Contacts of the helix formed by residues 241 - 264 (chain D) in PDB entry 6UWZ


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 241 (chain D).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    246C  GLY*     2.6    40.2    -      -       -      +
    247C  GLU      3.5     0.7    -      -       -      -
    248C  LYS*     2.8     6.4    +      -       -      +
    249C  MET*     2.7    42.8    +      -       +      +
    250C  SER*     3.7     3.3    +      -       -      +
    302C  LEU*     3.7    21.0    -      -       -      +
    235D  LEU*     3.7     3.7    -      -       +      +
    239D  SER*     2.8    25.8    +      -       -      +
    240D  GLY*     1.3    77.9    -      -       -      +
    242D  LYS*     1.3    65.2    +      -       -      +
    243D  MET      3.4     2.2    -      -       -      -
    244D  THR*     3.3     9.6    -      -       +      +
    245D  LEU*     3.0    24.4    +      -       -      +
    250E  GLN*     3.1     6.5    -      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 242 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    232D  VAL*     3.4    23.1    +      -       +      +
    233D  PHE*     6.0     0.4    -      -       -      -
    235D  LEU*     2.8    41.3    +      -       +      +
    236D  PRO      3.9     9.2    -      -       -      +
    237D  THR*     3.7    25.6    +      -       +      +
    239D  SER      4.1     3.8    -      -       -      +
    241D  GLU*     1.3    77.3    -      -       -      +
    243D  MET*     1.3    63.8    +      -       -      +
    245D  LEU      3.3     0.7    +      -       -      -
    246D  SER*     2.9    31.9    +      -       -      -
    292D  THR*     3.7    26.9    -      -       +      +
    295D  VAL*     4.1     3.9    -      -       -      +
    296D  ILE*     4.1    17.0    -      -       +      -
    407D  ASP*     3.0    30.6    +      -       -      -
    250E  GLN*     3.7     1.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with MET 243 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    242D  LYS*     1.3    74.6    -      -       -      +
    244D  THR*     1.3    66.8    +      -       -      +
    246D  SER*     3.6    12.3    -      -       -      +
    247D  ILE*     2.9    31.8    +      -       +      +
    289D  ILE*     4.0    14.8    -      -       +      -
    292D  THR*     3.8     9.2    -      -       +      -
    293D  VAL*     3.9    23.6    -      -       +      -
    296D  ILE*     3.2    30.5    -      -       +      -
    243E  LEU*     4.4     5.6    -      -       +      -
    249E  GLY      4.0     7.6    -      -       -      +
    250E  GLN*     2.8    44.4    +      -       +      +
    253E  THR*     4.7     5.4    -      -       +      -
    254E  LEU*     4.6    15.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with THR 244 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    249C  MET*     4.2     5.4    -      -       +      -
    250C  SER*     3.7    40.9    +      -       -      +
    253C  ILE*     4.5     1.6    -      -       +      -
    241D  GLU*     3.3    15.5    -      -       +      +
    243D  MET*     1.3    76.2    -      -       -      +
    245D  LEU*     1.3    58.1    +      -       -      +
    247D  ILE*     3.6     5.1    -      -       -      +
    248D  SER*     2.8    43.2    +      -       -      +
    250E  GLN*     3.0    21.4    +      -       -      -
    253E  THR*     4.2    12.6    -      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 245 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    249C  MET*     3.9    24.9    -      -       +      -
    253C  ILE*     3.6    28.0    -      -       +      -
    295C  VAL*     4.1    12.6    -      -       +      -
    299C  VAL*     4.2    11.2    -      -       +      -
    228D  LEU*     4.7     8.3    -      -       +      +
    231D  LEU*     4.7     4.5    -      -       +      -
    232D  VAL*     4.0    30.7    -      -       +      +
    235D  LEU*     4.0     9.9    -      -       +      -
    241D  GLU      3.0    16.9    +      -       -      +
    242D  LYS      3.8     2.7    -      -       -      +
    244D  THR*     1.3    78.6    -      -       -      +
    246D  SER*     1.3    68.1    +      -       -      +
    248D  SER*     3.8     3.1    -      -       -      -
    249D  VAL*     2.9    29.2    +      -       +      +
----------------------------------------------------------
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Residues in contact with SER 246 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    229D  THR*     6.2     2.7    -      -       -      +
