Contacts of the helix formed by residues 43 - 69 (chain B) in PDB entry 1XJZ


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 43 (chain B).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     41B  GLN*     5.7     2.0    -      -       +      +
     42B  VAL*     1.3    80.0    -      -       -      +
     44B  ARG*     1.3    59.9    +      -       -      +
     45B  ASP*     3.7     8.4    +      -       -      +
     46B  GLY*     3.1    16.0    +      -       -      +
     47B  PHE*     2.9    27.7    +      -       -      +
    155B  LEU*     4.0     4.0    -      -       -      -
    221B  LEU*     4.9     6.6    -      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 44 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     43B  THR*     1.3    73.9    -      -       -      +
     45B  ASP*     1.3    71.5    +      -       -      +
     46B  GLY      3.1     0.2    +      -       -      -
     47B  PHE*     3.2     2.1    +      -       -      +
     48B  LYS*     2.9    50.4    +      -       +      +
     95B  PHE*     5.2     3.4    +      -       -      -
     96B  TRP*     3.4    54.2    +      -       +      +
    155B  LEU*     3.6    20.6    -      -       +      +
----------------------------------------------------------
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Residues in contact with ASP 45 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     43B  THR*     3.4     7.0    +      -       -      +
     44B  ARG*     1.3    87.7    -      -       -      +
     46B  GLY*     1.3    60.9    +      -       -      +
     48B  LYS*     3.9    13.9    +      -       -      +
     49B  LEU*     3.1    29.0    +      -       +      +
    221B  LEU*     4.0    16.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLY 46 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     33B  PHE*     3.8     7.7    -      -       -      -
     42B  VAL*     4.2     7.6    -      -       -      -
     43B  THR*     3.1    13.1    +      -       -      -
     44B  ARG      3.1     0.8    -      -       -      -
     45B  ASP*     1.3    78.4    -      -       -      +
     47B  PHE*     1.3    62.4    -      -       -      +
     49B  LEU*     3.2     5.6    +      -       -      +
     50B  VAL*     3.1    25.3    +      -       -      +
    221B  LEU*     3.7    27.5    -      -       -      +
----------------------------------------------------------
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Residues in contact with PHE 47 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     37B  PHE*     3.8    28.5    -      +       -      -
     42B  VAL*     3.8     7.9    -      -       +      +
     43B  THR      2.9    15.2    +      -       -      +
     44B  ARG      3.2     3.6    +      -       -      +
     46B  GLY*     1.3    74.6    -      -       -      +
     48B  LYS*     1.3    58.2    +      -       +      +
     50B  VAL*     3.2     9.0    +      -       +      +
     51B  MET*     2.9    53.9    +      -       +      +
     96B  TRP*     3.5    39.0    -      +       -      -
    151B  ALA*     3.7    24.7    -      -       +      -
    155B  LEU*     3.9    13.7    -      -       +      -
    157B  LEU*     6.5     0.2    -      -       +      -
    164B  LEU*     3.5    25.6    -      -       +      -
    167B  PHE*     3.6    23.8    -      +       -      -
----------------------------------------------------------
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Residues in contact with LYS 48 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     44B  ARG*     2.9    51.7    +      -       +      +
     45B  ASP*     3.9    12.9    +      -       -      +
     47B  PHE*     1.3    77.5    -      -       -      +
     49B  LEU*     1.3    57.1    +      -       -      +
     51B  MET*     3.2     7.6    +      -       -      +
     52B  ALA*     2.9    25.5    +      -       -      +
     96B  TRP*     3.6    43.2    +      -       +      +
     97B  TYR*     3.3    50.3    +      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 49 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     45B  ASP*     3.1    12.6    +      -       +      +
     46B  GLY      3.2     7.6    +      -       -      +
     48B  LYS*     1.3    74.8    -      -       -      +
     50B  VAL*     1.3    54.2    +      -       -      +
     52B  ALA*     3.3     3.8    +      -       -      +
     53B  SER*     2.7    38.4    +      -       -      -
     97B  TYR*     4.3     2.7    -      -       -      +
    106B  PRO*     3.7    28.9    -      -       +      -
    108B  THR*     4.9     4.9    -      -       +      -
    111B  MET*     4.0    16.5    -      -       +      +
    217B  LEU*     4.1    25.1    -      -       +      +
    220B  LEU*     4.5    16.4    -      -       +      -
    221B  LEU*     3.8    33.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with VAL 50 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     33B  PHE*     3.2    44.2    -      -       +      -
