Contacts of the helix formed by residues 319 - 347 (chain A) in PDB entry 1YNU


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 319 (chain A).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     58A  TRP*     2.9    31.7    +      -       +      +
     62A  ASN*     5.3     1.2    -      -       -      +
    315A  ALA      3.4     7.1    +      -       -      +
    316A  MET      3.2    10.6    +      -       -      +
    318A  SER*     1.3    73.4    -      -       -      +
    320A  LYS*     1.3    58.0    +      -       -      +
    321A  LYS*     3.0    26.9    +      -       -      +
    322A  LEU*     2.9    29.7    +      -       +      +
    323A  THR*     3.0    15.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 320 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     97A  ASP*     3.9    32.4    +      -       -      +
     98A  PHE*     5.3     1.0    -      -       -      +
    101A  GLU*     4.3    23.6    +      -       -      +
    317A  LEU      4.6    12.5    +      -       -      -
    318A  SER*     3.0    14.3    +      -       -      +
    319A  ASP*     1.3    70.7    +      -       -      +
    321A  LYS*     1.3    58.4    +      -       +      +
    322A  LEU      3.4     0.2    -      -       -      -
    323A  THR*     3.5     6.6    +      -       -      +
    324A  LYS*     3.2    30.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 321 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    319A  ASP*     3.0    12.0    +      -       -      +
    320A  LYS*     1.3    76.7    -      -       +      +
    322A  LEU*     1.3    65.7    +      -       -      +
    324A  LYS*     4.1     4.1    -      -       -      +
    325A  ASN*     3.2    25.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 322 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     54A  LEU*     4.2    20.2    -      -       +      +
     55A  LEU*     4.6    11.7    -      -       +      -
     58A  TRP*     3.7    43.1    -      -       +      +
    316A  MET*     3.7    35.7    -      -       +      +
    319A  ASP*     2.9    21.1    +      -       +      +
    321A  LYS*     1.3    81.2    -      -       -      +
    323A  THR*     1.3    60.6    +      -       +      +
    325A  ASN*     3.7     6.4    -      -       -      +
    326A  TYR*     2.8    36.3    +      -       +      +
----------------------------------------------------------
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Residues in contact with THR 323 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     98A  PHE*     4.2    15.5    -      -       +      -
    101A  GLU*     2.8    25.9    +      -       -      -
    316A  MET      4.0     3.1    -      -       -      +
    317A  LEU*     3.9    43.9    +      -       +      +
    319A  ASP      3.0     9.2    +      -       -      +
    320A  LYS*     3.5    18.0    +      -       -      +
    322A  LEU*     1.3    75.4    -      -       +      +
    324A  LYS*     1.3    65.5    +      -       -      +
    326A  TYR*     4.2     5.2    -      -       -      -
    327A  ILE*     3.0    32.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 324 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    101A  GLU*     4.1    17.5    -      -       -      +
    320A  LYS      3.2    17.3    +      -       -      +
    321A  LYS*     4.1     4.5    -      -       -      +
    323A  THR*     1.3    80.2    +      -       -      +
    325A  ASN*     1.3    62.7    +      -       -      +
    327A  ILE*     4.0     3.1    -      -       -      +
    328A  ALA*     3.3    24.6    +      -       +      +
----------------------------------------------------------
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Residues in contact with ASN 325 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     54A  LEU*     4.2    20.4    -      -       -      +
    321A  LYS      3.2    17.1    +      -       -      +
    322A  LEU*     3.9     6.1    -      -       +      +
    324A  LYS*     1.3    78.9    -      -       -      +
    326A  TYR*     1.3    64.5    +      -       -      +
    328A  ALA*     4.7     4.8    -      -       -      +
    329A  GLU*     3.0    34.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with TYR 326 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     48A  ASN*     4.4     4.2    +      -       -      -
     51A  CYS*     3.3    42.8    -      -       +      +
     54A  LEU*     4.1    16.4    -      -       +      +
     55A  LEU*     4.0    28.7    -      -       +      -
     98A  PHE*     5.6     1.8    -      +       +      -
    274A  ASP*     2.6    31.6    +      -       +      -
    275A  LEU*     3.4    33.6    +      -       +      -
    276A  GLY*     5.1     0.2    -      -       -      -
    322A  LEU*     2.8    23.9    +      -       +      +
