Contacts of the helix formed by residues 11 - 36 (chain m) in PDB entry 5W97


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 SER 11 (chain m).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      9m  PRO*     3.8     2.6    +      -       -      +
     10m  THR*     1.3    75.7    -      -       -      +
     12m  PRO*     1.3    76.3    -      -       -      +
     13m  LYS*     3.3    14.6    -      -       -      +
     14m  GLU*     3.0    35.0    +      -       -      +
     15m  GLN*     3.0    21.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with PRO 12 (chain m). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    607a  PGV      4.0    54.0    -      -       +      +
     11m  SER*     1.3    87.4    -      -       -      +
     13m  LYS*     1.3    60.3    +      -       -      +
     15m  GLN*     3.7     4.6    -      -       +      +
     16m  ALA*     3.1    23.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 13 (chain m). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     11m  SER*     3.3    13.0    +      -       -      +
     12m  PRO*     1.3    75.9    -      -       -      +
     14m  GLU*     1.3    68.7    +      -       +      +
     16m  ALA*     3.2    14.4    +      -       -      +
     17m  ILE*     3.3    24.4    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLU 14 (chain m). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    473a  TRP*     4.1     7.0    -      -       +      -
     18l  LYS*     3.2    19.9    +      -       -      +
     19l  TRP*     3.7    36.2    +      -       +      -
      9m  PRO      3.4     3.6    -      -       -      +
     10m  THR*     3.2    20.4    -      -       +      -
     11m  SER*     3.0    34.4    +      -       -      +
     13m  LYS*     1.3    80.0    -      -       +      +
     15m  GLN*     1.3    58.5    +      -       -      +
     17m  ILE*     3.0    11.0    +      -       +      +
     18m  GLY*     2.9    25.5    +      -       -      -
----------------------------------------------------------
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Residues in contact with GLN 15 (chain m). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    406a  ASN*     5.9     0.7    +      -       -      -
    409a  TRP*     3.1    37.4    +      -       -      +
    470a  PHE*     3.7    20.5    -      -       +      -
    473a  TRP*     4.4     2.9    -      -       -      -
    474a  GLU*     4.6    12.8    -      -       +      +
    607a  PGV      3.7    43.4    -      -       +      +
     10m  THR*     3.1    29.7    -      -       +      +
     11m  SER      3.0    15.9    +      -       -      +
     12m  PRO*     3.7     5.6    -      -       +      +
     14m  GLU*     1.3    75.8    -      -       -      +
     16m  ALA*     1.3    53.8    +      -       -      +
     18m  GLY      3.3     0.8    +      -       -      +
     19m  LEU*     2.8    37.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 16 (chain m). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    607a  PGV      4.5    28.7    -      -       +      +
     12m  PRO      3.1    15.4    +      -       -      +
     13m  LYS*     3.2    11.9    +      -       -      +
     15m  GLN*     1.3    74.3    -      -       -      +
     17m  ILE*     1.3    55.4    +      -       +      +
     19m  LEU*     3.7     3.0    +      -       -      +
     20m  SER*     2.6    36.4    +      -       -      -
----------------------------------------------------------
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Residues in contact with ILE 17 (chain m). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     19l  TRP*     4.1    22.2    -      -       +      -
     22l  LEU*     4.7     0.9    -      -       +      -
     13m  LYS*     3.3    24.0    +      -       +      +
     14m  GLU*     3.0    11.3    +      -       +      +
     16m  ALA*     1.3    75.7    -      -       +      +
     18m  GLY*     1.3    56.6    +      -       -      +
     20m  SER*     3.0     7.2    +      -       -      -
     21m  VAL*     2.7    48.7    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLY 18 (chain m). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    470a  PHE*     3.9     7.0    -      -       -      -
    473a  TRP*     3.8    22.6    -      -       -      -
     19l  TRP*     4.9     0.2    -      -       -      -
     22l  LEU*     4.1    15.2    -      -       -      +
     14m  GLU      2.9    13.1    +      -       -      -
     15m  GLN      3.6     2.9    -      -       -      -
