Contacts of the helix formed by residues 917 - 942 (chain A) in PDB entry 4FUL


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 917 (chain A).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    915A  SER*     3.4     8.1    -      -       -      -
    916A  PRO*     1.4    83.7    -      -       +      +
    918A  GLU*     1.4    59.4    +      -       -      +
    919A  GLU*     3.8    10.8    +      -       -      +
    920A  LYS*     3.2    30.1    +      -       +      +
    921A  PHE*     3.0    21.6    +      -       -      -
----------------------------------------------------------
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Residues in contact with GLU 918 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    912A  LYS*     3.3    31.1    -      -       -      +
    917A  THR*     1.4    69.7    -      -       -      +
    919A  GLU*     1.3    55.8    +      -       -      +
    921A  PHE*     3.1    16.5    +      -       -      +
    922A  GLN*     2.9    64.1    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLU 919 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    917A  THR*     3.8    10.5    +      -       -      +
    918A  GLU*     1.3    77.2    -      -       -      +
    920A  LYS*     1.4    63.8    +      -       +      +
    922A  GLN*     3.4     6.9    +      -       -      +
    923A  ALA*     3.2    21.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 920 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    915A  SER*     4.1     2.9    -      -       -      -
    916A  PRO*     3.8    34.6    -      -       +      +
    917A  THR*     3.2    23.9    +      -       +      +
    919A  GLU*     1.4    83.1    -      -       +      +
    921A  PHE*     1.4    56.0    +      -       -      +
    923A  ALA*     3.3    10.5    +      -       +      +
    924A  ALA*     3.0    28.2    +      -       -      +
    957A  THR*     5.7     0.7    +      -       -      -
----------------------------------------------------------
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Residues in contact with PHE 921 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    908A  ASN*     3.5    25.4    -      -       -      -
    911A  LEU*     3.7    20.0    -      -       +      -
    912A  LYS*     3.3    59.5    -      -       +      -
    915A  SER*     3.3    20.8    +      -       -      +
    917A  THR      3.0     9.5    +      -       -      +
    918A  GLU*     3.1    28.9    +      -       -      +
    920A  LYS*     1.4    73.7    -      -       -      +
    922A  GLN*     1.3    82.2    +      -       -      +
    924A  ALA*     3.4     2.8    +      -       +      +
    925A  VAL*     3.2    37.1    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLN 922 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    918A  GLU*     2.9    40.4    +      -       +      +
    919A  GLU*     3.8     7.0    -      -       -      +
    920A  LYS      3.4     0.2    -      -       -      -
    921A  PHE*     1.3    93.0    -      -       -      +
    923A  ALA*     1.4    58.4    +      -       -      +
    925A  VAL*     3.4     8.9    +      -       -      +
    926A  GLU*     3.1    26.9    +      -       -      +
   1005A  HIS*     4.7    16.1    +      -       -      -
----------------------------------------------------------
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Residues in contact with ALA 923 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    919A  GLU      3.2    12.7    +      -       -      +
    920A  LYS*     3.4    14.8    -      -       +      +
    922A  GLN*     1.4    76.1    -      -       -      +
    924A  ALA*     1.4    49.8    +      -       -      +
    926A  GLU*     3.3    10.0    -      -       -      +
    927A  ARG*     2.8    34.2    +      -       -      +
    957A  THR*     5.0     0.9    -      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 924 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    911A  LEU*     4.9    10.0    -      -       +      +
    915A  SER*     4.5     7.0    -      -       -      +
    920A  LYS      3.0    13.3    +      -       -      +
    921A  PHE*     3.5    16.6    -      -       +      +
    922A  GLN      3.3     0.2    -      -       -      -
    923A  ALA*     1.4    73.8    -      -       -      +
    925A  VAL*     1.4    54.8    +      -       -      +
    927A  ARG      3.3     0.3    +      -       -      -
    928A  PHE*     2.8    29.6    +      -       -      +
    956A  GLU      4.8     2.7    -      -       -      +
    957A  THR*     3.4    32.5    +      -       -      +
    958A  GLY*     3.4    14.1    -      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 925 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    908A  ASN*     4.8     0.7    -      -       -      +
    911A  LEU*     5.2     2.2    -      -       +      -
