Contacts of the helix formed by residues 249 - 273 (chain G) in PDB entry 3FKS


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 ASN 249 (chain G).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     14G  LYS*     5.5     4.0    -      -       -      +
    245G  GLY*     3.3    16.0    +      -       -      +
    247G  MET      3.1     0.2    -      -       -      -
    248G  ILE*     1.3    96.8    +      -       -      +
    250G  ARG*     1.3    63.7    +      -       -      +
    251G  TYR      3.5     0.2    -      -       -      -
    252G  SER*     3.4     9.0    +      -       -      -
    253G  ILE*     3.2    27.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 250 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    245G  GLY      4.3     0.4    +      -       -      -
    246G  ASP*     3.0    54.0    +      -       -      +
    247G  MET*     3.3     7.7    +      -       -      +
    249G  ASN*     1.3    81.3    -      -       -      +
    251G  TYR*     1.3    77.9    +      -       +      +
    253G  ILE*     3.4    13.4    +      -       -      +
    254G  LEU*     3.5    10.4    +      -       +      +
----------------------------------------------------------
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Residues in contact with TYR 251 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    386F  ASP*     4.5     6.2    +      -       -      -
      6G  VAL*     4.9    12.1    -      -       +      +
      9G  ARG*     3.0    51.8    +      -       +      -
     10G  LEU*     3.8    18.4    -      -       +      +
     13G  ILE*     6.1     1.3    -      -       +      -
    247G  MET*     2.9    44.3    +      -       +      +
    250G  ARG*     1.3    92.5    -      -       +      +
    252G  SER*     1.3    58.8    +      -       -      +
    253G  ILE      3.3     0.2    -      -       -      -
    254G  LEU*     3.2    27.4    +      -       +      +
    255G  TYR*     2.8    28.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with SER 252 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     10G  LEU*     3.5    15.4    -      -       -      +
    248G  ILE      2.8    24.8    +      -       -      -
    249G  ASN*     3.4    16.8    +      -       -      -
    250G  ARG      3.1     0.2    -      -       -      -
    251G  TYR*     1.3    78.3    -      -       -      +
    253G  ILE*     1.3    65.7    +      -       -      +
    255G  TYR*     3.2    13.5    +      -       -      +
    256G  ASN*     3.3    21.5    +      -       -      -
----------------------------------------------------------
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Residues in contact with ILE 253 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    332B  GLN      4.8    10.1    -      -       -      +
    333B  GLY*     4.4    26.0    -      -       -      +
    335B  ASP*     5.0     9.4    -      -       +      -
    318E  THR*     5.1    13.2    -      -       +      +
    249G  ASN      3.2    17.2    +      -       -      +
    250G  ARG*     3.7     8.1    -      -       -      +
    251G  TYR      3.3     0.4    -      -       -      -
    252G  SER*     1.3    79.7    -      -       -      +
    254G  LEU*     1.3    56.6    +      -       -      +
    256G  ASN*     3.3    12.2    +      -       +      +
    257G  ARG*     2.9    28.9    +      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 254 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      1G  ALA      5.0     4.3    -      -       -      +
      6G  VAL*     3.7    28.3    -      -       +      -
    250G  ARG*     3.5     6.5    +      -       +      +
    251G  TYR*     3.2    37.8    +      -       +      +
    253G  ILE*     1.3    76.6    -      -       -      +
    255G  TYR*     1.3    63.0    +      -       -      +
    257G  ARG*     3.7    16.9    +      -       -      +
    258G  THR*     2.8    34.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with TYR 255 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    335A  ASP*     5.6     1.7    +      -       -      -
    337A  SER*     5.9     3.3    -      -       -      -
    314E  ALA*     6.3     1.1    -      -       +      -
      3G  LEU      5.0     5.8    -      -       -      -
      6G  VAL*     4.4    16.1    -      -       +      +
      7G  GLU*     3.8    52.1    +      -       +      -
     10G  LEU*     4.1    15.5    -      -       +      -
    251G  TYR      2.8    12.3    +      -       -      +
    252G  SER      3.2     9.6    +      -       -      +
    254G  LEU*     1.3    78.0    -      -       -      +
    256G  ASN*     1.3    75.2    +      -       -      +
    258G  THR*     3.1     8.8    +      -       -      -
    259G  ARG*     2.8    49.7    +      -       +      +
----------------------------------------------------------
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Residues in contact with ASN 256 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    314E  ALA*     4.8     4.0    +      -       -      +
