Contacts of the helix formed by residues 290 - 316 (chain C) in PDB entry 1U3Q


Residue contacts within the protein are derived with the CSU software (Sobolev V., Sorokine A., Prilusky J., Abola E.E. and Edelman M. (1999) Automated analysis of interatomic contacts in proteins. Bioinformatics, 15, 327-332). A short description of the analytical approach is given at the end of the page.
For CSU analysis of other PDB entry

Note:
Non-standard 3 letter residue codes indicate a heterogroup. To identify and analyse, use LPC software

Legend:
Dist - nearest distance (Å) between atoms of two residues
Surf - contact surface area (Å2) between two residues
HB   - hydrophilic-hydrophilic contact (hydrogen bond)
Arom - aromatic-aromatic contact
Phob - hydrophobic-hydrophobic contact
DC   - hydrophobic-hydrophilic contact (destabilizing contact)
+/-  - indicates presence/absence of a specific contacts
*    - indicates residues forming contacts  by their side chain
       (including CA atoms)
Residues in contact with THR 290 (chain C).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    288C  PRO*     3.5    14.6    -      -       +      +
    289C  PHE*     1.3    76.4    -      -       -      +
    291C  GLU*     1.3    66.7    +      -       -      +
    292C  ALA*     2.7    12.9    +      -       -      +
    293C  SER*     2.7    34.8    +      -       -      -
    294C  MET*     3.0     9.5    +      -       -      +
    369C  CYS*     4.5     2.2    -      -       -      -
----------------------------------------------------------
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Residues in contact with GLU 291 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    290C  THR*     1.3    71.5    -      -       -      +
    292C  ALA*     1.3    60.6    +      -       -      +
    295C  MET*     3.4    25.1    +      -       -      +
    369C  CYS      3.4    25.4    +      -       -      +
    370C  VAL*     4.0    21.7    -      -       +      +
    371C  GLU*     3.9    20.3    +      -       -      +
    479C  MET*     4.9     7.2    -      -       -      +
    482C  LYS*     3.8    25.0    +      -       -      -
    484C  VAL*     3.2    28.3    -      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 292 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    290C  THR*     2.7    14.0    +      -       -      +
    291C  GLU*     1.3    75.5    -      -       -      +
    293C  SER*     1.3    66.2    +      -       -      +
    294C  MET      3.2     0.2    +      -       -      -
    295C  MET*     3.4     2.8    +      -       -      +
    296C  MET*     3.2    23.0    +      -       -      +
    484C  VAL*     4.9    19.2    -      -       +      +
    485C  VAL*     5.0     1.4    -      -       -      +
----------------------------------------------------------
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Residues in contact with SER 293 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    285C  PRO*     3.8    24.9    -      -       -      -
    287C  ALA*     5.6     1.1    -      -       -      -
    288C  PRO      4.0     2.6    +      -       -      -
    289C  PHE*     3.2    11.9    -      -       -      -
    290C  THR*     2.7    43.5    +      -       -      -
    292C  ALA*     1.3    76.6    -      -       -      +
    294C  MET*     1.3    55.9    +      -       -      +
    296C  MET*     3.5    10.6    +      -       -      +
    297C  SER*     2.7    33.5    +      -       -      -
----------------------------------------------------------
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Residues in contact with MET 294 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    289C  PHE*     3.6    28.7    -      -       +      -
    290C  THR      3.0    12.3    +      -       -      +
    293C  SER*     1.3    76.0    +      -       -      +
    295C  MET*     1.3    66.2    +      -       -      +
    297C  SER*     3.0     5.0    +      -       -      -
    298C  LEU*     2.9    42.7    +      -       +      +
    362C  LEU*     3.7    24.2    -      -       +      -
    366C  GLU*     3.4    25.4    -      -       -      +
    367C  GLY*     3.8    16.8    -      -       -      +
    369C  CYS*     3.9     9.4    -      -       +      -
    370C  VAL*     3.3    35.9    -      -       +      -
    373C  ILE*     4.2     5.2    -      -       +      -
    377C  PHE*     4.4     5.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with MET 295 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    291C  GLU*     3.4    18.2    +      -       +      +
    292C  ALA      3.4     1.8    +      -       -      +
    294C  MET*     1.3    78.9    -      -       -      +
    296C  MET*     1.3    50.4    +      -       -      +
    298C  LEU*     4.1    10.0    -      -       +      +
    299C  THR*     2.5    42.5    +      -       -      +
    370C  VAL*     3.7    11.9    -      -       +      -
    373C  ILE*     3.6    20.0    -      -       +      -
    475C  HIS*     3.3    28.5    -      -       +      -
    476C  LEU*     4.4    10.3    -      -       -      -
    479C  MET*     3.7    31.0    -      -       -      -
    484C  VAL*     5.4     0.7    -      -       +      -