    921A  PHE*     3.2    45.5    +      -       +      +
    922A  GLN*     3.4    12.1    +      -       -      +
    924A  ALA*     1.4    73.4    -      -       -      +
    926A  GLU*     1.4    58.8    +      -       -      +
    928A  PHE*     3.3     7.2    +      -       -      +
    929A  VAL*     2.9    37.0    +      -       +      +
    994A  VAL*     3.5    37.2    -      -       +      +
   1005A  HIS*     3.6    31.6    -      -       +      +
----------------------------------------------------------
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Residues in contact with GLU 926 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    922A  GLN      3.1    14.1    +      -       -      +
    923A  ALA*     3.3    13.5    -      -       -      +
    925A  VAL*     1.4    72.6    -      -       -      +
    927A  ARG*     1.4    63.7    +      -       -      +
    929A  VAL*     3.3     6.5    +      -       -      +
    930A  TYR*     3.0    49.9    +      -       +      -
   1005A  HIS*     5.1    11.6    +      -       +      -
   1008A  LYS*     3.0    38.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 927 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    298A  LYS      5.4     4.8    +      -       -      -
    299A  ASN*     3.3    26.1    +      -       -      +
    861A  ASP*     5.3     2.6    +      -       -      -
    863A  CYS*     3.7    28.4    -      -       +      +
    865A  LEU*     5.3     4.6    -      -       -      +
    923A  ALA      2.8    17.0    +      -       -      +
    924A  ALA      3.3     1.3    +      -       -      +
    926A  GLU*     1.4    71.6    -      -       -      +
    928A  PHE*     1.4    52.7    +      -       -      +
    930A  TYR*     3.5     5.3    +      -       -      +
    931A  SER*     2.8    37.1    +      -       -      -
    957A  THR*     3.4    40.3    -      -       -      +
    958A  GLY      3.6     2.5    -      -       -      -
    959A  ASN*     3.2    40.4    +      -       +      +
----------------------------------------------------------
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Residues in contact with PHE 928 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    907A  LEU*     3.8    15.5    -      -       +      -
    911A  LEU*     4.8     2.2    -      -       +      -
    924A  ALA      2.8    17.4    +      -       -      +
    925A  VAL*     3.5     8.7    -      -       -      +
    926A  GLU      3.3     0.2    -      -       -      -
    927A  ARG*     1.4    73.2    -      -       -      +
    929A  VAL*     1.3    62.0    +      -       -      +
    931A  SER*     3.5     1.3    +      -       -      -
    932A  CYS*     2.8    40.0    +      -       +      +
    954A  ILE*     3.5    20.0    -      -       +      -
    958A  GLY*     3.1    13.6    +      -       -      +
    960A  LEU*     3.5    28.9    -      -       +      -
    991A  PHE*     3.4    54.7    -      +       +      -
    994A  VAL*     3.8    21.3    -      -       +      -
    995A  MET*     3.6    22.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with VAL 929 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    925A  VAL*     2.9    26.6    +      -       +      +
    926A  GLU*     3.3     8.7    +      -       -      +
    928A  PHE*     1.3    76.3    -      -       +      +
    930A  TYR*     1.3    62.6    +      -       +      +
    932A  CYS*     4.7     1.3    -      -       -      -
    933A  ALA*     3.3    21.8    +      -       -      +
    995A  MET*     3.9    28.5    -      -       +      -
   1005A  HIS*     3.8    37.9    -      -       +      +
   1008A  LYS*     4.4     9.2    -      -       +      -
   1009A  PHE*     3.6    14.7    -      -       +      +
   1012A  ILE*     3.7    22.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with TYR 930 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    861A  ASP      3.3    22.9    -      -       -      +
    862A  LEU*     3.3    11.0    -      -       +      +
    863A  CYS*     3.8    21.3    -      -       -      -
    926A  GLU*     3.0    58.5    +      -       +      +
    927A  ARG*     3.9     0.7    -      -       -      +
    929A  VAL*     1.3    75.2    -      -       +      +
    931A  SER*     1.4    59.0    +      -       -      +
    933A  ALA*     3.4     6.0    +      -       -      +
    934A  GLY      3.0    23.6    +      -       -      -
   1008A  LYS*     3.4    20.9    +      -       +      -
   1012A  ILE*     3.6    40.7    -      -       +      +
----------------------------------------------------------
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Residues in contact with SER 931 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    862A  LEU      3.4     9.0    -      -       -      -
    863A  CYS*     3.4     9.6    -      -       -      +
    927A  ARG      2.8    27.1    +      -       -      -
