Contacts of the helix formed by residues 263 - 286 (chain M) in PDB entry 1JH0


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 GLU 263 (chain M).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     34H  GLU*     4.9     0.7    -      -       -      +
     37H  ARG*     4.7     8.8    -      -       -      -
     62H  LYS*     3.2    27.5    +      -       -      +
     64H  PHE*     3.6    18.2    -      -       -      -
    194L  VAL*     5.9     2.5    -      -       +      -
    195L  LEU*     4.0    11.4    -      -       +      +
    198L  ALA*     4.3     6.3    -      -       +      +
    199L  ASN*     2.7    31.6    +      -       -      +
    238M  ILE*     3.0    24.3    -      -       +      +
    261M  THR*     3.1     3.9    +      -       -      +
    262M  MET*     1.3    77.5    -      -       -      +
    264M  GLY*     1.3    64.3    +      -       -      +
    266M  HIS*     3.3    19.6    +      -       -      +
    267M  ARG*     3.6    17.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLY 264 (chain M). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     34H  GLU      5.0     3.8    -      -       -      -
     35H  ASN*     3.1    24.9    +      -       -      -
    261M  THR*     2.9    13.6    +      -       -      -
    263M  GLU*     1.3    73.5    -      -       -      +
    265M  ILE*     1.3    56.9    +      -       -      +
    266M  HIS      2.9     2.2    -      -       -      -
    267M  ARG*     2.6    40.7    +      -       -      +
    268M  TRP*     3.1    12.1    +      -       -      -
----------------------------------------------------------
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Residues in contact with ILE 265 (chain M). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     35H  ASN*     3.5     3.8    +      -       -      -
    215M  LEU*     4.2    11.7    -      -       +      -
    219M  HIS*     3.9    15.3    -      -       +      +
    260M  ALA*     4.2     4.5    -      -       +      -
    261M  THR      3.2    16.9    +      -       -      +
    262M  MET      3.5     3.4    -      -       -      +
    264M  GLY*     1.3    72.8    -      -       -      +
    266M  HIS*     1.3    79.4    +      -       +      +
    268M  TRP*     3.3    11.2    -      -       +      +
    269M  ALA*     2.9    25.3    +      -       +      +
    857M  U10      3.4    89.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with HIS 266 (chain M). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    190L  HIS*     2.7    25.3    +      +       -      -
    191L  GLY*     4.0     6.5    -      -       -      +
    194L  VAL*     3.4    27.2    -      -       +      +
    195L  LEU*     3.8    19.4    -      -       +      +
    219M  HIS*     3.5     7.1    +      +       -      -
    234M  GLU*     2.8    22.4    +      -       -      -
    262M  MET      3.1    25.0    +      -       -      -
    263M  GLU      3.5     8.5    +      -       -      +
    264M  GLY      2.8     1.0    +      -       -      -
    265M  ILE*     1.3    79.9    -      -       +      +
    267M  ARG*     1.3    57.5    +      -       -      +
    268M  TRP      3.1     1.3    -      -       -      -
    269M  ALA*     3.5     5.9    -      -       +      +
    270M  ILE*     2.7    36.2    +      -       -      +
    856M   FE      2.3    31.2    -      -       -      -
----------------------------------------------------------
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Residues in contact with ARG 267 (chain M). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     30H  TYR*     3.3    26.3    +      -       +      -
     31H  LEU*     3.4    15.2    -      -       +      +
     34H  GLU*     3.7    37.6    +      -       +      -
     35H  ASN*     5.8     0.2    -      -       -      +
     62H  LYS*     3.8     7.1    -      -       -      +
    195L  LEU*     3.8    25.1    -      -       +      +
    199L  ASN*     3.6    31.7    +      -       -      +
    145M  HIS*     5.4     6.3    +      -       -      -
    263M  GLU*     3.7    15.7    +      -       -      +
    264M  GLY*     2.6    24.6    +      -       -      +
    266M  HIS*     1.3    72.5    -      -       -      +
    268M  TRP*     1.3    55.6    +      -       -      +
    270M  ILE*     2.9    26.9    -      -       +      +
    271M  TRP*     3.2    17.3    -      -       +      +
----------------------------------------------------------
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Residues in contact with TRP 268 (chain M). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     28H  ILE*     5.1    21.1    -      -       +      -
     31H  LEU*     3.4    41.7    -      -       +      -
     32H  GLN*     4.1    20.2    -      -       +      -
     35H  ASN*     2.9    33.2    -      -       -      +
    215M  LEU*     3.9    13.0    -      -       +      -
    258M  PHE*     4.5     8.3    -      +       -      -
