Contacts of the helix formed by residues 3 - 31 (chain B) in PDB entry 1CE9


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 VAL 3 (chain B).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      1A  MET*     5.2     6.7    -      -       +      +
      2A  SER*     6.0     0.2    -      -       -      -
      3A  VAL*     5.0    18.6    -      -       +      +
      6A  LEU*     3.8    15.9    -      -       +      -
      1B  MET      4.0     0.4    +      -       -      +
      2B  SER*     1.3    74.1    -      -       -      +
      4B  LYS*     1.3    58.7    +      -       -      +
      6B  LEU*     3.2    10.8    +      -       -      +
      7B  GLU*     2.9    51.0    +      -       -      +
     22D  ASN*     4.2     9.2    -      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 4 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      2B  SER*     3.9     9.6    -      -       -      +
      3B  VAL*     1.3    77.7    -      -       -      +
      5B  GLU*     1.3    65.4    +      -       -      +
      7B  GLU*     3.4    14.4    +      -       -      +
      8B  ASP*     2.8    58.9    +      -       -      +
     22D  ASN*     6.0     3.6    -      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 5 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      1B  MET*     3.9    25.9    +      -       +      +
      2B  SER*     3.2    25.4    +      -       -      +
      4B  LYS*     1.3    81.1    -      -       -      +
      6B  LEU*     1.3    62.8    +      -       -      +
      8B  ASP*     3.5     6.9    +      -       -      +
      9B  LYS*     3.2    24.3    +      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 6 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      3A  VAL*     3.5    44.6    -      -       +      +
      6A  LEU*     3.9    21.1    -      -       +      -
      7A  GLU*     3.9    23.1    -      -       +      +
     10A  VAL*     4.1    11.2    -      -       +      +
      1B  MET*     3.7    24.7    -      -       +      -
      2B  SER      3.4    13.0    +      -       -      +
      3B  VAL*     3.2     9.8    +      -       -      +
      4B  LYS      3.2     0.2    -      -       -      -
      5B  GLU*     1.3    76.3    -      -       +      +
      7B  GLU*     1.3    66.1    +      -       -      +
      9B  LYS*     3.1     7.8    +      -       +      +
     10B  VAL*     3.0    26.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 7 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      1A  MET*     5.2     3.3    -      -       -      +
      6A  LEU*     3.9    18.1    -      -       +      +
      3B  VAL*     2.9    31.3    +      -       -      +
      4B  LYS*     3.4    15.1    +      -       -      +
      6B  LEU*     1.3    75.0    -      -       -      +
      8B  ASP*     1.3    66.3    +      -       -      +
     10B  VAL*     3.3     4.0    +      -       -      +
     11B  GLU*     3.1    29.9    +      -       -      +
     18D  TYR*     3.7    49.0    -      -       +      +
     21D  GLU*     5.2     1.7    -      -       -      +
     22D  ASN*     3.1    33.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASP 8 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      4B  LYS*     2.8    58.9    +      -       -      +
      5B  GLU*     3.8     7.0    -      -       -      +
      6B  LEU      3.2     0.2    -      -       -      -
      7B  GLU*     1.3    78.9    -      -       -      +
      9B  LYS*     1.3    58.3    +      -       -      +
     11B  GLU*     3.5    18.3    +      -       -      +
     12B  GLU*     3.0    27.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 9 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     10A  VAL*     3.7    30.3    -      -       +      -
      5B  GLU*     3.2    15.2    +      -       +      +
      6B  LEU*     3.1    12.7    +      -       +      +
      8B  ASP*     1.3    75.1    -      -       -      +
     10B  VAL*     1.3    61.2    +      -       -      +
     12B  GLU*     2.6    32.1    +      -       -      +
     13B  LEU*     3.0    43.2    +      -       +      +
----------------------------------------------------------
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Residues in contact with VAL 10 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      6A  LEU*     4.1    10.1    -      -       +      +
      9A  LYS*     3.8    20.9    -      -       +      -
     10A  VAL*     3.6    19.3    -      -       +      +
     13A  LEU*     4.0    19.3    -      -       +      +
      6B  LEU      3.0    17.1    +      -       -      +
      7B  GLU      3.5     7.4    -      -       -      +
      9B  LYS*     1.3    75.1    -      -       -      +
     11B  GLU*     1.3    60.3    +      -       -      +