    928A  PHE      3.5     2.8    +      -       -      -
    930A  TYR*     1.4    70.0    -      -       -      +
    932A  CYS*     1.3    60.8    +      -       -      +
    934A  GLY*     3.5     0.7    +      -       -      -
    935A  TYR*     3.0    37.7    +      -       -      -
    958A  GLY      3.6     2.3    +      -       -      -
    959A  ASN*     3.3    26.1    +      -       -      -
    960A  LEU*     2.9    29.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with CYS 932 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    928A  PHE*     2.8    26.1    +      -       +      +
    929A  VAL      4.0     2.9    -      -       -      +
    931A  SER*     1.3    77.0    +      -       -      +
    933A  ALA*     1.3    50.6    +      -       -      +
    935A  TYR*     3.2     1.9    +      -       -      +
    936A  CYS*     2.8    44.6    +      -       -      -
    960A  LEU*     3.6    16.7    -      -       +      +
    987A  LEU*     3.9     6.5    -      -       -      -
    991A  PHE*     3.8    28.3    -      -       -      -
    995A  MET*     3.7    26.0    -      -       +      -
   1009A  PHE*     3.7    10.8    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 933 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    862A  LEU*     4.1     2.7    -      -       +      -
    929A  VAL      3.3    12.7    +      -       -      +
    930A  TYR      3.4     9.0    -      -       -      +
    932A  CYS*     1.3    76.9    -      -       -      +
    934A  GLY*     1.3    61.6    +      -       -      +
    936A  CYS*     3.2     2.5    +      -       -      +
    937A  VAL*     3.0    29.7    +      -       -      +
   1009A  PHE*     3.4    16.0    -      -       +      -
   1012A  ILE*     3.7    25.4    -      -       +      -
   1013A  CYS*     3.6    20.9    -      -       -      +
----------------------------------------------------------
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Residues in contact with GLY 934 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    855A  TRP*     3.7     8.5    -      -       -      -
    862A  LEU*     3.5    30.4    -      -       -      +
    864A  LEU*     3.6    13.2    -      -       -      -
    930A  TYR      3.0    11.8    +      -       -      -
    931A  SER      3.8     3.4    -      -       -      -
    933A  ALA*     1.3    75.2    -      -       -      +
    935A  TYR*     1.4    55.3    +      -       -      +
    937A  VAL      3.5     0.2    +      -       -      -
    938A  ALA*     3.1    29.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with TYR 935 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    848A  LEU*     4.1    23.0    -      -       +      +
    863A  CYS      4.5     0.4    -      -       -      -
    864A  LEU*     3.6    27.7    -      -       +      +
    865A  LEU*     2.7    38.9    +      -       -      -
    866A  PRO*     3.9     1.6    -      -       -      +
    931A  SER      3.0    27.6    +      -       -      +
    932A  CYS      3.9     2.7    -      -       -      +
    934A  GLY*     1.4    71.6    -      -       -      +
    936A  CYS*     1.4    56.1    +      -       -      +
    938A  ALA*     4.4     3.1    -      -       +      -
    939A  THR*     2.7    49.0    +      -       +      +
    960A  LEU*     3.3    31.6    -      -       +      -
    961A  PHE*     3.5    11.3    -      -       +      +
    962A  HIS*     3.7    49.7    +      +       +      +
    965A  PHE*     5.1     0.7    -      +       -      -
----------------------------------------------------------
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Residues in contact with CYS 936 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    932A  CYS*     2.8    40.6    +      -       -      +
    933A  ALA*     3.2     7.4    +      -       -      +
    935A  TYR*     1.4    71.9    -      -       -      +
    937A  VAL*     1.3    59.2    +      -       -      +
    939A  THR*     4.2     0.2    -      -       -      -
    940A  PHE*     3.1    27.2    +      -       -      +
    960A  LEU*     6.1     0.9    -      -       -      -
    962A  HIS*     6.3     0.7    -      -       -      -
    985A  PHE*     3.4    47.7    -      -       +      -
    986A  VAL      3.5    20.6    -      -       -      -
    987A  LEU*     4.5     1.3    -      -       -      -
   1009A  PHE*     4.2     7.4    -      -       -      -
   1013A  CYS*     4.6     7.6    -      -       -      -
   1068A  PHE*     3.8     1.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with VAL 937 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    855A  TRP*     4.4     6.3    -      -       +      -
    933A  ALA      3.0    21.3    +      -       -      +
    934A  GLY      4.1     2.5    -      -       -      +
    936A  CYS*     1.3    75.9    -      -       -      +
