Contacts of the helix formed by residues 276 - 299 (chain C) in PDB entry 3P3W


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 LYS 276 (chain C).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     15C  ASN*     4.9    16.0    +      -       -      +
     17C  VAL      6.0     0.8    -      -       -      +
     18C  GLN*     4.2    23.1    -      -       +      +
     19C  GLU*     4.2     9.6    +      -       -      +
    196C  GLU*     6.0     0.2    +      -       -      -
    225C  THR*     5.2     0.7    -      -       -      -
    226C  ASP*     3.3    37.5    -      -       -      +
    245C  VAL*     5.2     0.2    -      -       -      -
    269C  GLU*     5.1     4.8    +      -       -      -
    273C  ALA*     5.0     7.9    -      -       -      -
    274C  PRO      3.0     7.6    +      -       -      +
    275C  LEU*     1.3    77.0    -      -       -      +
    277C  TYR*     1.3    63.5    +      -       +      +
    278C  THR*     3.3    18.6    -      -       -      +
    279C  SER*     2.8    23.2    +      -       -      +
    280C  ALA*     2.9    17.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with TYR 277 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    114C  ARG*     3.0    45.9    +      -       -      -
    194C  GLU*     4.3     6.5    +      -       -      -
    195C  VAL*     6.3     0.7    -      -       +      -
    221C  ASN*     3.6    16.2    +      -       -      -
    222C  LEU*     3.8    34.1    -      -       +      +
    223C  GLY*     3.4    33.9    -      -       -      -
    225C  THR*     5.8     0.4    +      -       -      -
    244C  ILE*     3.8    19.1    -      -       +      -
    245C  VAL*     4.1     8.9    -      -       +      +
    275C  LEU      4.0     0.2    +      -       -      -
    276C  LYS*     1.3    73.7    -      -       +      +
    278C  THR*     1.3    75.0    +      -       +      +
    280C  ALA*     3.4     8.5    -      -       -      +
    281C  LEU*     2.8    56.3    +      -       +      +
----------------------------------------------------------
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Residues in contact with THR 278 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     19C  GLU*     3.1    32.8    +      -       -      +
     76C  PHE*     4.7     9.2    -      -       +      -
     99C  PRO*     4.1    12.7    -      -       -      +
    114C  ARG*     4.3    10.5    -      -       -      +
    276C  LYS*     3.7    14.2    -      -       -      +
    277C  TYR*     1.3   107.5    -      -       +      +
    279C  SER*     1.3    58.3    +      -       -      +
    281C  LEU*     3.5     2.9    +      -       -      +
    282C  THR*     3.2    31.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with SER 279 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     18C  GLN*     3.1    42.9    +      -       -      -
     19C  GLU*     3.6     7.4    -      -       -      +
     22C  ALA*     3.4    11.9    -      -       -      +
    255C  PHE*     5.2     0.9    -      -       -      -
    275C  LEU*     3.8     9.2    -      -       -      +
    276C  LYS*     2.8    37.6    +      -       -      +
    278C  THR*     1.3    74.7    +      -       -      +
    280C  ALA*     1.3    60.7    +      -       -      +
    282C  THR*     2.6    22.2    +      -       -      -
    283C  HIS*     3.9     5.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 280 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    245C  VAL*     3.8    24.9    -      -       +      -
    275C  LEU*     4.6    15.9    -      -       +      -
    276C  LYS      2.9    16.2    +      -       -      +
    277C  TYR      3.2     6.0    +      -       -      +
    279C  SER*     1.3    76.9    -      -       -      +
    281C  LEU*     1.3    63.2    +      -       -      +
    282C  THR      3.2     0.2    -      -       -      -
    283C  HIS*     3.3    10.6    +      -       -      +
    284C  ASP*     3.0    23.0    +      -       -      +
    338C  MET*     4.5    17.5    -      -       +      +
    339C  THR*     5.0     4.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 281 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     99C  PRO*     3.7    31.4    -      -       +      +
    113C  MET*     3.4    39.7    -      -       +      +
    114C  ARG*     4.0    19.3    -      -       +      -
    115C  PRO*     4.4     4.3    -      -       +      -
    244C  ILE*     4.6     4.7    -      -       +      -
    277C  TYR*     2.8    45.2    +      -       +      +
    278C  THR      3.5     0.4    +      -       -      +
    280C  ALA*     1.3    72.2    -      -       -      +
    282C  THR*     1.3    57.6    +      -       -      +
    283C  HIS      3.3     0.2    -      -       -      -
    284C  ASP*     3.4     6.5    +      -       -      +
    285C  ALA*     2.9    27.4    +      -       -      +
