Contacts of the helix formed by residues 5 - 34 (chain B) in PDB entry 2L6W


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 PRO 5 (chain B).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      3B  SER      3.9     1.8    -      -       -      +
      4B  LEU*     1.3    95.8    -      -       +      +
      6B  PHE*     1.3    60.5    +      -       +      +
      7B  LYS*     3.1    18.6    -      -       +      +
      8B  VAL*     3.1    46.0    -      -       +      +
      9B  VAL*     3.7     3.6    -      -       -      +
----------------------------------------------------------
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Residues in contact with PHE 6 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      1A  GLY*     4.9    24.0    -      -       -      +
      2A  HIS*     5.0    11.9    -      -       +      -
      4A  LEU      5.7     3.6    -      -       -      -
      6A  PHE*     4.9    17.7    -      -       +      -
      9A  VAL*     5.7     5.8    -      -       +      -
      1B  GLY*     6.2     2.7    -      -       -      -
      4B  LEU      3.8     0.6    +      -       -      -
      5B  PRO*     1.3    74.1    -      -       +      +
      7B  LYS*     1.3    79.0    +      -       +      +
      8B  VAL      3.4     0.2    -      -       -      -
      9B  VAL*     3.2    16.3    +      -       +      +
     10B  VAL*     3.2    36.5    +      -       +      +
----------------------------------------------------------
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Residues in contact with LYS 7 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      5B  PRO*     3.1    14.8    -      -       +      -
      6B  PHE*     1.3    94.9    -      -       +      +
      8B  VAL*     1.3    65.8    +      -       +      +
      9B  VAL      3.2     0.3    +      -       -      -
     10B  VAL*     3.3     7.3    +      -       +      +
     11B  ILE*     3.1    48.8    +      -       +      +
----------------------------------------------------------
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Residues in contact with VAL 8 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      4B  LEU*     4.3    21.1    -      -       +      -
      5B  PRO*     3.1    35.4    -      -       +      +
      7B  LYS*     1.3    78.7    -      -       +      +
      9B  VAL*     1.3    66.1    +      -       +      +
     11B  ILE*     4.1     8.5    -      -       +      +
     12B  SER*     2.9    33.1    +      -       -      -
----------------------------------------------------------
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Residues in contact with VAL 9 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      6A  PHE*     6.1     1.3    -      -       +      -
      9A  VAL*     3.5    33.9    -      -       +      +
     10A  VAL*     3.5    27.4    -      -       +      +
     13A  ALA*     3.7     9.9    -      -       +      +
     14A  ILE*     6.5     0.2    -      -       +      -
      1B  GLY*     5.7     6.1    -      -       -      -
      4B  LEU*     5.7     0.9    -      -       +      +
      5B  PRO      3.7    13.9    -      -       -      +
      6B  PHE*     3.4    17.9    -      -       +      +
      8B  VAL*     1.3    80.7    -      -       +      +
     10B  VAL*     1.3    60.7    +      -       -      +
     12B  SER*     3.3     5.9    +      -       -      -
     13B  ALA*     2.9    30.5    +      -       -      +
----------------------------------------------------------
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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
----------------------------------------------------------
      9A  VAL*     3.5    23.6    -      -       +      -
      6B  PHE*     3.2    30.7    +      -       +      +
      7B  LYS*     3.3     7.8    +      -       +      +
      9B  VAL*     1.3    75.4    -      -       -      +
     11B  ILE*     1.3    65.4    +      -       +      +
     13B  ALA*     3.1     5.2    +      -       +      +
     14B  ILE*     3.0    30.5    +      -       +      +
----------------------------------------------------------
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Residues in contact with ILE 11 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      7B  LYS*     3.1    41.1    +      -       +      +
      8B  VAL*     4.1     7.4    -      -       +      +
     10B  VAL*     1.3    77.9    -      -       +      +
     12B  SER*     1.3    57.1    +      -       -      +
     14B  ILE*     3.1     9.9    -      -       +      +
     15B  LEU*     3.0    40.6    +      -       +      +
----------------------------------------------------------
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Residues in contact with SER 12 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     13A  ALA*     4.7    10.1    +      -       -      +
