Contacts of the helix formed by residues 244 - 268 (chain P) in PDB entry 1E33


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 ARG 244 (chain P).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     35P  ASP*     2.8    31.5    +      -       -      +
     41P  HIS*     3.3    23.2    +      -       +      -
     43P  SER*     3.1    29.8    -      -       -      +
     44P  SER*     3.1    29.9    +      -       -      +
    242P  SER*     3.1     4.1    +      -       -      +
    243P  GLY*     1.3    75.7    -      -       -      +
    245P  GLY*     1.3    65.2    +      -       -      +
    247P  PHE*     3.5    39.6    +      -       -      +
    248P  GLY*     3.6    18.3    +      -       -      -
    251P  LEU*     4.4     1.4    -      -       -      +
    290P  SER      5.0     6.5    +      -       -      +
    292P  GLY      3.8    12.9    +      -       -      -
    293P  GLY*     4.1     2.4    -      -       -      -
    294P  CYS*     4.1     4.9    -      -       -      +
----------------------------------------------------------
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Residues in contact with GLY 245 (chain P). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    240P  GLU*     6.4     0.4    -      -       -      -
    242P  SER*     4.0     3.8    +      -       -      -
    243P  GLY      3.7     1.4    -      -       -      -
    244P  ARG*     1.3    76.4    -      -       -      +
    246P  PRO*     1.3    71.9    -      -       -      +
    248P  GLY      2.8    17.5    +      -       -      -
    249P  ASP*     2.8    22.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with PRO 246 (chain P). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    162P  PHE*     3.7    23.2    -      -       +      -
    232P  GLN*     3.8    10.7    -      -       +      +
    244P  ARG      4.6     0.2    -      -       -      +
    245P  GLY*     1.3    83.4    -      -       -      +
    247P  PHE*     1.4    63.7    +      -       -      +
    249P  ASP*     3.7    10.9    -      -       -      +
    250P  SER*     3.0    24.6    +      -       -      -
    290P  SER      5.9     1.1    -      -       -      +
    291P  ARG*     3.7    46.0    -      -       +      +
----------------------------------------------------------
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Residues in contact with PHE 247 (chain P). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     30P  ASP      4.6     1.6    -      -       -      -
     31P  LEU*     4.4     1.1    -      -       +      -
     35P  ASP*     3.7    15.0    -      -       -      -
    228P  THR*     3.5    39.1    -      -       +      +
    232P  GLN*     3.9    15.6    -      -       -      +
    244P  ARG*     3.5    39.0    +      -       -      +
    245P  GLY      3.1     1.2    +      -       -      -
    246P  PRO*     1.4    81.6    -      -       -      +
    248P  GLY*     1.4    64.2    +      -       -      +
    250P  SER*     3.7     3.3    +      -       -      -
    251P  LEU*     3.1    27.9    +      -       +      +
    290P  SER      3.9    19.2    +      -       -      +
    291P  ARG*     3.3    23.8    -      -       -      +
    292P  GLY*     3.4     8.5    -      -       -      -
    293P  GLY*     3.3    28.9    -      -       -      -
----------------------------------------------------------
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Residues in contact with GLY 248 (chain P). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     44P  SER*     6.0     2.0    -      -       -      -
     45P  THR      5.1     1.7    +      -       -      +
    242P  SER*     3.0    24.8    -      -       -      -
    244P  ARG*     3.6    19.4    +      -       -      -
    245P  GLY      2.8     6.4    +      -       -      -
    247P  PHE*     1.4    85.4    -      -       -      +
    249P  ASP*     1.3    64.3    +      -       -      -
    250P  SER      3.0     1.8    -      -       -      -
    251P  LEU*     3.3     6.0    -      -       -      +
    252P  MET*     2.9    19.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASP 249 (chain P). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    162P  PHE*     3.9    18.0    -      -       +      -
    234P  SER*     4.0     6.3    -      -       -      +
    238P  PHE*     3.3    14.5    -      -       -      +
    239P  ALA*     3.7     1.4    -      -       -      -
    240P  GLU*     2.7    29.8    +      -       -      +
    241P  ARG      3.4     1.7    +      -       -      -
    242P  SER*     2.6    42.9    +      -       -      +
    245P  GLY      2.8    21.1    +      -       -      +
    246P  PRO*     3.7    10.1    -      -       -      +
    248P  GLY*     1.3    75.1    -      -       -      +
    250P  SER*     1.3    66.8    +      -       -      +