    485C  VAL*     3.0    31.2    -      -       +      -
    501C  272      3.8    11.9    -      -       -      +
----------------------------------------------------------
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Residues in contact with MET 296 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    282C  ILE*     6.1     0.4    -      -       +      -
    285C  PRO*     5.2    11.9    -      -       +      -
    292C  ALA      3.2    15.7    +      -       -      +
    293C  SER*     3.6     8.7    -      -       -      +
    294C  MET      3.1     0.6    -      -       -      -
    295C  MET*     1.3    74.9    -      -       -      +
    297C  SER*     1.3    74.6    +      -       -      +
    299C  THR*     2.9     5.7    +      -       -      -
    300C  LYS*     2.8    51.0    +      -       +      +
    485C  VAL*     4.4     6.4    -      -       +      +
    486C  PRO*     5.8     5.6    -      -       +      -
    488C  TYR*     3.3    16.7    +      -       +      +
----------------------------------------------------------
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Residues in contact with SER 297 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    282C  ILE*     2.9    36.9    -      -       -      +
    283C  SER      4.9     2.1    +      -       -      -
    285C  PRO*     3.9    11.1    -      -       -      +
    289C  PHE*     3.6    20.8    -      -       -      -
    293C  SER      2.7    18.4    +      -       -      -
    294C  MET*     3.0     8.9    +      -       -      -
    296C  MET*     1.3    87.5    -      -       -      +
    298C  LEU*     1.3    63.2    +      -       -      +
    301C  LEU*     3.1    10.2    +      -       -      +
    360C  LEU*     4.6    13.0    -      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 298 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    294C  MET*     2.9    33.5    +      -       +      +
    295C  MET*     4.1    12.1    -      -       +      +
    297C  SER*     1.3    80.5    -      -       -      +
    299C  THR*     1.3    51.5    +      -       -      +
    301C  LEU*     3.3     6.7    +      -       +      +
    302C  ALA*     2.7    35.4    +      -       -      +
    356C  PHE*     3.8    40.8    -      -       +      -
    360C  LEU*     4.5     9.9    -      -       +      -
    362C  LEU*     4.8     6.5    -      -       +      -
    373C  ILE*     3.9    28.0    -      -       +      -
    377C  PHE*     4.6     6.7    -      -       +      -
    501C  272      4.0    27.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with THR 299 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    295C  MET*     2.5    30.4    +      -       -      +
    296C  MET*     2.9    12.3    +      -       -      -
    298C  LEU*     1.3    73.3    -      -       +      +
    300C  LYS*     1.3    52.6    +      -       -      -
    302C  ALA*     3.6     6.9    -      -       -      +
    303C  ASP*     2.7    36.4    +      -       -      +
    476C  LEU*     3.8    29.8    -      -       +      -
    485C  VAL*     3.8    13.8    -      -       +      +
    486C  PRO      5.2     0.9    -      -       -      +
    488C  TYR*     3.1    23.4    +      -       -      -
    491C  LEU*     4.0    16.8    -      -       +      +
    501C  272      5.2     1.8    -      -       +      -
----------------------------------------------------------
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Residues in contact with LYS 300 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    281C  LEU      5.5     0.8    +      -       -      -
    282C  ILE*     4.0    22.3    -      -       +      +
    296C  MET*     2.8    37.0    +      -       +      +
    297C  SER      4.1     2.0    -      -       -      +
    299C  THR*     1.3    72.9    +      -       -      +
    301C  LEU*     1.3    56.9    +      -       -      +
    303C  ASP*     3.4     1.8    -      -       -      +
    304C  LYS*     2.9    64.3    +      -       +      +
    488C  TYR*     3.2    19.0    -      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 301 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    280C  VAL*     3.6    31.2    -      -       +      +
    282C  ILE*     3.9    16.5    -      -       +      +
    297C  SER      3.1    17.4    +      -       -      +
    298C  LEU*     3.3     4.7    -      -       -      +
    300C  LYS*     1.3    80.0    -      -       -      +
    302C  ALA*     1.3    64.3    +      -       -      +
    304C  LYS*     3.2     7.8    +      -       -      +
    305C  GLU*     2.9    36.2    +      -       -      +
    356C  PHE*     3.6    45.3    -      -       +      +
    360C  LEU*     4.4     8.5    -      -       +      -
    501C  272      3.8    17.7    -      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 302 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    298C  LEU      2.7    19.8    +      -       -      +
    299C  THR*     3.6     8.3    -      -       -      +
    301C  LEU*     1.3    72.3    -      -       -      +
    303C  ASP*     1.3    58.1    +      -       -      +
    305C  GLU*     3.1    13.5    +      -       -      +