    260M  ALA*     4.4     0.9    -      -       +      -
    264M  GLY      3.1    16.0    +      -       -      -
    265M  ILE*     3.3    18.2    -      -       +      +
    267M  ARG*     1.3    75.9    -      -       -      +
    269M  ALA*     1.3    67.3    +      -       -      +
    271M  TRP*     3.1     3.1    +      -       -      +
    272M  MET*     2.9    31.9    +      -       +      +
    857M  U10      3.7    54.4    -      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 269 (chain M). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    187L  LEU*     3.7    41.3    -      -       +      +
    190L  HIS*     5.7     2.2    -      -       +      -
    191L  GLY*     4.6     6.1    -      -       -      +
    215M  LEU*     3.6    14.8    -      -       +      +
    219M  HIS*     5.7     4.7    -      -       +      -
    265M  ILE*     2.9    16.1    +      -       +      +
    266M  HIS*     3.2    14.6    +      -       +      +
    268M  TRP*     1.3    77.8    -      -       -      +
    270M  ILE*     1.3    63.4    +      -       -      +
    271M  TRP      3.3     0.2    +      -       -      -
    273M  ALA*     3.5    16.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 270 (chain M). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    188L  ALA*     2.9    32.4    -      -       -      +
    191L  GLY*     4.4     2.4    -      -       -      -
    192L  ALA*     3.1    33.9    -      -       +      +
    195L  LEU*     4.1    13.7    -      -       +      -
    145M  HIS*     5.4     5.2    -      -       +      -
    149M  ALA*     4.1    13.7    -      -       +      -
    266M  HIS      2.7    18.2    +      -       -      +
    267M  ARG*     2.9    24.0    -      -       -      +
    269M  ALA*     1.3    72.9    -      -       -      +
    271M  TRP*     1.3    78.8    +      -       +      +
    273M  ALA*     4.4     1.6    -      -       -      +
    274M  VAL*     3.2    33.1    +      -       +      +
----------------------------------------------------------
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Residues in contact with TRP 271 (chain M). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     23H  PHE*     4.3    24.2    -      +       -      -
     27H  LEU*     3.8    44.5    -      -       +      +
     30H  TYR*     4.6    12.6    -      +       -      -
     31H  LEU*     4.2    13.0    -      -       +      -
    267M  ARG*     3.2    24.8    -      -       -      +
    268M  TRP      3.1     2.7    +      -       -      +
    270M  ILE*     1.3    89.7    -      -       +      +
    272M  MET*     1.3    69.5    +      -       -      +
    273M  ALA      2.9     3.1    +      -       -      -
    274M  VAL*     2.9    34.3    +      -       +      -
    275M  LEU*     2.9    29.8    +      -       +      +
    278M  LEU*     5.0     3.8    -      -       +      -
----------------------------------------------------------
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Residues in contact with MET 272 (chain M). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    187L  LEU*     4.3     0.7    -      -       +      -
    853L  BCL      5.2     6.3    -      -       +      -
    208M  PHE*     3.4    46.7    -      -       +      +
    211M  GLY*     3.7    29.4    -      -       -      +
    212M  SER*     3.4    25.7    +      -       -      +
    215M  LEU*     3.8    17.7    -      -       +      -
    268M  TRP*     2.9    26.5    +      -       +      +
    269M  ALA      3.9     2.2    -      -       -      +
    271M  TRP*     1.3    74.0    -      -       -      +
    273M  ALA*     1.3    60.1    +      -       -      +
    275M  LEU*     3.8     8.1    +      -       -      +
    857M  U10      3.7    30.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 273 (chain M). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    184L  ALA*     3.7    25.4    -      -       -      +
    187L  LEU*     4.2     4.9    -      -       +      -
    188L  ALA*     3.9    19.7    -      -       +      +
    212M  SER*     3.3    16.8    -      -       -      +
    269M  ALA      3.5     9.9    +      -       -      +
    271M  TRP      2.9     1.0    +      -       -      -
    272M  MET*     1.3    77.0    -      -       -      +
    274M  VAL*     1.3    66.5    +      -       -      +
    275M  LEU      3.1     2.0    -      -       -      -
    276M  VAL*     2.9    18.2    +      -       -      +
    854M  BPH      3.1    15.8    -      -       +      +
----------------------------------------------------------
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Residues in contact with VAL 274 (chain M). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    188L  ALA*     5.2     2.5    -      -       +      -
    148M  TRP      6.1     0.2    -      -       -      +
    149M  ALA*     3.8    38.8    -      -       +      +
    152M  SER*     2.6    33.0    +      -       -      +