    339C  THR*     3.6    24.0    -      -       +      -
    350C  ARG*     4.3     5.6    -      -       -      +
----------------------------------------------------------
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Residues in contact with THR 282 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     19C  GLU*     3.9    28.3    -      -       +      +
     22C  ALA*     3.3    13.8    -      -       -      +
     23C  PHE*     4.4     8.2    -      -       -      -
     74C  PHE*     3.5    27.6    -      -       +      -
     76C  PHE*     4.0     1.1    -      -       +      -
     99C  PRO*     3.9     6.3    -      -       +      -
    278C  THR      3.2    14.7    +      -       -      +
    279C  SER*     2.6    27.0    +      -       -      -
    281C  LEU*     1.3    76.9    -      -       -      +
    283C  HIS*     1.3    61.9    +      -       -      +
    285C  ALA*     3.4    14.7    +      -       -      +
    286C  ILE*     3.4    22.5    -      -       -      +
----------------------------------------------------------
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Residues in contact with HIS 283 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     22C  ALA      4.6     2.4    +      -       -      +
     26C  ALA*     3.6    27.6    -      -       +      +
     29C  LEU*     4.4    18.8    -      -       +      -
    251C  MET*     6.2     2.4    -      -       -      +
    255C  PHE*     3.7    35.1    -      +       +      +
    279C  SER      4.5     3.8    -      -       -      +
    280C  ALA      3.3     9.7    +      -       -      +
    282C  THR*     1.3    80.4    +      -       -      +
    284C  ASP*     1.3    63.0    +      -       -      +
    286C  ILE*     3.4    13.6    +      -       +      +
    287C  LEU*     3.4    35.1    +      -       +      +
    338C  MET*     3.6    34.6    -      -       +      +
----------------------------------------------------------
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Residues in contact with ASP 284 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    113C  MET*     3.6    14.6    -      -       +      -
    280C  ALA      3.0    14.6    -      -       -      +
    281C  LEU*     3.4    10.5    +      -       -      +
    282C  THR      3.3     0.4    -      -       -      -
    283C  HIS*     1.3    76.2    -      -       -      +
    285C  ALA*     1.3    58.9    +      -       -      +
    286C  ILE      3.3     0.2    -      -       -      -
    287C  LEU*     3.2    11.2    +      -       -      +
    288C  VAL*     3.1    31.4    +      -       -      +
    337C  GLY*     3.9     3.8    -      -       -      -
    338C  MET*     2.8    39.1    +      -       -      +
    339C  THR*     2.7    31.7    +      -       +      +
    342C  ILE*     3.4    10.4    -      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 285 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     74C  PHE*     3.5    30.1    -      -       +      -
     97C  VAL*     3.8    14.6    -      -       +      +
    113C  MET*     4.0    13.5    -      -       +      -
    281C  LEU      2.9    14.8    +      -       -      +
    282C  THR      3.4    12.1    -      -       -      +
    283C  HIS      3.2     0.4    -      -       -      -
    284C  ASP*     1.3    75.9    -      -       -      +
    286C  ILE*     1.3    62.4    +      -       +      +
    288C  VAL*     3.6     3.2    +      -       -      +
    289C  ILE*     3.3    29.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 286 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      8C  ILE*     6.2     1.1    -      -       +      -
     23C  PHE*     3.6    37.5    -      -       +      +
     26C  ALA*     3.9    37.0    -      -       +      +
     27C  VAL*     4.3    14.1    -      -       +      +
     30C  TYR*     4.9    11.0    -      -       +      -
     43C  LEU*     4.9    10.8    -      -       +      -
    282C  THR      3.4    16.4    -      -       -      +
    283C  HIS*     3.4    10.0    +      -       +      +
    284C  ASP      3.3     0.6    -      -       -      -
    285C  ALA*     1.3    79.1    -      -       +      +
    287C  LEU*     1.3    58.2    +      -       +      +
    288C  VAL      3.2     0.2    -      -       -      -
    289C  ILE*     3.3    12.2    +      -       +      +
    290C  ALA*     2.8    38.3    +      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 287 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    251C  MET*     5.5     3.8    -      -       -      -
    283C  HIS*     3.4    41.9    +      -       +      +
    284C  ASP*     3.2    12.0    +      -       +      +
    286C  ILE*     1.3    82.0    -      -       +      +
    288C  VAL*     1.3    59.4    +      -       -      +
    290C  ALA*     4.1     7.6    -      -       +      +
    291C  GLU*     3.7    17.8    +      -       -      +
