Contacts of the helix formed by residues 338 - 363 (chain E) in PDB entry 5KRA


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 SER 338 (chain E).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    337E  PHE*     1.3    76.3    -      -       -      +
    339E  GLU*     1.3    77.1    +      -       -      +
    340E  ALA*     3.8     6.4    +      -       -      +
    341E  SER*     2.9    24.4    +      -       -      -
    342E  MET*     3.3    17.2    -      -       -      +
    417E  CYS*     4.6     5.5    -      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 339 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    338E  SER*     1.3    83.2    +      -       -      +
    340E  ALA*     1.3    62.9    +      -       +      +
    341E  SER      3.3     0.9    +      -       -      -
    342E  MET*     3.8     2.1    -      -       -      +
    343E  MET*     3.4    24.9    +      -       -      +
    417E  CYS      5.2     2.7    -      -       -      +
    418E  VAL*     4.0    27.6    -      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 340 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    338E  SER*     3.8     3.5    +      -       -      +
    339E  GLU*     1.3    79.7    -      -       +      +
    341E  SER*     1.3    57.4    +      -       -      +
    342E  MET      3.5     0.2    -      -       -      -
    343E  MET*     4.5     5.1    -      -       -      +
    344E  GLY*     2.9    25.2    +      -       -      -
    533E  VAL*     4.4    23.8    -      -       +      +
    535E  PRO*     5.4     6.8    -      -       +      +
----------------------------------------------------------
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Residues in contact with SER 341 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    337E  PHE*     3.9     9.1    -      -       -      -
    338E  SER*     2.9    38.5    +      -       -      -
    339E  GLU      3.2     0.2    -      -       -      -
    340E  ALA*     1.3    77.5    -      -       -      +
    342E  MET*     1.3    67.5    +      -       -      +
    344E  GLY*     3.8     1.0    -      -       -      -
    345E  LEU*     3.1    32.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with MET 342 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    337E  PHE*     3.9    40.8    -      -       +      -
    338E  SER      3.3    16.9    +      -       -      +
    339E  GLU*     3.4     3.6    +      -       -      +
    341E  SER*     1.3    84.0    +      -       -      +
    343E  MET*     1.3    80.6    +      -       +      +
    345E  LEU*     3.3     7.8    +      -       -      +
    346E  LEU*     3.2    37.7    +      -       -      +
    408E  LEU*     6.0     1.8    -      -       -      -
    410E  LEU*     3.8    25.4    -      -       +      -
    414E  GLN*     3.6    35.0    -      -       +      +
    417E  CYS*     4.3     7.2    -      -       +      -
    418E  VAL      5.8     1.8    -      -       -      +
----------------------------------------------------------
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Residues in contact with MET 343 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    339E  GLU      3.4    16.1    +      -       -      +
    340E  ALA*     4.5     4.7    -      -       -      +
    342E  MET*     1.3    92.6    -      -       +      +
    344E  GLY*     1.3    61.7    +      -       -      +
    346E  LEU*     3.3    26.5    +      -       +      -
    347E  THR*     2.9    37.4    +      -       -      +
    418E  VAL*     4.5    12.3    -      -       +      +
    421E  MET*     3.6    27.8    -      -       +      +
    524E  HIS*     4.1    12.1    -      -       +      -
    528E  MET*     3.6    42.2    -      -       +      +
    535E  PRO*     6.1     4.0    -      -       +      -
    601E  6WS      6.1     2.0    -      -       -      -
----------------------------------------------------------
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Residues in contact with GLY 344 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    330E  GLU*     4.3     2.6    -      -       -      +
    340E  ALA      2.9    21.5    +      -       -      -
    341E  SER*     3.8     1.8    -      -       -      -
    342E  MET      3.2     0.4    -      -       -      -
    343E  MET*     1.3    76.9    -      -       -      +
    345E  LEU*     1.3    61.2    +      -       -      +
    347E  THR*     3.3     6.5    +      -       -      -
    348E  ASN*     3.1    26.9    +      -       -      +
    535E  PRO*     5.4    12.1    -      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 345 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    329E  SER*     3.8    20.7    +      -       -      +
    330E  GLU*     3.6    38.3    -      -       +      +