    315E  ASP      4.7     4.0    +      -       -      -
    316E  ASP*     3.2    50.0    +      -       -      +
    318E  THR*     4.1     6.7    -      -       -      +
    252G  SER*     3.3    19.9    +      -       -      -
    253G  ILE*     3.3    14.5    +      -       +      +
    255G  TYR*     1.3    90.5    -      -       -      +
    257G  ARG*     1.3    56.7    +      -       -      +
    258G  THR      2.9     5.2    -      -       -      -
    259G  ARG*     3.8    13.7    +      -       -      +
    260G  GLN*     2.9    37.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 257 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    293B  ARG*     5.5     1.8    -      -       -      +
    335B  ASP*     3.1    39.1    +      -       -      +
    337B  SER*     2.8    30.6    +      -       -      -
    338B  ALA*     4.7     2.6    -      -       -      +
    318E  THR*     5.4     0.8    +      -       -      -
    314F  ALA*     3.6    19.4    +      -       -      +
    316F  ASP*     5.9     1.2    -      -       -      +
    253G  ILE*     2.9    19.1    +      -       +      +
    254G  LEU*     3.8    19.1    -      -       -      +
    255G  TYR      3.4     0.2    -      -       -      -
    256G  ASN*     1.3    75.1    -      -       -      +
    258G  THR*     1.3    58.9    +      -       -      +
    260G  GLN*     4.5     6.3    -      -       -      +
    261G  ALA*     3.5    20.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with THR 258 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      1G  ALA*     4.1    16.6    +      -       -      +
      2G  THR      4.1    20.6    -      -       -      +
      3G  LEU*     4.8     3.4    -      -       -      +
      6G  VAL*     4.2    11.5    -      -       +      +
    254G  LEU*     2.8    27.8    +      -       -      +
    255G  TYR      3.1     9.3    +      -       -      -
    256G  ASN      2.9     0.6    -      -       -      -
    257G  ARG*     1.3    83.0    +      -       -      +
    259G  ARG*     1.3    58.3    +      -       -      +
    260G  GLN      3.4     0.4    -      -       -      -
    261G  ALA*     3.5     4.3    +      -       -      +
    262G  VAL*     2.9    46.0    +      -       +      +
----------------------------------------------------------
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Residues in contact with ARG 259 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    293A  ARG*     4.3    10.7    -      -       -      +
    337A  SER*     5.4     8.8    +      -       -      -
    279E  VAL*     5.1     1.0    -      -       -      +
    313E  PRO*     4.5     6.0    +      -       -      +
    314E  ALA*     4.6    18.1    -      -       -      +
    316E  ASP*     3.4    24.7    +      -       -      +
    319E  ASP*     3.4    25.3    +      -       -      -
    255G  TYR*     2.8    42.4    +      -       +      +
    256G  ASN*     2.9    16.6    +      -       -      +
    258G  THR*     1.3    76.2    -      -       -      +
    260G  GLN*     1.3    73.4    +      -       -      +
    262G  VAL*     3.2     7.0    +      -       +      +
    263G  ILE*     3.1    59.8    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLN 260 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    279E  VAL*     3.8    24.7    -      -       +      +
    316E  ASP*     3.0    21.8    +      -       -      +
    318E  THR*     3.1    39.7    +      -       -      +
    319E  ASP*     3.2     7.6    -      -       -      +
    320E  PRO*     4.3     6.1    -      -       -      +
    256G  ASN      2.9    18.6    +      -       -      +
    257G  ARG*     4.9     4.7    -      -       -      +
    259G  ARG*     1.3    90.6    -      -       -      +
    261G  ALA*     1.3    62.3    +      -       -      +
    263G  ILE*     3.6     5.8    +      -       -      +
    264G  THR*     3.2    27.7    +      -       -      -
----------------------------------------------------------
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Residues in contact with ALA 261 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    257G  ARG      3.5    18.7    +      -       -      +
    258G  THR*     3.5     7.9    +      -       +      +
    259G  ARG      3.2     0.6    -      -       -      -
    260G  GLN*     1.3    78.2    -      -       -      +
    262G  VAL*     1.3    59.0    +      -       -      +
    264G  THR*     4.1     5.2    -      -       -      -
    265G  ASN*     3.1    42.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 262 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
      3G  LEU*     3.6    36.8    -      -       +      -
    258G  THR*     2.9    34.8    +      -       +      +
    259G  ARG*     3.2    10.3    +      -       +      +
    261G  ALA*     1.3    76.9    -      -       -      +
    263G  ILE*     1.3    63.6    +      -       +      +
