Contacts of the helix formed by residues 922 - 947 (chain M) in PDB entry 3HOU


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 ASP 922 (chain M).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    901M  LEU*     4.3     1.4    -      -       -      +
    902M  LEU*     3.7     6.7    -      -       -      +
    918M  GLU      5.1     5.2    -      -       -      +
    919M  ILE*     2.9    22.3    +      -       -      +
    920M  LEU      3.2     1.6    +      -       -      -
    921M  GLY*     1.3    74.6    -      -       -      +
    923M  LEU*     1.3    61.4    +      -       -      +
    924M  LYS*     2.9    23.9    +      -       -      +
    925M  LEU*     3.0    35.5    +      -       +      +
    926M  GLN*     3.4    16.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 923 (chain M). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    902M  LEU*     3.3    40.4    -      -       +      -
    921M  GLY      2.9     9.9    +      -       -      +
    922M  ASP*     1.3    73.2    +      -       -      +
    924M  LYS*     1.3    64.9    +      -       +      +
    925M  LEU      3.3     0.5    +      -       -      -
    926M  GLN*     3.4     9.2    +      -       +      +
    927M  VAL*     3.1    17.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 924 (chain M). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    922M  ASP*     2.9     9.0    +      -       -      +
    923M  LEU*     1.3    79.3    -      -       +      +
    925M  LEU*     1.3    63.1    +      -       +      +
    927M  VAL*     3.2    29.7    -      -       -      +
    928M  LEU*     4.1     7.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 925 (chain M). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    901M  LEU*     3.3    15.0    -      -       +      -
    919M  ILE*     3.1    44.0    -      -       +      -
    922M  ASP*     3.0    27.8    +      -       -      +
    924M  LYS*     1.3    77.0    -      -       +      +
    926M  GLN*     1.3    54.2    +      -       -      +
    927M  VAL      2.8     5.4    -      -       -      -
    928M  LEU*     2.6    36.6    +      -       +      +
    929M  LEU*     2.8    15.7    +      -       +      +
    982M  THR*     6.0     3.1    -      -       +      -
    983M  ILE*     4.0    16.8    -      -       +      -
    984M  LYS*     4.8    17.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLN 926 (chain M). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    898M  ARG*     4.5     1.0    +      -       -      -
    899M  VAL      3.3    13.0    +      -       -      +
    900M  ASP*     3.4    15.2    -      -       -      +
    901M  LEU*     2.7    48.9    +      -       +      +
    902M  LEU*     3.3    41.3    -      -       +      +
    922M  ASP      3.4     2.7    +      -       -      +
    923M  LEU*     3.4    10.1    +      -       +      +
    925M  LEU*     1.3    76.2    -      -       -      +
    927M  VAL*     1.3    56.6    +      -       -      +
    928M  LEU      3.2     0.2    -      -       -      -
    929M  LEU*     3.4     9.1    -      -       -      +
    930M  ASP*     2.8    60.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 927 (chain M). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    923M  LEU      3.1    19.7    -      -       -      +
    924M  LYS*     3.2    30.3    -      -       -      +
    925M  LEU      2.7     0.8    +      -       -      -
    926M  GLN*     1.3    77.9    -      -       -      +
    928M  LEU*     1.3    61.1    +      -       +      +
    930M  ASP*     4.1     3.2    -      -       -      +
    931M  GLU*     3.0    32.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 928 (chain M). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    924M  LYS      4.5     7.6    -      -       -      +
    925M  LEU*     2.6    23.2    +      -       +      +
    927M  VAL*     1.3    73.5    -      -       +      +
    929M  LEU*     1.3    60.2    +      -       +      +
    930M  ASP      3.0     1.1    -      -       -      -
    931M  GLU*     2.8    28.4    +      -       -      +
    932M  GLU*     2.7    36.9    +      -       -      +
    983M  ILE*     5.4     1.1    -      -       +      +
    984M  LYS*     4.1    40.4    -      -       +      -
    987M  VAL*     4.5    27.6    -      -       +      +
    988M  LEU*     4.7    11.2    -      -       +      -
    991M  LYS*     6.0     0.2    -      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 929 (chain M). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    898M  ARG*     4.1     1.8    +      -       -      -
