Contacts of the helix formed by residues 20 - 45 (chain D) in PDB entry 4J4L


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 THR 20 (chain D).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    102B  TYR*     4.1     9.6    -      -       +      +
    124B  TYR*     3.8    29.4    -      -       +      -
    125B  LEU      5.3     1.6    -      -       -      +
    126B  THR*     4.2     7.9    -      -       -      +
    148B  GLU*     3.3    33.2    +      -       +      +
    150B  GLN*     3.2    26.3    +      -       -      +
    172B  TYR*     4.1    15.8    -      -       -      -
     19D  LEU*     1.3    74.5    -      -       -      +
     21D  SER*     1.3    61.2    +      -       -      +
     23D  GLU*     3.1     4.1    +      -       -      -
     24D  ARG      3.0    22.2    +      -       -      -
----------------------------------------------------------
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Residues in contact with SER 21 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    150B  GLN*     5.4     0.2    -      -       -      +
    172B  TYR*     6.5     0.2    -      -       -      -
     19D  LEU      4.3     7.6    +      -       -      +
     20D  THR*     1.3    77.9    +      -       -      +
     22D  SER*     1.3    65.4    +      -       -      +
     24D  ARG*     3.4     9.6    +      -       -      +
     25D  ILE*     3.3    32.2    +      -       -      +
    129D  LYS*     5.4     7.1    -      -       -      +
----------------------------------------------------------
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Residues in contact with SER 22 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     19D  LEU*     3.5    29.0    +      -       -      +
     20D  THR      3.2     0.4    -      -       -      -
     21D  SER*     1.3    78.3    +      -       -      +
     23D  GLU*     1.3    63.5    +      -       -      +
     25D  ILE*     3.4     9.0    +      -       -      +
     26D  ASP*     2.9    31.2    +      -       -      +
    129D  LYS*     4.8    10.7    +      -       -      +
    181D  LEU      4.7    11.3    +      -       -      -
    184D  MET      5.5     5.2    -      -       -      -
----------------------------------------------------------
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Residues in contact with GLU 23 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     82B  ILE*     4.8     9.6    -      -       -      +
     84B  ASN*     3.5    28.6    +      -       -      +
    102B  TYR*     3.4    21.0    +      -       -      -
    104B  ALA*     3.5    15.4    -      -       -      +
    126B  THR*     3.5    36.8    -      -       +      +
    150B  GLN*     3.8     2.9    -      -       -      +
    152B  TRP*     3.5     4.0    -      -       +      -
     19D  LEU*     3.4     9.4    +      -       -      +
     20D  THR      3.1    11.2    +      -       -      +
     22D  SER*     1.3    80.0    -      -       -      +
     24D  ARG*     1.3    56.0    +      -       -      +
     26D  ASP*     3.5    12.9    +      -       +      +
     27D  LYS*     2.9    29.8    +      -       -      +
     30D  ARG*     4.9     0.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 24 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    150B  GLN*     3.3    14.4    -      -       -      +
    152B  TRP*     3.8    12.3    -      -       +      -
    172B  TYR*     3.2    16.6    +      -       -      -
    174B  ASN*     3.5    17.6    -      -       -      +
    177B  PHE*     5.9     2.1    -      -       -      -
    196B  GLU*     2.8    27.5    +      -       -      -
    198B  ASP*     2.7    34.9    +      -       -      +
    222B  ARG*     4.1    19.8    -      -       -      +
     20D  THR      3.0     8.3    +      -       -      +
     21D  SER*     3.9    11.1    -      -       -      +
     22D  SER      3.2     0.8    -      -       -      -
     23D  GLU*     1.3    77.5    -      -       -      +
     25D  ILE*     1.3    57.8    +      -       -      +
     27D  LYS*     3.4     4.2    +      -       -      +
     28D  GLN*     2.9    28.6    +      -       -      +
    125D  PHE*     3.6    40.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with ILE 25 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     21D  SER*     3.3    18.9    +      -       -      +
     22D  SER*     3.4    10.1    +      -       -      +
     24D  ARG*     1.3    73.1    -      -       +      +
     26D  ASP*     1.3    70.4    +      -       -      +
     28D  GLN*     2.8    19.1    +      -       -      +
     29D  ILE*     2.9    15.2    +      -       +      +
    122D  LEU*     4.1    12.1    -      -       +      -
    125D  PHE*     3.7    32.5    -      -       +      +
    126D  LEU*     4.1    11.7    -      -       +      -
    129D  LYS*     3.8    31.9    -      -       +      +
