Contacts of the helix formed by residues 221 - 245 (chain E) in PDB entry 5I4V


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 221 (chain E).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    511B  LYS*     5.8     6.3    -      -       -      +
    512B  LEU*     6.2     0.7    -      -       +      -
    219E  GLN*     3.9     2.9    +      -       -      +
    220E  LEU*     1.3    75.7    -      -       -      +
    222E  ALA*     1.3    58.0    +      -       +      +
    223E  ALA*     3.3    25.6    -      -       +      +
    224E  GLN*     3.0    28.0    +      -       +      +
    225E  GLU*     2.8    33.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 222 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    508B  PHE*     4.8    17.3    -      -       +      -
    220E  LEU      3.7     1.2    +      -       -      -
    221E  THR*     1.3    73.5    -      -       +      +
    223E  ALA*     1.3    64.2    +      -       -      +
    225E  GLU*     3.0    11.3    +      -       -      +
    226E  LEU*     2.9    32.9    +      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 223 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    508B  PHE*     4.0    37.9    -      -       +      +
    509B  PHE*     4.6     2.3    -      -       -      -
    511B  LYS*     5.3     6.7    -      -       +      +
    512B  LEU*     3.9    28.0    -      -       +      +
    221E  THR*     3.3    15.2    -      -       +      +
    222E  ALA*     1.3    79.8    -      -       -      +
    224E  GLN*     1.3    57.5    +      -       -      +
    226E  LEU*     3.2     3.1    +      -       -      +
    227E  MET*     3.0    28.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLN 224 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    512B  LEU*     4.6    16.4    -      -       +      +
    219E  GLN      3.9     5.7    -      -       -      +
    220E  LEU*     3.7    15.1    -      -       +      -
    221E  THR*     3.0    40.2    +      -       +      +
    223E  ALA*     1.3    75.4    -      -       -      +
    225E  GLU*     1.3    67.2    +      -       -      +
    227E  MET*     3.3     7.3    +      -       -      +
    228E  ILE*     3.1    30.0    +      -       +      +
    398E  PRO      5.0     0.8    +      -       -      +
    401E  GLU*     4.0    13.7    +      -       -      +
    402E  ALA*     3.7    38.8    -      -       +      +
    405E  SER*     3.9    10.3    +      -       -      -
----------------------------------------------------------
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Residues in contact with GLU 225 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    437A  GLU*     3.2    40.7    -      -       -      +
    440A  PHE*     3.8    38.3    -      -       +      +
    220E  LEU*     4.2    18.6    -      -       +      +
    221E  THR      2.8    16.0    +      -       -      +
    222E  ALA*     3.0    13.1    +      -       -      +
    224E  GLN*     1.3    73.1    -      -       -      +
    226E  LEU*     1.3    60.9    +      -       +      +
    228E  ILE*     3.4     2.3    +      -       -      +
    229E  GLN*     2.9    37.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 226 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    437A  GLU*     5.5     8.3    -      -       +      +
    501B  LEU      5.9     0.2    -      -       -      +
    504B  LEU*     5.9     0.9    -      -       +      -
    505B  GLU*     4.2    34.1    -      -       +      +
    508B  PHE*     3.5    35.4    -      -       +      -
    509B  PHE*     3.8    13.1    -      -       +      -
    222E  ALA*     2.9    21.9    +      -       +      +
    223E  ALA*     3.7     4.5    -      -       -      +
    225E  GLU*     1.3    76.5    -      -       +      +
    227E  MET*     1.3    61.1    +      -       -      +
    229E  GLN*     3.5    22.8    -      -       -      +
    230E  GLN*     2.9    27.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with MET 227 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    509B  PHE*     3.6    23.3    -      -       +      -
    512B  LEU*     3.4    36.8    -      -       +      -
    513B  ILE*     4.3    12.8    -      -       +      -
    223E  ALA      3.0    15.3    +      -       -      +
    224E  GLN*     3.7     5.6    -      -       -      +
    226E  LEU*     1.3    74.7    -      -       -      +
    228E  ILE*     1.3    68.4    +      -       +      +
    230E  GLN*     3.1     4.3    +      -       -      +
    231E  LEU*     3.0    24.8    +      -       +      +