     17A  LEU*     5.4    10.4    -      -       -      +
      8B  VAL      2.9    20.6    +      -       -      -
      9B  VAL*     3.6     6.1    -      -       -      -
     11B  ILE*     1.3    74.6    -      -       -      +
     13B  ALA*     1.3    59.8    +      -       -      +
     15B  LEU*     3.9     6.8    -      -       -      +
     16B  ALA*     2.9    30.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 13 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      9A  VAL*     4.5     4.9    -      -       +      +
     12A  SER*     4.3    12.1    -      -       -      +
     13A  ALA*     3.7    30.2    -      -       +      +
     16A  ALA*     4.9     0.2    -      -       -      -
      9B  VAL      2.9    16.2    +      -       -      +
     10B  VAL*     3.5     7.0    -      -       -      +
     12B  SER*     1.3    74.9    -      -       -      +
     14B  ILE*     1.3    67.2    +      -       -      +
     16B  ALA*     3.0    12.8    +      -       -      +
     17B  LEU*     3.1    22.5    +      -       +      +
----------------------------------------------------------
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Residues in contact with ILE 14 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     10B  VAL*     3.0    19.0    +      -       +      +
     11B  ILE*     3.1    22.2    -      -       +      +
     13B  ALA*     1.3    76.6    -      -       -      +
     15B  LEU*     1.3    66.4    +      -       +      +
     17B  LEU*     3.4     9.7    +      -       +      +
     18B  VAL*     3.1    36.8    +      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 15 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     11B  ILE*     3.0    25.0    +      -       +      +
     12B  SER*     3.9     7.0    -      -       -      +
     14B  ILE*     1.3    80.8    -      -       +      +
     16B  ALA*     1.3    64.7    +      -       -      +
     18B  VAL*     3.3    11.8    +      -       +      +
     19B  VAL*     3.1    40.0    +      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 16 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     13A  ALA      4.9     1.3    -      -       -      +
     16A  ALA*     3.3    39.6    -      -       +      +
     17A  LEU*     4.4     8.5    -      -       +      +
     20A  LEU*     4.5     2.1    -      -       +      +
     12B  SER*     2.9    20.0    +      -       -      +
     13B  ALA*     3.0     2.2    +      -       -      +
     15B  LEU*     1.3    77.4    -      -       -      +
     17B  LEU*     1.3    56.7    +      -       -      +
     19B  VAL*     3.0    11.8    -      -       +      +
     20B  LEU*     3.0    29.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 17 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     12A  SER*     5.0     8.7    -      -       -      +
     16A  ALA*     3.5    23.3    -      -       +      -
     19A  VAL*     6.3     0.2    -      -       +      -
     13B  ALA*     3.1    27.0    +      -       -      +
     14B  ILE*     3.7    14.6    -      -       +      +
     15B  LEU      3.3     0.2    -      -       -      -
     16B  ALA*     1.3    74.1    -      -       -      +
     18B  VAL*     1.3    65.6    +      -       +      +
     20B  LEU*     3.6    19.8    +      -       +      +
     21B  THR*     3.4    23.6    +      -       -      -
----------------------------------------------------------
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Residues in contact with VAL 18 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     14B  ILE*     3.1    28.4    +      -       +      +
     15B  LEU*     3.6    15.9    -      -       +      +
     16B  ALA      3.3     0.2    -      -       -      -
     17B  LEU*     1.3    78.9    -      -       +      +
     19B  VAL*     1.3    64.7    +      -       +      +
     21B  THR*     3.5     7.0    +      -       -      -
     22B  ILE*     3.2    33.4    +      -       +      +
----------------------------------------------------------
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Residues in contact with VAL 19 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     20A  LEU*     3.6    22.4    -      -       +      -
     15B  LEU*     3.1    31.3    +      -       +      +
     16B  ALA*     3.0    23.3    -      -       -      +
     18B  VAL*     1.3    74.7    -      -       +      +
     20B  LEU*     1.3    59.6    +      -       -      +
     22B  ILE*     3.0    17.4    +      -       +      +
     23B  ILE*     2.8    37.0    +      -       +      +
----------------------------------------------------------
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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
----------------------------------------------------------