    323A  THR*     3.3     7.6    +      -       -      +
    325A  ASN*     1.3    77.5    +      -       -      +
    327A  ILE*     1.3    67.8    +      -       +      +
    329A  GLU*     3.7     0.7    -      -       -      +
    330A  ASN*     2.8    50.6    +      -       +      +
----------------------------------------------------------
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Residues in contact with ILE 327 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     98A  PHE*     3.9    25.1    -      -       +      -
    101A  GLU*     3.5    35.2    -      -       +      +
    102A  ILE*     4.3    17.0    -      -       +      +
    235A  GLY*     5.4     4.3    -      -       -      +
    323A  THR      3.0    17.6    +      -       -      +
    324A  LYS*     4.0     3.8    -      -       -      +
    326A  TYR*     1.3    83.9    -      -       +      +
    328A  ALA*     1.3    63.1    +      -       -      +
    330A  ASN*     3.3     4.0    +      -       -      +
    331A  HIS*     3.1    50.2    +      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 328 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    324A  LYS*     3.3    16.8    +      -       +      +
    325A  ASN*     4.1     6.3    -      -       -      +
    327A  ILE*     1.3    79.6    -      -       -      +
    329A  GLU*     1.3    62.5    +      -       -      +
    331A  HIS*     3.5     7.5    +      -       -      +
    332A  LYS*     3.3    22.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 329 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     51A  CYS*     4.2     1.1    -      -       -      -
     54A  LEU*     3.7    21.1    -      -       +      -
    325A  ASN*     3.0    29.2    +      -       -      +
    328A  ALA*     1.3    75.1    -      -       -      +
    330A  ASN*     1.3    61.5    +      -       -      +
    332A  LYS*     3.6    22.1    +      -       -      +
    333A  ARG*     2.8    80.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASN 330 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     48A  ASN*     2.9    32.8    +      -       -      +
     50A  LEU*     4.8     1.0    -      -       -      +
     51A  CYS*     3.3    24.4    -      -       -      -
    235A  GLY      3.9    13.7    +      -       -      -
    236A  THR*     4.9     0.4    -      -       -      +
    274A  ASP*     3.5    16.6    +      -       -      +
    326A  TYR*     2.8    35.2    +      -       +      +
    327A  ILE*     3.7     5.1    -      -       -      +
    329A  GLU*     1.3    71.4    -      -       -      +
    331A  HIS*     1.3    59.8    +      -       +      +
    333A  ARG*     3.3     1.4    +      -       -      +
    334A  LEU*     2.8    50.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with HIS 331 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    235A  GLY*     3.4    29.7    +      -       -      -
    236A  THR*     4.7     1.6    -      -       -      -
    237A  ALA*     3.4    31.5    +      -       +      +
    238A  PHE*     3.2    22.4    -      -       +      +
    327A  ILE*     3.1    39.7    +      -       +      +
    328A  ALA*     3.8     6.9    -      -       -      +
    329A  GLU      3.4     0.2    -      -       -      -
    330A  ASN*     1.3    76.0    -      -       +      +
    332A  LYS*     1.3    58.4    +      -       -      +
    334A  LEU*     4.4     1.1    -      -       +      -
    335A  LYS*     2.9    29.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 332 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    328A  ALA      3.3    14.8    +      -       -      +
    329A  GLU*     3.7    27.5    +      -       -      +
    330A  ASN      3.2     0.2    -      -       -      -
    331A  HIS*     1.3    80.5    -      -       -      +
    333A  ARG*     1.3    59.3    +      -       +      +
    335A  LYS*     3.4     5.6    +      -       -      +
    336A  GLN*     3.0    44.4    +      -       +      +
----------------------------------------------------------
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Residues in contact with ARG 333 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     50A  LEU*     2.8    53.9    +      -       +      +
     51A  CYS*     3.9     9.5    -      -       -      +
     53A  ASP*     2.9    33.1    +      -       -      -
     54A  LEU*     4.0     9.6    -      -       -      +
    329A  GLU*     2.8    54.4    +      -       -      +
    330A  ASN*     4.0     3.1    -      -       -      +
    332A  LYS*     1.3    74.8    -      -       +      +
    334A  LEU*     1.3    61.2    +      -       -      +
    336A  GLN*     3.4    10.8    +      -       -      +
    337A  ARG*     2.9    31.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 334 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     48A  ASN*     4.0     7.4    -      -       -      +
