    -      -       +      +
----------------------------------------------------------
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Residues in contact with VAL 215 (chain U). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    341O  LEU*     6.4     0.7    -      -       +      -
    343O  LEU*     3.9    33.4    -      -       +      -
    346O  ILE*     6.3     0.9    -      -       +      -
    211U  TYR*     3.0    39.1    +      -       +      +
    212U  LEU*     3.4    26.9    -      -       +      +
    214U  LYS*     1.4    71.9    -      -       -      +
    216U  ALA*     1.4    62.2    +      -       -      +
    217U  THR      3.5     0.3    +      -       -      -
    218U  GLY*     3.5    11.4    +      -       -      +
    219U  LYS      5.2     2.5    -      -       -      +
    221U  PRO      4.9     9.0    -      -       -      +
    222U  ILE*     5.8     6.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 216 (chain U). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    212U  LEU*     3.1    21.4    +      -       +      +
    213U  GLU*     3.3    13.7    -      -       -      +
    215U  VAL*     1.4    78.4    -      -       -      +
    217U  THR*     1.4    63.2    +      -       +      +
    218U  GLY      3.9     0.7    +      -       -      -
----------------------------------------------------------
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Residues in contact with THR 217 (chain U). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    213U  GLU*     2.8    22.9    +      -       +      +
    214U  LYS*     3.2     8.2    +      -       -      -
    216U  ALA*     1.4    78.3    -      -       +      +
    218U  GLY*     1.4    62.3    +      -       -      +
    219U  LYS*     3.5    18.9    +      -       -      +
----------------------------------------------------------
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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