Contacts of the helix formed by residues 538 - 560 (chain D) in PDB entry 4G7Z


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 SER 538 (chain D).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    524D  LEU      5.0     1.0    +      -       -      -
    525D  ARG*     3.8    35.4    -      -       -      +
    526D  PRO*     3.3     6.8    +      -       -      -
    537D  THR*     1.3    79.0    +      -       -      +
    539D  ASP*     1.3    67.2    +      -       -      +
    540D  LEU*     3.4    21.5    +      -       -      +
    541D  ASN*     2.8    21.0    +      -       -      +
    542D  ASP      4.1     1.2    +      -       -      -
    606D  ILE*     5.7     0.7    -      -       -      +
    317F  LEU*     3.6    11.9    -      -       -      +
    318F  GLU*     3.7    14.3    +      -       -      -
----------------------------------------------------------
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Residues in contact with ASP 539 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    537D  THR*     6.0     0.2    -      -       -      -
    538D  SER*     1.3    71.8    +      -       -      +
    540D  LEU*     1.3    63.2    +      -       -      +
    541D  ASN      3.0     2.0    +      -       -      -
    542D  ASP*     3.2    13.6    +      -       -      +
    543D  LEU*     3.3    14.4    +      -       -      +
    592D  THR*     4.6     1.2    +      -       -      -
    598D  ARG*     3.3    14.1    +      -       -      -
    599D  PRO      3.6     3.3    -      -       -      +
    600D  LEU*     3.2    29.1    -      -       +      +
    601D  ARG      3.0    37.9    +      -       -      +
    316F  SER*     2.2    33.3    +      -       -      -
    318F  GLU*     3.0    28.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 540 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1091C  GLU*     5.8     0.2    -      -       -      +
    520D  LEU*     3.8    26.2    -      -       +      -
    524D  LEU      5.4     1.3    -      -       -      +
    525D  ARG*     4.3    15.0    -      -       +      -
    538D  SER*     2.9    14.7    +      -       -      +
    539D  ASP*     1.3    76.3    -      -       -      +
    541D  ASN*     1.3    57.2    +      -       -      +
    543D  LEU*     3.8     6.8    -      -       +      +
    544D  TYR*     3.0    39.3    +      -       +      -
    581D  LEU*     4.0    15.7    -      -       +      -
    601D  ARG      4.1    11.2    -      -       -      +
    602D  SER*     4.2     2.0    -      -       -      -
    603D  LEU*     3.6    39.5    -      -       +      +
    606D  ILE*     3.5    26.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with ASN 541 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     31D  THR*     5.2     1.3    -      -       +      -
     44D  LEU*     3.7    10.7    -      -       +      +
     45D  PHE*     3.4    24.1    -      -       +      -
    525D  ARG*     2.7    56.9    +      -       -      +
    526D  PRO      4.2     0.2    +      -       -      -
    537D  THR*     3.0    24.3    +      -       -      +
    538D  SER*     2.8    17.0    +      -       -      +
    540D  LEU*     1.3    76.4    -      -       -      +
    542D  ASP*     1.3    67.1    -      -       -      +
    543D  LEU      3.1     1.3    -      -       -      -
    545D  ARG*     3.2    29.9    +      -       -      +
    257F  THR*     5.1     5.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with ASP 542 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    537D  THR*     4.2    13.8    -      -       -      +
    538D  SER      4.1     0.8    +      -       -      -
    539D  ASP*     3.2     9.7    +      -       -      +
    541D  ASN*     1.3    77.1    -      -       -      +
    543D  LEU*     1.3    57.0    +      -       -      +
    545D  ARG*     3.8    17.2    +      -       -      +
    546D  ARG*     3.4    26.3    +      -       -      +
    592D  THR*     3.4    23.5    +      -       -      +
    593D  ASN*     6.2     0.2    -      -       -      -
    600D  LEU*     4.4    17.8    -      -       +      +
    257F  THR*     3.1    39.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 543 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    539D  ASP      3.3    14.7    +      -       -      +
    540D  LEU*     3.8    11.9    -      -       +      +
    541D  ASN      3.1     0.4    -      -       -      -