    181D  LEU*     3.8    33.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with ASP 26 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     84B  ASN*     6.2     0.4    -      -       -      -
     85B  ASN*     3.7     3.9    -      -       -      +
     22D  SER      2.9    19.2    +      -       -      +
     23D  GLU*     3.5    17.3    -      -       -      +
     25D  ILE*     1.3    79.4    -      -       -      +
     27D  LYS*     1.3    63.2    +      -       -      +
     29D  ILE*     3.4     4.0    +      -       -      +
     30D  ARG*     2.6    59.0    +      -       -      +
    178D  LEU*     3.3    15.8    -      -       +      +
    181D  LEU*     6.4     0.9    -      -       -      -
    182D  ARG*     2.9    41.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 27 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    128B  GLU*     2.9    33.5    +      -       -      +
    152B  TRP*     3.5    35.0    -      -       +      +
    154B  ASN*     5.4     6.1    +      -       -      +
    177B  PHE*     3.3    57.4    -      -       +      +
     23D  GLU      2.9    15.3    +      -       -      +
     24D  ARG      3.4     9.9    -      -       -      +
     26D  ASP*     1.3    74.0    +      -       -      +
     28D  GLN*     1.3    57.7    +      -       -      +
     30D  ARG*     3.0    23.4    +      -       +      +
     31D  TYR*     3.0    33.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLN 28 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    177B  PHE*     3.5    26.0    -      -       -      -
    201B  TYR*     3.2    27.3    +      -       -      -
     24D  ARG*     2.9    15.2    +      -       -      +
     25D  ILE*     2.8    10.9    +      -       -      +
     27D  LYS*     1.3    76.0    -      -       -      +
     29D  ILE*     1.3    60.7    +      -       -      +
     31D  TYR*     3.2     6.7    +      -       -      +
     32D  ILE*     3.1    27.4    +      -       +      +
    118D  SER*     3.2    20.2    -      -       -      +
    121D  VAL*     3.5    13.6    -      -       -      +
    122D  LEU*     3.9    23.6    -      -       +      +
    125D  PHE*     3.8    22.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with ILE 29 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     25D  ILE*     2.9    14.1    +      -       +      +
     26D  ASP      3.7     7.6    -      -       -      +
     28D  GLN*     1.3    75.0    -      -       -      +
     30D  ARG*     1.3    63.3    +      -       -      +
     32D  ILE*     3.2    10.3    +      -       -      +
     33D  LEU*     3.1    26.2    +      -       +      +
    122D  LEU*     3.7    26.5    -      -       +      -
    126D  LEU*     6.1     0.2    -      -       +      -
    174D  LEU*     4.1    23.3    -      -       +      +
    177D  SER*     4.3     9.2    -      -       -      -
    178D  LEU*     4.0    43.1    -      -       +      +
    181D  LEU*     3.7    30.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with ARG 30 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     84B  ASN*     4.3     9.1    -      -       -      +
     85B  ASN*     3.1    34.6    +      -       -      +
    128B  GLU*     2.8    40.2    +      -       -      -
    152B  TRP*     4.6     1.6    -      -       -      -
     23D  GLU*     4.9     0.6    +      -       -      +
     26D  ASP*     2.6    34.0    +      -       -      +
     27D  LYS*     3.0    35.2    +      -       +      +
     29D  ILE*     1.3    78.5    -      -       -      +
     31D  TYR*     1.3    59.3    +      -       -      +
     33D  LEU*     3.8    12.2    -      -       +      +
     34D  ASP*     3.3    29.4    +      -       -      +
    178D  LEU*     4.8     9.0    -      -       +      -
    182D  ARG*     4.7     5.6    -      -       -      +
----------------------------------------------------------
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Residues in contact with TYR 31 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    177B  PHE*     3.6    35.7    -      +       +      -
    201B  TYR*     3.7    26.0    -      +       +      +
    225B  GLN*     4.6     3.1    +      -       -      +
     27D  LYS*     3.0    19.6    +      -       -      +
     28D  GLN*     3.6     9.2    -      -       -      +
     29D  ILE      3.2     0.2    -      -       -      -
     30D  ARG*     1.3    76.4    -      -       -      +
     32D  ILE*     1.3    67.5    +      -       -      +
     34D  ASP*     3.4    10.8    +      -       +      +
     35D  GLY*     3.0    18.0    +      -       -      -
    111D  GLN*     5.6     5.7    +      -       -      -
    114D  ALA*     4.6    16.9    -      -       +      +
    118D  SER*     3.6    28.0    -      -       -      -
----------------------------------------------------------
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Residues in contact with ILE 32 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     28D  GLN      3.1    17.6    +      -       -      +
