Contacts of the helix formed by residues 968 - 993 (chain A) in PDB entry 4ZZ0


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 968 (chain A).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    932A  LEU*     3.6     9.9    -      -       -      -
    966A  GLY      3.9     9.0    -      -       -      +
    967A  ASP*     1.3    78.7    -      -       -      +
    969A  VAL*     1.3    65.4    +      -       -      +
    970A  ALA*     3.2    19.8    +      -       -      +
    971A  THR*     3.0    18.7    +      -       +      +
    972A  LEU*     2.8    23.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 969 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    928A  HIS*     4.1    25.8    -      -       +      -
    929A  GLU*     3.8    33.2    -      -       +      +
    932A  LEU*     3.6    11.8    -      -       +      +
    968A  THR*     1.3    73.4    -      -       -      +
    970A  ALA*     1.3    58.5    +      -       -      +
    972A  LEU*     4.7     0.4    -      -       -      -
    973A  SER*     2.7    43.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 970 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    968A  THR*     3.1    10.8    +      -       -      +
    969A  VAL*     1.3    82.7    -      -       -      +
    971A  THR*     1.3    65.1    +      -       +      +
    973A  SER*     3.3     5.6    +      -       -      -
    974A  GLU*     3.3    21.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with THR 971 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    966A  GLY      5.8     1.1    -      -       -      +
    967A  ASP*     2.7    29.0    +      -       -      -
    968A  THR*     3.0    27.6    +      -       +      +
    970A  ALA*     1.3    77.8    -      -       +      +
    972A  LEU*     1.3    64.8    +      -       -      +
    974A  GLU*     3.5    14.8    +      -       -      +
    975A  ARG*     3.2    28.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 972 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    928A  HIS*     3.8    26.5    -      -       +      +
    931A  ALA*     4.5     6.5    -      -       +      -
    932A  LEU*     4.0    27.4    -      -       +      -
    939A  THR*     3.8    28.7    -      -       +      -
    961A  VAL*     4.9     0.9    -      -       +      -
    962A  PRO      4.0     5.8    -      -       -      +
    963A  VAL*     4.1     9.0    -      -       +      -
    967A  ASP*     3.7    12.3    -      -       +      +
    968A  THR      2.8    17.9    +      -       -      +
    969A  VAL*     4.3     2.2    -      -       -      +
    971A  THR*     1.3    76.5    +      -       -      +
    973A  SER*     1.3    58.3    +      -       -      +
    975A  ARG*     3.1    24.7    +      -       -      +
    976A  VAL*     2.9    37.2    +      -       +      +
----------------------------------------------------------
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Residues in contact with SER 973 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    928A  HIS*     3.5    33.0    +      -       -      -
    969A  VAL*     2.7    29.0    +      -       -      +
    970A  ALA*     3.3     7.3    +      -       -      -
    972A  LEU*     1.3    77.5    -      -       -      +
    974A  GLU*     1.3    59.9    +      -       -      +
    976A  VAL*     3.8     0.5    -      -       -      +
    977A  LYS*     2.9    47.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 974 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    970A  ALA      3.3    14.9    +      -       -      +
    971A  THR*     3.6    15.6    -      -       -      +
    972A  LEU      3.2     0.2    -      -       -      -
    973A  SER*     1.3    83.9    +      -       -      +
    975A  ARG*     1.3    63.3    +      -       -      +
    977A  LYS*     3.4    13.6    +      -       -      +
    978A  LEU*     3.5    19.6    +      -       +      +
----------------------------------------------------------
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Residues in contact with ARG 975 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    961A  VAL*     3.6    17.5    -      -       +      +
    962A  PRO*     2.9    38.8    +      -       +      -
    964A  LYS*     3.7    32.7    -      -       -      +
    967A  ASP*     2.8    43.8    +      -       -      -
    971A  THR*     3.2    14.2    +      -       -      +