    294C  ARG*     5.4     2.6    +      -       -      +
    335C  VAL*     3.9    25.3    -      -       +      +
    336C  GLN      4.3     7.6    -      -       -      +
    337C  GLY*     3.8    26.5    -      -       -      -
    342C  ILE*     5.3     1.6    -      -       +      -
----------------------------------------------------------
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Residues in contact with VAL 288 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     97C  VAL*     5.8     2.5    -      -       +      -
    111C  ILE*     4.6     6.3    -      -       +      -
    113C  MET*     3.8    24.9    -      -       +      -
    284C  ASP      3.1    14.6    +      -       -      +
    285C  ALA      3.8     7.6    -      -       -      +
    286C  ILE      3.2     0.4    -      -       -      -
    287C  LEU*     1.3    77.7    -      -       -      +
    289C  ILE*     1.3    65.0    +      -       +      +
    292C  ALA*     3.2    23.0    +      -       -      +
    330C  LEU*     3.7    25.8    -      -       +      +
    333C  VAL*     3.8    21.5    -      -       +      +
    335C  VAL*     4.6     9.6    -      -       +      -
    342C  ILE*     3.9    18.8    -      -       +      -
    344C  PHE*     4.2     8.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with ILE 289 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      6C  ILE*     6.0     0.2    -      -       +      -
      8C  ILE*     4.2    36.3    -      -       +      -
     23C  PHE*     5.7     0.2    -      -       +      -
     41C  PHE*     6.4     0.2    -      -       +      -
     43C  LEU*     4.6    17.3    -      -       +      -
     72C  ALA*     5.1     6.7    -      -       +      -
     74C  PHE*     5.3     6.5    -      -       +      -
     97C  VAL*     4.4    20.9    -      -       +      -
    285C  ALA*     3.3    20.6    +      -       +      +
    286C  ILE*     3.3    15.8    +      -       +      +
    288C  VAL*     1.3    77.2    -      -       +      +
    290C  ALA*     1.3    61.7    -      -       -      +
    292C  ALA*     3.4     0.3    +      -       -      +
    293C  PHE*     3.1    50.7    +      -       +      +
    330C  LEU*     4.2    17.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 290 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     30C  TYR*     4.3    16.4    -      -       +      -
     41C  PHE*     4.4     7.8    -      -       -      -
     43C  LEU*     6.2     1.8    -      -       -      -
    286C  ILE*     2.8    25.5    +      -       +      +
    287C  LEU*     4.3     8.7    -      -       +      +
    288C  VAL      3.4     0.2    -      -       -      -
    289C  ILE*     1.3    74.6    -      -       -      +
    291C  GLU*     1.3    57.4    +      -       -      +
    293C  PHE*     4.0     1.7    -      -       -      +
    294C  ARG*     3.2    58.1    +      -       -      +
----------------------------------------------------------
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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
----------------------------------------------------------
    287C  LEU      3.7     8.4    +      -       -      +
    289C  ILE      3.4     0.2    -      -       -      -
    290C  ALA*     1.3    77.8    -      -       -      +
    292C  ALA*     1.3    60.3    +      -       -      +
    293C  PHE      3.4     0.2    -      -       -      -
    294C  ARG*     3.1    34.1    +      -       -      +
    295C  TYR*     3.0    29.5    +      -       +      +
    333C  VAL*     4.3    14.7    -      -       +      +
    334C  GLN      5.6     1.6    -      -       -      +
    335C  VAL*     3.8    32.4    -      -       +      +
----------------------------------------------------------
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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
----------------------------------------------------------
    288C  VAL      3.2    19.8    +      -       -      +
    289C  ILE      3.8     2.5    -      -       -      +
    291C  GLU*     1.3    78.3    -      -       -      +
    293C  PHE*     1.3    60.9    +      -       +      +
    295C  TYR*     3.4     6.4    +      -       -      +
    296C  LEU*     3.1    31.2    +      -       +      +
    329C  ALA*     3.8    28.5    -      -       +      +
    330C  LEU*     3.8    22.9    -      -       +      -
    333C  VAL*     4.0     7.8    -      -       +      +
----------------------------------------------------------
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Residues in contact with PHE 293 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      6C  ILE*     3.6    39.2    -      -       +      +
     41C  PHE*     3.5    23.9    -      +       +      -
     43C  LEU*     6.3     0.2    -      -       +      -
     71C  TYR*     3.8    25.8    -      +       +      -