     19A  VAL*     3.7    40.6    -      -       +      +
     20A  LEU*     3.7     9.9    -      -       +      -
     23A  ILE*     3.5    41.4    -      -       +      +
     16B  ALA      3.0    19.1    +      -       -      +
     17B  LEU*     3.7    23.1    -      -       +      +
     18B  VAL      3.3     0.2    -      -       -      -
     19B  VAL*     1.3    78.2    -      -       -      +
     21B  THR*     1.3    62.0    +      -       -      +
     23B  ILE*     3.4     0.7    +      -       -      +
     24B  SER*     3.3    17.3    +      -       -      -
----------------------------------------------------------
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Residues in contact with THR 21 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     17B  LEU      3.4    11.4    +      -       -      -
     18B  VAL*     3.5     9.7    +      -       -      -
     19B  VAL      3.2     0.4    -      -       -      -
     20B  LEU*     1.3    75.7    -      -       -      +
     22B  ILE*     1.3    61.0    +      -       +      +
     24B  SER*     3.2     8.6    +      -       -      -
     25B  LEU*     2.9    51.0    +      -       +      +
----------------------------------------------------------
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Residues in contact with ILE 22 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     18B  VAL*     3.2    29.2    -      -       +      +
     19B  VAL*     3.0    19.2    +      -       +      +
     21B  THR*     1.3    76.2    -      -       +      +
     23B  ILE*     1.3    67.8    +      -       +      +
     25B  LEU*     3.1    16.3    +      -       +      +
     26B  ILE*     3.1    36.8    +      -       +      +
----------------------------------------------------------
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Residues in contact with ILE 23 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     20A  LEU*     3.6    28.7    -      -       +      -
     23A  ILE*     3.4    27.6    -      -       +      +
     24A  SER*     4.5     4.7    -      -       -      +
     27A  ILE*     3.5    25.2    -      -       +      +
     19B  VAL*     2.8    22.1    +      -       +      +
     20B  LEU      3.6     7.4    -      -       -      +
     21B  THR      3.3     0.2    -      -       -      -
     22B  ILE*     1.3    79.1    -      -       +      +
     24B  SER*     1.3    58.6    +      -       -      +
     26B  ILE*     3.5    21.8    +      -       +      +
     27B  ILE*     3.1    18.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with SER 24 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     23A  ILE*     3.6    19.7    -      -       -      +
     20B  LEU      3.3     4.7    +      -       -      -
     21B  THR*     3.2    12.3    +      -       -      -
     22B  ILE      3.2     0.2    -      -       -      -
     23B  ILE*     1.3    79.1    -      -       -      +
     25B  LEU*     1.3    65.2    +      -       -      +
     27B  ILE*     3.3    11.3    +      -       -      +
     28B  LEU*     3.1    23.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 25 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     21B  THR*     2.9    37.0    +      -       +      +
     22B  ILE*     3.1    19.7    +      -       +      +
     24B  SER*     1.3    78.3    -      -       -      +
     26B  ILE*     1.3    63.3    +      -       +      +
     28B  LEU*     3.4    17.6    +      -       +      +
     29B  ILE*     3.1    38.7    +      -       +      +
----------------------------------------------------------
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Residues in contact with ILE 26 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     27A  ILE*     5.7     6.5    -      -       +      -
     22B  ILE*     3.1    28.6    +      -       +      +
     23B  ILE*     3.7    21.8    -      -       +      +
     24B  SER      3.2     0.2    -      -       -      -
     25B  LEU*     1.3    78.5    -      -       +      +
     27B  ILE*     1.3    59.2    +      -       +      +
     29B  ILE*     4.2     4.0    -      -       -      +
     30B  MET*     2.9    41.6    +      -       +      +
----------------------------------------------------------
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Residues in contact with ILE 27 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     23A  ILE*     4.2    14.4    -      -       +      +
     26A  ILE*     5.8     4.0    -      -       +      -
     27A  ILE*     3.4    37.9    -      -       +      -
     30A  MET*     4.0    34.3    -      -       +      -
     23B  ILE      3.1    17.5    -      -       -      +
     24B  SER*     3.3    13.6    +      -       -      +
     26B  ILE*     1.3    74.7    -      -       +      +
     28B  LEU*     1.3    65.6    +      -       -      +
