Contacts of the helix formed by residues 262 - 288 (chain L) in PDB entry 6PSU


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 VAL 262 (chain L).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    160L  ASP      3.8    14.8    -      -       -      +
    161L  LEU      3.7    17.3    -      -       -      +
    162L  ILE*     3.6     1.5    -      -       -      +
    163L  THR*     3.1    23.3    -      -       -      +
    261L  LEU*     1.3    76.3    -      -       -      +
    263L  PRO*     1.3    74.7    -      -       +      +
    264L  LYS*     4.3    22.0    -      -       +      +
    265L  GLN*     3.2    19.9    +      -       +      +
    266L  PHE      2.9    21.3    +      -       -      -
----------------------------------------------------------
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Residues in contact with PRO 263 (chain L). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    163L  THR*     4.2     4.5    -      -       -      +
    261L  LEU      4.1     3.6    -      -       -      +
    262L  VAL*     1.3    95.2    -      -       +      +
    264L  LYS*     1.3    49.7    +      -       +      +
    266L  PHE*     2.8    16.5    +      -       +      +
    267L  ASP*     2.5    47.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 264 (chain L). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    262L  VAL*     3.3    21.4    -      -       +      +
    263L  PRO*     1.3    76.9    -      -       +      +
    265L  GLN*     1.3    61.7    +      -       +      +
    267L  ASP*     2.6    29.3    -      -       -      +
    268L  TYR*     2.9    17.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLN 265 (chain L). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    143L  TYR*     4.0     7.0    -      -       -      -
    144L  LEU*     5.9     0.9    -      -       -      -
    147L  GLN*     2.9    56.4    +      -       +      +
    161L  LEU*     3.9    23.6    -      -       +      +
    261L  LEU*     3.8    11.3    -      -       +      +
    262L  VAL*     3.2    18.0    +      -       +      +
    264L  LYS*     1.3    81.6    -      -       +      +
    266L  PHE*     1.3    62.2    +      -       -      +
    268L  TYR*     3.7    12.1    +      -       -      +
    269L  LEU*     3.9    16.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with PHE 266 (chain L). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    127L  ILE*     5.6     3.4    -      -       +      -
    130L  VAL*     3.7    31.9    -      -       +      -
    131L  GLN*     5.0    15.7    -      -       +      -
    134L  VAL*     5.0     6.4    -      -       +      +
    256L  PHE*     6.3     3.1    -      +       -      -
    261L  LEU*     3.2    28.4    -      -       +      +
    262L  VAL      2.9     5.4    +      -       -      -
    263L  PRO*     2.8    25.6    +      -       +      +
    265L  GLN*     1.3    78.9    -      -       -      +
    267L  ASP*     1.3    65.6    +      -       +      -
    269L  LEU*     4.1     1.9    +      -       -      +
    270L  VAL*     3.0    43.0    +      -       +      +
----------------------------------------------------------
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Residues in contact with ASP 267 (chain L). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    263L  PRO*     2.5    29.9    +      -       -      +
    264L  LYS*     2.6    32.0    +      -       -      +
    266L  PHE*     1.3    80.1    -      -       +      +
    268L  TYR*     1.3    63.5    +      -       -      +
    270L  VAL*     3.7     8.7    -      -       +      -
    271L  ASN*     2.3    57.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with TYR 268 (chain L). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    143L  TYR*     3.3    52.5    +      +       +      -
    147L  GLN*     5.2     2.5    -      -       -      -
    264L  LYS      2.9    14.5    +      -       -      +
    265L  GLN*     3.9    11.2    -      -       -      +
    266L  PHE      3.3     0.4    -      -       -      -
    267L  ASP*     1.3    82.4    +      -       -      +
    269L  LEU*     1.3    57.5    +      -       +      +
    271L  ASN*     3.3     3.3    -      -       -      +
    272L  SER*     2.4    47.8    +      -       -      -
----------------------------------------------------------
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Residues in contact with LEU 269 (chain L). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    134L  VAL*     4.3    16.8    -      -       +      +
    137L  TYR*     5.2     7.1    -      -       +      -
    139L  GLU      4.6     0.9    -      -       -      +