    306C  LEU*     2.8    34.9    +      -       -      +
    335C  TRP*     4.7     3.8    -      -       +      -
    339C  LEU*     3.9    18.3    -      -       +      +
    476C  LEU*     6.2     1.8    -      -       +      -
    491C  LEU*     4.5    14.6    -      -       +      -
    501C  272      4.0    12.6    -      -       +      -
----------------------------------------------------------
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Residues in contact with ASP 303 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    299C  THR      2.7    21.7    +      -       -      +
    300C  LYS*     3.4     5.1    -      -       -      +
    302C  ALA*     1.3    73.9    -      -       -      +
    304C  LYS*     1.3    66.3    +      -       -      +
    306C  LEU*     3.3    16.4    +      -       -      +
    307C  VAL*     3.7    13.2    +      -       -      +
    488C  TYR*     3.5    23.0    -      -       +      +
    489C  ASP*     3.1    26.9    -      -       -      +
    490C  LEU*     3.5     5.9    +      -       -      +
    491C  LEU*     3.1    35.9    +      -       +      +
----------------------------------------------------------
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Residues in contact with LYS 304 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    280C  VAL*     4.0    22.2    -      -       +      +
    281C  LEU      3.4    23.8    +      -       -      +
    282C  ILE*     5.7     1.3    -      -       +      -
    300C  LYS*     2.9    49.0    +      -       +      +
    301C  LEU*     3.7     4.5    -      -       -      +
    303C  ASP*     1.3    80.7    -      -       -      +
    305C  GLU*     1.3    60.8    +      -       -      +
    307C  VAL*     3.5    14.5    +      -       -      +
    308C  HIS*     3.0    25.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 305 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    278C  PRO      5.9     1.8    -      -       -      +
    280C  VAL*     4.0    18.7    +      -       +      +
    301C  LEU*     2.9    22.1    +      -       -      +
    302C  ALA*     3.1     6.8    +      -       -      +
    304C  LYS*     1.3    77.0    -      -       -      +
    306C  LEU*     1.3    64.2    -      -       -      +
    308C  HIS*     2.9    21.2    +      -       +      +
    309C  MET*     3.0    13.4    +      -       -      +
    339C  LEU*     3.3    23.5    -      -       +      +
    346C  ARG*     3.5    23.0    +      -       -      -
    501C  272      2.4    40.0    -      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 306 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    302C  ALA      2.8    16.3    +      -       -      +
    303C  ASP*     3.3     9.1    +      -       -      +
    305C  GLU*     1.3    77.0    -      -       -      +
    307C  VAL*     1.3    60.4    +      -       -      +
    309C  MET*     3.6    18.2    +      -       +      +
    310C  ILE*     3.1    28.8    +      -       +      +
    335C  TRP*     3.3    40.6    -      -       +      -
    339C  LEU*     4.6     2.5    -      -       +      -
    490C  LEU*     3.8    12.8    -      -       +      -
    491C  LEU*     3.5    42.6    -      -       +      +
    494C  MET*     3.6    28.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with VAL 307 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    303C  ASP*     3.8    16.6    -      -       -      +
    304C  LYS*     3.8    10.3    -      -       -      +
    305C  GLU      3.1     1.0    +      -       -      -
    306C  LEU*     1.3    76.9    -      -       -      +
    308C  HIS*     1.3    70.4    +      -       +      +
    310C  ILE*     3.4     9.4    +      -       +      +
    311C  SER*     3.0    26.0    +      -       -      +
    490C  LEU*     4.0    19.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with HIS 308 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    277C  PRO*     4.0    22.4    -      -       +      +
    278C  PRO*     4.3    28.6    -      -       +      +
    280C  VAL*     3.4    27.3    -      -       +      +
    304C  LYS*     3.0    26.9    +      -       -      +
    305C  GLU*     2.9     8.0    +      -       +      +
    307C  VAL*     1.3    83.6    -      -       +      +
    309C  MET*     1.3    58.8    +      -       -      +
    311C  SER*     3.2    10.9    +      -       -      -
    312C  TRP*     2.9    27.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with MET 309 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    277C  PRO*     4.9     3.8    -      -       -      +
    305C  GLU      3.0    10.3    +      -       -      +
    306C  LEU*     3.7    16.2    -      -       +      +
    308C  HIS*     1.3    76.1    -      -       -      +
    310C  ILE*     1.3    52.3    +      -       +      +
    312C  TRP*     2.8    29.3    +      -       +      +
    313C  ALA*     2.7    34.6    +      -       -      +
    331C  LEU*     4.1    21.3    -      -       +      -
    334C  CYS*     4.9     0.4    -      -       -      -
    335C  TRP*     3.4    49.8    -      -       +      +
    338C  VAL*     3.5    25.1    -      -       +      -
    339C  LEU*     3.8    21.5    -      -       +      -