    290E  PRO*     4.7     8.3    -      -       +      -
    372E  LEU*     5.9     0.2    -      -       +      -
    398E  PRO*     5.0     9.6    -      -       +      +
    399E  TYR*     3.3    53.8    -      -       +      +
    402E  ALA*     5.3     7.4    -      -       -      -
----------------------------------------------------------
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Residues in contact with ILE 228 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    440A  PHE*     3.9    16.8    -      -       +      -
    220E  LEU*     4.5     8.3    -      -       +      -
    224E  GLN      3.1    17.9    +      -       -      +
    225E  GLU      3.7     3.4    -      -       -      +
    227E  MET*     1.3    74.8    -      -       +      +
    229E  GLN*     1.3    64.2    -      -       -      +
    231E  LEU*     3.1    10.2    +      -       +      +
    232E  VAL*     3.0    24.8    +      -       +      +
    368E  ALA*     3.6    36.8    -      -       +      +
    371E  ALA*     6.2     0.2    -      -       +      -
    372E  LEU*     3.9    27.8    -      -       +      -
    402E  ALA*     4.3    12.1    -      -       +      +
    406E  TYR*     3.6    30.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLN 229 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    436A  SER*     3.5    42.8    +      -       -      -
    437A  GLU*     4.3     2.9    -      -       -      +
    440A  PHE*     4.4    18.9    -      -       +      +
    443A  ARG*     5.3     5.8    -      -       -      +
    505B  GLU*     5.6     2.7    -      -       -      +
    225E  GLU*     2.9    26.7    +      -       -      +
    226E  LEU*     3.5    30.3    -      -       +      +
    228E  ILE*     1.3    77.1    -      -       -      +
    230E  GLN*     1.3    54.9    +      -       -      +
    232E  VAL*     3.5     6.1    +      -       -      +
    233E  ALA*     3.0    30.6    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLN 230 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    502B  LYS*     3.5    24.2    +      -       -      -
    505B  GLU*     3.7     6.0    +      -       -      +
    506B  HIS*     6.4     1.6    -      -       -      -
    509B  PHE*     3.8    27.0    -      -       +      -
    226E  LEU      2.9    15.2    +      -       -      +
    227E  MET      3.1     9.6    +      -       -      +
    229E  GLN*     1.3    77.0    -      -       -      +
    231E  LEU*     1.3    57.4    +      -       -      +
    233E  ALA*     3.3     7.9    +      -       -      +
    234E  ALA*     2.9    26.4    +      -       -      +
    288E  GLN*     3.5    45.5    +      -       -      +
    290E  PRO*     4.3     8.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 231 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    227E  MET*     3.0    18.5    +      -       +      +
    228E  ILE*     3.1     8.5    +      -       -      +
    230E  GLN*     1.3    73.3    -      -       -      +
    232E  VAL*     1.3    68.6    +      -       -      +
    234E  ALA*     3.1     7.7    +      -       +      +
    235E  GLN*     3.1    20.4    +      -       -      +
    285E  PHE*     3.6    13.0    -      -       +      -
    288E  GLN      5.0     1.3    -      -       -      +
    289E  VAL*     4.1    25.6    -      -       +      -
    290E  PRO*     4.1    26.2    -      -       +      -
    371E  ALA*     3.9    26.9    -      -       +      +
    372E  LEU*     3.9    31.4    -      -       +      +
    375E  ALA*     4.2     2.9    -      -       +      -
    399E  TYR*     4.0    15.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with VAL 232 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    443A  ARG*     3.9    33.9    -      -       -      +
    458A  ASP      5.3     1.3    -      -       -      +
    459A  VAL      4.7     0.7    -      -       -      +
    228E  ILE*     3.0    20.7    +      -       +      +
    229E  GLN      3.8     3.6    -      -       -      +
    231E  LEU*     1.3    76.9    -      -       -      +
    233E  ALA*     1.3    65.1    +      -       -      +
    235E  GLN*     3.3    13.2    +      -       -      +
    236E  LEU*     3.3    27.5    +      -       +      +
    367E  ASP*     4.1    14.4    -      -       +      +
    368E  ALA*     3.6    38.1    -      -       +      +
    371E  ALA*     4.4     6.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 233 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    458A  ASP*     6.2     2.5    -      -       +      -