    140L  ALA*     2.9    43.7    -      -       +      +
    143L  TYR*     3.6    41.5    -      -       +      -
    144L  LEU*     4.1     8.5    -      -       +      +
    265L  GLN*     3.9    13.6    +      -       -      +
    266L  PHE      4.7     0.9    -      -       -      +
    268L  TYR*     1.3    80.6    -      -       +      +
    270L  VAL*     1.3    51.9    +      -       -      +
    272L  SER*     3.2    11.0    -      -       -      +
    273L  MET*     2.2    38.6    +      -       -      +
    276L  MET*     5.5     0.3    -      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 270 (chain L). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    130L  VAL*     4.5     4.5    -      -       +      -
    134L  VAL*     3.9    13.9    -      -       +      -
    266L  PHE*     3.0    46.3    +      -       +      +
    267L  ASP*     3.3     8.5    +      -       +      +
    268L  TYR      3.1     0.6    -      -       -      -
    269L  LEU*     1.3    76.9    -      -       -      +
    271L  ASN*     1.3    61.6    +      -       -      +
    273L  MET*     2.7    26.9    +      -       +      +
    274L  ARG*     2.3    47.5    +      -       +      +
    365L  MET*     5.1     4.7    -      -       -      -
----------------------------------------------------------
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Residues in contact with ASN 271 (chain L). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    267L  ASP*     2.3    47.6    +      -       -      +
    268L  TYR*     3.3     3.4    -      -       -      +
    270L  VAL*     1.3    77.3    -      -       -      +
    272L  SER*     1.3    55.6    +      -       -      +
    274L  ARG*     3.7    16.2    -      -       +      +
    275L  VAL*     2.9    30.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with SER 272 (chain L). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    268L  TYR*     2.4    41.7    +      -       -      -
    269L  LEU*     3.4    17.4    -      -       -      +
    271L  ASN*     1.3    68.9    -      -       -      +
    273L  MET*     1.3    52.3    +      -       -      -
    275L  VAL*     2.8    12.3    +      -       -      +
    276L  MET*     2.5    37.8    +      -       -      +
    279L  ARG*     4.8     7.6    +      -       -      -
----------------------------------------------------------
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Residues in contact with MET 273 (chain L). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    133L  SER      4.7     4.9    -      -       -      +
    134L  VAL*     3.2    45.3    -      -       +      -
    137L  TYR*     5.6     3.8    -      -       +      -
    269L  LEU      2.2    27.5    +      -       -      +
    270L  VAL*     2.7    23.2    +      -       +      +
    272L  SER*     1.3    67.3    -      -       -      +
    274L  ARG*     1.3    69.6    +      -       -      +
    276L  MET*     3.1    33.9    +      -       +      +
    277L  MET*     3.3     7.8    +      -       -      +
    358L  VAL*     6.3     0.4    -      -       +      -
    361L  ILE*     4.9     2.9    -      -       -      -
    362L  ASN*     3.9    15.7    +      -       +      -
    365L  MET*     3.4    43.1    -      -       +      +
----------------------------------------------------------
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Residues in contact with ARG 274 (chain L). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    270L  VAL*     2.3    40.8    +      -       +      +
    271L  ASN*     3.7    21.1    -      -       +      +
    273L  MET*     1.3    94.8    +      -       -      +
    275L  VAL*     1.3    60.8    +      -       +      +
    277L  MET*     3.9    14.8    -      -       -      +
    278L  ASP*     2.8    39.2    +      -       -      +
    281L  ARG*     4.2    14.1    -      -       -      +
    362L  ASN*     3.3    23.2    -      -       -      +
    365L  MET*     4.4    11.0    -      -       -      +
    366L  SER*     4.9    10.3    +      -       -      -
----------------------------------------------------------
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Residues in contact with VAL 275 (chain L). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    271L  ASN      2.9    25.0    +      -       -      +
    272L  SER*     2.8    14.9    +      -       -      +
    274L  ARG*     1.3    76.7    -      -       +      +
    276L  MET*     1.3    63.9    +      -       -      +
    278L  ASP*     3.5     4.8    +      -       -      +
    279L  ARG*     2.9    58.0    +      -       +      +
----------------------------------------------------------