    899M  VAL*     3.2    44.4    +      -       +      +
    901M  LEU*     4.2     1.1    -      -       +      -
    925M  LEU      2.8    21.5    +      -       -      +
    926M  GLN*     3.4    29.2    -      -       -      +
    928M  LEU*     1.3    76.0    -      -       +      +
    930M  ASP*     1.3    58.5    +      -       -      +
    932M  GLU*     3.7    11.1    -      -       -      +
    933M  TYR*     3.0    28.6    +      -       -      +
    983M  ILE*     3.2    42.4    -      -       +      -
    987M  VAL*     5.1     4.0    -      -       +      -
   1028M  THR*     4.4    14.8    -      -       +      +
----------------------------------------------------------
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Residues in contact with ASP 930 (chain M). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    898M  ARG*     2.6    43.9    +      -       -      +
    902M  LEU*     5.6     1.9    -      -       -      +
    926M  GLN*     2.8    41.5    +      -       -      +
    927M  VAL*     4.1     3.8    -      -       -      +
    929M  LEU*     1.3    75.0    -      -       -      +
    931M  GLU*     1.3    65.7    +      -       -      +
    932M  GLU      3.2     0.4    -      -       -      -
    933M  TYR*     3.9     0.9    -      -       -      +
    934M  LYS*     3.0    35.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 931 (chain M). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    927M  VAL*     3.0    23.4    +      -       -      +
    928M  LEU*     2.8    29.2    +      -       -      +
    930M  ASP*     1.3    75.8    -      -       -      +
    932M  GLU*     1.3    62.4    +      -       -      +
    934M  LYS*     3.4    12.5    +      -       -      +
    935M  GLN*     3.2    20.8    +      -       -      +
    991M  LYS*     2.9    33.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 932 (chain M). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    897M  TYR      4.1    14.7    -      -       -      +
    899M  VAL*     5.3     0.2    -      -       -      +
    928M  LEU      2.7    19.4    +      -       -      +
    929M  LEU*     3.7    13.8    -      -       -      +
    931M  GLU*     1.3    69.3    -      -       -      +
    933M  TYR*     1.3    66.0    +      -       -      +
    934M  LYS      3.0     5.0    +      -       -      -
    935M  GLN*     3.0    17.1    +      -       -      +
    936M  LEU*     3.0    26.6    +      -       +      +
    986M  ILE*     5.0     0.3    -      -       -      +
    987M  VAL*     3.0    24.2    -      -       +      +
   1026M  LEU      4.9     1.9    -      -       -      +
   1027M  ALA*     4.2     9.6    -      -       -      +
   1028M  THR*     2.7    48.1    +      -       -      -
   1029M  ARG      4.5     0.2    +      -       -      -
----------------------------------------------------------
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Residues in contact with TYR 933 (chain M). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    893M  PHE*     3.6    25.0    -      +       -      -
    894M  GLU*     3.2    33.3    -      -       +      +
    897M  TYR*     3.5    15.9    -      -       +      +
    898M  ARG*     3.3    68.0    -      -       +      +
    899M  VAL      5.5     0.7    -      -       -      +
    929M  LEU      3.0    16.0    +      -       -      +
    930M  ASP      4.3     1.6    -      -       -      +
    932M  GLU*     1.3    79.8    -      -       +      +
    934M  LYS*     1.3    61.2    +      -       -      +
    936M  LEU*     4.0     8.7    -      -       +      -
    937M  VAL*     3.3    26.0    +      -       +      +
----------------------------------------------------------
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Residues in contact with LYS 934 (chain M). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    930M  ASP*     3.0    27.1    +      -       -      +
    931M  GLU*     3.4    11.6    -      -       -      +
    932M  GLU      3.0     1.0    +      -       -      -
    933M  TYR*     1.3    76.1    -      -       -      +
    935M  GLN*     1.3    60.7    +      -       -      +
    937M  VAL*     2.9    30.2    -      -       +      +
    938M  LYS*     2.9    11.0    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLN 935 (chain M). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    931M  GLU      3.2     8.3    +      -       -      +
