Contacts of the helix formed by residues 41 - 67 (chain D) in PDB entry 1R5I


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 41 (chain D).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     36D  SER*     3.9    13.6    +      -       -      -
     38D  LYS*     2.9    17.8    +      -       +      +
     39D  GLU      3.0     1.4    -      -       -      -
     40D  GLU*     1.3    91.4    -      -       +      +
     42D  LYS*     1.3    65.6    +      -       -      +
     43D  GLU      3.3     2.7    -      -       -      -
     44D  VAL*     3.2    10.1    -      -       -      +
     45D  LEU*     3.0    23.5    +      -       -      +
     94D  ALA      4.7     2.2    -      -       -      -
     95D  ASN*     2.9    58.6    +      -       +      +
     97D  VAL*     4.1    12.8    -      -       +      -
    100D  ILE*     6.1     0.4    -      -       -      -
----------------------------------------------------------
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Residues in contact with LYS 42 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     36D  SER      5.8     3.8    -      -       -      +
     37D  ASN      5.7     2.0    -      -       -      +
     38D  LYS      3.7     7.4    +      -       -      +
     39D  GLU*     3.0    23.0    +      -       +      +
     40D  GLU      3.5     0.2    -      -       -      -
     41D  THR*     1.3    78.9    +      -       -      +
     43D  GLU*     1.3    62.2    +      -       -      +
     45D  LEU*     3.5    10.3    +      -       +      +
     46D  LYS*     3.4    30.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 43 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     39D  GLU      4.8     0.4    +      -       -      -
     40D  GLU      4.4    13.9    +      -       -      +
     42D  LYS*     1.3    76.9    -      -       -      +
     44D  VAL*     1.3    77.7    +      -       +      +
     46D  LYS*     3.3    13.6    +      -       -      +
     47D  LEU*     2.8    25.9    -      -       +      +
     97D  VAL*     6.0     1.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with VAL 44 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     36D  SER*     6.5     0.2    -      -       -      -
     41D  THR*     3.2    18.8    +      -       -      +
     43D  GLU*     1.3    84.1    -      -       +      +
     45D  LEU*     1.3    65.7    +      -       -      +
     47D  LEU*     3.0    13.7    +      -       +      +
     48D  PHE*     2.9    26.3    +      -       -      +
     97D  VAL*     4.1    22.4    -      -       +      +
    100D  ILE*     3.3    40.2    -      -       +      -
    101D  LYS*     3.6    32.5    -      -       +      +
    104D  ILE*     4.5     5.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 45 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     33D  TYR*     4.0    23.8    -      -       +      +
     36D  SER*     3.6    36.6    -      -       -      +
     41D  THR      3.0    14.3    +      -       -      +
     42D  LYS*     3.6    11.7    -      -       +      +
     43D  GLU      3.3     0.2    -      -       -      -
     44D  VAL*     1.3    84.4    -      -       +      +
     46D  LYS*     1.3    65.6    +      -       +      +
     48D  PHE*     3.4    12.7    +      -       +      +
     49D  LYS*     3.1    55.6    +      -       +      +
     90D  GLN*     5.3     0.2    -      -       -      +
    100D  ILE*     5.2     1.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with LYS 46 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     42D  LYS*     3.4    20.4    -      -       -      +
     43D  GLU*     3.4    10.5    -      -       -      +
     44D  VAL      3.0     0.4    -      -       -      -
     45D  LEU*     1.3    80.4    -      -       +      +
     47D  LEU*     1.3    70.8    +      -       +      +
     49D  LYS*     3.2     8.0    +      -       -      +
     50D  LEU*     3.0    31.2    +      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 47 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     43D  GLU*     2.8    30.3    -      -       +      +
     44D  VAL*     3.0    12.1    +      -       +      +
     46D  LYS*     1.3    80.3    -      -       +      +
     48D  PHE*     1.3    62.0    +      -       -      +
     50D  LEU*     3.4    12.8    +      -       +      +
     51D  LYS*     3.0    24.4    +      -       -      +
    101D  LYS*     6.3     1.1    -      -       +      -
    104D  ILE*     3.7    17.9    -      -       +      +
----------------------------------------------------------
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Residues in contact with PHE 48 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     32D  ILE*     4.9     1.3    -      -       +      -
     33D  TYR*     3.7    33.9    -      +       -      -
     44D  VAL      2.9    12.1    +      -       -      +