     17m  ILE*     1.3    76.8    -      -       -      +
     19m  LEU*     1.3    60.6    +      -       -      +
     21m  VAL*     4.0     0.3    -      -       -      +
     22m  THR*     3.0    30.9    +      -       -      -
----------------------------------------------------------
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Residues in contact with LEU 19 (chain m). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    409a  TRP*     4.1    14.6    -      -       +      -
    467a  LEU*     3.7    26.0    -      -       +      -
    470a  PHE*     3.8    18.3    -      -       +      -
    607a  PGV      4.5    29.8    -      -       +      -
     88d  PHE*     3.7    22.4    -      -       +      -
     15m  GLN      2.8    19.9    +      -       -      +
     16m  ALA*     4.1     5.6    -      -       -      +
     18m  GLY*     1.3    74.6    -      -       -      +
     20m  SER*     1.3    58.4    +      -       -      +
     22m  THR*     3.8     2.0    -      -       -      -
     23m  PHE*     2.9    68.8    +      -       +      +
----------------------------------------------------------
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Residues in contact with SER 20 (chain m). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    607a  PGV      4.1    27.6    -      -       -      +
     16m  ALA      2.6    22.6    +      -       -      -
     17m  ILE*     3.0     8.6    +      -       -      -
     19m  LEU*     1.3    76.0    -      -       -      +
     21m  VAL*     1.3    66.5    +      -       -      +
     23m  PHE*     3.5     4.2    +      -       -      +
     24m  LEU*     3.1    39.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 21 (chain m). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     22l  LEU*     3.9    25.8    -      -       +      -
     23l  ALA*     6.0     0.7    -      -       -      -
     26l  THR*     3.6    24.0    -      -       +      +
     17m  ILE*     2.7    38.4    +      -       +      +
     18m  GLY      4.0     0.4    -      -       -      +
     20m  SER*     1.3    71.7    -      -       -      +
     22m  THR*     1.3    54.8    -      -       -      +
     24m  LEU*     2.7    31.0    +      -       +      +
     25m  SER*     2.9    14.0    +      -       -      -
----------------------------------------------------------
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Residues in contact with THR 22 (chain m). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    466a  MET      3.5    26.9    -      -       -      +
    469a  VAL*     3.9    23.8    -      -       +      +
    470a  PHE*     3.9    16.9    -      -       +      +
    473a  TRP*     5.4     1.2    -      -       -      +
     22l  LEU*     3.7    15.4    -      -       -      +
     26l  THR*     4.0     6.1    -      -       +      +
     18m  GLY      3.0    19.0    +      -       -      -
     19m  LEU      3.9     2.2    -      -       -      -
     21m  VAL*     1.3    78.6    -      -       -      +
     23m  PHE*     1.3    61.6    +      -       +      +
     25m  SER*     2.8    21.0    +      -       -      +
     26m  PHE*     3.2    16.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with PHE 23 (chain m). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    463a  THR*     4.0    12.3    -      -       +      -
    466a  MET*     3.7    43.1    -      -       +      -
    467a  LEU*     3.7    20.0    -      -       +      -
    470a  PHE*     5.3     0.4    -      -       +      -
    607a  PGV      5.0    11.4    -      -       +      -
     88d  PHE*     4.0    16.4    -      +       -      -
     91d  PHE*     3.5    37.2    -      +       -      -
     19m  LEU*     2.9    59.7    +      -       +      +
     20m  SER*     4.1     4.5    -      -       -      +
     21m  VAL      3.3     0.2    -      -       -      -
     22m  THR*     1.3    78.3    -      -       +      +
     24m  LEU*     1.3    59.3    +      -       +      +
     26m  PHE*     3.6     1.8    +      -       -      +
     27m  LEU*     3.1    41.1    +      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 24 (chain m). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    607a  PGV      5.3    11.9    -      -       +      -
     20m  SER*     3.1    32.2    +      -       -      +
     21m  VAL*     2.7    11.0    +      -       +      +
     23m  PHE*     1.3    76.7    -      -       -      +
     25m  SER*     1.3    58.7    +      -       -      +
     27m  LEU*     4.6     6.7    -      -       +      -
     28m  LEU*     2.8    73.6    +      -       +      +