    265G  ASN*     4.3     2.1    -      -       -      +
    266G  GLU*     2.9    45.5    +      -       +      +
----------------------------------------------------------
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Residues in contact with ILE 263 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    293A  ARG*     3.3    62.1    -      -       +      +
    294A  GLU*     5.4     3.7    +      -       +      +
    279E  VAL*     3.9    28.7    -      -       +      +
    280E  GLY*     5.4     0.4    -      -       -      -
    259G  ARG*     3.1    44.1    +      -       +      +
    260G  GLN      4.1     3.8    -      -       -      +
    262G  VAL*     1.3    81.5    -      -       +      +
    264G  THR*     1.3    61.2    +      -       -      +
    266G  GLU*     3.9    10.7    -      -       -      +
    267G  LEU*     3.2    23.1    +      -       +      +
----------------------------------------------------------
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Residues in contact with THR 264 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    292B  GLY      5.0     1.6    -      -       -      +
    294B  GLU*     4.9     8.1    -      -       -      +
    295B  ALA*     4.4    26.5    -      -       +      +
    277E  SER      4.9     3.8    -      -       -      +
    278E  ALA*     3.7     3.6    -      -       -      +
    279E  VAL*     2.8    31.2    +      -       -      +
    280E  GLY      5.5     0.7    -      -       -      +
    260G  GLN      3.2    14.3    +      -       -      -
    261G  ALA*     4.3     5.2    -      -       -      -
    263G  ILE*     1.3    76.7    -      -       -      +
    265G  ASN*     1.3    70.1    +      -       -      +
    267G  LEU*     2.9     7.4    +      -       -      +
    268G  VAL*     2.8    38.1    +      -       +      +
----------------------------------------------------------
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Residues in contact with ASN 265 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    292B  GLY      5.4     2.9    -      -       -      +
    293B  ARG*     5.8     2.3    -      -       -      -
    294B  GLU      5.7     2.1    +      -       -      -
    279F  VAL*     5.6    13.4    -      -       -      +
    261G  ALA*     3.1    26.1    +      -       -      +
    262G  VAL*     4.3     2.2    -      -       -      +
    264G  THR*     1.3    84.0    -      -       -      +
    266G  GLU*     1.3    61.1    +      -       -      +
    267G  LEU      3.3     0.3    +      -       -      -
    268G  VAL*     3.5    16.0    +      -       -      +
    269G  ASP*     3.6    19.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 266 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    294A  GLU*     3.7    41.9    +      -       +      +
    278D  ALA*     4.1    16.2    -      -       -      +
    279D  VAL*     4.3    22.2    -      -       -      +
    262G  VAL*     2.9    32.7    +      -       +      +
    263G  ILE*     3.9     8.9    -      -       -      +
    264G  THR      3.2     0.2    -      -       -      -
    265G  ASN*     1.3    78.2    -      -       -      +
    267G  LEU*     1.3    56.3    +      -       -      +
    269G  ASP*     4.4     5.0    +      -       -      +
    270G  ILE*     3.3    23.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 267 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    292A  GLY*     3.0    28.5    -      -       -      +
    293A  ARG*     4.2    16.6    -      -       +      +
    294A  GLU      4.5     3.6    -      -       -      +
    276E  PRO*     3.7    33.9    -      -       +      +
    277E  SER      5.0     2.5    -      -       -      +
    279E  VAL      5.3     0.2    -      -       -      -
    280E  GLY*     3.9    20.9    -      -       -      +
    263G  ILE      3.2    16.9    +      -       -      +
    264G  THR*     2.9     7.4    +      -       -      +
    266G  GLU*     1.3    79.9    -      -       -      +
    268G  VAL*     1.3    63.0    +      -       -      +
    269G  ASP      3.4     0.7    -      -       -      -
    270G  ILE*     3.2    11.8    +      -       +      -
    271G  ILE*     3.1    42.2    +      -       +      +
----------------------------------------------------------
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Residues in contact with VAL 268 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    291B  PRO*     4.5    36.3    -      -       +      +
    292B  GLY      5.0     4.5    -      -       -      +
    276F  PRO*     6.5     0.4    -      -       +      -
    277F  SER      5.6     5.8    -      -       -      +
    279F  VAL*     5.8     4.7    -      -       -      +
    280F  GLY*     5.7     4.5    -      -       -      +
    264G  THR*     2.8    32.7    +      -       +      +
    265G  ASN*     3.5    11.8    +      -       -      +
    267G  LEU*     1.3    74.5    -      -       -      +
