Contacts of the helix formed by residues 315 - 342 (chain A) in PDB entry 2AAT


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 LEU 315 (chain A).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     60A  SER*     3.8    19.9    -      -       -      +
     63A  LYS*     3.8    39.0    -      -       +      +
     64A  ALA*     5.1     6.5    -      -       +      -
     67A  TYR*     6.2     2.2    -      -       +      -
    308A  THR*     5.1     7.2    -      -       +      -
    309A  ILE*     3.3    22.5    -      -       -      +
    312A  ASN*     3.4    32.5    +      -       +      +
    314A  ALA*     1.3    76.0    -      -       +      +
    316A  ARG*     1.3    63.3    +      -       -      +
    317A  ALA      3.1     1.1    -      -       -      -
    318A  ILE*     3.1    25.3    +      -       +      +
    319A  TRP      3.3    14.2    +      -       -      -
----------------------------------------------------------
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Residues in contact with ARG 316 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     89A  CYS*     4.8     6.7    -      -       -      +
     92A  GLU*     4.7    12.3    +      -       -      +
     93A  LEU*     5.8     6.5    -      -       -      +
    309A  ILE*     2.8    22.9    +      -       +      +
    310A  LEU*     2.2    62.7    +      -       +      +
    312A  ASN      2.2    34.6    +      -       -      +
    313A  ASP*     4.2     4.5    -      -       -      -
    315A  LEU*     1.3    69.6    -      -       -      +
    317A  ALA*     1.3    56.2    +      -       -      +
    319A  TRP*     3.8     6.6    -      -       -      +
    320A  GLU*     2.8    60.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 317 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    313A  ASP      2.8    22.6    +      -       -      +
    314A  ALA*     3.3     9.4    -      -       -      +
    316A  ARG*     1.3    78.4    -      -       -      +
    318A  ILE*     1.3    62.6    +      -       -      +
    320A  GLU*     4.0     5.5    -      -       -      +
    321A  GLN*     3.5    17.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 318 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     59A  THR*     4.2    12.3    -      -       +      +
     60A  SER*     4.1     5.2    -      -       -      +
     63A  LYS*     4.8    15.9    -      -       +      +
    314A  ALA*     2.7    30.1    -      -       +      +
    315A  LEU*     3.1    35.6    +      -       +      +
    317A  ALA*     1.3    75.3    -      -       -      +
    319A  TRP*     1.3    63.6    +      -       -      +
    321A  GLN*     3.0     5.6    +      -       -      +
    322A  GLU*     3.0    38.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with TRP 319 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     58A  LEU*     4.0    11.0    -      -       +      +
     60A  SER*     3.3    21.4    -      -       -      +
     93A  LEU*     5.6     9.9    -      -       +      -
    233A  LEU*     5.1    12.1    -      -       +      -
    259A  ASN*     3.3    35.1    +      -       -      -
    260A  PHE*     3.1    62.7    -      +       -      +
    309A  ILE*     3.2    28.3    -      -       +      -
    310A  LEU*     4.4    15.5    -      -       +      -
    315A  LEU      3.3     2.7    +      -       -      +
    316A  ARG*     3.8     7.2    -      -       -      +
    318A  ILE*     1.3    75.1    -      -       -      +
    320A  GLU*     1.3    91.8    +      -       +      +
    322A  GLU*     2.9     5.5    +      -       -      +
    323A  LEU*     2.8    43.3    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLU 320 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    233A  LEU*     4.4    21.8    -      -       -      +
    234A  GLU*     5.6     1.4    -      -       -      +
    316A  ARG*     2.8    52.8    +      -       -      +
    317A  ALA*     4.8     4.5    -      -       -      +
    318A  ILE      3.4     0.2    -      -       -      -
    319A  TRP*     1.3    90.5    -      -       +      +
    321A  GLN*     1.3    59.3    +      -       -      +
    323A  LEU*     4.1     4.6    -      -       +      +
    324A  THR*     2.9    26.3    +      -       -      -
----------------------------------------------------------
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Residues in contact with GLN 321 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    317A  ALA      3.5    14.6    +      -       -      +
    318A  ILE*     3.0     6.8    +      -       -      +
    320A  GLU*     1.3    75.4    -      -       -      +
    322A  GLU*     1.3    57.8    +      -       -      +
    324A  THR*     3.2    14.0    +      -       +      -
    325A  ASP*     2.4    65.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 322 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     58A  LEU*     2.3    50.3    -      -       +      +
     59A  THR*     2.6    26.9    -      -       -      +
     60A  SER*     3.3    25.5    +      -       -      +
