Contacts of the helix formed by residues 239 - 266 (chain C) in PDB entry 6A5T


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 239 (chain C).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     14C  ASP*     4.3    18.8    -      -       +      +
     74C  GLU*     2.6    40.4    +      -       +      +
    238C  LEU*     1.3    76.3    -      -       -      +
    240C  ALA*     1.3    56.0    +      -       -      +
    241C  ASN*     3.0    17.6    -      -       -      +
    242C  GLN*     2.3    61.7    +      -       -      +
    243C  VAL*     3.0     3.3    +      -       -      -
----------------------------------------------------------
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Residues in contact with ALA 240 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     13C  GLN      4.7     0.7    -      -       -      +
     14C  ASP*     3.2    24.7    +      -       -      +
     15C  ASP      3.9    13.0    -      -       -      +
     17C  VAL*     3.5    30.7    -      -       +      -
    232C  VAL*     4.7     7.5    -      -       +      +
    234C  THR*     4.4     3.3    +      -       +      +
    238C  LEU      3.8     2.0    +      -       -      -
    239C  LYS*     1.3    69.5    -      -       -      +
    241C  ASN*     1.3    59.0    +      -       -      +
    243C  VAL*     2.9    37.0    +      -       +      +
    244C  PHE*     3.0     7.4    +      -       -      +
    109K  TRP*     5.5     0.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with ASN 241 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     17C  VAL*     5.1     1.0    -      -       -      +
    239C  LYS*     2.9    26.0    -      -       -      +
    240C  ALA*     1.3    74.2    -      -       -      +
    242C  GLN*     1.3    69.1    +      -       -      +
    244C  PHE*     3.3     2.1    +      -       -      +
    245C  SER*     2.8    35.6    +      -       -      +
    105K  PHE*     4.2    19.0    -      -       +      -
    106K  ASN*     6.1     1.1    -      -       -      +
    109K  TRP*     2.9    56.4    -      -       +      +
----------------------------------------------------------
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Residues in contact with GLN 242 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     74C  GLU*     3.4    48.2    +      -       -      +
    238C  LEU*     4.5     5.4    -      -       +      +
    239C  LYS*     2.3    54.3    +      -       -      +
    241C  ASN*     1.3    76.0    +      -       -      +
    243C  VAL*     1.3    64.8    +      -       -      +
    245C  SER*     4.3     6.1    -      -       -      -
    246C  ARG*     2.8    52.6    +      -       +      +
----------------------------------------------------------
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Residues in contact with VAL 243 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     36C  MET*     4.0    16.5    -      -       +      +
     40C  VAL*     4.6     7.4    -      -       +      +
    172C  PRO*     5.5     0.2    -      -       +      -
    173C  CYS*     3.3    24.7    -      -       -      -
    232C  VAL*     3.7    17.3    -      -       +      -
    234C  THR*     3.4    31.6    -      -       +      -
    238C  LEU*     4.5    17.2    -      -       +      +
    239C  LYS      3.0     4.7    +      -       -      +
    240C  ALA*     2.9    23.4    +      -       -      +
    242C  GLN*     1.3    80.7    -      -       -      +
    244C  PHE*     1.3    57.4    +      -       +      +
    246C  ARG*     3.6     3.3    -      -       -      +
    247C  GLY*     2.8    23.9    +      -       -      -
----------------------------------------------------------
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Residues in contact with PHE 244 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      7C  VAL*     5.2     3.6    -      -       +      -
     19C  LEU*     5.0    17.0    -      -       +      -
     21C  LEU*     5.7     3.4    -      -       +      -
     32C  LEU*     3.4    37.7    -      -       +      -
     36C  MET*     4.6    11.7    -      -       -      -
    232C  VAL*     5.8     3.8    -      -       +      -
    240C  ALA      3.0     7.7    +      -       -      +
    241C  ASN      4.0     4.7    -      -       -      +
    243C  VAL*     1.3    83.5    -      -       +      +
    245C  SER*     1.3    63.2    +      -       -      +
    246C  ARG      3.1     0.2    +      -       -      -
    247C  GLY*     3.2     2.1    +      -       -      +
    248C  ILE*     3.0    55.1    +      -       +      +
    101K  LEU*     4.0    21.5    -      -       +      -
    105K  PHE*     3.2    56.8    -      +       +      -
----------------------------------------------------------
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Residues in contact with SER 245 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    241C  ASN*     2.8    20.6    +      -       -      +
    242C  GLN*     3.9     7.0    -      -       -      -