     50A  LEU*     3.9    19.3    -      -       +      -
    235A  GLY      4.7     0.2    -      -       -      +
    236A  THR*     3.8    30.3    -      -       +      -
    238A  PHE*     3.6    18.6    -      -       +      -
    330A  ASN*     2.8    48.2    +      -       -      +
    331A  HIS*     3.6     7.4    -      -       -      +
    333A  ARG*     1.3    77.5    -      -       -      +
    335A  LYS*     1.3    52.1    +      -       -      +
    337A  ARG*     3.1     3.1    +      -       -      +
    338A  GLN*     2.7    36.9    +      -       -      +
    358A  GLY      4.5     1.8    -      -       -      +
    359A  LEU*     3.7    23.6    -      -       +      -
    410A  PHE*     4.0     9.5    -      -       +      -
    411A  ALA*     4.3     6.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with LYS 335 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    238A  PHE*     3.7    26.8    -      -       +      +
    239A  SER*     3.7    21.7    +      -       -      +
    331A  HIS      2.9    17.6    +      -       -      +
    332A  LYS*     3.7     5.8    -      -       -      +
    334A  LEU*     1.3    75.9    -      -       -      +
    336A  GLN*     1.3    63.5    +      -       -      +
    338A  GLN*     3.1     3.4    +      -       -      +
    339A  LYS*     3.1    51.5    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLN 336 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    332A  LYS*     3.0    35.5    +      -       -      +
    333A  ARG*     3.8    10.4    -      -       -      +
    335A  LYS*     1.3    80.0    -      -       -      +
    337A  ARG*     1.3    64.3    +      -       -      +
    339A  LYS*     3.5    10.8    +      -       -      +
    340A  LYS*     3.3    20.0    +      -       +      +
    415A  GLU*     4.4    14.2    -      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 337 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     50A  LEU*     3.3    37.2    -      -       +      +
    333A  ARG      2.9    18.6    +      -       -      +
    334A  LEU      3.5     3.4    -      -       -      +
    336A  GLN*     1.3    77.2    -      -       -      +
    338A  GLN*     1.3    63.9    +      -       -      +
    340A  LYS*     3.3     7.9    +      -       -      +
    341A  LEU*     3.3    18.9    +      -       -      +
    410A  PHE*     2.8    53.7    +      -       +      +
    411A  ALA*     4.1     1.6    -      -       -      +
    413A  LEU*     2.9    32.1    +      -       -      +
    414A  PRO*     4.5     0.8    -      -       -      +
    415A  GLU*     3.5    39.4    +      -       -      +
    418A  LEU*     3.4    25.3    -      -       -      +
----------------------------------------------------------
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Residues in contact with GLN 338 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    238A  PHE*     3.7    26.0    -      -       +      -
    334A  LEU      2.7    19.4    +      -       -      +
    335A  LYS*     3.1     5.2    +      -       -      +
    337A  ARG*     1.3    72.8    -      -       -      +
    339A  LYS*     1.3    75.8    +      -       -      +
    341A  LEU*     3.0    14.2    +      -       -      +
    342A  VAL*     3.0    27.0    +      -       -      +
    354A  ASN*     5.9     0.4    -      -       -      +
    355A  GLY*     2.8    37.2    +      -       -      +
    360A  PHE      5.6     0.4    +      -       -      +
    361A  CYS*     4.0    13.7    -      -       -      -
    410A  PHE*     3.8    29.8    -      -       +      -
----------------------------------------------------------
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Residues in contact with LYS 339 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    335A  LYS*     3.1    49.0    +      -       +      +
    336A  GLN*     3.9     7.4    -      -       -      +
    338A  GLN*     1.3    85.7    -      -       -      +
    340A  LYS*     1.3    58.8    +      -       -      +
    342A  VAL*     3.7     6.5    -      -       +      +
    343A  SER*     2.8    33.8    +      -       -      -
----------------------------------------------------------
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Residues in contact with LYS 340 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    336A  GLN*     3.3    11.7    +      -       +      +
    337A  ARG*     3.5    13.2    -      -       -      +
    338A  GLN      3.2     0.4    -      -       -      -
    339A  LYS*     1.3    78.7    -      -       -      +
    341A  LEU*     1.3    60.4    +      -       -      +
    343A  SER*     4.7     4.9    -      -       -      -
    344A  GLY*     3.2    18.5    +      -       -      +