    932M  GLU*     3.0    10.5    +      -       -      +
    934M  LYS*     1.3    77.2    -      -       -      +
    936M  LEU*     1.3    69.9    +      -       +      +
    938M  LYS*     2.7    32.8    +      -       -      +
    939M  ASP*     2.7    46.9    +      -       -      -
   1023M  ARG*     3.1    37.1    -      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 936 (chain M). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    885M  THR*     3.7     9.1    -      -       +      +
    893M  PHE*     3.8    11.4    -      -       +      -
    897M  TYR*     3.1    52.9    -      -       +      +
    932M  GLU*     3.0    32.9    +      -       +      +
    933M  TYR*     4.0    10.8    -      -       -      +
    935M  GLN*     1.3    76.2    -      -       +      +
    937M  VAL*     1.3    58.3    +      -       -      +
    939M  ASP*     3.3     9.1    +      -       -      +
    940M  ARG*     3.0    26.0    +      -       -      +
   1023M  ARG*     3.9    35.0    -      -       +      +
   1024M  SER*     5.7     0.4    -      -       -      -
   1027M  ALA*     3.9    11.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with VAL 937 (chain M). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    893M  PHE*     3.7    26.7    -      -       +      -
    933M  TYR*     3.3    20.6    +      -       +      +
    934M  LYS*     2.9    26.0    -      -       +      +
    935M  GLN      3.1     0.6    -      -       -      -
    936M  LEU*     1.3    77.5    -      -       -      +
    938M  LYS*     1.3    66.2    +      -       +      +
    940M  ARG*     3.4     4.3    -      -       -      +
    941M  LYS*     3.3    44.8    +      -       +      +
----------------------------------------------------------
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Residues in contact with LYS 938 (chain M). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    934M  LYS*     2.9    14.1    +      -       +      +
    935M  GLN*     2.7    39.5    +      -       -      +
    937M  VAL*     1.3    71.7    -      -       +      +
    939M  ASP*     1.3    70.6    +      -       -      +
    941M  LYS*     3.1     9.6    +      -       -      +
    942M  PHE*     2.9    23.7    +      -       +      +
----------------------------------------------------------
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Residues in contact with ASP 939 (chain M). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    885M  THR*     4.4     8.1    -      -       +      +
    935M  GLN*     2.7    31.3    +      -       -      +
    936M  LEU*     3.3    12.0    -      -       -      +
    938M  LYS*     1.3    73.7    -      -       -      +
    940M  ARG*     1.3    53.1    +      -       -      +
    942M  PHE*     2.7    29.4    +      -       -      +
    943M  LEU*     2.8    21.7    +      -       +      +
   1020M  CYS*     3.9    29.4    -      -       +      +
   1023M  ARG*     2.6    50.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 940 (chain M). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    885M  THR*     3.1    39.8    +      -       +      +
    886M  ILE*     4.5     3.3    -      -       -      +
    887M  GLY      3.3     4.8    +      -       -      -
    888M  GLY      2.3    34.6    +      -       -      -
    889M  SER      3.7    11.7    +      -       -      -
    890M  ASP*     2.9    24.7    +      -       -      +
    893M  PHE*     3.4    34.2    -      -       -      +
    936M  LEU      3.0     6.4    +      -       -      +
    937M  VAL      3.4    11.2    -      -       -      +
    939M  ASP*     1.3    78.4    -      -       -      +
    941M  LYS*     1.3    81.2    +      -       -      +
    943M  LEU*     4.0     4.5    -      -       -      +
    944M  ARG*     2.9    52.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 941 (chain M). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    890M  ASP*     4.4     6.2    +      -       -      -
    893M  PHE*     6.1     0.2    -      -       -      -
    937M  VAL*     3.3    35.7    +      -       +      +
    938M  LYS*     3.1     8.8    +      -       -      +
    940M  ARG*     1.3   119.6    -      -       -      +
    942M  PHE*     1.3    65.4    +      -       -      +
    944M  ARG*     3.2    15.1    +      -       +      +
    945M  GLU*     3.1    24.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with PHE 942 (chain M). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    938M  LYS*     2.9    16.4    +      -       +      +