    244C  PHE*     1.3    77.8    -      -       -      +
    246C  ARG*     1.3    59.3    +      -       -      +
    248C  ILE*     3.4     7.9    +      -       -      +
    249C  LYS*     2.9    26.0    +      -       -      +
    102K  ASP*     4.4    18.1    +      -       -      +
    105K  PHE*     4.6     8.5    -      -       -      -
    106K  ASN*     3.9    17.1    +      -       -      -
----------------------------------------------------------
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Residues in contact with ARG 246 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     40C  VAL*     4.4    17.0    -      -       +      -
     41C  PRO      4.7     1.2    +      -       -      -
     73C  SER      3.9     3.4    +      -       -      -
     74C  GLU      2.8    27.8    +      -       -      -
     75C  ASP*     4.6     0.8    -      -       -      +
     76C  VAL*     3.7    20.8    -      -       -      +
     77C  GLU*     2.6    54.9    +      -       -      +
    238C  LEU*     4.1    16.6    -      -       -      +
    242C  GLN*     2.8    41.7    +      -       +      +
    243C  VAL      3.7     2.0    -      -       -      +
    245C  SER*     1.3    78.4    -      -       -      +
    247C  GLY*     1.3    64.9    +      -       -      +
    248C  ILE      3.1     1.1    -      -       -      -
    249C  LYS*     3.7     7.3    -      -       +      +
    250C  THR*     2.7    33.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLY 247 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     32C  LEU*     4.8    10.1    -      -       -      -
     35C  THR*     3.5    26.1    -      -       -      +
     36C  MET*     5.0     4.5    -      -       -      -
     40C  VAL*     4.1     7.0    -      -       -      +
    243C  VAL      2.8    15.6    +      -       -      -
    244C  PHE      3.2     2.9    +      -       -      -
    246C  ARG*     1.3    75.8    -      -       -      +
    248C  ILE*     1.3    62.8    +      -       -      +
    250C  THR*     3.3     2.4    +      -       -      -
    251C  LEU*     3.0    25.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 248 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     32C  LEU*     4.6     7.0    -      -       +      -
    244C  PHE*     3.0    55.5    +      -       +      +
    245C  SER*     3.5     8.1    -      -       -      +
    247C  GLY*     1.3    77.2    -      -       -      +
    249C  LYS*     1.3    64.0    +      -       -      +
    251C  LEU*     3.2     5.1    +      -       -      +
    252C  GLN*     2.9    30.3    +      -       -      +
     98K  LEU*     3.7    38.5    -      -       +      +
    101K  LEU*     4.5     3.6    -      -       +      -
    102K  ASP*     3.8    32.8    -      -       +      +
----------------------------------------------------------
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Residues in contact with LYS 249 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     77C  GLU*     6.0     3.4    -      -       -      +
    245C  SER      2.9    16.8    +      -       -      +
    246C  ARG*     3.2     9.8    +      -       +      +
    248C  ILE*     1.3    77.9    -      -       -      +
    250C  THR*     1.3    64.6    +      -       -      +
    252C  GLN*     3.2    22.1    +      -       -      +
    253C  GLU*     2.9    60.1    +      -       +      +
----------------------------------------------------------
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Residues in contact with THR 250 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     35C  THR*     4.6     4.9    -      -       +      -
     39C  GLU*     3.5    41.9    +      -       +      +
     40C  VAL*     4.7     1.0    -      -       -      +
     41C  PRO*     4.7     8.6    -      -       +      +
     77C  GLU*     5.0     2.4    +      -       -      -
    246C  ARG*     2.7    24.3    +      -       -      +
    247C  GLY*     3.6     5.9    -      -       -      -
    249C  LYS*     1.3    76.6    -      -       -      +
    251C  LEU*     1.3    59.8    +      -       +      +
    253C  GLU*     3.0    13.3    +      -       +      +
    254C  LYS*     2.8    30.8    +      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 251 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     28C  LEU*     6.1     3.1    -      -       +      -
     31C  SER*     4.3    14.8    -      -       -      -
     32C  LEU*     4.9     8.3    -      -       +      +
     35C  THR*     3.8    23.6    -      -       +      +
     39C  GLU*     5.6     0.2    -      -       -      +
    247C  GLY      3.0    16.6    +      -       -      +
    248C  ILE*     3.9     4.7    -      -       -      +
    250C  THR*     1.3    73.9    -      -       +      +
    252C  GLN*     1.3    67.1    +      -       -      +
    254C  LYS*     3.2    26.6    +      -       +      +
    255C  LEU*     3.0    30.3    +      -       +      +
     41K  THR*     4.7    11.2    -      -       +      +
     42K  LEU*     5.6     2.5    -      -       +      -