     72C  ALA*     4.6    13.5    -      -       +      -
    289C  ILE*     3.1    48.2    +      -       +      +
    292C  ALA*     1.3    80.5    -      -       +      +
    294C  ARG*     1.3    58.4    +      -       -      +
    295C  TYR      3.3     0.2    -      -       -      -
    296C  LEU*     3.6    18.2    -      -       +      +
    297C  ARG*     3.1    26.2    +      -       -      +
    303C  VAL*     4.9     5.8    -      -       +      -
    326C  ILE*     3.5    31.6    -      -       +      -
    330C  LEU*     5.4     4.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with ARG 294 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     30C  TYR*     3.3    33.1    -      -       -      -
     40C  PRO*     3.9    26.3    -      -       +      +
     41C  PHE*     3.7    16.2    -      -       +      -
    287C  LEU*     5.4     2.8    +      -       -      +
    290C  ALA*     3.2    40.0    +      -       -      +
    291C  GLU*     3.1    38.6    +      -       -      +
    292C  ALA      3.3     0.4    -      -       -      -
    293C  PHE*     1.3    74.4    -      -       -      +
    295C  TYR*     1.3    59.7    +      -       -      +
    296C  LEU      3.3     0.4    -      -       -      -
    297C  ARG*     3.4    12.3    +      -       +      +
    298C  ARG*     3.2    21.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with TYR 295 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    108B  GLN*     4.3     9.1    +      -       -      -
    346B  THR*     5.1     3.0    +      -       -      -
    347B  TYR*     4.0    22.5    +      -       -      -
    291C  GLU*     3.0    19.9    +      -       +      +
    292C  ALA*     3.5     8.5    -      -       -      +
    293C  PHE      3.3     0.2    -      -       -      -
    294C  ARG*     1.3    75.2    -      -       -      +
    296C  LEU*     1.3    65.4    +      -       +      +
    297C  ARG      3.1     0.4    -      -       -      -
    298C  ARG*     3.2    22.1    +      -       +      +
    299C  GLN*     3.4    34.9    +      -       +      +
    329C  ALA*     4.5    12.1    -      -       +      +
    332C  MET*     3.8    38.2    -      -       +      +
    333C  VAL*     5.9     1.6    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 296 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    292C  ALA*     3.1    21.4    +      -       +      +
    293C  PHE*     3.6    29.6    -      -       +      +
    294C  ARG      3.3     0.4    -      -       -      -
    295C  TYR*     1.3    77.2    -      -       +      +
    297C  ARG*     1.3    56.3    +      -       -      +
    299C  GLN*     3.6     1.3    +      -       -      -
    300C  ARG*     3.0    22.3    +      -       -      -
    301C  VAL*     3.0    50.7    +      -       +      +
    303C  VAL*     4.7     9.9    -      -       +      -
    325C  ASP      3.9    20.6    -      -       -      +
    326C  ILE*     3.7    26.9    -      -       +      -
    329C  ALA*     4.3    11.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with ARG 297 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      3C  PRO      4.5    15.4    +      -       -      -
      4C  ASN*     3.7    22.4    +      -       -      +
     40C  PRO*     4.1    29.2    +      -       -      +
     41C  PHE*     4.3    20.1    -      -       +      +
    293C  PHE      3.1    18.0    +      -       -      +
    294C  ARG*     3.4    14.6    -      -       -      +
    295C  TYR      3.1     0.4    -      -       -      -
    296C  LEU*     1.3    75.8    -      -       -      +
    298C  ARG*     1.3    62.8    +      -       -      +
    299C  GLN      3.3     0.2    -      -       -      -
    300C  ARG*     3.3    14.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 298 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    294C  ARG      3.2    12.1    +      -       -      +
    295C  TYR*     3.2    18.6    +      -       +      +
    297C  ARG*     1.3    77.4    -      -       -      +
    299C  GLN*     1.3    75.4    +      -       -      +
    300C  ARG      3.8     0.2    +      -       -      -
----------------------------------------------------------
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Residues in contact with GLN 299 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    108B  GLN*     4.4    25.7    +      -       -      +
    324B  ILE*     4.3    18.1    -      -       +      +
    295C  TYR*     3.4    41.7    +      -       +      +
    296C  LEU*     3.6     1.1    +      -       -      +
    298C  ARG*     1.3    92.3    -      -       -      +
    300C  ARG*     1.3    60.2    +      -       -      +
    301C  VAL*     3.1    29.9    +      -       +      +
----------------------------------------------------------
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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