    542D  ASP*     1.3    77.9    -      -       -      +
    544D  TYR*     1.3    59.9    +      -       -      +
    546D  ARG*     3.0    31.2    -      -       -      +
    547D  LEU*     3.7     5.7    +      -       -      +
    577D  ALA      4.6     4.3    -      -       -      +
    580D  ALA*     3.4    46.7    -      -       +      +
    581D  LEU*     4.0    15.3    -      -       +      +
    584D  ASN*     4.4     2.5    -      -       -      +
    590D  PRO*     4.4     0.9    -      -       +      -
    600D  LEU*     3.5    38.6    -      -       +      +
    601D  ARG      4.1     4.9    -      -       -      +
    602D  SER*     3.9    22.7    -      -       -      -
----------------------------------------------------------
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Residues in contact with TYR 544 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1094C  ALA      4.2     0.5    +      -       -      -
     44D  LEU*     3.9    22.9    -      -       +      -
     93D  ILE*     4.4    12.6    -      -       +      -
    517D  VAL*     4.6     5.4    -      -       +      -
    518D  PRO      2.9    26.7    +      -       -      -
    519D  VAL*     4.0    18.2    -      -       +      -
    520D  LEU*     3.4    22.9    +      -       +      +
    525D  ARG*     4.3    22.0    -      -       -      -
    540D  LEU*     3.0    29.1    +      -       +      +
    541D  ASN      3.6     0.2    +      -       -      -
    543D  LEU*     1.3    73.6    -      -       -      +
    545D  ARG*     1.3    57.5    +      -       -      +
    546D  ARG      3.1     4.7    -      -       -      -
    547D  LEU*     3.3     6.0    +      -       +      +
    548D  ILE*     3.0    35.3    +      -       -      +
    581D  LEU*     3.5    36.2    -      -       +      +
    603D  LEU*     4.2    15.8    -      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 545 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     29D  PRO*     3.1    37.9    -      -       +      +
     30D  GLU*     5.0     1.0    -      -       -      +
     31D  THR*     4.1    14.1    -      -       -      -
     44D  LEU*     3.8     8.5    -      -       +      -
    541D  ASN      3.2    20.6    +      -       -      +
    542D  ASP*     4.0    16.6    +      -       -      +
    543D  LEU      3.5     0.2    -      -       -      -
    544D  TYR*     1.3    75.1    -      -       -      +
    546D  ARG*     1.3    55.7    +      -       -      +
    548D  ILE*     4.0     9.0    -      -       -      -
    549D  ASN*     2.6    45.8    +      -       -      +
    254F  GLN*     3.4    23.4    +      -       -      +
    255F  ALA      4.8     2.0    +      -       -      -
    256F  ARG*     3.2    18.2    +      -       -      +
    257F  THR*     3.6    40.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 546 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    542D  ASP      3.4    12.0    +      -       -      +
    543D  LEU*     3.0    44.0    -      -       -      +
    544D  TYR      3.1     1.0    -      -       -      -
    545D  ARG*     1.3    77.2    -      -       -      +
    547D  LEU*     1.3    64.8    +      -       -      +
    549D  ASN*     3.6     6.5    +      -       -      +
    550D  ARG*     3.3    61.8    +      -       -      +
    576D  GLU      4.1     6.7    +      -       -      -
    577D  ALA*     3.9    23.5    -      -       +      +
    580D  ALA*     4.2     8.4    -      -       -      +
    590D  PRO*     4.7    19.6    -      -       -      +
    591D  VAL      5.6     1.6    +      -       -      -
    600D  LEU*     5.2     4.0    -      -       -      +
    208F  SER*     5.2     4.6    +      -       -      -
    211F  ASP*     5.5     2.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 547 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     93D  ILE*     4.5    20.2    -      -       +      -
     95D  LEU*     4.6     8.1    -      -       +      -
    517D  VAL*     4.5     8.5    -      -       +      -
    543D  LEU      4.0     9.0    -      -       -      +
    544D  TYR*     3.3    11.4    +      -       +      +
    546D  ARG*     1.3    79.4    -      -       -      +
    548D  ILE*     1.3    65.0    +      -       -      +
    550D  ARG*     3.2     2.2    +      -       -      -
    551D  ASN*     2.9    26.4    +      -       +      +
    574D  LEU*     3.9    26.2    -      -       +      +
