Contacts of the helix formed by residues 219 - 244 (chain C) in PDB entry 4LML


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 SER 219 (chain C).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    220B  TYR*     4.2     5.2    -      -       -      +
    276B  HIS*     4.7     8.4    +      -       -      -
    217C  SER*     3.1    14.1    +      -       -      -
    218C  THR*     1.3    75.8    -      -       -      +
    220C  TYR*     1.3    66.1    +      -       -      +
    221C  GLU*     4.7     4.0    -      -       -      -
    222C  ALA*     3.7    17.7    -      -       -      +
    223C  ASN*     3.0    22.8    +      -       -      +
    279C  LYS*     5.6     0.7    -      -       -      +
----------------------------------------------------------
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Residues in contact with TYR 220 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    213A  THR*     4.6     8.1    +      -       -      +
    214A  ALA*     5.3     1.8    -      -       -      -
    217A  SER*     3.2    37.9    -      -       -      -
    219A  SER*     3.9    10.5    -      -       -      +
    222A  ALA*     3.9    14.4    -      -       +      -
    223A  ASN*     5.0     1.3    -      -       -      -
    226A  LEU*     5.3     3.1    -      -       +      +
    218C  THR      3.6     4.0    +      -       -      -
    219C  SER*     1.3    71.0    -      -       -      +
    221C  GLU*     1.3    59.2    +      -       -      +
    223C  ASN*     2.8    24.2    +      -       +      +
    224C  VAL*     2.9    33.6    +      -       +      +
    272C  VAL*     3.2    37.4    -      -       +      +
    273C  THR*     3.5    24.8    +      -       -      +
    275C  GLN*     5.8     3.4    -      -       -      +
    276C  HIS*     3.4    38.3    +      +       +      +
    279C  LYS*     5.5     1.2    -      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 221 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    219A  SER*     5.9     2.0    -      -       -      +
    221A  GLU*     3.5    25.9    -      -       +      +
    222A  ALA*     3.2    38.0    +      -       +      +
    225A  THR*     3.5    10.4    +      -       -      -
    221B  GLU*     3.4    33.9    -      -       +      +
    219C  SER*     3.5     3.5    -      -       -      -
    220C  TYR*     1.3    77.8    -      -       -      +
    222C  ALA*     1.3    63.7    +      -       -      +
    224C  VAL*     3.0    36.2    -      -       -      +
    225C  THR*     3.1    11.5    +      -       -      -
    221D  GLU*     4.9     0.5    -      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 222 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    220B  TYR*     3.7    28.0    -      -       +      -
    221B  GLU*     3.3    26.8    +      -       +      +
    224B  VAL*     4.5     6.1    -      -       +      -
    219C  SER*     3.7    21.9    +      -       -      +
    220C  TYR      3.3     0.4    -      -       -      -
    221C  GLU*     1.3    78.4    -      -       -      +
    223C  ASN*     1.3    59.6    +      -       -      +
    225C  THR*     3.4     2.1    +      -       -      -
    226C  LEU*     3.0    35.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASN 223 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    220B  TYR*     4.9     1.4    -      -       -      -
    214C  ALA*     3.4    32.6    +      -       +      +
    217C  SER*     3.3    34.5    +      -       -      -
    219C  SER      3.0    16.7    +      -       -      +
    220C  TYR*     2.8    13.4    +      -       -      +
    222C  ALA*     1.3    80.2    -      -       -      +
    224C  VAL*     1.3    61.4    +      -       -      +
    226C  LEU*     4.0     0.6    -      -       -      +
    227C  VAL*     3.4    27.9    +      -       -      +
    272C  VAL*     3.7    30.9    -      -       +      +
    275C  GLN*     4.0    11.3    -      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 224 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    222A  ALA*     4.2     5.6    -      -       +      -
    225A  THR*     3.6    19.3    -      -       +      -
    226A  LEU*     3.5    26.0    -      -       +      -
    220C  TYR*     2.9    47.9    +      -       +      +
    221C  GLU*     3.0    38.3    +      -       -      +
    223C  ASN*     1.3    76.0    -      -       -      +
    225C  THR*     1.3    66.8    +      -       -      +
    227C  VAL*     3.6     1.6    +      -       -      +
    228C  VAL*     3.0    31.5    +      -       -      +
    272C  VAL*     5.6     3.8    -      -       +      -
----------------------------------------------------------
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Residues in contact with THR 225 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    225A  THR*     4.6    11.7    +      -       -      +
    221B  GLU*     3.7    13.3    +      -       -      +
    224B  VAL*     3.9    22.9    -      -       +      +