    229E  GLN*     3.0    18.8    +      -       +      +
    230E  GLN*     3.6    10.3    -      -       -      +
    232E  VAL*     1.3    76.9    -      -       -      +
    234E  ALA*     1.3    63.3    +      -       -      +
    236E  LEU*     3.2    11.2    +      -       -      +
    237E  GLN*     3.1    25.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 234 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    230E  GLN*     2.9    19.6    +      -       -      +
    231E  LEU*     3.5     7.4    -      -       -      +
    233E  ALA*     1.3    76.6    -      -       -      +
    235E  GLN*     1.3    57.3    +      -       -      +
    237E  GLN*     3.5     4.9    +      -       -      +
    238E  CYS*     3.0    33.6    +      -       -      -
    285E  PHE*     3.9    17.7    -      -       +      -
    288E  GLN*     3.9    39.5    -      -       +      +
----------------------------------------------------------
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Residues in contact with GLN 235 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    231E  LEU      3.1    10.0    +      -       -      +
    232E  VAL*     3.7     9.0    -      -       -      +
    233E  ALA      3.3     0.2    -      -       -      -
    234E  ALA*     1.3    75.7    -      -       -      +
    236E  LEU*     1.3    60.7    +      -       +      +
    238E  CYS*     3.3     5.6    +      -       -      +
    239E  ASN*     2.8    39.9    +      -       -      +
    281E  GLU*     5.7     1.2    +      -       -      -
    285E  PHE*     3.5    29.6    -      -       +      -
    315E  GLU*     3.3    18.4    +      -       -      -
    318E  ARG*     3.0    42.1    +      -       -      +
    367E  ASP      4.1     0.2    -      -       -      +
    371E  ALA*     3.5    23.6    -      -       +      +
    374E  ILE*     3.6    13.6    -      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 236 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    458A  ASP*     3.4    42.6    -      -       +      +
    459A  VAL      4.4     4.9    -      -       -      +
    460A  HIS      3.6    17.3    -      -       -      +
    461A  GLU*     3.9    15.5    -      -       +      -
    464A  GLY      4.5     2.0    -      -       -      +
    465A  SER*     3.3    38.6    -      -       -      +
    232E  VAL*     3.3    25.5    +      -       +      +
    233E  ALA*     3.2     9.7    +      -       -      +
    235E  GLN*     1.3    74.3    -      -       +      +
    237E  GLN*     1.3    65.9    +      -       -      +
    239E  ASN*     3.3     7.8    +      -       -      +
    240E  LYS*     3.0    21.5    +      -       -      +
    367E  ASP*     5.7     1.1    -      -       -      +
----------------------------------------------------------
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Residues in contact with GLN 237 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    233E  ALA*     3.1    18.3    +      -       -      +
    234E  ALA*     3.6     6.2    -      -       -      +
    236E  LEU*     1.3    78.4    -      -       -      +
    238E  CYS*     1.3    60.2    +      -       -      +
    240E  LYS*     3.5    10.7    +      -       +      +
    241E  ARG*     3.4    46.2    +      -       -      +
    288E  GLN*     3.3    34.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with CYS 238 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    234E  ALA      3.0    25.6    +      -       -      +
    235E  GLN*     3.6     7.2    -      -       -      +
    236E  LEU      3.2     0.2    -      -       -      -
    237E  GLN*     1.3    75.6    -      -       -      +
    239E  ASN*     1.3    65.6    +      -       -      +
    241E  ARG*     3.3    12.9    +      -       -      +
    242E  SER*     3.1    23.2    +      -       -      -
    281E  GLU*     3.9    20.9    -      -       +      +
    284E  ASP*     3.6    16.8    -      -       +      +
    285E  PHE*     3.5    38.4    -      -       +      -
    288E  GLN*     4.1     9.4    -      -       -      -
----------------------------------------------------------
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Residues in contact with ASN 239 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    461A  GLU*     3.7    25.3    -      -       -      +
    465A  SER*     3.8    13.6    +      -       -      +
    235E  GLN*     2.8    29.6    +      -       -      +
    236E  LEU*     3.6    11.8    -      -       -      +
    238E  CYS*     1.3    75.7    -      -       -      +