     45D  LEU*     3.5    16.2    -      -       +      +
     46D  LYS      3.1     0.2    -      -       -      -
     47D  LEU*     1.3    74.9    -      -       -      +
     49D  LYS*     1.3    64.4    +      -       -      +
     51D  LYS*     3.0     5.0    +      -       -      +
     52D  VAL*     2.9    33.6    +      -       +      +
     86D  VAL*     5.3     2.5    -      -       +      -
     87D  PHE*     3.7    26.9    -      +       -      -
     90D  GLN*     3.4    44.2    -      -       +      -
    100D  ILE*     4.0    16.4    -      -       +      -
    103D  ASN*     4.4    12.1    -      -       +      -
    104D  ILE*     3.6    21.9    -      -       +      +
    107D  LEU*     4.6    12.6    -      -       +      -
----------------------------------------------------------
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Residues in contact with LYS 49 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     30D  GLU*     4.6     8.3    +      -       -      -
     33D  TYR*     3.3    59.5    -      -       +      +
     45D  LEU*     3.1    38.6    +      -       +      +
     46D  LYS*     3.2     8.7    +      -       -      +
     48D  PHE*     1.3    77.3    -      -       -      +
     50D  LEU*     1.3    67.7    +      -       +      +
     52D  VAL*     3.2     1.4    +      -       -      +
     53D  ASN*     3.0    33.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 50 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     46D  LYS*     3.0    16.8    +      -       +      +
     47D  LEU*     3.6    15.9    -      -       +      +
     49D  LYS*     1.3    79.8    -      -       +      +
     51D  LYS*     1.3    57.8    +      -       -      +
     53D  ASN*     3.3    14.4    +      -       +      +
     54D  GLN*     2.9    28.3    +      -       -      +
     57D  ARG*     4.3     5.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 51 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     47D  LEU      3.0    12.6    +      -       -      +
     48D  PHE*     3.0     9.2    +      -       -      +
     50D  LEU*     1.3    75.4    -      -       -      +
     52D  VAL*     1.3    60.1    +      -       -      +
     54D  GLN*     3.0    31.2    +      -       -      +
     55D  PHE*     2.7    30.0    +      -       -      +
    104D  ILE*     3.4    32.4    -      -       +      +
    107D  LEU*     4.1    15.9    -      -       +      -
    108D  ASP*     2.8    41.1    +      -       -      -
    111D  MET*     3.3    15.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with VAL 52 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     29D  LEU*     3.8    26.7    -      -       +      -
     33D  TYR*     3.3    28.5    -      -       +      +
     48D  PHE*     2.9    43.0    +      -       +      +
     49D  LYS      3.2     2.0    +      -       -      +
     51D  LYS*     1.3    75.3    -      -       -      +
     53D  ASN*     1.3    66.2    +      -       -      +
     55D  PHE*     3.0    10.5    +      -       +      +
     56D  TYR*     2.9    35.0    +      -       +      -
     83D  LEU*     5.1     3.6    -      -       +      -
     87D  PHE*     4.4    11.7    -      -       +      -
    107D  LEU*     4.4    10.8    -      -       +      -
----------------------------------------------------------
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Residues in contact with ASN 53 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     29D  LEU*     5.5     3.6    -      -       -      +
     33D  TYR*     4.6     5.5    +      -       -      -
     49D  LYS*     3.0    17.0    +      -       -      +
     50D  LEU*     3.5    17.1    -      -       +      +
     52D  VAL*     1.3    82.8    -      -       -      +
     54D  GLN*     1.3    62.7    +      -       -      +
     56D  TYR*     3.2     9.8    +      -       -      +
     57D  ARG*     3.0    42.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLN 54 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     50D  LEU      2.9    15.3    +      -       -      +
     51D  LYS*     3.0    37.3    +      -       +      +
     53D  ASN*     1.3    75.2    -      -       -      +
     55D  PHE*     1.3    56.7    +      -       -      +
     57D  ARG*     3.3    29.2    +      -       +      +
     58D  HIS*     2.9    31.2    +      -       +      +
    108D  ASP*     3.9     2.4    +      -       -      -
    111D  MET*     3.3    26.2    -      -       +      +
----------------------------------------------------------
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Residues in contact with PHE 55 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     51D  LYS      2.7    16.4    +      -       -      +
     52D  VAL*     3.0    14.6    -      -       -      +
     54D  GLN*     1.3    73.5    -      -       -      +
     56D  TYR*     1.3    68.9    +      +       -      +