    972A  LEU*     3.1    17.9    +      -       -      +
    974A  GLU*     1.3    79.7    -      -       -      +
    976A  VAL*     1.3    63.4    +      -       -      +
    978A  LEU*     3.2    30.2    +      -       +      +
    979A  ALA      3.8     2.1    +      -       -      -
----------------------------------------------------------
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Residues in contact with VAL 976 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    916A  PRO*     4.2     2.2    -      -       +      -
    928A  HIS*     3.8    24.2    -      -       +      -
    939A  THR*     4.0    19.7    -      -       +      -
    940A  GLY*     3.6    22.9    -      -       -      +
    941A  CYS*     3.9    11.7    -      -       +      -
    961A  VAL*     3.9    24.2    -      -       +      -
    972A  LEU*     2.9    22.6    +      -       +      +
    973A  SER      4.0     1.1    -      -       -      +
    975A  ARG*     1.3    74.4    -      -       -      +
    977A  LYS*     1.3    60.4    +      -       -      +
    979A  ALA*     3.0     5.9    +      -       -      +
    980A  GLU*     2.9    36.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 977 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    817A  THR*     5.0     8.1    +      -       -      +
    819A  SER*     3.7    14.9    +      -       -      +
    820A  ASN*     5.2     0.4    -      -       -      +
    973A  SER*     2.9    32.4    +      -       -      +
    974A  GLU*     3.8     7.9    -      -       -      +
    975A  ARG      3.3     0.4    -      -       -      -
    976A  VAL*     1.3    77.9    -      -       -      +
    978A  LEU*     1.3    62.7    +      -       +      +
    980A  GLU*     3.7    21.1    -      -       -      +
    981A  HIS*     3.0    43.1    +      -       +      +
   1101A  GAR      3.3    48.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 978 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    974A  GLU*     3.5    17.2    +      -       +      +
    975A  ARG*     3.2    20.3    +      -       +      +
    976A  VAL      3.2     0.6    -      -       -      -
    977A  LYS*     1.3    80.2    -      -       +      +
    979A  ALA*     1.3    60.5    +      -       -      +
    981A  HIS*     3.6    15.6    +      -       +      +
    982A  LYS*     3.5    27.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 979 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    941A  CYS*     3.7    12.6    -      -       -      -
    959A  GLU*     3.5    34.7    -      -       +      +
    961A  VAL*     3.7    23.8    -      -       +      -
    975A  ARG      3.8     0.8    +      -       -      +
    976A  VAL      3.0     9.6    +      -       -      +
    978A  LEU*     1.3    76.4    -      -       -      +
    980A  GLU*     1.3    65.1    +      -       -      +
    981A  HIS      3.1     1.8    -      -       -      -
    982A  LYS*     2.9    14.7    +      -       -      +
    983A  ILE*     3.0    15.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 980 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    820A  ASN*     2.8    36.4    +      -       -      +
    914A  ILE*     3.6    12.1    -      -       +      +
    916A  PRO*     3.7    12.7    -      -       -      +
    928A  HIS*     5.0     0.7    +      -       -      -
    941A  CYS*     3.5    23.8    -      -       +      -
    973A  SER      5.0     0.2    -      -       -      +
    976A  VAL*     2.9    22.4    +      -       -      +
    977A  LYS*     3.6    19.8    -      -       -      +
    979A  ALA*     1.3    76.0    -      -       -      +
    981A  HIS*     1.3    58.2    +      -       +      +
    982A  LYS      3.1     0.2    -      -       -      -
    983A  ILE*     4.2     0.2    -      -       -      -
    984A  PHE*     3.0    36.0    +      -       -      +
   1101A  GAR      2.7    43.3    +      -       -      -
----------------------------------------------------------
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Residues in contact with HIS 981 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    819A  SER*     2.8    50.5    +      -       -      -
    820A  ASN*     3.5    20.2    +      -       -      -
    823A  ALA*     3.7    19.8    -      -       +      +
    977A  LYS*     3.0    30.9    +      -       +      +
    978A  LEU*     3.9    14.0    -      -       +      +