    252P  MET*     3.3     3.4    +      -       -      +
    253P  GLU*     2.9    23.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with SER 250 (chain P). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    227P  HIS*     2.8    47.8    +      -       -      +
    228P  THR*     4.0     1.9    -      -       -      +
    232P  GLN*     2.9    32.5    +      -       -      -
    233P  PHE      3.3    23.7    +      -       -      -
    234P  SER*     4.5     1.6    -      -       -      -
    246P  PRO      3.0    10.6    +      -       -      -
    247P  PHE      3.8     1.1    -      -       -      -
    249P  ASP*     1.3    84.6    -      -       -      +
    251P  LEU*     1.3    59.4    +      -       -      +
    253P  GLU      3.6     0.5    +      -       -      -
    254P  LEU      3.4     3.6    +      -       -      -
----------------------------------------------------------
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Residues in contact with LEU 251 (chain P). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     31P  LEU*     3.7    26.5    -      -       +      -
     35P  ASP*     4.0    20.4    -      -       +      +
     36P  LEU*     4.2    10.3    -      -       +      -
     44P  SER*     4.0    12.1    -      -       -      +
     45P  THR      5.0     0.7    -      -       -      +
     46P  THR*     3.6    29.6    -      -       +      -
     49P  LEU*     5.2     2.2    -      -       +      -
    228P  THR*     3.9    13.9    -      -       +      -
    244P  ARG*     4.4     0.7    -      -       -      +
    247P  PHE*     3.1    30.3    +      -       +      +
    248P  GLY*     3.0     8.3    +      -       -      +
    250P  SER*     1.3    75.1    -      -       -      +
    252P  MET*     1.3    54.7    +      -       -      +
    254P  LEU*     3.0    17.3    +      -       +      +
    255P  ASP*     2.9    34.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with MET 252 (chain P). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     45P  THR*     3.7    36.9    +      -       +      +
     47P  PRO*     5.7     1.6    -      -       +      -
    238P  PHE*     3.3    45.1    -      -       +      +
    241P  ARG*     3.4    15.3    -      -       +      +
    242P  SER*     3.0    42.0    -      -       -      +
    248P  GLY      2.9    14.1    +      -       -      +
    249P  ASP*     3.6     1.3    -      -       -      +
    251P  LEU*     1.3    73.0    -      -       -      +
    253P  GLU*     1.3    58.2    +      -       -      +
    255P  ASP*     3.2     4.7    +      -       +      +
    256P  ALA*     2.7    29.9    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLU 253 (chain P). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    194P  LEU      5.4     1.0    -      -       -      +
    195P  PRO      5.5     0.7    -      -       -      +
    198P  GLU*     3.6    34.2    +      -       +      +
    227P  HIS*     3.0    28.4    +      -       -      +
    233P  PHE*     4.2     6.2    -      -       -      -
    234P  SER*     3.6    14.4    -      -       -      -
    235P  GLY*     2.6    30.1    +      -       -      -
    238P  PHE*     3.1    35.7    -      -       +      -
    249P  ASP      2.9    15.5    +      -       -      +
    250P  SER      3.8     0.4    -      -       -      +
    251P  LEU      3.2     0.2    -      -       -      -
    252P  MET*     1.3    76.6    -      -       -      +
    254P  LEU*     1.4    55.6    +      -       -      +
    256P  ALA*     3.0     2.3    +      -       -      +
    257P  ALA*     2.8    27.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 254 (chain P). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     26P  ILE*     4.4    11.7    -      -       +      -
     28P  ALA*     3.6    29.2    -      -       +      -
     31P  LEU*     4.7     0.4    -      -       +      -
     49P  LEU*     5.0     2.5    -      -       +      -
    223P  TYR*     4.0    17.9    -      -       +      +
    225P  SER*     3.9    29.6    -      -       -      +
    227P  HIS*     3.8    18.7    -      -       +      +
    228P  THR*     5.5     0.7    -      -       +      -
    250P  SER      3.4     7.8    +      -       -      +
    251P  LEU*     3.0    26.1    +      -       +      +
    253P  GLU*     1.4    77.3    -      -       -      +
    255P  ASP*     1.3    62.8    +      -       -      +
    257P  ALA*     3.4     4.6    +      -       -      +
    258P  VAL*     3.1    21.1    +      -       +      +
    278P  PHE*     3.8    17.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with ASP 255 (chain P). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     46P  THR*     3.1    27.5    -      -       +      -
     47P  PRO*     3.0    14.0    -      -       -      +
     48P  ASN*     2.9    40.1    +      -       -      +