    269G  ASP*     1.3    64.2    +      -       -      +
    271G  ILE*     3.2     6.7    +      -       -      +
    272G  THR*     2.7    48.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASP 269 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    291C  PRO*     5.2     1.4    -      -       -      +
    292C  GLY      4.1    15.5    -      -       -      +
    293C  ARG*     3.7     8.4    -      -       -      +
    294C  GLU*     2.7    37.7    +      -       -      +
    295C  ALA*     4.0     9.0    +      -       -      +
    276D  PRO*     4.2     5.6    -      -       -      +
    280D  GLY*     6.3     2.5    -      -       -      +
    277F  SER      5.7     0.7    -      -       -      +
    265G  ASN      3.6    14.6    +      -       -      +
    266G  GLU*     4.6     6.6    -      -       -      +
    267G  LEU      3.4     0.4    -      -       -      -
    268G  VAL*     1.3    83.8    -      -       -      +
    270G  ILE*     1.3    61.9    +      -       +      +
    272G  THR*     4.0     5.5    -      -       -      -
    273G  GLY*     3.1    24.1    +      -       -      -
----------------------------------------------------------
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Residues in contact with ILE 270 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    291A  PRO*     3.5    34.1    -      -       +      -
    294A  GLU*     5.6     0.4    -      -       -      -
    295A  ALA*     4.6    13.5    -      -       +      +
    275D  ILE*     4.3     1.5    -      -       +      +
    276D  PRO*     3.7    28.6    -      -       +      +
    277D  SER      3.2    31.6    -      -       -      +
    278D  ALA*     4.2     4.5    -      -       -      +
    279D  VAL      5.2     0.2    -      -       -      +
    280D  GLY*     5.0     3.4    -      -       -      +
    266G  GLU      3.3    22.7    -      -       -      +
    267G  LEU*     3.4    15.9    -      -       +      +
    268G  VAL      3.1     0.6    -      -       -      -
    269G  ASP*     1.3    79.7    -      -       +      +
    271G  ILE*     1.3    65.1    +      -       -      +
    273G  GLY      3.5     2.3    +      -       -      -
    274G  ALA*     3.2    24.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 271 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    291A  PRO*     4.2    22.9    -      -       +      +
    288B  ARG*     5.7     0.2    -      -       -      +
    291B  PRO*     5.6     6.7    -      -       +      -
    275E  ILE*     3.8    37.9    -      -       +      -
    276E  PRO*     3.8    33.0    -      -       +      -
    267G  LEU*     3.1    27.9    +      -       +      +
    268G  VAL*     3.8     7.0    -      -       -      +
    270G  ILE*     1.3    76.7    -      -       -      +
    272G  THR*     1.3    63.4    +      -       -      +
    274G  ALA*     3.3    14.8    +      -       +      +
    275G  SER*     3.6    11.3    +      -       -      -
----------------------------------------------------------
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Residues in contact with THR 272 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    291B  PRO*     5.6     3.6    -      -       -      +
    291C  PRO*     4.2    15.1    -      -       +      +
    295C  ALA*     6.0     2.5    -      -       +      -
    275F  ILE*     3.8    27.1    -      -       +      +
    276F  PRO*     3.8    30.0    -      -       +      +
    277F  SER      5.6     2.0    +      -       -      +
    268G  VAL*     2.7    38.1    +      -       -      +
    269G  ASP*     4.0     6.1    -      -       -      -
    271G  ILE*     1.3    77.8    -      -       -      +
    273G  GLY*     1.3    57.1    +      -       -      +
    274G  ALA      3.1     0.4    +      -       -      -
    275G  SER*     2.8    24.3    +      -       -      +
    276G  SER      4.4     0.7    +      -       -      -
----------------------------------------------------------
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Residues in contact with GLY 273 (chain G). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    290C  PRO*     5.0     6.8    -      -       -      +
    291C  PRO*     3.6    26.3    -      -       -      +
    274D  ARG      4.4     2.6    -      -       -      +
    275D  ILE*     4.4     2.4    -      -       -      +
    276D  PRO*     3.4    25.9    -      -       -      +
    269G  ASP      3.1    17.6    +      -       -      -
    270G  ILE      3.7     2.7    -      -       -      -
    271G  ILE      3.3     0.2    -      -       -      -
    272G  THR*     1.3    76.6    -      -       -      +
    274G  ALA*     1.3    58.1    +      -       -      +
    275G  SER      3.5     0.4    -      -       -      -
    276G  SER*     4.4     7.7    +      -       -      -
----------------------------------------------------------
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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