    494C  MET*     5.6     0.4    -      -       -      -
----------------------------------------------------------
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Residues in contact with ILE 310 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    306C  LEU*     3.1    17.3    -      -       +      +
    307C  VAL*     3.6     8.5    -      -       -      +
    308C  HIS      3.3     0.2    -      -       -      -
    309C  MET*     1.3    76.7    -      -       +      +
    311C  SER*     1.3    61.2    +      -       -      +
    313C  ALA*     3.4     6.8    +      -       -      +
    314C  LYS*     3.2    39.9    +      -       +      +
    331C  LEU*     4.5    25.1    -      -       +      -
    490C  LEU*     3.7    28.7    -      -       +      -
    494C  MET*     5.5     9.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with SER 311 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    307C  VAL*     3.0    17.7    +      -       -      +
    308C  HIS*     3.2    12.4    +      -       -      -
    309C  MET      3.2     0.4    -      -       -      -
    310C  ILE*     1.3    77.5    -      -       -      +
    312C  TRP*     1.3    62.6    +      -       -      +
    314C  LYS*     3.7     8.0    +      -       -      +
    315C  LYS*     3.3    42.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with TRP 312 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    272C  LEU*     4.8     9.5    +      -       -      +
    275C  ALA*     3.4    39.5    -      -       +      +
    276C  GLU*     4.2     8.1    +      -       -      -
    277C  PRO*     4.1    16.4    -      -       +      -
    308C  HIS      2.9    12.3    +      -       -      +
    309C  MET*     2.8    34.9    +      -       +      +
    311C  SER*     1.3    75.9    -      -       -      +
    313C  ALA*     1.3    68.1    +      -       +      +
    315C  LYS*     3.1    15.2    +      -       -      +
    316C  ILE*     3.4    23.5    +      -       +      +
    338C  VAL*     3.8    22.9    -      -       +      -
    398C  LEU      5.1     1.7    +      -       -      -
    401C  LYS*     3.5    42.6    -      -       +      +
    402C  ALA*     3.8    25.1    -      -       +      -
    405C  LEU*     3.7    23.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 313 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    309C  MET      2.7    16.8    +      -       -      +
    310C  ILE      3.7     5.4    -      -       -      +
    312C  TRP*     1.3    73.5    -      -       +      +
    314C  LYS*     1.3    58.8    +      -       -      +
    316C  ILE*     2.9    37.3    +      -       -      +
    319C  PHE*     3.2    34.9    -      -       +      +
    331C  LEU*     4.1    13.9    -      -       +      -
    405C  LEU*     3.8    18.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with LYS 314 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    310C  ILE*     3.2    33.3    +      -       +      +
    311C  SER*     4.1     7.2    -      -       -      +
    312C  TRP      3.3     0.4    -      -       -      -
    313C  ALA*     1.3    75.2    -      -       -      +
    315C  LYS*     1.3    60.1    +      -       +      +
    316C  ILE      3.2     4.3    +      -       -      +
    319C  PHE*     3.9    13.0    -      -       +      -
    320C  VAL*     3.3    38.7    -      -       +      +
    327C  GLN*     4.8     5.8    -      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 315 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    271C  THR*     5.2     4.5    -      -       -      -
    274C  GLU*     5.2     2.9    -      -       +      -
    275C  ALA*     3.6    37.3    -      -       +      +
    311C  SER*     3.3    29.4    +      -       -      +
    312C  TRP      3.1    10.5    +      -       -      +
    314C  LYS*     1.3    76.1    -      -       +      +
    316C  ILE*     1.3    60.4    +      -       -      +
    317C  PRO*     3.1    16.5    -      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 316 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    268C  LEU*     5.4     3.1    -      -       +      -
    272C  LEU*     4.3    19.5    -      -       +      -
    275C  ALA*     5.5     1.6    -      -       +      -
    312C  TRP*     3.4    37.0    -      -       +      +
    313C  ALA      2.9    11.3    +      -       -      +
    314C  LYS      4.1     3.6    -      -       -      +
    315C  LYS*     1.3    78.0    -      -       -      +
    317C  PRO*     1.3    73.2    -      -       +      +
    318C  GLY      3.1     0.3    +      -       -      -
    319C  PHE*     2.9    25.4    +      -       +      +
    320C  VAL*     4.5     0.5    +      -       -      +
    402C  ALA*     4.4    13.5    -      -       +      +
    405C  LEU*     3.6    31.0    -      -       +      -
    406C  LEU*     4.9     9.9    -      -       +      -
    429C  LEU*     4.1    22.0    -      -       +      -
    433C  VAL*     5.5     1.8    -      -       +      -
----------------------------------------------------------
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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