    318A  ILE*     3.0    24.5    +      -       -      +
    319A  TRP*     2.9     6.1    +      -       +      +
    321A  GLN*     1.3    81.4    -      -       -      +
    323A  LEU*     1.3    61.6    +      -       -      +
    325A  ASP*     3.3     7.2    +      -       -      +
    326A  MET*     3.1    30.0    +      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 323 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    228A  GLY      2.8    28.5    -      -       -      +
    229A  PHE*     3.9    18.2    -      -       +      -
    233A  LEU*     4.4     9.0    -      -       +      -
    259A  ASN*     3.5    41.7    -      -       -      +
    319A  TRP*     2.8    35.4    +      -       +      +
    320A  GLU*     4.1     8.3    -      -       +      +
    322A  GLU*     1.3    73.7    -      -       -      +
    324A  THR*     1.3    52.4    +      -       -      +
    326A  MET*     3.1    21.0    +      -       +      +
    327A  ARG*     2.8    40.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with THR 324 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    320A  GLU*     2.9    16.4    +      -       -      +
    321A  GLN*     3.3    25.1    -      -       +      +
    323A  LEU*     1.3    76.8    -      -       -      +
    325A  ASP*     1.3    64.6    +      -       -      +
    327A  ARG*     3.2    26.9    +      -       -      +
    328A  GLN*     2.9    27.2    +      -       +      +
----------------------------------------------------------
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Residues in contact with ASP 325 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     48A  TYR*     4.6     1.8    -      -       -      +
    321A  GLN*     2.4    53.2    +      -       -      +
    322A  GLU*     3.5    10.1    -      -       -      +
    324A  THR*     1.3    74.5    -      -       -      +
    326A  MET*     1.3    62.6    -      -       -      +
    327A  ARG      3.3     0.2    -      -       -      -
    328A  GLN*     2.7    36.6    +      -       -      +
    329A  ARG*     3.4     9.8    +      -       +      +
----------------------------------------------------------
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Residues in contact with MET 326 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     48A  TYR*     3.1    69.9    +      -       +      -
     58A  LEU*     4.7    21.3    -      -       +      -
    229A  PHE*     3.4    19.3    -      -       +      -
    258A  ALA      4.3    16.6    -      -       -      +
    259A  ASN      4.6     3.4    -      -       -      +
    322A  GLU*     3.1    16.4    +      -       +      +
    323A  LEU*     3.2    33.2    -      -       +      +
    325A  ASP*     1.3    80.2    -      -       -      +
    327A  ARG*     1.3    62.2    +      -       -      +
    329A  ARG*     3.8     2.8    +      -       -      +
    330A  ILE*     4.0     7.4    -      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 327 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    228A  GLY      4.0     6.3    +      -       -      -
    229A  PHE*     3.3    48.5    -      -       -      +
    230A  ALA*     4.3     1.3    -      -       -      +
    231A  ARG      4.4     2.5    -      -       -      +
    232A  GLY*     2.5    49.5    +      -       -      +
    233A  LEU*     5.8     0.4    -      -       -      +
    323A  LEU*     2.8    25.6    +      -       -      +
    324A  THR*     3.6    29.8    +      -       -      +
    325A  ASP      3.0     0.2    -      -       -      -
    326A  MET*     1.3    75.1    -      -       -      +
    328A  GLN*     1.3    69.0    +      -       -      +
    329A  ARG      2.5     3.3    +      -       -      -
    330A  ILE*     2.7    21.7    +      -       +      +
    331A  GLN*     3.4    29.2    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLN 328 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    324A  THR*     2.9    13.4    +      -       +      +
    325A  ASP*     2.7    24.6    +      -       -      +
    327A  ARG*     1.3    69.1    -      -       -      +
    329A  ARG*     1.3    49.6    +      -       +      +
    331A  GLN*     3.3     6.7    +      -       -      +
    332A  ARG*     2.5    59.8    +      -       +      +
----------------------------------------------------------
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Residues in contact with ARG 329 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     48A  TYR*     3.1    29.9    +      -       +      +
     49A  LYS      4.3     6.3    +      -       -      -
     50A  ASP*     2.9    14.3    -      -       -      +
     51A  GLU*     2.4    62.0    -      -       -      +
    325A  ASP*     3.7     9.6    -      -       +      +
    326A  MET      4.1     2.5    -      -       -      +
    327A  ARG      2.5     4.9    +      -       -      -
    328A  GLN*     1.3    71.1    -      -       +      +
    330A  ILE*     1.3    57.3    +      -       +      +