     49P  LEU*     2.7    45.4    +      -       +      +
    251P  LEU      2.9    14.6    +      -       -      +
    252P  MET*     3.4     8.1    -      -       -      +
    254P  LEU*     1.3    80.4    -      -       -      +
    256P  ALA*     1.3    58.1    +      -       -      +
    258P  VAL*     3.1     5.1    +      -       -      +
    259P  GLY      3.1    16.1    +      -       -      -
----------------------------------------------------------
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Residues in contact with ALA 256 (chain P). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     48P  ASN*     4.0     8.3    -      -       -      +
    198P  GLU*     4.1     3.8    -      -       -      +
    238P  PHE*     3.4    35.9    -      -       +      -
    252P  MET*     2.7    12.8    +      -       +      +
    253P  GLU      3.0     1.3    +      -       -      +
    255P  ASP*     1.3    74.1    +      -       -      +
    257P  ALA*     1.3    65.1    +      -       -      +
    258P  VAL      3.0     1.4    +      -       -      -
    259P  GLY*     3.0     3.1    +      -       -      -
    260P  THR*     3.0    23.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 257 (chain P). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    198P  GLU*     3.2    27.6    +      -       +      +
    202P  MET*     3.5    17.7    -      -       +      +
    223P  TYR*     3.5    28.0    -      -       +      +
    253P  GLU      2.8    15.9    +      -       -      +
    254P  LEU*     3.7     9.9    -      -       -      +
    256P  ALA*     1.3    72.5    -      -       -      +
    258P  VAL*     1.4    59.0    +      -       -      +
    260P  THR*     3.3     2.7    +      -       -      -
    261P  LEU*     3.0    23.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 258 (chain P). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     26P  ILE*     3.9    34.5    -      -       +      -
     48P  ASN*     4.4    10.3    -      -       +      -
     49P  LEU*     4.0    33.2    -      -       +      +
     52P  LEU*     4.7    18.2    -      -       +      -
    223P  TYR*     5.6     0.2    -      -       +      -
    254P  LEU*     3.1    22.6    +      -       +      +
    255P  ASP*     3.1     9.3    +      -       -      +
    257P  ALA*     1.4    72.4    -      -       -      +
    259P  GLY*     1.3    66.8    +      -       -      +
    261P  LEU*     3.4     9.5    +      -       +      +
    262P  MET*     3.0    27.9    +      -       +      +
    276P  VAL*     6.1     1.3    -      -       +      -
    278P  PHE*     4.8     0.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLY 259 (chain P). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     48P  ASN*     3.6    27.6    -      -       -      +
    255P  ASP      3.1     4.8    +      -       -      -
    256P  ALA      3.0     7.0    +      -       -      -
    258P  VAL*     1.3    80.0    -      -       -      +
    260P  THR*     1.3    55.1    +      -       -      +
    262P  MET*     3.1     9.2    +      -       -      +
    263P  THR*     3.0    30.6    +      -       -      -
----------------------------------------------------------
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Residues in contact with THR 260 (chain P). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    198P  GLU*     4.5     2.3    +      -       -      -
    202P  MET*     3.4    38.7    -      -       +      +
    256P  ALA*     3.0    13.5    +      -       -      +
    257P  ALA*     3.4     8.3    -      -       -      -
    259P  GLY*     1.3    70.7    -      -       -      +
    261P  LEU*     1.3    67.7    +      -       +      +
    262P  MET      2.8     0.9    +      -       -      -
    263P  THR*     3.0    15.9    +      -       -      +
    264P  ALA*     3.0    16.8    +      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 261 (chain P). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     24P  VAL*     4.4    10.1    -      -       +      -
     26P  ILE*     3.5    33.0    -      -       +      -
    202P  MET*     3.3    35.2    -      -       +      -
    205P  ALA*     3.9    20.2    -      -       +      -
    209P  MET*     4.8     7.0    -      -       +      -
    221P  LEU*     4.4    10.8    -      -       +      -
    223P  TYR*     3.9    19.3    -      -       +      -
    257P  ALA      3.0    17.7    +      -       -      +
    258P  VAL*     3.4     7.8    +      -       -      +
    260P  THR*     1.3    75.6    -      -       +      +
    262P  MET*     1.3    61.0    +      -       -      +
    264P  ALA*     3.6     8.0    -      -       -      +
    265P  ILE*     2.8    39.8    +      -       +      +
----------------------------------------------------------