    225B  THR*     4.6    14.7    +      -       -      +
    228B  VAL*     5.3     4.9    -      -       +      -
    221C  GLU*     3.1    16.3    +      -       -      -
    222C  ALA      3.7     7.4    -      -       -      -
    224C  VAL*     1.3    84.7    -      -       -      +
    226C  LEU*     1.3    64.1    +      -       +      +
    228C  VAL*     5.0     0.9    -      -       -      -
    229C  SER*     3.0    35.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 226 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    220B  TYR*     5.2     3.1    -      -       +      +
    224B  VAL*     3.6    35.4    -      -       +      -
    228B  VAL*     4.5    15.4    -      -       +      +
    210C  ILE*     3.3    37.7    -      -       +      +
    211C  SER*     4.0     9.6    -      -       -      +
    213C  THR*     4.0    16.8    -      -       +      -
    214C  ALA*     4.4    11.0    -      -       +      -
    222C  ALA      3.0    23.2    +      -       -      +
    223C  ASN*     4.0     6.1    -      -       -      +
    224C  VAL      3.2     0.2    -      -       -      -
    225C  THR*     1.3    77.8    -      -       +      +
    227C  VAL*     1.3    65.3    +      -       -      +
    229C  SER*     3.8     1.1    -      -       -      -
    230C  THR*     3.0    28.5    +      -       +      +
----------------------------------------------------------
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Residues in contact with VAL 227 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    211C  SER*     4.2    18.6    -      -       -      +
    212C  TRP*     6.0     0.2    -      -       -      -
    214C  ALA*     5.0     6.5    -      -       +      -
    223C  ASN      3.4    19.1    +      -       -      +
    224C  VAL*     4.5     1.6    -      -       -      +
    226C  LEU*     1.3    75.7    -      -       +      +
    228C  VAL*     1.3    58.8    +      -       +      +
    230C  THR*     2.9    18.3    +      -       -      -
    231C  LEU*     3.0    18.2    +      -       +      +
    265C  TYR*     3.9    24.6    -      -       +      +
    268C  ALA*     4.1    17.7    -      -       +      -
    269C  VAL*     3.9    26.5    -      -       +      -
    272C  VAL*     4.8    14.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with VAL 228 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    210A  ILE*     5.0     8.5    -      -       +      -
    225A  THR*     5.1     5.4    -      -       +      -
    226A  LEU*     4.4    26.9    -      -       +      -
    229A  SER*     3.3    41.3    -      -       -      +
    230A  THR*     5.2     5.2    -      -       +      -
    224C  VAL*     3.0    22.2    +      -       -      +
    225C  THR*     4.2     2.0    -      -       -      +
    227C  VAL*     1.3    79.4    -      -       +      +
    229C  SER*     1.3    63.5    +      -       -      +
    231C  LEU*     3.0    24.9    +      -       +      +
    232C  ALA*     3.0    15.0    +      -       +      +
    269C  VAL*     5.5     3.6    -      -       +      -
----------------------------------------------------------
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Residues in contact with SER 229 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    229A  SER*     5.6     0.9    +      -       -      -
    228B  VAL*     3.5    29.6    -      -       -      +
    229B  SER*     5.5     1.9    +      -       -      -
    225C  THR*     3.0    26.2    +      -       -      +
    226C  LEU      4.2     0.7    -      -       -      -
    228C  VAL*     1.3    81.3    -      -       -      +
    230C  THR*     1.3    60.4    +      -       -      +
    232C  ALA*     3.9     9.6    -      -       -      +
    233C  ALA*     3.9    14.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with THR 230 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    228B  VAL*     5.4     6.1    -      -       +      -
    231B  LEU*     5.9     2.9    -      -       +      -
    207C  ILE*     3.4    27.8    -      -       +      +
    210C  ILE*     4.5    11.4    -      -       +      -
    211C  SER*     3.3    32.8    -      -       -      +
    226C  LEU*     3.0    19.2    +      -       +      +
    227C  VAL      2.9    17.8    +      -       -      -
    229C  SER*     1.3    78.3    -      -       -      +
    231C  LEU*     1.3    63.4    +      -       -      +
    232C  ALA      3.2     1.8    -      -       -      -
    233C  ALA*     3.1     8.9    +      -       -      +
    234C  HIS      3.0    18.4    +      -       -      -
    265C  TYR*     3.3    12.5    +      -       -      -
----------------------------------------------------------
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Residues in contact with LEU 231 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    206A  PHE*     6.2     1.1    -      -       +      -
    207A  ILE*     4.0    24.0    -      -       +      -