    332A  ARG*     4.1     7.2    -      -       +      -
    333A  MET*     2.6    58.2    -      -       +      +
    389A  VAL      5.4     1.0    -      -       -      +
    390A  ALA*     4.9     3.5    +      -       -      -
    392A  MET      3.4    23.2    +      -       -      -
    393A  THR*     3.4    11.5    +      -       -      +
    394A  PRO*     4.6     1.0    -      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 330 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     48A  TYR*     4.0    30.3    -      -       +      -
    229A  PHE*     4.6    21.5    -      -       +      +
    230A  ALA*     5.3     2.2    -      -       -      -
    326A  MET      4.0     7.9    -      -       -      +
    327A  ARG*     2.7    11.3    +      -       +      +
    329A  ARG*     1.3    74.0    -      -       -      +
    331A  GLN*     1.3    71.2    -      -       +      +
    333A  MET*     4.6     0.4    -      -       -      -
    334A  ARG*     2.9    33.8    -      -       -      +
    357A  ASN*     5.5     1.3    -      -       +      -
    358A  GLY*     2.9    35.2    -      -       -      +
    359A  MET*     3.7    27.6    -      -       +      +
    389A  VAL*     5.1     8.5    -      -       +      -
    390A  ALA*     4.5     7.6    -      -       +      +
----------------------------------------------------------
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Residues in contact with GLN 331 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    230A  ALA      5.8     0.5    -      -       -      -
    231A  ARG*     4.9     4.9    +      -       -      -
    232A  GLY*     4.7     2.4    +      -       -      -
    327A  ARG*     3.4    34.9    +      -       +      +
    328A  GLN*     3.3     9.5    +      -       -      +
    330A  ILE*     1.3    89.4    -      -       +      +
    332A  ARG*     1.3    62.8    -      -       -      +
    334A  ARG*     3.7     3.2    -      -       -      +
    335A  GLN*     3.7    13.7    +      -       -      +
    354A  ILE*     4.7     5.7    -      -       -      +
    355A  LYS*     3.4    32.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 332 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     51A  GLU*     6.3     1.4    -      -       -      +
    328A  GLN*     2.5    45.5    +      -       +      +
    329A  ARG*     4.1     8.5    -      -       +      -
    331A  GLN*     1.3    69.0    -      -       -      +
    333A  MET*     1.3    74.9    +      -       +      +
    334A  ARG      3.1     1.1    -      -       -      -
    335A  GLN*     3.0    30.2    +      -       -      +
    336A  LEU*     3.2    37.4    -      -       -      +
    394A  PRO*     5.5    11.7    -      -       -      +
----------------------------------------------------------
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Residues in contact with MET 333 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    329A  ARG*     2.6    54.5    +      -       +      +
    330A  ILE*     4.6     0.7    -      -       -      -
    332A  ARG*     1.3    85.1    -      -       +      +
    334A  ARG*     1.3    62.1    +      -       -      +
    336A  LEU*     2.8    45.2    -      -       +      +
    337A  PHE*     3.4     6.9    +      -       -      +
    389A  VAL*     4.6     9.4    -      -       +      +
    392A  MET*     3.1    50.3    -      -       +      +
    393A  THR*     3.8    14.1    -      -       -      +
    394A  PRO*     4.5     4.0    -      -       -      -
    397A  MET*     4.5     7.0    -      -       -      -
----------------------------------------------------------
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Residues in contact with ARG 334 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    330A  ILE      2.9    25.3    +      -       -      +
    331A  GLN      3.7     5.1    +      -       -      +
    332A  ARG      3.1     0.8    -      -       -      -
    333A  MET*     1.3    79.8    -      -       -      +
    335A  GLN*     1.3    63.1    +      -       -      +
    337A  PHE      4.0     2.8    +      -       -      -
    338A  VAL      4.0     0.9    +      -       -      -
    353A  ILE*     3.1    66.9    -      -       +      +
    354A  ILE*     3.4    15.6    -      -       -      +
    356A  GLN      3.5    14.3    +      -       -      -
    357A  ASN*     3.7     3.7    +      -       -      +
    358A  GLY      3.3    16.9    +      -       -      -
    360A  PHE      2.3    46.7    +      -       -      +
    361A  SER*     2.4    26.1    +      -       -      -
    389A  VAL*     3.1    37.0    -      -       +      +
----------------------------------------------------------
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Residues in contact with GLN 335 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    331A  GLN      3.7     4.1    +      -       -      +
    332A  ARG*     3.0    20.2    +      -       -      +
    334A  ARG*     1.3    75.5    -      -       -      +
    336A  LEU*     1.3    59.1    +      -       +      +