     13B  LEU*     3.1     3.4    +      -       -      +
     14B  LEU*     2.8    29.0    +      -       +      +
     14D  LEU*     4.0    14.1    -      -       +      -
     18D  TYR*     3.3    31.9    -      -       +      +
----------------------------------------------------------
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Residues in contact with GLU 11 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      7B  GLU*     3.1    19.2    +      -       -      +
      8B  ASP*     3.8    15.5    -      -       -      +
     10B  VAL*     1.3    80.5    -      -       -      +
     12B  GLU*     1.3    61.5    +      -       -      +
     14B  LEU*     3.5     6.7    +      -       -      +
     15B  SER*     3.2    24.4    +      -       -      -
     11D  GLU*     5.5     4.2    -      -       -      +
     14D  LEU*     4.7    11.2    -      -       +      -
     15D  SER*     4.0    26.0    +      -       -      +
     18D  TYR*     3.7    26.0    -      -       +      +
----------------------------------------------------------
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Residues in contact with GLU 12 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      8B  ASP      3.0    17.1    +      -       -      +
      9B  LYS*     2.6    41.8    +      -       -      +
     10B  VAL      3.2     0.2    -      -       -      -
     11B  GLU*     1.3    77.6    -      -       -      +
     13B  LEU*     1.3    67.7    -      -       +      +
     15B  SER*     3.6     5.0    +      -       -      -
     16B  LYS*     3.2    21.9    +      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 13 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     10A  VAL*     3.7    42.2    -      -       +      +
     13A  LEU*     4.1    16.6    -      -       +      +
     14A  LEU*     4.2    27.4    -      -       +      +
     17A  ASN*     3.2    23.9    +      -       -      +
      9B  LYS*     3.0    30.9    +      -       +      +
     10B  VAL      3.8     2.9    -      -       -      +
     12B  GLU*     1.3    84.3    -      -       -      +
     14B  LEU*     1.3    60.8    +      -       -      +
     16B  LYS*     3.4     6.7    +      -       +      -
     17B  ASN*     2.8    25.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 14 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     13A  LEU*     4.2    22.8    -      -       +      +
     10B  VAL      2.8    17.5    +      -       -      +
     11B  GLU*     3.9     6.3    -      -       -      +
     13B  LEU*     1.3    73.8    -      -       -      +
     15B  SER*     1.3    64.9    +      -       -      +
     17B  ASN*     3.2     9.7    +      -       -      +
     18B  TYR*     3.1    51.5    +      -       +      +
     10D  VAL*     4.3    11.4    -      -       +      -
     11D  GLU*     3.9    24.2    -      -       +      -
     14D  LEU*     3.7    27.6    -      -       +      -
----------------------------------------------------------
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Residues in contact with SER 15 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     11B  GLU      3.2    15.3    +      -       -      -
     12B  GLU*     3.9     5.6    -      -       -      -
     14B  LEU*     1.3    78.8    -      -       -      +
     16B  LYS*     1.3    62.3    +      -       -      +
     18B  TYR*     3.4     2.9    +      -       -      +
     19B  HIS*     3.1    44.9    +      -       -      -
     11D  GLU*     3.6    26.1    +      -       -      -
----------------------------------------------------------
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Residues in contact with LYS 16 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     17A  ASN*     3.4    19.5    -      -       +      +
     21A  GLU*     4.3    18.7    +      -       -      -
     12B  GLU*     3.2    14.2    +      -       +      +
     13B  LEU*     3.5    13.0    -      -       +      +
     15B  SER*     1.3    80.0    -      -       -      +
     17B  ASN*     1.3    61.2    +      -       -      +
     19B  HIS*     3.4    12.4    +      -       -      +
     20B  LEU*     3.2    36.8    +      -       +      +
----------------------------------------------------------
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Residues in contact with ASN 17 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     13A  LEU*     4.6    11.2    -      -       +      +
     16A  LYS*     4.1    16.1    -      -       -      +
     17A  ASN*     2.8    28.5    +      -       -      +
     20A  LEU*     3.4    15.9    -      -       -      +
     13B  LEU      2.8    12.1    +      -       -      +
     14B  LEU*     3.3    19.2    +      -       -      +
     16B  LYS*     1.3    77.1    -      -       -      +