     29D  ILE*     3.2     6.9    +      -       -      +
     31D  TYR*     1.3    76.8    -      -       -      +
     33D  LEU*     1.3    56.4    +      -       -      +
     35D  GLY*     2.9    19.4    +      -       -      -
     36D  ILE*     2.9    14.8    +      -       +      +
    115D  VAL*     4.1    15.7    -      -       +      +
    118D  SER*     3.8    31.9    -      -       -      +
    119D  THR*     3.8    26.5    -      -       +      +
    122D  LEU*     3.7    30.3    -      -       +      -
    170D  PHE*     3.9    11.9    -      -       +      -
    174D  LEU*     3.7    20.6    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 33 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     29D  ILE*     3.1    30.7    +      -       +      +
     30D  ARG*     3.9    13.0    -      -       +      +
     31D  TYR      3.2     0.2    -      -       -      -
     32D  ILE*     1.3    76.3    -      -       -      +
     34D  ASP*     1.3    59.2    +      -       -      +
     36D  ILE*     3.4     7.6    +      -       +      +
     37D  SER*     3.0    28.8    +      -       -      -
    171D  LYS*     4.0    30.1    -      -       +      +
    174D  LEU*     3.7    31.0    -      -       +      -
    175D  GLN*     4.5    17.3    -      -       +      +
    178D  LEU*     4.8    10.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with ASP 34 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     30D  ARG*     3.3    16.3    +      -       -      +
     31D  TYR*     3.8    12.2    -      -       +      +
     32D  ILE      3.4     0.2    -      -       -      -
     33D  LEU*     1.3    74.3    -      -       -      +
     35D  GLY*     1.3    66.7    +      -       -      +
     37D  SER*     3.5     8.4    +      -       -      -
     38D  ALA*     3.1    23.2    +      -       -      +
    111D  GLN*     5.1     0.2    -      -       -      +
----------------------------------------------------------
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Residues in contact with GLY 35 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     31D  TYR*     3.0    10.5    +      -       -      -
     32D  ILE      2.9    12.2    +      -       -      -
     34D  ASP*     1.3    73.8    -      -       -      +
     36D  ILE*     1.3    62.4    -      -       -      +
     38D  ALA*     3.4     4.9    +      -       -      +
     39D  LEU*     3.2    23.6    +      -       -      +
    111D  GLN*     3.2    29.4    -      -       -      +
    115D  VAL*     3.7    10.5    -      -       -      -
----------------------------------------------------------
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Residues in contact with ILE 36 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     32D  ILE*     2.9    17.1    +      -       +      +
     33D  LEU*     3.5    11.7    -      -       +      +
     35D  GLY*     1.3    72.4    -      -       -      +
     37D  SER*     1.3    61.0    +      -       -      +
     39D  LEU*     2.7    32.0    +      -       -      +
     40D  ARG*     2.8    14.9    +      -       +      +
    115D  VAL*     3.9    13.4    -      -       +      +
    167D  LEU*     4.2    32.4    -      -       +      +
    170D  PHE*     3.3    36.8    -      -       +      -
    171D  LYS*     4.0    26.2    -      -       +      +
    174D  LEU*     4.1    12.8    -      -       +      -
----------------------------------------------------------
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Residues in contact with SER 37 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    169A  ASN*     5.8     6.4    +      -       -      -
     33D  LEU      3.0    15.3    +      -       -      -
     34D  ASP*     3.6     9.2    +      -       -      -
     36D  ILE*     1.3    80.3    -      -       -      +
     38D  ALA*     1.3    62.1    +      -       -      +
     40D  ARG*     3.3     9.1    +      -       -      +
     41D  LYS*     3.1    47.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 38 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     34D  ASP      3.1    10.3    +      -       -      +
     35D  GLY      3.6     9.6    -      -       -      +
     37D  SER*     1.3    78.8    +      -       -      +
     39D  LEU*     1.3    61.1    +      -       -      +
     41D  LYS*     3.7    12.8    +      -       -      +
     42D  GLU*     3.4    27.9    +      -       -      +
    111D  GLN*     4.1    19.3    -      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 39 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     35D  GLY      3.2    15.7    +      -       -      +
     36D  ILE*     2.7    14.3    +      -       -      +
     38D  ALA*     1.3    71.4    -      -       -      +
     40D  ARG*     1.3    61.7    +      -       -      +
     42D  GLU*     3.6     1.3    +      -       -      -
     43D  THR*     2.8    30.5    +      -       -      -
    101D  LEU*     4.4    12.3    -      -       +      -