     45K  LEU*     4.2    24.0    -      -       +      -
     98K  LEU*     4.4    20.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLN 252 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    248C  ILE*     2.9    23.2    +      -       -      +
    249C  LYS*     3.4    28.4    +      -       +      +
    251C  LEU*     1.3    78.0    -      -       -      +
    253C  GLU*     1.3    59.6    +      -       +      +
    255C  LEU*     3.4     4.1    +      -       -      +
    256C  ALA*     2.8    30.8    +      -       -      +
     95K  ILE*     4.0    23.8    +      -       +      +
     98K  LEU*     3.8    17.3    +      -       +      +
     99K  LYS*     3.2    43.6    -      -       -      +
    102K  ASP*     5.3     1.6    -      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 253 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    249C  LYS*     2.9    54.4    +      -       -      +
    250C  THR*     3.0    13.8    +      -       +      +
    252C  GLN*     1.3    76.4    -      -       +      +
    254C  LYS*     1.3    57.4    +      -       -      +
    256C  ALA*     3.3     7.7    +      -       -      +
    257C  ASN*     2.9    28.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 254 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     39C  GLU*     2.9    39.0    +      -       -      -
    165C  LYS*     6.1     0.2    -      -       -      +
    250C  THR*     2.8    18.1    +      -       +      +
    251C  LEU*     3.2    23.8    +      -       +      +
    253C  GLU*     1.3    77.6    -      -       -      +
    255C  LEU*     1.3    63.2    +      -       -      +
    257C  ASN*     3.0    12.2    +      -       +      +
    258C  VAL*     3.0    23.5    +      -       +      +
     18K  LYS*     5.9     1.1    -      -       -      +
     37K  ARG      5.7     0.6    +      -       -      -
     38K  GLU*     3.6    34.9    +      -       -      +
     41K  THR*     5.2     4.7    -      -       +      -
     42K  LEU*     4.4    22.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 255 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    251C  LEU*     3.0    22.8    +      -       +      +
    252C  GLN*     4.0     2.7    -      -       -      +
    254C  LYS*     1.3    75.8    -      -       -      +
    256C  ALA*     1.3    58.3    +      -       -      +
    258C  VAL*     3.2     7.9    +      -       +      +
    259C  LEU*     2.9    28.9    +      -       -      +
     42K  LEU*     4.2    25.8    -      -       +      -
     45K  LEU*     4.6     9.2    -      -       +      -
     46K  LEU*     4.4    15.9    -      -       +      -
     91K  CYS*     4.2    25.1    -      -       +      -
     94K  ILE*     3.8    36.8    -      -       +      -
     95K  ILE*     4.3    18.1    -      -       +      +
     98K  LEU*     5.4     2.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 256 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    252C  GLN      2.8    19.8    +      -       -      +
    253C  GLU*     3.5     9.2    -      -       -      +
    254C  LYS      3.1     0.2    -      -       -      -
    255C  LEU*     1.3    77.0    -      -       -      +
    257C  ASN*     1.3    61.6    +      -       -      +
    259C  LEU*     3.3     8.0    +      -       -      +
    260C  PHE*     2.9    24.9    +      -       -      +
     95K  ILE*     4.6    10.5    -      -       +      +
----------------------------------------------------------
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Residues in contact with ASN 257 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    253C  GLU      2.9    13.2    +      -       -      +
    254C  LYS*     3.2    13.8    -      -       +      +
    256C  ALA*     1.3    76.5    -      -       -      +
    258C  VAL*     1.3    57.0    +      -       +      +
    260C  PHE*     3.3    10.6    +      -       -      +
    261C  GLU*     2.9    45.0    +      -       -      +
     18K  LYS*     4.4    22.7    -      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 258 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    254C  LYS*     3.0    20.3    +      -       +      +
    255C  LEU*     3.2    11.4    +      -       +      +
    257C  ASN*     1.3    75.7    -      -       +      +
    259C  LEU*     1.3    67.9    +      -       -      +
    261C  GLU*     2.9    17.0    +      -       -      +
    262C  LEU*     3.0    25.6    +      -       +      +
     18K  LYS*     5.1    13.0    -      -       +      -
     19K  LEU*     4.1    19.5    -      -       +      -
     35K  PHE*     4.5    11.0    -      -       +      -
     42K  LEU*     4.0    26.0    -      -       +      -
     46K  LEU*     4.8     9.9    -      -       +      -
     87K  LEU*     5.8     1.3    -      -       +      -
     91K  CYS*     4.8     8.5    -      -       -      -
----------------------------------------------------------
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Residues in contact with LEU 259 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    255C  LEU      2.9    16.0    +      -       -      +