     58D  HIS*     3.0     4.3    +      -       -      +
     59D  ALA*     3.0    20.3    +      -       -      +
     79D  MET*     3.4    43.3    -      -       +      +
     80D  PHE*     4.5    11.9    -      +       -      -
     83D  LEU*     3.7    35.4    -      -       +      -
    107D  LEU*     4.0    17.5    -      -       +      -
    110D  ILE*     3.4    37.5    -      -       +      -
    111D  MET*     3.7    27.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with TYR 56 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     23D  VAL*     3.6    17.3    -      -       +      -
     24D  PHE*     2.5    44.9    +      -       -      +
     26D  ASN*     5.9     2.9    -      -       -      -
     29D  LEU*     3.7    12.5    -      -       +      +
     52D  VAL*     2.9    36.9    +      -       +      +
     53D  ASN*     3.5    11.7    -      -       -      +
     55D  PHE*     1.3    79.1    -      +       -      +
     57D  ARG*     1.3    64.5    +      -       +      +
     59D  ALA*     3.1     4.7    +      -       -      +
     60D  PHE*     3.0    50.3    +      +       +      -
     80D  PHE*     3.6    22.2    -      +       -      -
     83D  LEU*     4.3     8.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with ARG 57 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     50D  LEU*     4.3     5.1    +      -       -      +
     53D  ASN*     3.0    39.4    +      -       -      +
     54D  GLN*     3.5    31.4    +      -       -      +
     56D  TYR*     1.3    76.2    -      -       +      +
     58D  HIS*     1.3    57.4    +      -       -      +
     60D  PHE*     3.8     4.4    +      -       -      +
     61D  GLY*     2.9    25.6    +      -       -      -
----------------------------------------------------------
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Residues in contact with HIS 58 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      4D  ARG*     3.4     9.7    +      -       -      -
     54D  GLN*     2.9    15.7    +      -       +      +
     55D  PHE      3.0     9.2    +      -       -      +
     57D  ARG*     1.3    76.2    -      -       -      +
     59D  ALA*     1.3    64.5    +      -       -      +
     61D  GLY*     3.1     2.8    +      -       -      -
     62D  ILE*     3.1    32.7    +      -       +      +
     79D  MET*     4.1     6.7    -      -       +      -
    111D  MET*     3.6    41.4    +      -       +      -
    115D  ASP*     2.8    40.7    +      -       -      -
----------------------------------------------------------
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Residues in contact with ALA 59 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     55D  PHE*     3.0    12.0    +      -       +      +
     56D  TYR      3.1     7.6    +      -       -      +
     58D  HIS*     1.3    75.7    -      -       -      +
     60D  PHE*     1.3    62.2    +      -       -      +
     62D  ILE*     3.0    16.3    +      -       -      +
     63D  VAL*     3.2    11.8    +      -       -      +
     76D  PHE*     3.5    26.1    -      -       +      -
     79D  MET*     3.3    27.1    -      -       +      +
     80D  PHE*     3.6    20.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with PHE 60 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     23D  VAL*     4.7    16.6    -      -       +      -
     56D  TYR*     3.0    54.0    +      +       +      +
     57D  ARG*     4.4     3.8    -      -       -      +
     59D  ALA*     1.3    72.5    -      -       -      +
     61D  GLY*     1.3    61.5    +      -       -      +
     63D  VAL*     3.2    20.6    -      -       +      +
     64D  ASN*     2.8    31.4    +      -       -      +
     76D  PHE*     4.0    23.6    -      +       -      -
     80D  PHE*     4.6     4.0    -      +       -      -
----------------------------------------------------------
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Residues in contact with GLY 61 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      4D  ARG*     4.2     9.5    +      -       -      -
     57D  ARG      2.9    19.5    +      -       -      -
     58D  HIS*     3.1     4.0    +      -       -      -
     59D  ALA      3.1     0.8    -      -       -      -
     60D  PHE*     1.3    76.9    -      -       -      +
     62D  ILE*     1.3    62.0    +      -       -      +
     64D  ASN*     3.1    16.0    +      -       -      +
     65D  ASP*     3.2    18.2    +      -       -      +
    204D  SER*     6.0     0.3    -      -       -      -
----------------------------------------------------------
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Residues in contact with ILE 62 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      4D  ARG*     3.5    30.5    -      -       -      +
     58D  HIS*     3.1    16.7    +      -       +      +