    415A  GLU*     3.9    27.5    +      -       +      +
    418A  LEU*     4.4    16.2    -      -       +      +
    419A  ASP*     2.7    38.4    +      -       -      +
    422A  MET*     5.0     3.6    -      -       -      +
----------------------------------------------------------
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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  ARG      3.3     7.6    +      -       -      +
    338A  GLN      3.0    10.0    +      -       -      +
    340A  LYS*     1.3    78.1    -      -       -      +
    342A  VAL*     1.3    55.7    +      -       -      +
    344A  GLY*     3.1     1.3    +      -       -      -
    345A  LEU*     2.8    51.5    +      -       +      +
    361A  CYS*     3.8    31.9    -      -       +      -
    408A  VAL*     3.9    28.5    -      -       +      +
    410A  PHE*     3.8    23.8    -      -       +      -
    418A  LEU*     4.2    18.8    -      -       +      +
    422A  MET*     3.8    29.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with VAL 342 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    338A  GLN*     3.0    37.6    +      -       -      +
    339A  LYS*     3.7     8.7    -      -       -      +
    341A  LEU*     1.3    75.4    -      -       -      +
    343A  SER*     1.3    53.0    +      -       -      +
    345A  LEU*     3.1    10.6    +      -       -      +
    346A  GLN*     2.7    61.4    +      -       +      +
    350A  ILE      4.6     0.2    -      -       -      +
    352A  CYS*     4.8    16.2    -      -       +      +
    361A  CYS*     4.3    13.2    -      -       -      -
----------------------------------------------------------
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Residues in contact with SER 343 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    339A  LYS      2.8    17.5    +      -       -      -
    340A  LYS*     4.4     7.2    -      -       -      -
    342A  VAL*     1.3    73.2    -      -       -      +
    344A  GLY*     1.3    66.0    +      -       -      +
    346A  GLN*     3.3    18.9    +      -       -      +
    347A  LYS*     3.0    22.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLY 344 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    340A  LYS*     3.2    13.3    +      -       -      +
    341A  LEU      3.1     7.5    +      -       -      -
    343A  SER*     1.3    78.4    +      -       -      +
    345A  LEU*     1.3    58.0    +      -       -      +
    347A  LYS*     2.7    41.5    +      -       -      +
    348A  SER*     3.7     1.2    +      -       -      -
    422A  MET*     3.7    23.1    -      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 345 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    341A  LEU*     2.8    36.8    +      -       +      +
    342A  VAL      3.4     6.5    -      -       -      +
    344A  GLY*     1.3    72.7    -      -       -      +
    346A  GLN*     1.3    53.7    +      -       -      +
    347A  LYS      2.9     4.9    -      -       -      -
    348A  SER*     2.8    27.4    +      -       -      +
    350A  ILE*     2.9    37.7    +      -       +      +
    352A  CYS*     3.1    33.2    -      -       -      -
    363A  VAL*     3.7    20.2    -      -       +      -
    408A  VAL*     5.6     4.9    -      -       +      -
    422A  MET*     4.2    10.3    -      -       +      -
    425A  LEU*     3.6    28.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLN 346 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    342A  VAL*     2.7    47.3    +      -       +      +
    343A  SER*     3.3    18.9    +      -       -      +
    345A  LEU*     1.3    72.8    -      -       -      +
    347A  LYS*     1.3    55.4    +      -       -      +
    349A  GLY*     2.8    19.6    +      -       -      -
    350A  ILE      3.4    14.6    +      -       -      +
    351A  SER*     5.8     2.0    -      -       -      -
----------------------------------------------------------
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Residues in contact with LYS 347 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    343A  SER      3.0    11.8    +      -       -      +
    344A  GLY*     2.7    42.0    +      -       -      +
    345A  LEU      2.9     0.2    -      -       -      -
    346A  GLN*     1.3    78.3    -      -       -      +
    348A  SER*     1.3    67.0    +      -       -      +
    349A  GLY      3.2     0.7    -      -       -      -
    422A  MET*     3.5    25.8    +      -       -      +
    423A  GLN*     4.9     5.4    -      -       -      +
    426A  LYS*     2.7    53.7    +      -       +      +
----------------------------------------------------------
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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