    256C  ALA*     3.7     6.3    -      -       -      +
    258C  VAL*     1.3    77.3    -      -       -      +
    260C  PHE*     1.3    63.5    +      -       -      +
    262C  LEU*     3.3     6.9    +      -       +      +
    263C  GLU*     3.0    46.8    +      -       -      +
     88K  GLU*     3.7    42.4    -      -       +      +
     91K  CYS*     4.1    20.4    -      -       +      -
     92K  ALA*     5.5     4.3    -      -       +      +
     95K  ILE*     5.1    11.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with PHE 260 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    256C  ALA      2.9    17.2    +      -       -      +
    257C  ASN*     3.4    10.1    -      -       -      +
    259C  LEU*     1.3    78.6    -      -       -      +
    261C  GLU*     1.3    75.4    +      -       -      +
    263C  GLU*     3.4    16.0    +      -       +      +
    264C  ASN*     2.8    45.8    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLU 261 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    257C  ASN*     2.9    34.4    +      -       -      +
    258C  VAL*     2.9     9.3    +      -       -      +
    260C  PHE*     1.3    87.8    -      -       -      +
    262C  LEU*     1.3    66.4    +      -       -      +
    264C  ASN*     2.9    27.5    +      -       -      +
    265C  SER*     3.0    14.4    +      -       -      -
     12K  LEU*     5.9     0.2    -      -       -      +
     17K  PRO*     5.2     3.3    -      -       -      +
     18K  LYS*     3.4    40.0    +      -       +      +
     19K  LEU*     4.4    21.4    +      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 262 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    258C  VAL*     3.0    29.2    +      -       +      +
    259C  LEU*     3.6    11.9    -      -       -      +
    261C  GLU*     1.3    77.1    -      -       -      +
    263C  GLU*     1.3    62.6    +      -       -      +
    264C  ASN      3.1     0.5    +      -       -      -
    265C  SER*     3.2     7.8    +      -       -      -
    266C  ARG*     3.0    19.1    +      -       -      +
     19K  LEU*     3.8    25.6    -      -       +      -
     21K  ILE*     4.4    13.6    -      -       +      +
     33K  ILE*     5.5     1.8    -      -       +      -
     84K  LYS*     5.1    15.5    -      -       +      +
     87K  LEU*     3.6    41.5    -      -       +      -
     88K  GLU*     4.8    18.6    -      -       +      +
     91K  CYS*     4.7     5.4    -      -       -      -
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Residues in contact with GLU 263 (chain C). Click here for Legend to table.
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                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    259C  LEU*     3.0    42.8    +      -       +      +
    260C  PHE*     3.7    16.6    -      -       +      +
    262C  LEU*     1.3    75.9    -      -       -      +
    264C  ASN*     1.3    52.4    +      -       -      +
    266C  ARG*     2.7    72.3    +      -       -      +
     88K  GLU*     4.0     8.5    -      -       -      +
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Residues in contact with ASN 264 (chain C). Click here for Legend to table.
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                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    260C  PHE*     2.8    36.0    +      -       +      +
    261C  GLU*     2.9    26.5    +      -       -      +
    263C  GLU*     1.3    73.2    -      -       -      +
    265C  SER*     1.3    60.7    +      -       -      +
    266C  ARG      2.7    16.8    -      -       -      +
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Residues in contact with SER 265 (chain C). Click here for Legend to table.
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                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    261C  GLU      3.0    10.6    +      -       -      -
    262C  LEU      3.6     8.5    -      -       -      -
    264C  ASN*     1.3    75.4    -      -       -      +
    266C  ARG*     1.3    60.1    +      -       -      +
     19K  LEU      5.9     1.8    -      -       -      -
     21K  ILE*     4.1    24.9    -      -       -      +
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Residues in contact with ARG 266 (chain C). Click here for Legend to table.
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                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    262C  LEU      3.0    12.7    +      -       -      +
    263C  GLU*     2.7    56.1    +      -       -      +
    264C  ASN      2.7    18.0    -      -       -      +
    265C  SER*     1.3    78.0    -      -       -      +
     84K  LYS*     3.4    36.5    -      -       -      +
     88K  GLU*     2.9    31.4    +      -       -      -
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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