    270M  ILE*     3.2    24.5    +      -       +      +
    271M  TRP*     2.9    32.2    +      -       +      +
    273M  ALA*     1.3    74.9    -      -       -      +
    275M  LEU*     1.3    63.9    +      -       -      +
    276M  VAL      3.3     0.5    +      -       -      -
    277M  THR*     3.5     1.7    +      -       -      -
    278M  LEU*     3.2    14.3    +      -       +      +
    854M  BPH      3.9     8.0    -      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 275 (chain M). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     20H  PHE*     4.3     9.2    -      -       +      -
     23H  PHE*     4.1    16.8    -      -       +      -
     24H  LEU*     4.3     8.1    -      -       +      -
     27H  LEU*     3.9    22.2    -      -       +      -
    208M  PHE*     3.5    41.3    -      -       +      -
    271M  TRP*     2.9    32.5    +      -       +      +
    272M  MET*     4.0     1.8    -      -       -      +
    274M  VAL*     1.3    73.5    -      -       -      +
    276M  VAL*     1.3    66.0    +      -       -      +
    278M  LEU*     3.3    32.1    -      -       +      -
    279M  THR*     2.9    26.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 276 (chain M). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    184L  ALA*     5.2     2.9    -      -       +      -
    205M  SER*     2.9    31.7    +      -       -      +
    208M  PHE*     3.3    31.4    -      -       +      +
    209M  LEU*     3.3    29.4    -      -       +      +
    212M  SER*     4.0     6.1    -      -       -      +
    272M  MET      3.8     3.1    -      -       -      +
    273M  ALA*     2.9    18.6    +      -       -      +
    275M  LEU*     1.3    81.4    -      -       -      +
    277M  THR*     1.3    62.1    +      -       +      +
    280M  GLY*     3.1     8.5    +      -       -      -
    852M  BCL      3.7    31.9    -      -       +      +
    854M  BPH      4.7     5.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with THR 277 (chain M). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    152M  SER*     2.8    43.1    +      -       -      +
    153M  ALA*     3.6     5.3    +      -       -      -
    155M  TRP*     3.2    12.5    -      -       -      -
    156M  LEU*     4.0    28.2    -      -       +      +
    273M  ALA      4.1     0.2    +      -       -      -
    274M  VAL      3.5     1.8    +      -       -      -
    276M  VAL*     1.3    83.3    -      -       +      +
    278M  LEU*     1.3    60.5    +      -       -      +
    280M  GLY*     4.3     1.8    -      -       -      +
    281M  GLY*     3.1    20.1    +      -       -      +
    852M  BCL      4.2    11.0    -      -       +      +
    854M  BPH      3.6    32.3    -      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 278 (chain M). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     20H  PHE*     4.6     9.6    -      -       +      -
     23H  PHE*     4.7    11.0    -      -       +      -
    152M  SER*     4.2     8.1    -      -       -      +
    155M  TRP*     3.2    29.3    +      -       +      +
    271M  TRP*     5.0     3.6    -      -       +      -
    274M  VAL*     3.2    25.7    +      -       +      +
    275M  LEU*     3.1    34.2    +      -       +      +
    277M  THR*     1.3    75.7    -      -       -      +
    279M  THR*     1.3    66.9    +      -       -      +
    281M  GLY      3.2     8.7    +      -       -      -
    282M  ILE*     3.4    14.2    +      -       +      +
----------------------------------------------------------
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Residues in contact with THR 279 (chain M). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     20H  PHE*     3.4    40.4    -      -       +      -
    201M  PHE*     3.5    29.5    -      -       +      +
    204M  LEU*     4.4     4.5    -      -       +      -
    205M  SER*     3.3    23.0    -      -       -      -
    208M  PHE*     3.5    13.9    -      -       +      -
    275M  LEU*     2.9    21.9    +      -       +      +
    278M  LEU*     1.3    76.6    -      -       +      +
    280M  GLY*     1.3    73.0    +      -       -      +
    281M  GLY      3.2     0.5    +      -       -      -
    282M  ILE*     3.2     5.6    +      -       -      +
    283M  GLY      3.0    19.6    +      -       -      -
----------------------------------------------------------
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Residues in contact with GLY 280 (chain M). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    156M  LEU*     4.1     0.9    -      -       -      -
    205M  SER*     3.5    11.4    -      -       -      -
    276M  VAL      3.1     9.6    +      -       -      -
    277M  THR*     4.3     1.1    -      -       -      -
    278M  LEU      3.2     0.2    -      -       -      -
    279M  THR*     1.3    85.0    +      -       -      +
    281M  GLY*     1.3    61.8    +      -       -      +