     59D  ALA      3.0     9.1    +      -       -      +
     61D  GLY*     1.3    78.8    -      -       -      +
     63D  VAL*     1.3    58.4    +      -       +      +
     66D  TYR*     3.0    31.0    +      -       +      +
     72D  TYR*     4.8    13.6    -      -       +      +
     75D  ILE*     3.9    15.7    -      -       +      -
     76D  PHE*     5.5     2.2    -      -       +      +
     79D  MET*     3.2    28.5    -      -       +      -
    114D  ALA*     3.9    15.3    -      -       +      -
    115D  ASP*     4.2     2.7    -      -       -      +
    118D  LEU*     4.0    29.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with VAL 63 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     59D  ALA      3.2     4.9    +      -       -      +
     60D  PHE*     3.2    39.7    -      -       +      +
     62D  ILE*     1.3    77.0    -      -       -      +
     64D  ASN*     1.3    59.4    +      -       -      +
     65D  ASP      3.4     0.2    -      -       -      -
     67D  ASN*     3.0    31.0    +      -       +      +
     72D  TYR*     3.5    41.3    -      -       +      +
     76D  PHE*     4.1    16.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with ASN 64 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     60D  PHE      2.8    17.0    +      -       -      +
     61D  GLY*     3.1     8.9    +      -       -      +
     63D  VAL*     1.3    80.9    -      -       -      +
     65D  ASP*     1.3    58.7    +      -       +      +
     67D  ASN*     3.4    14.1    +      -       -      +
    182D  LEU*     4.9     2.3    -      -       -      +
    185D  LYS*     2.8    53.7    +      -       -      +
    203D  THR*     5.5     1.0    -      -       -      +
    204D  SER*     4.6    13.4    -      -       -      -
----------------------------------------------------------
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Residues in contact with ASP 65 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      4D  ARG*     4.0     5.5    +      -       -      -
     61D  GLY      3.2    11.3    +      -       -      +
     64D  ASN*     1.3    80.5    -      -       -      +
     66D  TYR*     1.3    81.7    +      -       +      +
     67D  ASN*     3.7     2.5    +      -       -      +
     68D  GLY      5.2     0.2    +      -       -      -
    128D  PHE*     4.8     0.3    -      -       -      -
    132D  TRP*     3.3    25.4    +      -       +      -
    178D  TRP*     5.9     1.2    -      -       -      -
    182D  LEU*     4.7     8.6    -      -       -      +
    185D  LYS*     4.5     3.0    +      -       -      +
    204D  SER*     3.3    17.0    +      -       -      -
    205D  ASP*     2.8    37.3    +      -       -      +
    206D  PHE*     3.3    28.8    -      -       -      +
----------------------------------------------------------
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Residues in contact with TYR 66 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      1D  MET*     5.3     3.6    -      -       -      -
      2D  LYS      5.0     7.4    +      -       -      -
      3D  LEU*     6.1     0.2    -      -       -      -
      4D  ARG*     4.0     8.9    +      -       -      +
     62D  ILE      3.0    20.6    +      -       -      +
     65D  ASP*     1.3    97.5    -      -       +      +
     67D  ASN*     1.3    55.8    +      -       -      +
     68D  GLY      2.9    12.8    +      -       -      +
     69D  LEU*     2.9    22.9    +      -       +      +
     72D  TYR*     3.3    17.0    -      -       +      +
    118D  LEU*     3.5    41.3    -      -       +      -
    122D  ILE*     4.0    17.5    -      -       +      +
    128D  PHE*     4.0    22.0    -      +       -      -
    132D  TRP*     4.0    24.7    -      +       -      -
    205D  ASP*     2.6    39.4    +      -       +      +
----------------------------------------------------------
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Residues in contact with ASN 67 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     63D  VAL*     3.0    31.2    +      -       +      +
     64D  ASN*     3.4    19.4    +      -       -      +
     65D  ASP      3.7     1.5    -      -       -      -
     66D  TYR*     1.3    74.1    -      -       -      +
     68D  GLY*     1.3    60.7    +      -       -      +
     69D  LEU      3.3     1.0    -      -       -      -
     72D  TYR*     3.5    32.1    -      -       +      +
    177D  TRP*     5.3     9.4    -      -       -      -
    178D  TRP*     3.2    29.3    -      -       -      +
    181D  SER*     6.0     0.9    -      -       -      -
    182D  LEU*     5.7     5.8    -      -       -      +
    185D  LYS*     5.4     0.6    -      -       -      +
----------------------------------------------------------
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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