     30B  MET*     3.6    11.7    -      -       +      +
     31B  LEU*     3.0    28.5    +      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 28 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     24B  SER*     3.1    16.6    +      -       -      +
     25B  LEU*     3.6    20.6    -      -       +      +
     26B  ILE      3.3     0.2    -      -       -      -
     27B  ILE*     1.3    78.2    -      -       -      +
     29B  ILE*     1.3    62.6    +      -       +      +
     31B  LEU*     3.8     4.1    -      -       +      +
     32B  TRP*     2.9    31.0    +      -       +      +
----------------------------------------------------------
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Residues in contact with ILE 29 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     25B  LEU*     3.1    24.5    +      -       +      +
     26B  ILE*     4.3     3.8    -      -       -      +
     28B  LEU*     1.3    79.3    -      -       +      +
     30B  MET*     1.3    65.8    +      -       -      +
     32B  TRP*     3.1    23.2    +      -       +      +
     33B  GLN*     3.1    38.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with MET 30 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     27A  ILE*     4.6    17.0    -      -       +      -
     30A  MET*     4.3    16.4    -      -       +      -
     31A  LEU*     5.1    21.1    -      -       +      -
     34A  LYS*     5.7     5.8    -      -       +      -
     26B  ILE*     2.9    29.3    +      -       +      +
     27B  ILE*     3.6    26.9    -      -       +      +
     29B  ILE*     1.3    77.2    -      -       -      +
     31B  LEU*     1.3    58.7    +      -       +      +
     33B  GLN*     3.6     3.4    +      -       -      +
     34B  LYS*     2.9    33.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 31 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     30A  MET*     5.7     9.4    -      -       +      -
     34A  LYS*     5.0    18.4    -      -       -      +
     27B  ILE*     3.0    21.3    +      -       +      +
     28B  LEU*     4.0     4.0    -      -       +      +
     30B  MET*     1.3    77.7    -      -       +      +
     32B  TRP*     1.3    65.8    +      -       -      +
     33B  GLN      3.2     0.2    -      -       -      -
     34B  LYS*     3.4    25.8    +      -       +      +
----------------------------------------------------------
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Residues in contact with TRP 32 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     28B  LEU*     2.9    21.6    +      -       +      +
     29B  ILE*     3.1    19.0    +      -       +      +
     31B  LEU*     1.3    78.6    -      -       -      +
     33B  GLN*     1.3    90.4    +      -       +      +
     34B  LYS*     4.8     2.8    -      -       -      +
----------------------------------------------------------
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Residues in contact with GLN 33 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     29B  ILE*     3.1    23.6    +      -       -      +
     30B  MET*     4.4     3.0    -      -       -      +
     32B  TRP*     1.3   106.6    -      -       +      +
     34B  LYS*     1.3    62.0    -      -       -      +
     35B  LYS*     2.6    31.9    +      -       -      +
     36B  PRO*     5.5     0.6    -      -       -      +
     37B  ARG*     3.3    35.3    +      -       +      +
----------------------------------------------------------
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Residues in contact with LYS 34 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     30B  MET*     2.9    23.8    +      -       -      +
     31B  LEU*     3.4    23.4    +      -       +      +
     32B  TRP      4.8     2.9    -      -       -      +
     33B  GLN*     1.3    77.7    -      -       -      +
     35B  LYS*     1.3    75.2    +      -       +      +
     36B  PRO*     3.7     3.3    -      -       -      +
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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
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  Atomic class           I  II  III   IV   V   VI  VII  VIII
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   I  (Hydrophilic)      +   +    +    -   +   +    +    +
  II  (Acceptor)         +   -    +    -   +   +    +    -
 III  (Donor)            +   +    -    -   +   +    -    +
  IV  (Hydrophobic)      -   -    -    +   +   +    +    +
   V  (Aromatic)         +   +    +    +   +   +    +    +
  VI  (Neutral)          +   +    +    +   +   +    +    +
 VII  (Neutral-donor)    +   +    -    +   +   +    -    +
VIII  (Neutral-acceptor) +   -    +    +   +   +    +    -
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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