     37B  PHE*     4.5    15.3    -      -       +      -
     46B  GLY      3.1     6.1    +      -       -      +
     47B  PHE*     3.2    14.6    +      -       +      +
     49B  LEU*     1.3    77.4    -      -       -      +
     51B  MET*     1.3    61.7    +      -       -      +
     53B  SER*     3.2     8.3    +      -       -      -
     54B  LEU*     3.0    45.4    +      -       +      +
    167B  PHE*     5.9     2.7    -      -       +      -
    214B  PHE*     6.1     2.0    -      -       +      -
    217B  LEU*     4.5     6.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with MET 51 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     47B  PHE*     2.9    47.3    +      -       +      +
     48B  LYS*     3.2     8.0    +      -       -      +
     50B  VAL*     1.3    76.6    -      -       -      +
     52B  ALA*     1.3    63.4    +      -       -      +
     54B  LEU*     3.5    15.6    +      -       -      +
     55B  TYR*     3.1    22.2    +      -       -      +
     89B  LEU*     4.0     6.3    -      -       +      +
     92B  ASP*     3.3    35.9    -      -       +      +
     93B  LEU*     3.8    16.3    -      -       +      +
     96B  TRP*     4.5    10.5    -      -       +      +
     97B  TYR*     5.6     1.3    -      -       +      -
    163B  GLY      3.7    15.3    -      -       -      +
    166B  PHE*     4.1    12.1    -      -       +      -
    167B  PHE*     4.0    17.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 52 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     48B  LYS      2.9    15.7    +      -       -      +
     49B  LEU      3.6     4.9    -      -       -      +
     51B  MET*     1.3    73.7    -      -       -      +
     53B  SER*     1.3    67.3    +      -       -      +
     55B  TYR*     3.2     9.0    +      -       -      +
     56B  HIS*     3.1    29.0    +      -       -      +
     93B  LEU*     4.5     6.9    -      -       -      +
     97B  TYR*     4.1     4.7    -      -       +      +
    105B  ILE*     4.5     7.9    -      -       +      -
    106B  PRO*     4.0    39.3    -      -       +      +
    111B  MET*     4.6     1.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with SER 53 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     49B  LEU      2.7    21.3    +      -       -      -
     50B  VAL*     3.4     9.6    -      -       -      -
     52B  ALA*     1.3    77.7    -      -       -      +
     54B  LEU*     1.3    63.4    +      -       -      +
     56B  HIS*     3.2     2.6    +      -       -      +
     57B  ILE*     3.0    29.1    +      -       -      +
    111B  MET*     3.4    31.2    -      -       -      +
    213B  LEU*     3.6    32.2    -      -       -      +
    217B  LEU*     4.0     5.1    -      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 54 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     50B  VAL*     3.0    38.3    +      -       +      +
     51B  MET*     3.7    12.8    -      -       -      +
     53B  SER*     1.3    78.2    -      -       -      +
     55B  TYR*     1.3    56.9    +      -       -      +
     57B  ILE*     3.7     7.4    -      -       +      +
     58B  TYR*     2.8    40.3    +      -       +      +
     89B  LEU*     3.7    12.3    -      -       +      -
    136B  ARG*     4.1    35.0    -      -       -      +
    140B  ASP*     4.5     1.3    -      -       -      +
    166B  PHE*     3.6    38.6    -      -       +      -
    167B  PHE*     5.2     2.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with TYR 55 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     51B  MET      3.1     9.5    +      -       -      +
     52B  ALA      3.2     5.4    +      -       -      +
     54B  LEU*     1.3    76.5    -      -       -      +
     56B  HIS*     1.3    72.2    +      +       -      +
     58B  TYR*     3.8     0.9    -      -       -      +
     59B  VAL*     2.9    62.1    +      -       +      +
     86B  LYS*     4.8     4.5    -      -       +      -
     89B  LEU*     3.7    24.4    -      -       +      +
     90B  GLU*     3.9    18.0    +      -       +      -
     93B  LEU*     3.3    26.2    -      -       +      -
    101B  TRP*     3.5    25.2    -      +       -      -
    102B  GLN*     3.6    21.8    +      -       +      -
    105B  ILE*     3.7    31.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with HIS 56 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     52B  ALA      3.1    16.7    +      -       -      -
     53B  SER*     3.7     5.6    -      -       -      +
     55B  TYR*     1.3    91.9    -      +       -      +
     57B  ILE*     1.3    63.0    +      -       +      +
     59B  VAL*     3.5     5.4    +      -       +      +
     60B  ALA*     3.2    17.0    +      -       -      +
    105B  ILE*     3.6    26.7    -      -       +      +
    106B  PRO      2.9    30.2    +      -       -      -
    107B  TYR*     3.6    37.5    -      +       +      +