    401m  DMU      6.2     0.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with SER 25 (chain m). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     26l  THR*     3.2    47.4    -      -       -      +
     30l  GLY*     4.4    13.9    +      -       -      +
     33l  PHE*     5.4     0.3    -      -       -      -
     21m  VAL*     2.9     5.9    +      -       -      -
     22m  THR*     2.8    19.6    +      -       -      -
     24m  LEU*     1.3    73.5    -      -       -      +
     26m  PHE*     1.3    63.5    +      -       -      +
     29m  PRO*     3.2    23.8    -      -       -      +
----------------------------------------------------------
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Residues in contact with PHE 26 (chain m). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     28a  MET*     3.7    26.0    -      -       -      -
    462a  LEU*     4.2     2.7    -      -       +      -
    465a  VAL*     4.5     8.1    -      -       +      -
    466a  MET*     3.6    42.6    -      -       +      -
    469a  VAL*     3.5    37.0    -      -       +      -
     29l  PHE*     4.2    15.0    -      -       +      -
     30l  GLY*     5.3     2.0    -      -       -      -
     33l  PHE*     3.4    64.4    -      +       +      -
     22m  THR*     3.2    24.5    -      -       +      -
     23m  PHE      3.6     1.7    +      -       -      +
     24m  LEU      3.2     0.6    -      -       -      -
     25m  SER*     1.3    85.0    +      -       -      +
     27m  LEU*     1.3    64.3    +      -       +      +
     29m  PRO*     4.2     0.5    -      -       -      +
     30m  ALA*     3.7    10.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 27 (chain m). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    462a  LEU*     4.3     6.5    -      -       +      -
    466a  MET*     3.9    17.9    -      -       +      -
    607a  PGV      6.0     2.0    -      -       +      -
     91d  PHE*     4.3    11.9    -      -       +      -
     95d  LEU*     4.0    31.9    -      -       +      -
     33l  PHE*     6.3     0.2    -      -       +      -
     23m  PHE*     3.1    35.1    +      -       +      +
     24m  LEU*     4.2     6.7    -      -       +      +
     26m  PHE*     1.3    77.9    -      -       -      +
     28m  LEU*     1.3    61.5    +      -       +      +
     30m  ALA*     4.1     1.3    -      -       -      +
     31m  GLY*     3.0    25.8    +      -       -      -
    401m  DMU      3.4    51.7    -      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 28 (chain m). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     24m  LEU*     2.8    56.4    +      -       +      +
     27m  LEU*     1.3    70.5    -      -       +      +
     29m  PRO*     1.4    63.8    -      -       +      +
     31m  GLY*     2.8     5.4    +      -       -      -
     32m  TRP*     2.8    29.1    +      -       -      +
    401m  DMU      3.4    40.3    +      -       +      +
----------------------------------------------------------
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Residues in contact with PRO 29 (chain m). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     30l  GLY      5.5     1.1    -      -       -      +
     33l  PHE*     6.4     0.7    -      -       +      -
     34l  ALA*     4.2    25.6    -      -       +      -
     37l  PHE*     5.5     0.9    -      -       -      -
     38l  PHE*     4.7    10.8    -      -       +      -
     24m  LEU      3.8     1.1    -      -       -      +
     25m  SER*     3.2    26.7    -      -       -      +
     26m  PHE      4.2     1.1    -      -       -      +
     27m  LEU      3.9     0.2    -      -       -      -
     28m  LEU*     1.4    93.4    -      -       +      +
     30m  ALA*     1.3    63.4    +      -       -      +
     32m  TRP*     3.5    14.2    +      -       +      +
     33m  VAL*     3.2    28.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 30 (chain m). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     33l  PHE*     4.0     5.6    -      -       +      -
     37l  PHE*     3.6    42.5    -      -       +      -
     26m  PHE      3.7    17.6    +      -       -      +
     27m  LEU      3.8     2.4    +      -       -      +
     28m  LEU      3.3     0.6    -      -       -      -
     29m  PRO*     1.3    81.4    -      -       -      +
     31m  GLY*     1.3    57.7    +      -       -      +
     33m  VAL*     3.4     1.9    +      -       -      +
     34m  LEU*     2.9    41.0    +      -       +      +