    240E  LYS*     1.3    62.9    +      -       -      +
    242E  SER*     3.1     8.2    +      -       -      -
    243E  PHE*     2.9    36.3    +      -       +      -
    281E  GLU*     3.0    25.1    +      -       -      -
    315E  GLU*     4.4     3.1    +      -       -      +
    318E  ARG*     6.1     0.2    -      -       -      -
    319E  ARG*     3.3    20.7    -      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 240 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    385A  ASN*     5.1     9.5    +      -       -      -
    465A  SER*     3.5    30.2    -      -       -      +
    466A  GLY*     5.8     4.5    -      -       -      -
    469A  LYS*     6.3     3.1    -      -       -      +
    236E  LEU      3.0    10.2    +      -       -      +
    237E  GLN*     3.6    13.7    -      -       +      +
    238E  CYS      3.3     0.2    -      -       -      -
    239E  ASN*     1.3    75.9    -      -       -      +
    241E  ARG*     1.3    65.6    +      -       +      +
    243E  PHE*     3.2    11.6    +      -       -      +
    244E  SER*     3.1    23.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 241 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    237E  GLN*     3.4    47.4    +      -       -      +
    238E  CYS*     3.3    11.8    +      -       -      +
    239E  ASN      3.2     0.6    -      -       -      -
    240E  LYS*     1.3    81.7    -      -       +      +
    242E  SER*     1.3    63.5    +      -       -      +
    244E  SER*     3.2    25.3    -      -       -      +
    245E  ASP*     3.5    11.3    -      -       -      +
    284E  ASP*     2.9    48.0    +      -       -      +
    288E  GLN*     4.5     7.0    +      -       -      -
----------------------------------------------------------
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Residues in contact with SER 242 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    238E  CYS      3.1    10.6    +      -       -      -
    239E  ASN*     3.1     9.9    +      -       -      -
    241E  ARG*     1.3    77.6    -      -       -      +
    243E  PHE*     1.3    63.9    +      -       -      +
    245E  ASP*     3.0    20.3    +      -       -      +
    246E  GLN      3.8     0.9    +      -       -      -
    277E  ILE*     3.8    20.8    -      -       -      +
    281E  GLU*     2.6    39.9    +      -       -      +
    330E  LEU*     3.6    21.1    -      -       -      +
----------------------------------------------------------
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Residues in contact with PHE 243 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    461A  GLU*     4.5    13.5    -      -       -      -
    462A  GLY*     4.2     4.9    -      -       -      -
    465A  SER*     3.3    26.5    -      -       -      -
    467A  SER*     3.2    35.0    -      -       -      -
    239E  ASN*     2.9    32.8    +      -       +      -
    240E  LYS*     3.2    10.5    +      -       -      +
    242E  SER*     1.3    77.5    -      -       -      +
    244E  SER*     1.3    62.3    +      -       -      +
    246E  GLN*     3.1    23.0    +      -       -      +
    247E  PRO*     4.2     1.4    -      -       -      +
    319E  ARG*     5.4     5.6    -      -       -      -
    330E  LEU*     3.4    47.1    -      -       +      -
    331E  LYS*     3.8    10.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with SER 244 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    240E  LYS*     3.1    18.3    +      -       -      +
    241E  ARG*     3.2    15.7    +      -       -      +
    242E  SER      3.2     0.2    -      -       -      -
    243E  PHE*     1.3    76.0    -      -       -      +
    245E  ASP*     1.3    61.8    -      -       -      +
    247E  PRO*     3.2    18.7    -      -       -      +
----------------------------------------------------------
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Residues in contact with ASP 245 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    241E  ARG      3.5    12.1    +      -       -      +
    242E  SER*     3.0    14.9    +      -       -      +
    244E  SER*     1.3    78.1    -      -       -      +
    246E  GLN*     1.3    64.3    +      -       -      +
    247E  PRO*     3.4     2.7    -      -       -      -
    248E  LYS*     3.1    43.1    +      -       +      +
    249E  VAL*     3.6    10.0    -      -       -      +
    277E  ILE*     3.8    22.4    -      -       +      +
    280E  GLN*     4.4    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