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Residues in contact with MET 276 (chain L). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    137L  TYR*     3.3    56.5    -      -       +      -
    272L  SER      2.5    16.1    +      -       -      +
    273L  MET*     3.1    30.7    +      -       +      +
    275L  VAL*     1.3    74.1    -      -       -      +
    277L  MET*     1.3    62.2    +      -       -      +
    279L  ARG*     3.5    20.3    +      -       -      +
    280L  VAL*     3.2    23.9    +      -       +      +
    347L  ILE*     5.0     4.4    -      -       +      +
    350L  GLU*     5.0     2.7    -      -       +      +
    351L  THR*     4.0    24.2    -      -       +      -
    358L  VAL*     4.2    16.8    -      -       +      -
----------------------------------------------------------
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Residues in contact with MET 277 (chain L). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    273L  MET      3.3     3.8    +      -       -      -
    274L  ARG*     3.9    13.0    -      -       -      +
    275L  VAL      3.4     0.2    -      -       -      -
    276L  MET*     1.3    76.7    -      -       -      +
    278L  ASP*     1.3    58.1    +      -       -      +
    280L  VAL*     3.1    18.8    -      -       +      +
    281L  ARG*     2.6    77.6    +      -       +      +
    355L  ILE*     5.5     0.7    -      -       -      -
    358L  VAL*     4.9     5.8    -      -       -      +
    359L  LYS*     3.3    42.0    -      -       +      -
    362L  ASN*     3.1    41.7    -      -       -      +
----------------------------------------------------------
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Residues in contact with ASP 278 (chain L). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    274L  ARG*     2.8    31.5    +      -       -      +
    275L  VAL*     3.5     6.0    +      -       +      +
    276L  MET      3.4     0.4    -      -       -      -
    277L  MET*     1.3    77.2    -      -       -      +
    279L  ARG*     1.3    56.9    +      -       -      +
    281L  ARG*     3.8    19.9    +      -       -      +
    282L  THR*     2.5    40.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 279 (chain L). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    272L  SER*     4.8     7.7    +      -       -      -
    275L  VAL*     2.9    47.4    +      -       +      +
    276L  MET*     3.7    21.8    -      -       -      +
    277L  MET      3.2     0.2    -      -       -      -
    278L  ASP*     1.3    77.9    -      -       +      +
    280L  VAL*     1.3    58.7    +      -       -      +
    282L  THR*     3.7     2.9    -      -       -      -
    283L  GLN*     2.9    37.7    +      -       -      +
    346L  GLN*     5.9     0.2    -      -       -      +
    347L  ILE*     3.8    11.2    -      -       +      +
    350L  GLU*     2.8    41.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 280 (chain L). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    276L  MET*     3.2    13.9    +      -       +      +
    277L  MET*     3.1    43.5    -      -       +      +
    279L  ARG*     1.3    77.4    -      -       -      +
    281L  ARG*     1.3    62.9    +      -       -      +
    283L  GLN*     2.9    24.6    +      -       -      +
    284L  GLU*     3.3     5.9    +      -       -      +
    344L  LEU*     3.5    19.6    -      -       +      +
    347L  ILE*     3.3    23.6    -      -       +      -
    355L  ILE*     3.3    31.2    -      -       +      -
    358L  VAL*     6.4     0.9    -      -       +      -
    359L  LYS*     5.7     0.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with ARG 281 (chain L). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    274L  ARG*     4.2    11.5    -      -       -      +
    277L  MET*     2.6    62.4    +      -       +      +
    278L  ASP*     3.8    24.0    +      -       -      +
    280L  VAL*     1.3    73.5    -      -       -      +
    282L  THR*     1.3    61.8    +      -       -      +
    284L  GLU*     3.3    11.9    +      -       +      +
    285L  ARG*     3.1    43.9    +      -       +      +
    362L  ASN*     4.9     0.8    -      -       -      +
----------------------------------------------------------
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Residues in contact with THR 282 (chain L). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    278L  ASP*     2.5    27.0    +      -       -      +
    279L  ARG*     3.7     6.3    -      -       -      -
    281L  ARG*     1.3    77.9    -      -       -      +
    283L  GLN*     1.3    61.8    +      -       -      +