    939M  ASP*     2.7    15.3    +      -       -      +
    941M  LYS*     1.3    73.7    -      -       -      +
    943M  LEU*     1.3    77.5    +      -       +      +
    945M  GLU*     3.1    20.4    -      -       -      +
    946M  VAL*     3.1    30.4    +      -       +      +
   1016M  THR*     3.9    20.4    -      -       +      -
   1017M  LEU*     5.3     0.9    -      -       +      -
   1020M  CYS*     4.4    10.8    -      -       -      -
    201Q  LYS*     4.0    12.1    -      -       +      -
    206Q  GLY*     3.7    19.7    -      -       -      -
    207Q  ARG*     3.4    44.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 943 (chain M). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    883M  LEU*     3.6    34.3    -      -       +      -
    885M  THR*     4.5     9.9    -      -       -      -
    886M  ILE*     3.6    36.0    -      -       +      +
    939M  ASP      2.8    23.6    +      -       -      +
    940M  ARG      4.0     2.5    -      -       -      +
    942M  PHE*     1.3    75.3    -      -       +      +
    944M  ARG*     1.3    58.6    +      -       -      +
    945M  GLU      2.8    10.2    +      -       -      -
    946M  VAL*     2.9     4.5    +      -       +      +
    947M  PHE*     2.8    30.4    +      -       +      +
   1017M  LEU*     3.8    26.9    -      -       +      -
   1020M  CYS*     3.9    24.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with ARG 944 (chain M). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    886M  ILE*     3.0    31.9    +      -       +      -
    887M  GLY      4.1     0.2    +      -       -      -
    888M  GLY      3.2     5.3    +      -       -      -
    890M  ASP*     5.1     0.6    +      -       -      -
    940M  ARG*     2.9    55.7    +      -       -      +
    941M  LYS*     3.2    14.9    +      -       -      +
    943M  LEU*     1.3    77.2    -      -       -      +
    945M  GLU*     1.3    57.1    +      -       -      +
    947M  PHE      4.4     2.5    -      -       -      -
    948M  VAL*     3.6    19.3    -      -       -      +
   1292M  PRO*     3.7    23.9    -      -       -      +
   1296M  GLY*     2.8    31.5    +      -       -      -
   1298M  TYR*     3.1    39.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 945 (chain M). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    941M  LYS*     3.1    14.0    +      -       -      +
    942M  PHE*     3.1    22.8    -      -       -      +
    943M  LEU      2.8     0.2    -      -       -      -
    944M  ARG*     1.3    80.2    -      -       -      +
    946M  VAL*     1.3    62.5    +      -       -      +
    948M  VAL*     3.9    14.7    -      -       -      +
    201Q  LYS*     2.5    37.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 946 (chain M). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    942M  PHE*     3.1    24.6    +      -       +      +
    943M  LEU*     2.9     9.2    +      -       +      +
    945M  GLU*     1.3    78.7    -      -       -      +
    947M  PHE*     1.3    91.7    +      -       +      +
    948M  VAL*     3.5     4.4    +      -       -      +
   1017M  LEU*     6.2     0.4    -      -       +      -
    201Q  LYS*     3.3    43.6    -      -       +      +
    202Q  SER      3.9    14.8    -      -       -      +
    203Q  GLU      4.8     0.4    -      -       -      +
    206Q  GLY*     3.5    13.0    -      -       -      +
----------------------------------------------------------
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Residues in contact with PHE 947 (chain M). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    883M  LEU*     4.2    18.4    -      -       +      -
    886M  ILE*     3.9    13.5    -      -       +      +
    943M  LEU*     2.8    18.0    +      -       +      +
    944M  ARG      4.2     1.5    -      -       -      +
    946M  VAL*     1.3   101.5    -      -       +      +
    948M  VAL*     1.3    50.7    +      -       -      +
    949M  ASP*     3.0     5.6    -      -       +      -
    950M  GLY*     2.6    32.4    +      -       -      -
    951M  GLU*     3.8    16.6    -      -       +      +
    954M  TRP*     3.3    60.8    -      +       +      -
   1017M  LEU*     4.0    14.4    -      -       +      -
   1298M  TYR*     4.5     0.3    +      -       -      -
    203Q  GLU*     3.5    35.2    -      -       +      -
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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