    331E  TYR*     5.5     6.3    -      -       +      -
    337E  PHE*     3.8    31.4    -      -       +      -
    341E  SER*     3.1    21.9    +      -       -      +
    342E  MET*     3.6     7.0    -      -       -      +
    344E  GLY*     1.3    76.1    -      -       -      +
    346E  LEU*     1.3    60.7    +      -       +      +
    348E  ASN*     3.8     3.9    -      -       -      +
    349E  LEU*     3.0    29.5    +      -       -      +
    352E  ARG*     5.3     0.5    +      -       -      -
    408E  LEU*     4.5    14.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 346 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    342E  MET*     3.2    23.2    +      -       -      +
    343E  MET*     3.3    32.9    +      -       +      +
    345E  LEU*     1.3    75.0    -      -       -      +
    347E  THR*     1.3    61.2    +      -       +      +
    349E  LEU*     3.3     7.1    +      -       +      +
    350E  ALA*     2.8    28.8    +      -       -      +
    404E  PHE*     3.6    38.6    -      -       +      -
    408E  LEU*     4.1    17.0    -      -       +      -
    410E  LEU*     4.8     4.3    -      -       +      -
    421E  MET*     5.0     0.4    -      -       -      -
    601E  6WS      3.6    41.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with THR 347 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    343E  MET*     2.9    24.9    +      -       -      +
    344E  GLY*     3.3     8.5    +      -       -      -
    346E  LEU*     1.3    74.4    -      -       +      +
    348E  ASN*     1.3    62.4    +      -       -      +
    350E  ALA*     3.6     7.9    -      -       -      +
    351E  ASP*     3.0    29.8    +      -       -      +
    525E  LEU*     4.7     7.4    -      -       +      -
    528E  MET*     3.8    18.2    -      -       +      -
    535E  PRO*     3.5    17.6    +      -       +      +
    536E  LEU*     3.6    31.2    -      -       +      -
    540E  LEU*     4.1     9.6    -      -       +      +
    601E  6WS      5.3     4.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with ASN 348 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    330E  GLU*     3.3    36.3    +      -       -      +
    344E  GLY      3.1    16.9    +      -       -      +
    345E  LEU      3.8     3.4    -      -       -      +
    347E  THR*     1.3    81.6    +      -       -      +
    349E  LEU*     1.3    61.2    +      -       -      +
    351E  ASP*     3.6     5.9    +      -       -      +
    352E  ARG*     3.1    56.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 349 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    327E  LEU*     4.2    19.3    -      -       +      +
    328E  TYR      4.1    12.6    -      -       -      +
    329E  SER*     4.8     2.7    -      -       -      +
    345E  LEU      3.0    17.3    +      -       -      +
    346E  LEU*     3.5     6.1    -      -       +      +
    348E  ASN*     1.3    77.0    +      -       -      +
    350E  ALA*     1.3    63.9    +      -       -      +
    352E  ARG*     3.4    23.6    +      -       -      +
    353E  GLU*     3.0    41.1    +      -       +      +
    404E  PHE*     3.3    41.7    -      -       +      +
    405E  ALA*     4.4     5.4    -      -       +      -
    408E  LEU*     4.8     7.9    -      -       +      -
    601E  6WS      4.5    11.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 350 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    346E  LEU      2.8    17.2    +      -       -      +
    347E  THR*     3.3     8.3    +      -       -      +
    349E  LEU*     1.3    77.4    -      -       -      +
    351E  ASP*     1.3    56.5    +      -       -      +
    353E  GLU*     3.3     4.1    +      -       -      +
    354E  LEU*     2.9    33.9    +      -       -      +
    387E  LEU*     4.3    12.2    -      -       +      +
    540E  LEU*     4.5     9.4    -      -       +      -
    601E  6WS      3.6    37.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with ASP 351 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    347E  THR      3.0    16.8    +      -       -      +
    348E  ASN*     3.9     6.9    -      -       -      +
    349E  LEU      3.3     0.2    -      -       -      -
    350E  ALA*     1.3    76.6    -      -       -      +
    352E  ARG*     1.3    67.8    +      -       -      +
    354E  LEU*     3.4    20.9    +      -       -      +
    355E  VAL*     3.5    14.6    -      -       -      +
    537E  SER*     2.6    38.6    +      -       -      +
    539E  LEU*     4.0    18.4    -      -       -      +
    540E  LEU*     4.5     4.1    +      -       +      +
----------------------------------------------------------
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Residues in contact with ARG 352 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    327E  LEU*     3.8    30.6    -      -       +      +