    285L  ARG*     3.1    14.6    +      -       +      +
    286L  LEU*     2.9    25.5    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLN 283 (chain L). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    279L  ARG*     2.9    31.5    +      -       -      +
    280L  VAL      2.9     9.5    +      -       -      +
    282L  THR*     1.3    82.7    -      -       -      +
    284L  GLU*     1.3    48.8    -      -       -      +
    286L  LEU*     2.6    16.5    +      -       -      +
    287L  ILE*     2.2    50.2    +      -       +      +
    340L  ALA*     4.0     9.2    -      -       -      +
    343L  LYS*     3.4    33.5    -      -       +      +
    344L  LEU*     4.2     7.6    -      -       +      -
    346L  GLN*     5.7     0.8    +      -       -      -
    347L  ILE*     3.4    22.5    -      -       +      +
----------------------------------------------------------
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Residues in contact with GLU 284 (chain L). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    280L  VAL      3.3     5.5    +      -       -      +
    281L  ARG*     3.3    13.0    +      -       +      +
    283L  GLN*     1.3    78.2    -      -       -      +
    285L  ARG*     1.3    59.8    +      -       +      +
    287L  ILE*     3.3    13.8    -      -       +      +
    288L  MET*     2.2    80.2    +      -       +      +
    289L  LYS      3.0     5.0    +      -       -      -
    302L  PHE*     3.2    18.4    -      -       +      -
    303L  ILE*     5.3     2.1    -      -       -      +
    306L  PHE*     4.4    16.7    -      -       +      -
    344L  LEU*     6.3     0.2    -      -       +      -
    359L  LYS*     5.5     7.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 285 (chain L). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    281L  ARG*     3.1    35.3    +      -       +      +
    282L  THR*     3.1    20.0    -      -       +      +
    283L  GLN      3.1     0.2    -      -       -      -
    284L  GLU*     1.3    78.2    -      -       -      +
    286L  LEU*     1.3    55.7    +      -       -      +
    288L  MET*     5.9     6.2    -      -       -      +
    289L  LYS*     3.0    50.1    +      -       +      +
    290L  LEU*     3.7     7.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 286 (chain L). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    282L  THR*     2.9    11.0    +      -       +      +
    283L  GLN*     2.6    24.0    +      -       -      +
    285L  ARG*     1.3    72.9    -      -       -      +
    287L  ILE*     1.3    58.5    +      -       -      -
    290L  LEU*     3.2    31.3    -      -       +      +
    336L  GLU*     4.1    27.6    -      -       +      +
    337L  VAL*     2.9    24.3    -      -       -      +
    339L  ARG*     5.1     4.9    -      -       +      +
    340L  ALA*     3.5    25.8    -      -       +      +
    343L  LYS*     5.5     3.8    -      -       +      -
----------------------------------------------------------
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Residues in contact with ILE 287 (chain L). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    283L  GLN      2.2    32.9    +      -       -      +
    284L  GLU*     3.3    13.2    -      -       +      +
    286L  LEU*     1.3    72.8    -      -       -      +
    288L  MET*     1.3    64.4    +      -       -      +
    291L  CYS*     3.7    16.6    +      -       -      +
    302L  PHE*     3.3    31.9    -      -       +      -
    306L  PHE*     5.4     1.3    -      -       +      -
    315L  TRP*     3.5    19.3    -      -       +      -
    337L  VAL*     3.3    22.8    -      -       +      +
    340L  ALA*     3.2    24.9    -      -       +      +
    344L  LEU*     3.2    41.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with MET 288 (chain L). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    284L  GLU*     2.2    62.1    +      -       +      +
    285L  ARG*     5.9     6.1    -      -       -      +
    287L  ILE*     1.3    68.1    -      -       -      +
    289L  LYS*     1.3    53.7    +      -       +      +
    290L  LEU      3.1     1.6    -      -       -      -
    291L  CYS      2.6     6.5    +      -       -      +
    292L  VAL*     2.4    58.1    +      -       +      -
    293L  GLU*     3.1     8.2    -      -       -      +
    299L  LYS*     3.4    27.8    -      -       -      +
    302L  PHE*     3.4    29.2    -      -       +      -
    303L  ILE*     4.7     5.4    -      -       -      -
----------------------------------------------------------
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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