    111B  MET*     3.7    10.3    -      -       +      -
    115B  VAL*     3.3    26.9    -      -       +      +
----------------------------------------------------------
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Residues in contact with ILE 57 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     53B  SER*     3.0    23.2    +      -       -      +
     54B  LEU*     3.7    10.1    -      -       +      +
     56B  HIS*     1.3    78.9    -      -       +      +
     58B  TYR*     1.3    58.8    +      -       -      +
     60B  ALA      3.3     1.7    +      -       -      -
     61B  LEU*     2.9    27.7    +      -       +      +
    111B  MET*     5.3     4.3    -      -       -      +
    114B  TYR*     3.3    63.0    -      -       +      -
    115B  VAL*     4.5     3.8    -      -       +      -
    118B  LEU*     3.5    11.8    -      -       +      +
    136B  ARG*     3.9    30.7    -      -       +      +
    210B  ASN*     5.0     0.4    -      -       -      +
    213B  LEU*     4.1    15.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with TYR 58 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     54B  LEU*     2.8    31.8    +      -       +      +
     55B  TYR      4.1     0.7    -      -       -      +
     57B  ILE*     1.3    72.5    -      -       -      +
     59B  VAL*     1.3    66.5    +      -       -      +
     61B  LEU*     4.2    15.0    -      -       +      -
     62B  GLU*     2.9    53.7    +      -       -      +
     85B  ARG*     3.8    13.8    -      -       +      +
     86B  LYS*     4.6     5.8    -      -       -      +
     89B  LEU*     3.7    20.6    -      -       +      -
    136B  ARG*     3.5    24.4    +      -       +      -
    137B  TYR*     3.3    38.2    -      +       -      -
    140B  ASP*     2.4    37.8    +      -       -      +
    166B  PHE*     3.5    15.9    -      +       -      -
    169B  PHE*     5.2     0.2    -      -       -      -
----------------------------------------------------------
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Residues in contact with VAL 59 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     55B  TYR*     2.9    64.4    +      -       +      +
     56B  HIS*     3.7     6.7    -      -       +      +
     57B  ILE      3.3     0.2    -      -       -      -
     58B  TYR*     1.3    76.4    -      -       -      +
     60B  ALA*     1.3    65.3    +      -       +      +
     62B  GLU*     4.1     0.7    -      -       -      +
     63B  GLU*     3.1    46.3    +      -       +      +
     86B  LYS*     4.2    29.4    -      -       +      +
    119B  HIS*     6.1     0.4    -      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 60 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     56B  HIS      3.2    14.4    +      -       -      +
     57B  ILE      3.7     3.1    -      -       -      +
     59B  VAL*     1.3    79.5    -      -       +      +
     61B  LEU*     1.3    64.7    +      -       -      +
     63B  GLU*     3.3     2.3    +      -       -      +
     64B  GLU*     3.1    28.9    +      -       -      +
    115B  VAL*     3.9    14.1    -      -       +      -
    118B  LEU*     3.9    19.3    -      -       +      -
    119B  HIS*     3.6    30.2    -      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 61 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     57B  ILE*     2.9    19.0    +      -       +      +
     58B  TYR*     4.0    15.3    -      -       +      +
     60B  ALA*     1.3    77.3    -      -       -      +
     62B  GLU*     1.3    58.4    +      -       -      +
     64B  GLU*     3.3     5.4    +      -       -      +
     65B  ILE*     2.9    45.8    +      -       +      +
    118B  LEU*     3.9    23.7    -      -       +      +
    129B  LEU*     4.1    20.9    -      -       +      -
    132B  HIS*     4.3     0.7    -      -       +      +
    133B  ALA*     4.2    18.6    -      -       +      +
    136B  ARG*     3.9    32.1    -      -       +      -
    137B  TYR*     3.9    20.9    -      -       +      +
----------------------------------------------------------
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Residues in contact with GLU 62 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     58B  TYR*     2.9    28.0    +      -       +      +
     59B  VAL*     4.5     1.3    -      -       -      +
     61B  LEU*     1.3    74.0    -      -       +      +
     63B  GLU*     1.3    65.9    +      -       -      +
     65B  ILE*     3.8     8.5    -      -       +      +
     66B  GLU*     3.0    31.0    +      -       +      +
     84B  HIS*     3.3    13.3    -      -       -      +
     85B  ARG      2.8    24.0    +      -       -      -
     86B  LYS*     3.1    36.9    +      -       +      +
    137B  TYR*     2.7    29.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 63 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     59B  VAL*     3.1    35.0    +      -       +      +