    328E  TYR      2.8    29.9    +      -       -      +
    329E  SER*     3.9     9.5    -      -       -      +
    330E  GLU*     4.2     6.0    -      -       -      +
    345E  LEU      5.3     0.4    +      -       -      -
    348E  ASN*     3.1    36.6    +      -       -      +
    349E  LEU*     3.8    22.1    -      -       -      +
    350E  ALA      3.3     0.4    -      -       -      -
    351E  ASP*     1.3    83.6    -      -       -      +
    353E  GLU*     1.3    60.8    +      -       -      +
    355E  VAL*     3.4    14.9    +      -       -      +
    356E  HIS*     3.3    20.7    +      -       +      -
----------------------------------------------------------
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Residues in contact with GLU 353 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    325E  PRO      5.7     2.9    -      -       -      +
    326E  ILE*     6.0     0.2    -      -       -      -
    327E  LEU*     3.8    27.5    +      -       +      +
    349E  LEU*     3.0    31.7    +      -       +      +
    350E  ALA*     3.3     2.2    +      -       -      +
    352E  ARG*     1.3    74.9    -      -       -      +
    354E  LEU*     1.3    59.2    +      -       -      +
    356E  HIS*     3.3     6.3    +      -       -      +
    357E  MET*     2.9    27.9    +      -       -      +
    387E  LEU*     3.6    28.8    -      -       +      +
    394E  ARG*     3.1    33.0    +      -       -      -
    404E  PHE      4.3     0.7    -      -       -      +
    601E  6WS      3.5    16.6    -      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 354 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    350E  ALA      2.9    17.2    +      -       -      +
    351E  ASP*     3.5     8.5    -      -       -      +
    353E  GLU*     1.3    77.0    -      -       -      +
    355E  VAL*     1.3    61.1    +      -       -      +
    357E  MET*     3.2    29.8    +      -       +      +
    358E  ILE*     3.1    35.7    +      -       +      +
    383E  TRP*     4.0    24.0    -      -       +      -
    387E  LEU*     4.7     2.9    -      -       +      +
    539E  LEU*     4.2    19.7    -      -       +      -
    540E  LEU*     3.8    31.0    -      -       +      +
    543E  MET*     3.9    27.8    -      -       +      -
----------------------------------------------------------
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Residues in contact with VAL 355 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    351E  ASP*     3.5    18.6    -      -       -      +
    352E  ARG*     3.7    10.1    -      -       -      +
    353E  GLU      3.3     0.6    -      -       -      -
    354E  LEU*     1.3    76.8    -      -       -      +
    356E  HIS*     1.3    62.1    +      -       +      +
    358E  ILE*     3.5     9.7    +      -       -      +
    359E  ASN*     2.7    42.7    +      -       -      +
    539E  LEU*     4.3    15.0    -      -       +      -
    693G  LEU*     4.7    15.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with HIS 356 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    324E  PRO*     4.2    18.8    -      -       +      +
    325E  PRO*     3.7    28.8    -      -       +      +
    327E  LEU*     3.6    30.0    -      -       +      +
    352E  ARG*     3.3    23.3    +      -       +      -
    353E  GLU*     3.3     8.2    +      -       -      +
    354E  LEU      3.2     0.4    -      -       -      -
    355E  VAL*     1.3    80.0    -      -       +      +
    357E  MET*     1.3    60.1    +      -       -      +
    359E  ASN*     3.4     6.1    +      -       -      +
    360E  TRP*     2.8    28.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with MET 357 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    324E  PRO*     5.1     2.9    -      -       -      +
    353E  GLU      2.9    14.8    +      -       -      +
    354E  LEU*     3.2    20.6    +      -       +      +
    356E  HIS*     1.3    76.4    -      -       -      +
    358E  ILE*     1.3    56.8    +      -       -      +
    360E  TRP*     3.1    25.7    +      -       +      -
    361E  ALA*     2.8    31.7    +      -       -      +
    379E  LEU*     4.1    13.5    -      -       +      -
    383E  TRP*     3.2    37.5    -      -       -      +
    386E  ILE*     3.7    33.2    -      -       +      -
    387E  LEU*     3.7    24.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with ILE 358 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    354E  LEU*     3.1    27.7    +      -       +      +
    355E  VAL*     3.8     6.1    -      -       -      +
    356E  HIS      3.3     0.2    -      -       -      -
    357E  MET*     1.3    78.1    -      -       +      +