    577D  ALA*     3.5    25.8    -      -       +      +
    578D  VAL*     3.9    26.7    -      -       +      -
    581D  LEU*     4.3    21.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with ILE 548 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     26D  VAL*     3.3    33.2    -      -       +      +
     27D  GLU      4.1     9.2    -      -       -      +
     28D  LYS      3.7     4.3    -      -       -      +
     29D  PRO*     3.5    34.3    -      -       +      -
     44D  LEU*     4.6    10.5    -      -       +      -
     93D  ILE*     3.4    32.8    -      -       +      -
    544D  TYR      3.0    27.9    +      -       -      +
    545D  ARG*     4.2     7.2    -      -       -      +
    547D  LEU*     1.3    77.6    -      -       -      +
    549D  ASN*     1.3    56.5    +      -       -      +
    551D  ASN*     3.4     4.6    +      -       -      +
    552D  ASN*     2.9    37.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASN 549 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     29D  PRO*     3.5    26.0    -      -       -      +
    545D  ARG*     2.6    30.4    +      -       -      +
    546D  ARG*     3.7     8.4    -      -       -      +
    547D  LEU      3.2     0.4    -      -       -      -
    548D  ILE*     1.3    80.0    -      -       -      +
    550D  ARG*     1.3    59.7    +      -       +      +
    552D  ASN*     3.5     3.9    +      -       -      +
    553D  ARG*     2.9    36.7    +      -       -      +
    207F  LEU*     5.9     1.0    -      -       -      +
    211F  ASP*     5.9     2.7    -      -       -      +
    254F  GLN*     3.8    49.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 550 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    546D  ARG*     3.3    46.9    +      -       -      +
    547D  LEU*     3.2     6.2    +      -       -      +
    549D  ASN*     1.3    74.9    -      -       +      +
    551D  ASN*     1.3    60.0    +      -       -      +
    553D  ARG*     4.0     4.9    -      -       -      +
    554D  LEU*     3.1    27.0    +      -       -      +
    570D  GLU*     3.5    15.9    -      -       -      +
    573D  MET*     2.9    58.9    +      -       +      +
    574D  LEU*     3.5    16.3    -      -       +      +
    576D  GLU*     4.3     7.1    +      -       -      +
    577D  ALA*     4.0    14.0    -      -       -      +
    208F  SER*     3.5    15.6    +      -       -      -
    210F  LEU*     4.9     5.7    -      -       -      +
    211F  ASP*     3.0    32.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASN 551 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     93D  ILE*     3.4    22.0    -      -       +      +
     94D  GLU      3.3    18.2    +      -       -      +
     95D  LEU*     3.6    13.0    -      -       +      +
     96D  ALA*     3.4    29.1    +      -       -      +
    547D  LEU*     2.9    17.0    +      -       +      +
    548D  ILE*     3.5     6.1    -      -       -      +
    550D  ARG*     1.3    76.7    -      -       -      +
    552D  ASN*     1.3    57.4    +      -       -      +
    554D  LEU*     3.1     5.3    +      -       -      +
    555D  LYS*     2.8    56.7    +      -       -      +
    574D  LEU*     3.4    12.2    -      -       +      +
----------------------------------------------------------
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Residues in contact with ASN 552 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     27D  GLU*     2.4    37.0    +      -       -      +
     28D  LYS*     4.9     0.8    -      -       -      +
     29D  PRO*     5.6     2.5    -      -       +      +
     93D  ILE*     5.2     1.2    -      -       -      +
    548D  ILE*     2.9    25.9    +      -       +      +
    549D  ASN*     4.2     3.4    -      -       -      +
    551D  ASN*     1.3    89.0    +      -       -      +
    553D  ARG*     1.3    58.5    +      -       -      +
    555D  LYS*     4.0    20.7    +      -       -      +
    556D  LYS*     3.7    16.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 553 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    549D  ASN*     2.9    23.4    +      -       -      +
    550D  ARG*     4.0     6.5    -      -       -      +
    552D  ASN*     1.3    75.1    -      -       -      +
    554D  LEU*     1.3    62.1    +      -       -      +
    555D  LYS      3.3     0.4    -      -       -      -