     18B  TYR*     1.3    76.7    +      -       -      +
     20B  LEU*     3.1     5.8    +      -       -      +
     21B  GLU*     2.9    40.7    +      -       -      +
      1C  MET*     4.9     3.0    -      -       -      +
----------------------------------------------------------
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Residues in contact with TYR 18 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     14B  LEU*     3.1    33.6    +      -       +      +
     15B  SER      3.8     4.9    -      -       -      +
     16B  LYS      3.4     0.2    -      -       -      -
     17B  ASN*     1.3    87.2    -      -       -      +
     19B  HIS*     1.3    65.6    +      -       +      +
     21B  GLU*     3.2     3.6    +      -       +      +
     22B  ASN*     3.0    32.5    +      -       -      +
      1C  MET*     3.8    30.7    -      -       +      +
      6C  LEU*     4.0    14.9    -      -       +      +
      9C  LYS*     4.5     8.7    -      -       -      +
      7D  GLU*     3.9    39.3    -      -       +      +
     10D  VAL*     3.2    38.1    -      -       +      +
     11D  GLU*     3.2    23.6    -      -       +      +
----------------------------------------------------------
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Residues in contact with HIS 19 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     15B  SER*     3.1    41.0    +      -       -      +
     16B  LYS*     3.7    13.2    -      -       -      +
     17B  ASN      3.3     0.2    -      -       -      -
     18B  TYR*     1.3    76.7    -      -       +      +
     20B  LEU*     1.3    62.8    +      -       +      +
     22B  ASN*     3.6    13.4    +      -       -      +
     23B  GLU*     3.3    21.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 20 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     17A  ASN*     3.7    39.7    -      -       +      +
     20A  LEU*     3.6    18.6    -      -       +      +
     21A  GLU*     3.9    30.5    -      -       +      +
     24A  VAL*     4.7     7.8    -      -       +      +
     16B  LYS*     3.2    30.9    +      -       +      +
     17B  ASN      3.1     7.1    +      -       -      +
     19B  HIS*     1.3    77.6    -      -       +      +
     21B  GLU*     1.3    63.7    +      -       -      +
     22B  ASN      3.2     0.4    -      -       -      -
     23B  GLU*     3.2    21.2    +      -       -      +
     24B  VAL*     3.0    28.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 21 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     20A  LEU*     3.9    27.1    -      -       +      +
     17B  ASN*     2.9    27.5    +      -       -      +
     18B  TYR*     3.2    12.5    +      -       +      +
     20B  LEU*     1.3    76.0    -      -       -      +
     22B  ASN*     1.3    64.2    +      -       -      +
     24B  VAL*     4.1     5.7    -      -       -      +
     25B  ALA*     3.1    24.9    +      -       -      +
      1C  MET*     3.4    56.0    +      -       +      +
      7D  GLU*     4.8     0.2    -      -       -      +
----------------------------------------------------------
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Residues in contact with ASN 22 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     18B  TYR*     3.0    15.2    +      -       -      +
     19B  HIS*     3.7    14.7    +      -       -      +
     21B  GLU*     1.3    77.2    -      -       -      +
     23B  GLU*     1.3    63.6    +      -       -      +
     25B  ALA*     3.5     6.9    +      -       -      +
     26B  ARG*     3.2    37.8    +      -       -      +
      1C  MET*     5.5     1.0    +      -       -      +
      3D  VAL*     3.8    10.6    -      -       -      +
      4D  LYS*     5.7     2.8    -      -       -      +
      7D  GLU*     2.8    38.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 23 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     24A  VAL*     3.7    29.4    -      -       +      +
     28A  LYS*     3.9    15.8    +      -       -      -
     19B  HIS      3.3    10.4    +      -       -      +
     20B  LEU*     3.2    28.3    +      -       -      +
     22B  ASN*     1.3    80.2    -      -       -      +
     24B  VAL*     1.3    57.5    +      -       -      +
     26B  ARG*     3.3    25.0    +      -       -      +
     27B  LEU*     3.0    35.7    +      -       +      +
----------------------------------------------------------
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Residues in contact with VAL 24 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     20A  LEU*     3.8    22.9    -      -       +      +
     23A  GLU*     4.1    16.8    -      -       +      +
     24A  VAL*     3.5    25.1    -      -       +      +