    359E  ASN*     1.3    63.4    +      -       -      +
    361E  ALA*     3.4    13.2    +      -       -      +
    362E  LYS*     3.3    17.5    +      -       -      +
    379E  LEU*     4.3     9.4    -      -       +      -
    539E  LEU*     4.7     7.9    -      -       +      -
    543E  MET*     6.0     0.9    -      -       +      -
    690G  LEU*     3.6    27.4    -      -       +      -
    693G  LEU*     3.6    52.0    -      -       +      +
    694G  LEU*     3.7    25.8    -      -       +      +
----------------------------------------------------------
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Residues in contact with ASN 359 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    355E  VAL*     2.7    34.8    +      -       -      +
    356E  HIS*     3.4     7.6    +      -       -      +
    357E  MET      3.3     0.4    -      -       -      -
    358E  ILE*     1.3    77.7    -      -       -      +
    360E  TRP*     1.3    64.5    +      -       -      +
    361E  ALA      3.3     0.2    -      -       -      -
    362E  LYS*     3.6    34.5    +      -       +      +
    363E  ARG*     3.4    22.7    +      -       -      +
    693G  LEU*     4.6     3.5    +      -       -      +
    696G  ASP      4.7     4.3    -      -       -      +
----------------------------------------------------------
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Residues in contact with TRP 360 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    319E  LEU*     5.0     3.6    +      -       -      +
    322E  ALA*     3.1    39.0    -      -       +      +
    323E  GLU*     4.1     4.2    +      -       -      -
    324E  PRO*     3.7    21.8    -      -       +      -
    356E  HIS      2.8    18.3    +      -       -      +
    357E  MET*     3.3    34.1    -      -       +      +
    359E  ASN*     1.3    76.6    -      -       -      +
    361E  ALA*     1.3    71.1    +      -       +      +
    363E  ARG*     3.0    14.3    +      -       -      +
    364E  VAL*     3.3    29.8    +      -       +      +
    379E  LEU*     5.3     0.2    -      -       +      -
    386E  ILE*     3.7    28.3    -      -       +      -
    446E  VAL*     5.4     0.6    -      -       -      +
    449E  LYS*     3.7    50.5    -      -       +      +
    450E  SER*     4.3    11.6    +      -       -      -
    453E  LEU*     3.9    24.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 361 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    357E  MET      2.8    16.3    +      -       -      +
    358E  ILE      3.5    10.5    -      -       -      +
    359E  ASN      3.3     0.2    -      -       -      -
    360E  TRP*     1.3    81.8    -      -       +      +
    362E  LYS*     1.3    61.6    +      -       -      +
    364E  VAL*     3.1    16.0    +      -       -      +
    367E  PHE*     3.1    43.8    -      -       +      +
    379E  LEU*     4.0    15.5    -      -       +      -
    453E  LEU*     4.0    13.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with LYS 362 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    466B  LEU*     4.2     7.6    -      -       -      +
    358E  ILE*     3.3    16.2    -      -       -      +
    359E  ASN*     3.6    26.3    +      -       +      +
    360E  TRP      3.2     0.6    -      -       -      -
    361E  ALA*     1.3    77.7    -      -       -      +
    363E  ARG*     1.3    60.8    +      -       +      +
    364E  VAL      3.2     5.5    +      -       -      +
    367E  PHE*     4.4     6.7    -      -       +      -
    368E  VAL*     4.4    24.6    +      -       +      +
    375E  GLN*     5.7     1.8    -      -       -      +
    693G  LEU      2.7    30.1    +      -       -      -
    694G  LEU*     3.3    31.3    +      -       +      +
    696G  ASP      3.2    30.1    +      -       -      -
----------------------------------------------------------
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Residues in contact with ARG 363 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    466B  LEU*     3.7    49.4    -      -       +      +
    467B  LYS*     5.1     6.5    -      -       -      +
    318E  ALA*     4.2     7.4    +      -       -      +
    321E  ASP*     3.5    23.2    +      -       -      -
    322E  ALA*     3.5    47.3    -      -       +      +
    359E  ASN      3.4    17.3    -      -       -      +
    360E  TRP*     3.0     5.8    +      -       -      +
    362E  LYS*     1.3    77.2    -      -       +      +
    364E  VAL*     1.3    60.7    +      -       -      +
    365E  PRO*     3.2    12.6    -      -       -      +
----------------------------------------------------------
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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