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Residues in contact with MET 262 (chain P). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     24P  VAL*     5.8     0.4    -      -       -      -
     26P  ILE*     6.4     0.7    -      -       -      -
     48P  ASN*     6.4     0.7    -      -       +      -
     52P  LEU*     3.9    20.4    -      -       +      -
    258P  VAL*     3.0    24.1    +      -       +      +
    259P  GLY*     3.3     9.4    -      -       -      +
    260P  THR      2.8     0.8    +      -       -      -
    261P  LEU*     1.3    82.4    -      -       -      +
    263P  THR*     1.3    56.0    +      -       -      +
    265P  ILE*     3.2    11.2    +      -       +      +
    266P  GLY*     3.1    20.8    +      -       -      -
    271P  LEU*     4.1    22.6    -      -       +      +
    276P  VAL*     3.8    24.9    -      -       +      -
    317P  PHE*     3.4    38.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with THR 263 (chain P). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    259P  GLY      3.0    12.8    +      -       -      -
    260P  THR*     3.0    10.8    +      -       -      -
    262P  MET*     1.3    70.1    -      -       -      +
    264P  ALA*     1.3    69.7    +      -       -      +
    265P  ILE      3.1     0.4    -      -       -      -
    266P  GLY*     2.7     4.9    +      -       -      -
    267P  ASP*     2.7    43.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 264 (chain P). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    206P  HIS*     4.2    21.5    -      -       +      -
    209P  MET*     3.4    28.1    -      -       +      +
    260P  THR*     3.0    12.7    +      -       +      +
    261P  LEU*     3.6     6.1    -      -       -      +
    263P  THR*     1.3    79.5    -      -       -      +
    265P  ILE*     1.3    62.9    +      -       -      +
    267P  ASP*     3.8    10.4    -      -       -      +
    268P  LEU*     3.3    25.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 265 (chain P). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     24P  VAL*     4.0    17.7    -      -       +      -
    209P  MET*     4.0    23.8    -      -       -      -
    219P  PHE*     5.0     1.1    -      -       +      -
    261P  LEU*     2.8    29.1    +      -       +      +
    262P  MET*     3.2    12.9    +      -       +      +
    263P  THR      2.8     2.2    +      -       -      -
    264P  ALA*     1.3    73.2    -      -       -      +
    266P  GLY*     1.3    66.7    +      -       -      +
    268P  LEU*     3.4     1.1    +      -       -      -
    269P  GLY      3.3     2.1    +      -       -      -
    270P  LEU*     3.0    55.8    +      -       +      +
    271P  LEU*     3.7    14.6    -      -       +      -
    274P  THR*     3.7    32.3    -      -       +      +
    276P  VAL*     4.3     8.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLY 266 (chain P). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    262P  MET      3.1    10.9    +      -       -      -
    263P  THR*     2.7     6.6    +      -       -      -
    265P  ILE*     1.3    74.7    -      -       -      +
    267P  ASP*     1.3    52.9    +      -       -      +
    269P  GLY*     2.5    34.5    +      -       -      -
    270P  LEU      5.1     0.2    -      -       -      -
    271P  LEU*     4.1    18.9    -      -       -      +
----------------------------------------------------------
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Residues in contact with ASP 267 (chain P). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    206P  HIS*     5.8     4.1    +      -       -      +
    263P  THR*     2.7    40.5    +      -       -      +
    264P  ALA*     3.8     8.5    -      -       -      +
    266P  GLY*     1.3    69.7    -      -       -      +
    268P  LEU*     1.3    65.5    +      -       +      +
    269P  GLY      3.0     3.6    +      -       -      -
----------------------------------------------------------
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Residues in contact with LEU 268 (chain P). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    206P  HIS*     4.6    13.9    -      -       +      +
    209P  MET*     4.0    15.9    -      -       +      +
    210P  ALA*     3.7    35.4    -      -       +      +
    213P  GLN*     2.7    46.6    +      -       -      +
    264P  ALA*     3.3    19.3    +      -       +      +
    265P  ILE*     4.1     0.4    -      -       -      +
    266P  GLY      3.0     1.0    +      -       -      -
    267P  ASP*     1.3    76.4    -      -       +      +
    269P  GLY*     1.3    60.1    +      -       -      +
    270P  LEU*     3.2    27.2    +      -       +      +
----------------------------------------------------------
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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