     60B  ALA      3.3     4.2    +      -       -      +
     62B  GLU*     1.3    76.1    -      -       -      +
     64B  GLU*     1.3    61.5    +      -       -      +
     66B  GLU*     3.4     6.4    +      -       -      +
     67B  ARG*     3.0    27.5    +      -       -      +
     86B  LYS*     6.0     6.3    -      -       +      -
    119B  HIS*     3.4    25.8    +      -       +      -
----------------------------------------------------------
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Residues in contact with GLU 64 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     60B  ALA      3.1    13.4    +      -       -      +
     61B  LEU*     3.7     7.4    -      -       -      +
     63B  GLU*     1.3    76.8    -      -       -      +
     65B  ILE*     1.3    64.9    -      -       -      +
     67B  ARG*     2.8    45.4    +      -       -      -
     68B  ASN*     2.8    29.6    +      -       -      +
    118B  LEU*     3.5    22.2    -      -       +      +
    119B  HIS*     2.7    33.6    +      -       -      +
    122B  GLY*     3.1    26.2    -      -       -      -
    129B  LEU*     3.6    13.9    -      -       +      +
----------------------------------------------------------
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Residues in contact with ILE 65 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     61B  LEU*     2.9    33.7    +      -       +      +
     62B  GLU*     3.8     8.5    -      -       +      +
     63B  GLU      3.3     0.2    -      -       -      -
     64B  GLU*     1.3    76.9    -      -       -      +
     66B  GLU*     1.3    54.8    +      -       -      +
     68B  ASN      3.2     1.0    +      -       -      -
     69B  LYS*     2.7    34.1    +      -       -      +
     74B  PHE*     3.5    42.3    -      -       +      -
     78B  TYR*     3.6    23.8    -      -       +      -
    129B  LEU*     3.8    13.0    -      -       +      -
    133B  ALA*     4.6     0.4    -      -       +      -
    137B  TYR*     3.9    34.1    -      -       +      +
----------------------------------------------------------
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Residues in contact with GLU 66 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     62B  GLU*     3.0    22.9    +      -       +      +
     63B  GLU*     3.7     6.5    -      -       -      +
     64B  GLU      3.2     0.2    -      -       -      -
     65B  ILE*     1.3    79.1    -      -       +      +
     67B  ARG*     1.3    60.5    +      -       -      +
     69B  LYS*     3.3    46.0    +      -       -      +
     78B  TYR*     2.5    39.9    +      -       -      -
     80B  PRO*     4.6     3.8    -      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 67 (chain B). Click here for Legend to table.
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                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     63B  GLU*     3.0    18.0    +      -       -      +
     64B  GLU*     2.8    42.4    +      -       -      +
     65B  ILE      3.3     0.2    -      -       -      -
     66B  GLU*     1.3    77.8    -      -       -      +
     68B  ASN*     1.3    73.8    +      -       -      +
     69B  LYS*     4.0     0.3    +      -       -      +
     70B  GLU      5.2     0.7    +      -       -      -
    122B  GLY      3.8     8.9    +      -       -      -
    123B  ARG*     3.1    50.6    -      -       -      +
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Residues in contact with ASN 68 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     64B  GLU      2.8    24.5    +      -       -      +
     65B  ILE      3.4     2.5    -      -       -      +
     67B  ARG*     1.3    91.9    +      -       -      +
     69B  LYS*     1.3    62.4    +      -       -      +
     70B  GLU      3.2     3.4    -      -       -      -
     71B  SER*     3.0    28.6    +      -       -      -
     74B  PHE*     3.8    20.6    -      -       +      +
    122B  GLY*     3.0    24.8    +      -       -      +
    126B  PRO*     3.1    34.8    -      -       +      +
    129B  LEU*     4.4     5.9    -      -       +      +
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Residues in contact with LYS 69 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     65B  ILE      2.7    18.4    +      -       -      +
     66B  GLU*     3.3    35.9    +      -       -      +
     67B  ARG      3.6     0.4    -      -       -      -
     68B  ASN*     1.3    73.8    -      -       -      +
     70B  GLU*     1.3    80.9    +      -       +      +
     74B  PHE*     4.8     4.7    -      -       -      -
     75B  ALA*     3.4    23.9    -      -       -      +
     78B  TYR*     3.4    52.3    -      -       +      +
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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
------------------------------------------------------------
  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