    210A  ILE*     4.2    23.6    -      -       +      -
    230A  THR*     6.3     2.0    -      -       +      -
    227C  VAL*     3.0    15.1    +      -       +      +
    228C  VAL*     3.0    14.6    +      -       +      +
    230C  THR*     1.3    73.3    +      -       -      +
    232C  ALA*     1.3    67.1    +      -       -      +
    234C  HIS*     3.2     2.8    +      -       -      +
    235C  ILE*     2.9    35.0    +      -       +      +
    262C  TYR*     4.0    27.1    -      -       +      -
    265C  TYR*     3.3    38.1    -      -       +      -
    269C  VAL*     6.0     1.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 232 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    229A  SER      6.1     0.4    -      -       -      +
    233A  ALA*     5.9     3.4    -      -       +      -
    228C  VAL*     3.0    15.1    +      -       +      +
    229C  SER*     3.9    11.2    -      -       -      +
    231C  LEU*     1.3    75.2    -      -       -      +
    233C  ALA*     1.3    58.3    +      -       -      +
    235C  ILE*     3.0    15.6    +      -       -      +
    236C  ALA*     2.9    25.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 233 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    232B  ALA*     6.0     2.7    -      -       +      -
    235B  ILE*     3.8    27.4    -      -       +      -
    207C  ILE*     3.7    16.2    -      -       +      -
    229C  SER      3.9     8.4    +      -       -      +
    230C  THR*     3.1    10.3    +      -       -      +
    232C  ALA*     1.3    79.0    -      -       -      +
    234C  HIS*     1.3    58.8    +      -       -      +
    236C  ALA*     3.2     9.8    +      -       -      +
    237C  PHE*     3.0    33.4    +      -       +      -
----------------------------------------------------------
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Residues in contact with HIS 234 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    204C  MET*     3.6    29.0    -      -       +      -
    207C  ILE*     3.5     5.8    -      -       +      +
    230C  THR      3.0     6.5    +      -       -      -
    231C  LEU*     3.2     7.1    +      -       +      +
    233C  ALA*     1.3    73.2    -      -       -      +
    235C  ILE*     1.3    61.8    +      -       -      +
    237C  PHE*     3.8     3.0    -      -       -      +
    238C  ASN*     2.9    25.6    +      -       -      +
    258C  ILE*     3.1    43.9    +      -       +      +
    261C  ILE*     3.4    25.7    -      -       +      +
    262C  TYR*     3.4    34.2    -      +       -      -
    265C  TYR*     3.7    30.4    -      +       +      +
----------------------------------------------------------
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Residues in contact with ILE 235 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    207A  ILE*     4.2     8.3    -      -       +      -
    233A  ALA*     3.7    30.5    -      -       +      +
    236A  ALA*     5.6     5.2    -      -       +      -
    237A  PHE*     3.6    34.1    -      -       +      -
    231C  LEU*     2.9    34.5    +      -       +      +
    232C  ALA*     3.3     9.0    -      -       -      +
    234C  HIS*     1.3    75.5    -      -       -      +
    236C  ALA*     1.3    58.3    +      -       -      +
    238C  ASN*     3.3     0.9    +      -       -      +
    239C  ILE*     2.9    42.8    +      -       +      +
    262C  TYR*     3.2    26.2    -      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 236 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    235B  ILE*     5.7     2.9    -      -       +      -
    239B  ILE*     4.8    16.7    -      -       +      +
    232C  ALA      2.9    12.0    +      -       -      +
    233C  ALA*     3.3    14.4    -      -       -      +
    234C  HIS      3.2     0.2    -      -       -      -
    235C  ILE*     1.3    78.0    -      -       -      +
    237C  PHE*     1.3    57.1    +      -       +      +
    239C  ILE*     3.3     5.9    +      -       -      +
    240C  LEU*     2.9    30.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with PHE 237 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    235B  ILE*     3.7    40.4    -      -       +      -
    238B  ASN*     4.8     4.7    -      -       -      -
    239B  ILE*     5.4     6.3    -      -       +      +
    262B  TYR*     4.0     2.5    -      -       -      -
    199C  ASN      3.3    21.1    -      -       -      -
    200C  ILE*     3.4    36.6    -      -       +      -
    203C  PRO*     3.7    24.7    -      -       +      -
    204C  MET*     4.5    24.9    -      -       +      -
    207C  ILE*     4.4    11.9    -      -       +      -
    233C  ALA      3.0    28.7    +      -       -      +
    234C  HIS      3.8     4.7    -      -       -      +
    236C  ALA*     1.3    73.0    -      -       +      +
    238C  ASN*     1.3    66.4    +      -       -      +
    240C  LEU*     3.3     6.3    +      -       +      +