     27A  LEU*     3.7    21.1    -      -       +      +
     20B  LEU      3.0    21.3    +      -       -      +
     21B  GLU*     4.1     7.4    -      -       -      +
     23B  GLU*     1.3    73.2    -      -       -      +
     25B  ALA*     1.3    66.3    +      -       -      +
     27B  LEU*     4.5     1.1    -      -       -      -
     28B  LYS*     3.0    39.5    +      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 25 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     21B  GLU      3.1    19.0    +      -       -      +
     22B  ASN*     3.8     7.6    -      -       -      +
     24B  VAL*     1.3    77.7    -      -       -      +
     26B  ARG*     1.3    61.6    +      -       -      +
     28B  LYS*     3.7     9.3    +      -       -      +
     29B  LYS*     3.4    33.8    +      -       -      +
      1C  MET      5.0     8.3    -      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 26 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     22B  ASN*     3.2    37.8    +      -       -      +
     23B  GLU*     3.5    28.4    -      -       -      +
     24B  VAL      3.1     0.2    -      -       -      -
     25B  ALA*     1.3    74.6    -      -       -      +
     27B  LEU*     1.3    63.8    -      -       +      +
     28B  LYS      3.1     2.0    -      -       -      -
     29B  LYS*     3.2    24.6    +      -       +      +
     30B  LEU*     3.3    12.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 27 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     24A  VAL*     3.9    25.4    -      -       +      +
     27A  LEU*     3.9    24.2    -      -       +      -
     28A  LYS*     3.9    33.9    -      -       +      -
     31A  VAL*     4.9     8.3    -      -       +      -
     34A  ARG*     4.4    20.0    -      -       -      +
     23B  GLU*     3.0    26.1    +      -       +      +
     24B  VAL      3.4     0.2    +      -       -      -
     26B  ARG*     1.3    77.8    -      -       +      +
     28B  LYS*     1.3    57.0    +      -       -      +
     30B  LEU*     3.3    19.4    +      -       +      +
     31B  VAL*     3.0    35.4    +      -       +      +
----------------------------------------------------------
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Residues in contact with LYS 28 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     23A  GLU*     4.7     5.5    +      -       -      -
     26A  ARG*     4.4     7.7    -      -       -      +
     27A  LEU*     3.9     8.5    -      -       +      -
     24B  VAL*     3.0    36.8    +      -       +      +
     25B  ALA*     3.7     9.2    -      -       -      +
     26B  ARG      3.1     0.2    -      -       -      -
     27B  LEU*     1.3    76.1    -      -       -      +
     29B  LYS*     1.3    60.1    +      -       +      +
     31B  VAL*     3.3     6.7    -      -       -      +
     32B  GLY      3.0     8.7    +      -       -      -
     33B  GLU*     2.9    70.0    +      -       +      +
     34B  ARG      4.2    16.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 29 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     25B  ALA*     3.4    22.9    +      -       -      +
     26B  ARG*     3.2    14.4    +      -       +      +
     28B  LYS*     1.3    77.7    -      -       +      +
     30B  LEU*     1.3    61.8    +      -       -      +
     31B  VAL      3.7     0.2    +      -       -      -
     32B  GLY*     3.7     7.9    +      -       -      -
     33B  GLU      4.5     3.8    -      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 30 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     31A  VAL*     3.6    34.5    -      -       +      -
     34A  ARG*     5.1     5.4    -      -       -      +
     26B  ARG      3.3     9.2    +      -       -      +
     27B  LEU*     3.4    24.7    -      -       +      +
     28B  LYS      3.1     0.2    -      -       -      -
     29B  LYS*     1.3    82.5    -      -       -      +
     31B  VAL*     1.3    59.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 31 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     27A  LEU*     3.7    32.5    -      -       +      +
     30A  LEU*     4.3    19.7    -      -       +      -
     31A  VAL*     3.4    25.6    -      -       +      -
     27B  LEU      3.0    15.7    +      -       -      +
     28B  LYS      3.3    11.2    -      -       -      +
     30B  LEU*     1.3    76.8    -      -       -      +
     32B  GLY*     1.3    60.9    +      -       -      +
     33B  GLU*     3.5    24.5    -      -       +      +
----------------------------------------------------------
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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