    556D  LYS*     3.2     4.1    +      -       -      +
    557D  LEU*     2.9    36.0    +      -       +      +
    570D  GLU*     2.9    40.0    +      -       -      +
    573D  MET*     3.3    16.4    -      -       -      +
    211F  ASP*     3.5    24.7    +      -       -      +
    214F  GLN*     3.7    22.3    -      -       -      +
    215F  GLU*     2.8    43.0    +      -       -      +
    218F  GLN*     3.8    19.7    -      -       -      +
    254F  GLN*     3.9    11.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 554 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     96D  ALA*     3.6    14.1    -      -       +      -
     97D  THR*     4.2     4.0    -      -       -      +
    550D  ARG      3.1    19.1    +      -       -      +
    551D  ASN*     3.1     6.1    +      -       -      +
    553D  ARG*     1.3    72.9    -      -       -      +
    555D  LYS*     1.3    66.0    +      -       -      +
    557D  LEU*     3.3     1.7    +      -       -      +
    558D  LEU*     3.1    46.7    +      -       +      +
    567D  ILE*     3.8    19.3    -      -       +      -
    570D  GLU*     3.7    21.9    -      -       +      +
    571D  LYS*     3.8    31.6    -      -       +      -
    574D  LEU*     3.4    31.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with LYS 555 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     25D  GLU*     3.2    25.9    +      -       -      -
     27D  GLU*     5.2     6.1    -      -       -      +
     94D  GLU*     3.8     9.9    +      -       -      +
     96D  ALA*     4.6    12.6    -      -       +      +
    551D  ASN*     2.8    40.2    +      -       -      +
    552D  ASN*     4.1    23.2    +      -       -      +
    554D  LEU*     1.3    77.4    -      -       -      +
    556D  LYS*     1.3    60.9    +      -       -      +
    558D  LEU*     3.4     4.9    +      -       -      -
    559D  ALA*     3.6     2.3    +      -       -      +
    142F  ARG*     2.5    39.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 556 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    552D  ASN      3.7    12.0    +      -       -      +
    553D  ARG*     3.2    10.2    +      -       -      +
    555D  LYS*     1.3    77.2    -      -       -      +
    557D  LEU*     1.3    66.7    +      -       -      +
    559D  ALA*     3.5     3.6    +      -       -      +
    560D  GLN*     2.7    51.0    +      -       +      +
    218F  GLN*     2.4    44.8    +      -       -      +
    222F  ARG*     4.7     7.7    -      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 557 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    553D  ARG*     2.9    22.1    +      -       +      +
    554D  LEU      3.3     2.2    +      -       -      +
    556D  LYS*     1.3    78.5    -      -       -      +
    558D  LEU*     1.3    56.6    +      -       -      +
    560D  GLN*     3.3     7.7    +      -       +      +
    561D  GLY      3.0    22.5    +      -       -      -
    562D  ALA*     3.3    24.9    +      -       +      +
    566D  ILE*     3.7    15.3    -      -       +      -
    567D  ILE*     3.7    16.6    -      -       +      -
    570D  GLU*     3.7    36.1    -      -       +      +
    214F  GLN*     3.7    17.5    -      -       -      +
    218F  GLN*     4.4    29.4    -      -       +      +
    221F  ILE*     4.5    11.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 558 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     96D  ALA*     4.2    14.8    -      -       +      +
     97D  THR*     5.5     0.2    -      -       -      +
    554D  LEU*     3.1    39.6    +      -       +      +
    555D  LYS*     3.4     3.1    +      -       -      +
    556D  LYS      3.3     0.6    -      -       -      -
    557D  LEU*     1.3    76.5    -      -       -      +
    559D  ALA*     1.3    60.2    +      -       -      +
    561D  GLY*     3.4     7.3    +      -       -      +
    567D  ILE*     3.4    36.6    -      -       +      -
    571D  LYS*     4.3    10.5    -      -       -      +
    140F  ARG*     3.6    35.4    -      -       +      +
    142F  ARG*     3.7    25.7    -      -       -      +
    144F  ILE*     5.2     0.5    -      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 559 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    555D  LYS      4.2     1.1    -      -       -      +