    979A  ALA      3.1     0.4    -      -       -      -
    980A  GLU*     1.3    75.8    -      -       +      +
    982A  LYS*     1.3    59.5    +      -       +      +
    985A  PRO*     3.2    21.5    -      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 982 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    959A  GLU*     3.9    28.4    +      -       -      +
    978A  LEU*     3.5    21.5    -      -       -      +
    979A  ALA      2.9     6.5    +      -       -      +
    981A  HIS*     1.3    81.3    -      -       +      +
    983A  ILE*     1.3    65.6    +      -       +      +
    984A  PHE      3.4     0.4    -      -       -      -
    985A  PRO*     3.5     4.2    -      -       -      +
    986A  ALA*     3.2    22.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 983 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    914A  ILE*     4.0     2.5    -      -       +      -
    941A  CYS*     3.5    42.0    -      -       -      +
    942A  THR      3.9     0.4    -      -       -      +
    943A  VAL*     3.7    20.0    -      -       +      +
    957A  LEU*     3.7    28.0    -      -       +      +
    958A  GLN*     4.0     9.9    -      -       -      +
    959A  GLU*     3.7    31.4    -      -       +      +
    979A  ALA      3.0    15.8    +      -       -      +
    980A  GLU      4.0     2.9    -      -       -      +
    982A  LYS*     1.3    75.5    -      -       +      +
    984A  PHE*     1.3    62.8    +      -       -      +
    986A  ALA*     4.2     5.8    -      -       +      -
    987A  ALA*     2.8    31.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with PHE 984 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    820A  ASN*     3.9    13.5    -      -       +      +
    824A  LEU*     3.8    19.1    -      -       +      -
    891A  CYS*     3.7    34.5    -      -       +      -
    892A  LEU      3.4    25.8    -      -       -      -
    893A  ALA*     3.9    12.3    -      -       +      -
    912A  LEU*     3.9    25.1    -      -       +      -
    914A  ILE*     3.6    29.6    -      -       +      -
    943A  VAL*     3.8    22.9    -      -       +      -
    980A  GLU      3.0    17.8    +      -       -      +
    983A  ILE*     1.3    77.9    -      -       -      +
    985A  PRO*     1.3    68.7    -      -       +      +
    988A  LEU*     2.9    22.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with PRO 985 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    823A  ALA*     3.7    27.1    -      -       +      +
    824A  LEU*     3.7    13.0    -      -       +      -
    827A  SER*     3.4    26.9    +      -       -      +
    980A  GLU      3.9     0.2    -      -       -      +
    981A  HIS*     3.2    30.7    -      -       -      +
    982A  LYS      3.5     5.8    -      -       -      +
    984A  PHE*     1.3    93.8    -      -       +      +
    986A  ALA*     1.3    61.2    +      -       -      +
    988A  LEU*     3.4     2.8    +      -       +      +
    989A  GLN*     3.0    23.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 986 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    957A  LEU*     3.6    20.4    -      -       +      -
    982A  LYS      3.2    16.2    +      -       -      +
    983A  ILE*     3.8     2.0    -      -       -      +
    984A  PHE      3.2     1.0    -      -       -      -
    985A  PRO*     1.3    79.6    -      -       -      +
    987A  ALA*     1.3    57.7    +      -       -      +
    989A  GLN*     3.3     6.8    +      -       -      +
    990A  LEU*     3.0    32.3    +      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 987 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    912A  LEU*     4.0     3.8    -      -       +      -
    943A  VAL*     3.6    33.4    -      -       +      -
    956A  ILE*     3.9    18.6    -      -       +      -
    957A  LEU*     3.6     9.8    -      -       +      +
    983A  ILE      2.8    18.1    +      -       -      +
    984A  PHE      3.7     1.6    -      -       -      +
    986A  ALA*     1.3    73.3    -      -       -      +
    988A  LEU*     1.3    68.4    +      -       -      +
    990A  LEU*     3.2     5.6    +      -       -      +
    991A  VAL*     3.0    26.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 988 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    810A  VAL*     4.0    18.6    -      -       +      -