    241C  VAL*     3.0    30.9    +      -       -      +
    258C  ILE*     4.6     0.9    -      -       -      -
----------------------------------------------------------
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Residues in contact with ASN 238 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    198A  PRO      4.3     2.1    -      -       -      +
    199A  ASN*     3.7    28.8    +      -       -      +
    237A  PHE*     5.0     1.2    -      -       -      -
    234C  HIS      2.9    22.3    +      -       -      +
    235C  ILE      3.4     3.6    -      -       -      +
    237C  PHE*     1.3    72.4    -      -       -      +
    239C  ILE*     1.3    64.2    +      -       -      +
    241C  VAL*     3.4     1.9    +      -       -      +
    242C  GLU*     2.9    48.3    +      -       -      +
    258C  ILE*     3.3    41.8    -      -       +      +
    262C  TYR*     3.6    28.1    +      -       +      +
----------------------------------------------------------
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Residues in contact with ILE 239 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    236A  ALA*     5.3    11.0    -      -       +      +
    237A  PHE*     4.6     7.6    -      -       +      -
    240A  LEU*     3.7    43.3    -      -       +      -
    235C  ILE*     2.9    36.7    +      -       +      +
    236C  ALA*     3.8     5.6    -      -       -      +
    238C  ASN*     1.3    78.9    -      -       -      +
    240C  LEU*     1.3    62.8    +      -       -      +
    242C  GLU*     3.2    13.2    +      -       -      +
    243C  THR*     2.9    44.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 240 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    239B  ILE*     4.2    31.2    -      -       +      -
    242B  GLU*     3.7    29.4    -      -       -      +
    243B  THR*     5.2     6.1    -      -       -      +
    200C  ILE*     3.8    19.1    -      -       +      -
    236C  ALA      2.9    18.3    +      -       -      +
    237C  PHE*     3.7     6.5    -      -       +      +
    239C  ILE*     1.3    79.8    -      -       -      +
    241C  VAL*     1.3    62.8    +      -       +      +
    243C  THR*     3.4    17.1    +      -       +      +
    244C  ASN*     3.7    17.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 241 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    118C  TYR*     3.8    34.4    +      -       +      +
    196C  TYR*     5.9     3.6    -      -       +      -
    200C  ILE*     3.9    34.8    -      -       +      -
    237C  PHE      3.0    21.8    +      -       -      +
    238C  ASN      4.0     2.5    -      -       -      +
    240C  LEU*     1.3    73.8    -      -       +      +
    242C  GLU*     1.3    64.1    +      -       -      +
    243C  THR      3.0     5.5    +      -       -      -
    244C  ASN*     3.3    13.4    +      -       -      +
    245C  LEU*     3.6    15.2    +      -       +      +
    254C  THR*     4.7    14.1    -      -       +      -
    258C  ILE*     5.0    10.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLU 242 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    199A  ASN*     3.8    31.5    -      -       -      +
    200A  ILE*     3.4    24.9    -      -       -      +
    240A  LEU*     4.3    10.0    -      -       -      +
    238C  ASN*     2.9    35.1    +      -       -      +
    239C  ILE*     3.2    17.5    +      -       -      +
    241C  VAL*     1.3    75.7    -      -       -      +
    243C  THR*     1.3    59.4    +      -       -      +
    244C  ASN      3.5     0.2    -      -       -      -
    245C  LEU*     3.1    23.6    -      -       -      +
    247C  LYS*     3.2    29.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with THR 243 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    240A  LEU*     5.0     7.1    -      -       -      +
     32C  LYS*     3.7    23.1    +      -       -      +
    239C  ILE*     2.9    29.3    +      -       -      +
    240C  LEU*     3.5    11.2    -      -       +      +
    241C  VAL      3.0     0.6    -      -       -      -
    242C  GLU*     1.3    77.6    -      -       -      +
    244C  ASN*     1.3    72.7    +      -       -      +
    245C  LEU      3.1     8.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASN 244 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     31C  ASP*     3.8    10.9    -      -       -      +
     32C  LYS*     3.7    14.9    -      -       -      +
    118C  TYR*     5.4     5.2    -      -       -      +
    240C  LEU*     3.7    14.4    +      -       -      +
    241C  VAL*     3.3     7.9    +      -       -      +
    243C  THR*     1.3    91.0    -      -       -      +
    245C  LEU*     1.3    70.1    +      -       +      +
----------------------------------------------------------
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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