    105D  PHE*     3.4    35.9    -      -       +      -
    108D  SER*     4.5     5.6    -      -       -      +
    111D  GLN*     3.7    22.0    -      -       +      -
    112D  ALA*     3.8    21.3    -      -       -      +
    115D  VAL*     3.9    22.2    -      -       +      -
    167D  LEU*     3.9    24.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with ARG 40 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    147A  LYS*     3.5    30.6    -      -       -      +
    171A  THR*     3.8    24.5    -      -       -      +
    195A  THR*     6.0     2.4    -      -       -      +
     36D  ILE*     2.8    13.9    +      -       +      +
     37D  SER*     3.7    11.3    +      -       -      +
     39D  LEU*     1.3    74.2    -      -       -      +
     41D  LYS*     1.3    76.6    +      -       -      +
     43D  THR*     3.1     4.8    +      -       -      -
     44D  CYS*     2.9    46.7    +      -       -      +
     50D  CYS*     4.1     5.3    -      -       -      +
    164D  HIS*     3.3    43.1    +      -       +      +
    167D  LEU*     3.9    22.6    -      -       +      +
    168D  ARG*     5.5    10.8    -      -       -      +
    171D  LYS*     5.6     6.3    -      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 41 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    193A  ASN*     3.5    29.2    -      -       -      +
    217A  GLN*     3.7    28.7    -      -       -      +
     37D  SER*     3.1    37.2    +      -       -      +
     38D  ALA*     3.8    13.5    -      -       -      +
     40D  ARG*     1.3    84.4    -      -       -      +
     42D  GLU*     1.3    69.3    +      -       -      +
     44D  CYS*     3.2     9.4    +      -       -      +
     45D  ASN*     3.1    32.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 42 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     38D  ALA      3.4    16.3    +      -       -      +
     39D  LEU*     4.3     4.0    -      -       -      +
     40D  ARG      3.3     0.4    -      -       -      -
     41D  LYS*     1.3    90.6    -      -       -      +
     43D  THR*     1.3    61.2    +      -       -      +
     45D  ASN*     3.1    31.9    +      -       -      +
     46D  LYS*     3.9    18.6    +      -       -      +
    105D  PHE*     4.9     9.2    -      -       +      -
    107D  SER*     5.1     8.1    -      -       -      +
    108D  SER*     4.3    19.5    -      -       -      +
----------------------------------------------------------
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Residues in contact with THR 43 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     39D  LEU      2.8    19.9    +      -       -      -
     40D  ARG*     3.8     5.2    -      -       -      -
     42D  GLU*     1.3    76.5    -      -       -      +
     44D  CYS*     1.3    63.7    +      -       -      +
     46D  LYS*     3.3    30.6    +      -       +      +
     47D  SER*     4.5     1.4    +      -       -      -
     49D  MET*     5.2     9.3    -      -       -      +
     50D  CYS*     5.1     0.4    -      -       -      -
    105D  PHE*     2.9    23.4    -      -       -      -
    160D  ASP*     3.9    26.9    -      -       +      +
    163D  THR*     3.8    22.7    -      -       +      +
    164D  HIS*     4.9     9.2    -      -       +      +
    167D  LEU*     5.1     0.9    -      -       -      -
----------------------------------------------------------
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Residues in contact with CYS 44 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    219A  LYS*     4.5    12.8    +      -       -      +
     40D  ARG*     2.9    41.5    +      -       -      -
     41D  LYS*     3.2    10.5    +      -       -      +
     43D  THR*     1.3    71.6    -      -       -      +
     45D  ASN*     1.3    58.8    +      -       -      +
     46D  LYS      2.8    11.3    +      -       -      -
     47D  SER*     3.2    21.7    +      -       -      +
     49D  MET*     4.9     3.3    +      -       -      -
     50D  CYS*     2.0    53.7    +      -       +      +
    164D  HIS*     4.0     3.4    -      -       -      -
----------------------------------------------------------
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Residues in contact with ASN 45 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    217A  GLN*     5.8     1.8    +      -       -      -
    219A  LYS*     3.5    23.7    -      -       -      +
     41D  LYS*     3.1    14.4    +      -       -      +
     42D  GLU*     3.1    30.6    +      -       -      +
     43D  THR      3.4     1.0    -      -       -      -
     44D  CYS*     1.3    73.2    -      -       -      +
     46D  LYS*     1.3    58.7    +      -       -      +
     47D  SER*     3.3     3.1    +      -       -      +
----------------------------------------------------------
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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