    824A  LEU*     3.9    21.5    -      -       +      -
    827A  SER*     5.4     0.7    -      -       -      +
    828A  THR*     3.8    28.7    -      -       +      -
    835A  ALA*     4.0    12.1    -      -       +      -
    837A  ILE*     5.4     0.9    -      -       +      -
    889A  ILE*     3.9    24.0    -      -       +      -
    891A  CYS*     3.9    27.6    -      -       -      -
    912A  LEU*     4.0     9.6    -      -       +      +
    984A  PHE*     2.9    17.0    +      -       +      +
    985A  PRO      3.8     4.3    -      -       -      +
    987A  ALA*     1.3    76.0    -      -       -      +
    989A  GLN*     1.3    57.8    +      -       -      +
    991A  VAL*     3.3     1.5    +      -       +      +
    992A  ALA*     2.8    32.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLN 989 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    832A  ASN      3.8    10.3    +      -       -      -
    833A  SER*     3.6     9.2    +      -       -      -
    834A  SER*     2.8    47.2    +      -       -      +
    835A  ALA*     4.3     2.2    +      -       -      +
    985A  PRO      3.0    18.1    +      -       -      +
    986A  ALA*     3.6     7.0    -      -       -      +
    987A  ALA      3.2     0.2    -      -       -      -
    988A  LEU*     1.3    78.2    -      -       -      +
    990A  LEU*     1.3    60.5    +      -       +      +
    992A  ALA*     4.5     2.7    -      -       -      +
    993A  SER*     2.8    41.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 990 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    956A  ILE*     4.5     3.8    -      -       +      -
    957A  LEU*     4.1    26.2    -      -       +      -
    986A  ALA*     3.0    19.8    +      -       +      +
    987A  ALA*     3.2     9.4    +      -       -      +
    989A  GLN*     1.3    79.1    -      -       +      +
    991A  VAL*     1.3    60.4    +      -       +      +
    993A  SER*     3.2     4.0    +      -       -      -
    995A  THR*     2.9    54.4    +      -       +      +
    996A  VAL*     3.1    18.8    +      -       +      -
   1006A  TRP*     3.6    34.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with VAL 991 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    889A  ILE*     3.9    20.8    -      -       +      +
    909A  GLY      4.5     7.6    -      -       -      +
    912A  LEU*     4.1    19.5    -      -       +      -
    945A  PHE*     3.8    31.0    -      -       +      -
    956A  ILE*     4.1    14.6    -      -       +      -
    987A  ALA      3.0    16.9    +      -       -      +
    988A  LEU*     4.0     2.5    -      -       -      +
    990A  LEU*     1.3    74.8    -      -       +      +
    992A  ALA*     1.3    66.2    +      -       -      +
    994A  GLY*     3.0    14.4    +      -       -      -
    996A  VAL*     3.7    20.5    -      -       +      +
    997A  GLN*     6.0     0.4    -      -       -      -
----------------------------------------------------------
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Residues in contact with ALA 992 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    808A  ALA*     3.9    18.5    +      -       +      +
    834A  SER*     3.7    29.7    -      -       -      +
    835A  ALA*     3.8    18.4    -      -       +      -
    889A  ILE*     3.7    15.0    -      -       +      +
    988A  LEU      2.8    22.4    +      -       -      +
    989A  GLN*     4.2     1.6    -      -       -      +
    991A  VAL*     1.3    74.0    -      -       -      +
    993A  SER*     1.3    59.0    +      -       -      +
    994A  GLY      3.2     0.6    +      -       -      -
----------------------------------------------------------
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Residues in contact with SER 993 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    834A  SER*     3.7    19.9    -      -       -      -
    989A  GLN*     2.8    31.4    +      -       -      +
    990A  LEU*     3.2     4.7    +      -       -      +
    992A  ALA*     1.3    76.1    -      -       -      +
    994A  GLY*     1.3    60.6    +      -       -      +
    995A  THR*     2.8    27.7    +      -       -      -
----------------------------------------------------------
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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