    556D  LYS*     3.5     7.1    +      -       -      +
    558D  LEU*     1.3    73.9    -      -       -      +
    560D  GLN*     1.3    61.1    +      -       +      +
    561D  GLY*     3.1     5.8    +      -       -      -
    129F  GLU*     4.0     5.4    -      -       -      +
    132F  ARG*     3.6    12.3    +      -       -      -
    142F  ARG*     3.4    27.4    -      -       -      +
    144F  ILE*     3.8    30.1    -      -       +      +
    145F  PRO*     3.9    17.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLN 560 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    556D  LYS*     2.7    60.4    +      -       +      +
    557D  LEU*     3.3     9.2    +      -       +      +
    559D  ALA*     1.3    77.4    -      -       +      +
    561D  GLY*     1.3    64.4    +      -       -      +
    562D  ALA*     3.6     0.6    +      -       -      -
    132F  ARG*     3.8    10.3    +      -       -      +
    184F  ARG*     3.2    18.9    +      -       -      -
    218F  GLN*     4.0     5.9    +      -       -      +
    221F  ILE*     3.6    26.2    -      -       +      +
    222F  ARG*     2.9    36.7    -      -       -      +
    225F  GLU*     5.3     1.5    +      -       -      +
----------------------------------------------------------
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A short description of the analytical approach
The contact analysis used in this page is based upon the approach developed in: Sobolev V., Wade R.C., Vriend G. and Edelman M. PROTEINS (1996) 25, 120-129. Contact legitimacy depends on the hydrophobic-hydrophilic properties of the contacting atoms. In order to define it, for each inter-atomic contact, eight atom classes have been introduced:


   I  Hydrophilic      - N and O that can donate and accept hydrogen bonds
                         (e.g., oxygen of hydroxyl group of Ser. or Thr)
  II  Acceptor         - N or O that can only accept a hydrogen bond
 III  Donor            - N that can only donate a hydrogen bond
  IV  Hydrophobic      - Cl, Br, I and all C atoms that are not in
                         aromatic rings and do not have a covalent bond to
                         a N or O atom
   V  Aromatic         - C in aromatic rings irrespective of any other 
                         bonds formed by the atom
  VI  Neutral          - C atoms that have a covalent bond to at least one
                         atom of class I or two or more atoms from class II
                         or III; atoms; S, F, P, and metal atoms in all cases
 VII  Neutral-donor    - C atoms that have a covalent bond with only one
                         atom of class III
VIII  Neutral-acceptor - C atoms that have a covalent bond with only 
                         one atom of class II
For each pair of contacts the state of legitimacy is shown below:

Legend:
+, legitimate
-, illegitimate
------------------------------------------------------------
  Atomic class           I  II  III   IV   V   VI  VII  VIII
------------------------------------------------------------
   I  (Hydrophilic)      +   +    +    -   +   +    +    +
  II  (Acceptor)         +   -    +    -   +   +    +    -
 III  (Donor)            +   +    -    -   +   +    -    +
  IV  (Hydrophobic)      -   -    -    +   +   +    +    +
   V  (Aromatic)         +   +    +    +   +   +    +    +
  VI  (Neutral)          +   +    +    +   +   +    +    +
 VII  (Neutral-donor)    +   +    -    +   +   +    -    +
VIII  (Neutral-acceptor) +   -    +    +   +   +    +    -
------------------------------------------------------------
Warning!
Atom classes for heterogroups are automatically assigned based on the atomic coordinates. However, in three cases (see below) the automatic assignment is currently ambiguous. In these cases, the user is advised to manually analyse the full list of contacts using LPC software.
1. Carbon atoms belonging to a 4-, 5- or 6-member ring are 
   considered "aromatic" (Class V) if the ring is approximately
   planar, and "hydrophobic" (Class IV) or "neutral" (Classes
   VI, VII, VIII) if the ring is non-planar.
2. The oxygen atom of a carbonyl or hydroxy group is considered
   "hydroxy" (Class I) if the CO bond is longer than 1.29 Å, and
   "carbonyl" (Class II) if shorter.
3. All nitrogen atoms are considered "hydrophilic" (Class I).

Please E-mail any questions and/or suggestions concerning this page to Vladimir.Sobolev@weizmann.ac.il