    284M  ILE*     3.2    11.8    +      -       -      +
    852M  BCL      3.1    49.9    -      -       -      +
----------------------------------------------------------
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Residues in contact with GLY 281 (chain M). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    155M  TRP*     3.4    26.0    -      -       -      -
    156M  LEU*     3.9    17.2    -      -       -      +
    159M  VAL*     3.8     6.1    -      -       -      +
    277M  THR      3.1    13.6    +      -       -      -
    278M  LEU      3.2     0.2    +      -       -      -
    279M  THR      3.1     0.6    -      -       -      -
    280M  GLY*     1.3    77.7    -      -       -      +
    282M  ILE*     1.3    61.8    +      -       -      +
    284M  ILE*     3.3     4.9    +      -       -      +
    285M  LEU*     3.0    22.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 282 (chain M). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     16H  ALA*     4.8     5.4    -      -       +      -
     20H  PHE*     6.2     2.9    -      -       +      -
    155M  TRP*     3.5    26.9    -      -       +      +
    201M  PHE*     4.0    23.1    -      -       +      -
    278M  LEU*     3.4    17.9    +      -       +      +
    279M  THR*     3.2     8.9    +      -       -      +
    281M  GLY*     1.3    74.3    -      -       -      +
    283M  GLY*     1.3    57.3    +      -       -      +
    285M  LEU*     2.7    33.5    +      -       +      +
    286M  LEU*     3.0    37.0    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLY 283 (chain M). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    199M  ASN*     3.0    18.4    +      -       -      -
    201M  PHE*     3.5    27.1    -      -       -      +
    279M  THR      3.0     9.3    +      -       -      -
    280M  GLY      4.0     1.8    -      -       -      -
    282M  ILE*     1.3    80.5    -      -       -      +
    284M  ILE*     1.3    59.5    +      -       -      +
    286M  LEU*     3.8     3.5    +      -       -      -
    287M  SER*     3.0    24.6    +      -       -      -
    294M  TRP*     4.2     0.9    -      -       -      -
    852M  BCL      4.6     3.4    -      -       -      -
----------------------------------------------------------
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Residues in contact with ILE 284 (chain M). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    156M  LEU*     4.3     5.2    -      -       +      -
    159M  VAL*     4.1    11.9    -      -       +      -
    160M  LEU*     3.6    23.3    -      -       +      -
    164M  ARG*     3.4    19.8    -      -       -      -
    189M  PHE*     4.0    30.5    -      -       +      -
    196M  LEU*     4.0     8.3    -      -       +      -
    280M  GLY      3.2    18.3    +      -       -      +
    281M  GLY      3.8     3.6    -      -       -      +
    282M  ILE      3.1     1.0    -      -       -      -
    283M  GLY*     1.3    75.7    -      -       -      +
    285M  LEU*     1.3    65.7    +      -       -      +
    287M  SER*     3.3    12.3    +      -       -      -
    852M  BCL      3.0    52.5    -      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 285 (chain M). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    155M  TRP*     4.2    20.4    -      -       +      -
    159M  VAL*     3.8    15.7    -      -       +      +
    163M  ILE*     3.4    33.0    -      -       +      -
    164M  ARG*     4.6     7.4    -      -       -      +
    167M  LEU*     3.8    19.3    -      -       +      -
    281M  GLY      3.0    13.6    +      -       -      +
    282M  ILE*     2.7    21.4    +      -       +      +
    284M  ILE*     1.3    74.5    -      -       -      +
    286M  LEU*     1.3    58.0    +      -       +      +
    287M  SER      3.1     1.8    +      -       -      -
    289M  THR*     2.6    34.4    +      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 286 (chain M). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     12H  LEU*     4.9    15.0    -      -       +      -
     13H  ALA*     4.3    14.1    -      -       +      -
     16H  ALA*     4.2    14.4    -      -       +      -
    201M  PHE*     3.8    20.6    -      -       +      -
    282M  ILE*     3.0    38.5    +      -       +      +
    283M  GLY      3.8     1.3    +      -       -      +
    284M  ILE      3.3     0.2    -      -       -      -
    285M  LEU*     1.3    85.1    -      -       +      +
    287M  SER*     1.3    60.2    +      -       -      +
    289M  THR*     3.7     6.7    -      -       -      +
    290M  VAL*     4.3    22.2    -      -       +      -
    291M  VAL*     3.1    32.6    +      -       +      +
    294M  TRP*     3.7    13.0    -      -       +      -
----------------------------------------------------------
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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