    338A  VAL*     2.9    26.5    +      -       -      +
    339A  ASN*     3.2    17.0    +      -       +      +
    354A  ILE*     2.8    26.0    -      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 336 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    332A  ARG*     3.2    54.7    -      -       -      +
    333A  MET*     2.8    34.8    -      -       +      +
    335A  GLN*     1.3    76.6    -      -       +      +
    337A  PHE*     1.3    69.5    +      -       -      +
    338A  VAL      2.7     2.5    +      -       -      -
    339A  ASN*     3.0     8.1    +      -       -      +
    340A  THR*     2.8    24.7    +      -       +      +
    394A  PRO*     6.1     3.1    -      -       +      -
    397A  MET*     4.2    18.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with PHE 337 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    333A  MET      3.4     3.0    +      -       -      +
    334A  ARG      4.2     0.7    -      -       -      +
    335A  GLN      3.5     0.2    -      -       -      -
    336A  LEU*     1.3    81.3    -      -       -      +
    338A  VAL*     1.3    66.8    +      -       +      +
    340A  THR*     3.6     2.9    +      -       -      -
    341A  LEU*     3.3    40.2    +      -       +      +
    350A  PHE*     3.3    33.9    -      +       -      -
    353A  ILE*     3.6    32.8    -      -       +      -
    363A  SER*     5.5     6.3    -      -       -      -
    387A  VAL*     6.0     0.7    -      -       +      -
    392A  MET*     2.8    47.3    -      -       +      -
    397A  MET*     3.6    28.4    -      -       +      +
    400A  LEU*     4.7    14.1    -      -       +      -
    404A  ILE*     4.5    12.8    -      -       +      -
----------------------------------------------------------
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Residues in contact with VAL 338 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    334A  ARG      4.0     0.2    +      -       -      -
    335A  GLN      2.9     5.0    +      -       -      +
    336A  LEU      2.7     2.4    +      -       -      -
    337A  PHE*     1.3    89.2    -      -       +      +
    339A  ASN*     1.3    64.8    +      -       -      +
    341A  LEU*     3.3     6.5    +      -       -      +
    342A  GLN*     3.0    19.3    +      -       +      +
    350A  PHE*     3.0    49.1    -      -       +      +
    351A  SER*     4.4     2.0    -      -       -      +
    353A  ILE*     4.1     4.7    -      -       +      -
    354A  ILE*     3.1    39.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with ASN 339 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    335A  GLN*     3.2    15.1    +      -       +      +
    336A  LEU*     3.0     9.5    +      -       -      +
    338A  VAL*     1.3    69.4    -      -       -      +
    340A  THR*     1.3    59.3    +      -       -      +
    342A  GLN*     2.7    47.0    +      -       +      +
    343A  GLU*     2.9    39.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with THR 340 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    336A  LEU*     2.8    25.9    +      -       -      +
    337A  PHE      3.7     1.8    -      -       -      -
    338A  VAL      3.2     0.2    -      -       -      -
    339A  ASN*     1.3    76.1    +      -       -      +
    341A  LEU*     1.3    56.0    +      -       -      +
    343A  GLU*     3.0    37.0    +      -       -      +
    344A  LYS*     3.2     8.2    +      -       +      +
    397A  MET*     4.0    23.1    -      -       +      +
    398A  ALA*     4.7     7.9    -      -       +      +
    401A  CYS*     3.2    32.8    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 341 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    337A  PHE*     3.3    31.8    +      -       +      +
    338A  VAL*     3.3     6.8    +      -       -      +
    339A  ASN      3.2     0.4    -      -       -      -
    340A  THR*     1.3    69.0    -      -       -      +
    342A  GLN*     1.3    57.5    +      -       -      +
    343A  GLU      2.9     9.1    +      -       -      -
    344A  LYS      3.3    20.4    +      -       -      +
    345A  GLY*     4.2    15.5    -      -       -      +
    346A  ALA*     3.5    13.2    +      -       -      +
    350A  PHE*     3.3    48.0    -      -       +      -
    401A  CYS*     3.1    45.5    -      -       +      +
    404A  ILE*     3.9    15.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLN 342 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    338A  VAL*     3.0    11.7    +      -       +      +
    339A  ASN*     2.7    43.4    +      -       -      +
    341A  LEU*     1.3    70.5    -      -       -      +
    343A  GLU*     1.3    56.1    -      -       +      +
    344A  LYS      3.8     1.1    -      -       -      -
    346A  ALA*     5.4     4.8    -      -       -      +
----------------------------------------------------------
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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