    401m  DMU      4.4     9.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLY 31 (chain m). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     98d  TRP*     3.5    20.9    -      -       -      -
     27m  LEU      3.0    13.6    +      -       -      -
     28m  LEU      2.8     8.3    +      -       -      -
     30m  ALA*     1.3    74.1    -      -       -      +
     32m  TRP*     1.3    54.4    +      -       -      -
     34m  LEU*     4.4     0.4    -      -       -      -
     35m  TYR*     2.7    38.6    +      -       -      +
    401m  DMU      3.9    19.7    -      -       -      +
----------------------------------------------------------
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Residues in contact with TRP 32 (chain m). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     38l  PHE*     4.6    27.4    -      +       -      -
     41l  ARG*     6.2     5.8    -      -       -      -
     28m  LEU      2.8    17.1    +      -       -      +
     29m  PRO*     3.7    10.3    -      -       +      +
     31m  GLY*     1.3    72.3    -      -       -      +
     33m  VAL*     1.3    65.1    +      -       +      +
     36m  HIS*     2.7    63.9    +      +       +      -
     40m  TYR*     4.9     6.3    +      -       -      -
    401m  DMU      3.5    20.8    -      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 33 (chain m). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     37l  PHE*     3.6    39.7    -      -       +      +
     38l  PHE*     3.6    35.0    -      -       +      -
     40l  VAL*     5.8     1.3    -      -       +      -
     41l  ARG*     4.3    17.9    -      -       +      +
     29m  PRO      3.2    13.9    +      -       -      +
     30m  ALA      3.7     6.7    -      -       -      +
     32m  TRP*     1.3    81.0    -      -       +      +
     34m  LEU*     1.3    62.7    +      -       -      +
     36m  HIS      3.4     6.4    +      -       -      -
     37m  LEU*     3.7    15.5    +      -       +      +
     40m  TYR*     3.7    23.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 34 (chain m). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     36a  LEU*     4.9     7.4    -      -       +      -
     39a  ALA*     5.3     6.5    -      -       +      -
     47a  LEU*     5.1     8.5    -      -       +      -
     98d  TRP*     4.4     1.6    -      -       +      -
     99d  GLU*     6.5     0.7    -      -       +      -
    102d  TYR      4.2     1.2    -      -       -      +
    103d  VAL*     3.8    42.7    -      -       +      +
     37l  PHE*     4.2    22.9    -      -       +      -
     30m  ALA      2.9    27.4    +      -       -      +
     31m  GLY*     3.7     4.0    -      -       -      +
     32m  TRP      3.2     0.2    -      -       -      -
     33m  VAL*     1.3    75.9    -      -       -      +
     35m  TYR*     1.3    65.9    +      -       -      +
     37m  LEU*     3.3    31.6    -      -       +      +
    401m  DMU      3.8    35.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with TYR 35 (chain m). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     98d  TRP*     4.3     4.1    -      -       +      -
    102d  TYR*     3.8    40.1    -      +       +      +
     31m  GLY      2.7    22.3    +      -       -      +
     32m  TRP      3.6     4.3    -      -       -      +
     34m  LEU*     1.3    73.3    -      -       -      +
     36m  HIS*     1.3    82.8    +      +       +      +
     37m  LEU      3.0     6.8    +      -       -      -
     38m  ASP*     3.8    11.4    +      -       -      +
     39m  ASN*     5.5     3.1    +      -       -      -
    401m  DMU      3.0    72.0    +      -       -      -
----------------------------------------------------------
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Residues in contact with HIS 36 (chain m). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     32m  TRP*     2.7    52.2    +      +       -      +
     33m  VAL      3.7     2.9    -      -       -      -
     34m  LEU      3.3     0.4    -      -       -      -
     35m  TYR*     1.3    96.6    -      +       -      +
     37m  LEU*     1.3    56.5    +      -       -      +
     38m  ASP      3.7     1.8    -      -       -      -
     39m  ASN*     3.5    31.8    -      -       -      +
     40m  TYR*     3.1    43.3    -      +       +      +
    401m  DMU      3.6    23.4    +      -       -      -
----------------------------------------------------------
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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