    938A  ALA*     1.3    58.2    +      -       -      +
    940A  PHE*     3.3     2.8    +      -       -      +
    941A  VAL*     2.9    34.7    +      -       +      +
   1013A  CYS*     3.5    29.8    -      -       -      +
   1016A  ALA*     4.1     7.6    -      -       +      -
   1017A  TYR*     3.7    37.7    -      -       +      +
   1020A  LEU*     3.9    18.6    -      -       +      -
   1068A  PHE*     3.6    18.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 938 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    848A  LEU*     3.6    28.9    -      -       +      -
    851A  MET*     3.7    20.2    -      -       -      -
    855A  TRP*     4.5     5.5    -      -       +      -
    864A  LEU*     4.9     4.5    -      -       +      -
    934A  GLY      3.1    19.6    +      -       -      +
    935A  TYR*     4.0     5.4    -      -       +      +
    937A  VAL*     1.3    75.0    -      -       -      +
    939A  THR*     1.4    58.5    +      -       +      +
    941A  VAL*     3.3     3.9    +      -       -      +
    942A  LEU*     3.0    36.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with THR 939 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    848A  LEU*     5.9     2.9    -      -       +      -
    935A  TYR*     2.7    37.7    +      -       +      +
    936A  CYS*     4.1     2.1    +      -       -      -
    938A  ALA*     1.4    70.3    -      -       +      +
    940A  PHE*     1.3    65.4    +      -       -      +
    942A  LEU      3.4     0.3    +      -       -      -
    943A  GLY      3.0     3.5    +      -       -      -
    944A  ILE*     2.9    52.5    +      -       +      +
    945A  GLY*     3.2    23.3    +      -       -      -
    962A  HIS*     3.7    36.1    -      -       +      +
    965A  PHE*     5.1     1.3    -      -       +      -
    985A  PHE*     4.2     5.4    -      -       -      +
----------------------------------------------------------
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Residues in contact with PHE 940 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    936A  CYS      3.1    20.2    +      -       -      +
    937A  VAL      3.3     2.6    +      -       -      +
    938A  ALA      3.3     0.6    -      -       -      -
    939A  THR*     1.3    80.4    +      -       -      +
    941A  VAL*     1.3    64.5    +      -       -      +
    943A  GLY      3.1     4.2    +      -       -      -
    945A  GLY      4.8     0.2    -      -       -      +
    984A  PRO*     3.8    37.6    +      -       +      -
    985A  PHE*     3.7    13.0    -      +       +      -
   1017A  TYR*     4.2     9.6    -      +       -      -
   1050A  TYR*     2.8    40.2    +      +       -      -
   1054A  ALA*     3.5    28.9    -      -       +      +
   1067A  TYR*     3.5    35.9    -      +       -      -
   1068A  PHE*     3.6    21.3    -      +       +      -
   1071A  GLN*     4.2    11.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with VAL 941 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    851A  MET*     3.8    20.2    -      -       +      -
    937A  VAL*     2.9    30.9    +      -       +      +
    938A  ALA      3.6     4.5    -      -       -      +
    940A  PHE*     1.3    73.0    -      -       +      +
    942A  LEU*     1.4    57.0    +      -       +      +
   1017A  TYR*     4.5    12.6    -      -       +      -
   1020A  LEU*     3.8    20.0    -      -       +      -
   1027A  LEU*     4.7     3.1    -      -       +      -
   1050A  TYR*     3.4    15.6    -      -       -      -
   1051A  ILE*     3.5    37.6    -      -       +      +
   1054A  ALA*     4.0     9.3    -      -       -      +
   1055A  LEU*     4.3    25.6    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 942 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    844A  ILE*     4.3    21.8    -      -       +      -
    847A  ILE*     4.0    39.0    -      -       +      -
    848A  LEU*     4.3    16.4    -      -       +      -
    851A  MET*     3.9    14.6    -      -       +      -
    938A  ALA      3.0    17.2    +      -       -      +
    939A  THR      3.4     0.2    +      -       -      -
    940A  PHE      3.2     0.2    -      -       -      -
    941A  VAL*     1.4    75.2    -      -       -      +
    943A  GLY*     1.3    62.1    +      -       -      +
    944A  ILE*     3.2    26.2    +      -       +      +
   1027A  LEU*     5.8     0.4    -      -       +      -
   1031A  PHE*     3.3    45.8    -      -       +      -
   1034A  MET*     4.8     1.7    -      -       +      +
   1050A  TYR*     4.1     1.3    -      -       -      -
   1051A  ILE*     4.2     8.7    -      -       +      -
----------------------------------------------------------
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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