    232D  VAL*     4.6    13.7    -      -       -      -
    242D  LYS      2.9    17.9    +      -       -      -
    243D  MET*     3.2    16.3    +      -       -      +
    245D  LEU*     1.3    79.4    -      -       -      +
    247D  ILE*     1.3    66.5    +      -       -      +
    249D  VAL*     3.2     9.5    +      -       -      +
    250D  LEU*     3.0    25.1    +      -       -      +
    285D  VAL*     4.0     7.0    -      -       -      +
    288D  SER*     5.0     5.4    -      -       -      -
    289D  ILE*     3.4    31.7    -      -       -      +
    292D  THR*     5.2     1.6    -      -       -      -
----------------------------------------------------------
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Residues in contact with ILE 247 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    243D  MET      2.9    28.1    +      -       -      +
    244D  THR*     3.6     6.7    -      -       -      +
    246D  SER*     1.3    78.9    +      -       -      +
    248D  SER*     1.3    63.2    +      -       -      +
    250D  LEU*     3.2    28.5    +      -       +      +
    251D  LEU*     2.9    32.9    +      -       +      +
    289D  ILE*     4.2     3.4    -      -       +      -
    236E  LEU*     4.1     9.0    -      -       +      -
    253E  THR*     4.6     7.6    -      -       +      +
    254E  LEU*     3.5    31.2    -      -       +      -
    257E  SER*     3.4    37.7    -      -       -      +
    258E  VAL*     4.2     9.0    -      -       +      +
----------------------------------------------------------
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Residues in contact with SER 248 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    253C  ILE*     3.2    38.3    -      -       -      +
    254C  SER*     5.4     0.9    +      -       -      -
    257C  LEU*     4.9     5.3    -      -       -      +
    244D  THR*     2.8    27.1    +      -       -      +
    247D  ILE*     1.3    78.5    -      -       -      +
    249D  VAL*     1.3    59.2    +      -       -      +
    251D  LEU*     3.2    14.7    +      -       -      +
    252D  SER*     2.8    33.5    +      -       -      -
----------------------------------------------------------
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Residues in contact with VAL 249 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    253C  ILE*     3.8    19.7    -      -       +      +
    256C  LEU*     5.9     0.2    -      -       +      -
    225D  PHE*     3.8    21.9    -      -       +      +
    228D  LEU*     4.1    21.8    -      -       +      +
    229D  THR*     3.4    30.1    -      -       +      -
    245D  LEU*     2.9    27.2    +      -       +      +
    246D  SER*     3.4    10.1    -      -       -      +
    248D  SER*     1.3    75.3    -      -       -      +
    250D  LEU*     1.3    57.8    +      -       -      +
    252D  SER*     3.3     7.6    +      -       -      -
    253D  LEU*     2.9    27.2    +      -       -      +
    285D  VAL*     4.4     6.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 250 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    246D  SER      3.0    12.1    +      -       -      +
    247D  ILE*     3.3    18.6    -      -       +      +
    248D  SER      3.2     0.4    -      -       -      -
    249D  VAL*     1.3    78.6    -      -       -      +
    251D  LEU*     1.3    54.0    +      -       +      +
    253D  LEU*     3.3     7.4    +      -       -      +
    254D  THR*     2.6    39.2    +      -       -      +
    282D  MET*     4.5     7.7    -      -       -      +
    285D  VAL*     4.1    11.9    -      -       +      +
    286D  ILE*     3.6    25.1    -      -       +      -
    289D  ILE*     3.5    26.2    -      -       +      -
    233E  ILE*     3.8    35.4    -      -       +      -
    236E  LEU*     3.6    10.3    -      -       +      -
    257E  SER      5.8     0.4    -      -       -      +
    258E  VAL*     5.9     0.2    -      -       +      -
    261E  ALA*     4.3     7.6    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 251 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    257C  LEU*     4.1    21.1    -      -       +      -
    247D  ILE*     2.9    21.8    +      -       +      +
    248D  SER*     3.2    17.9    +      -       -      +
    250D  LEU*     1.3    75.3    -      -       +      +
    252D  SER*     1.3    65.4    +      -       -      +
    254D  THR*     3.0     5.3    +      -       -      -
    255D  VAL*     2.9    28.6    +      -       +      +
    257E  SER*     3.6    36.6    -      -       -      +
    260E  LEU*     4.1    26.0    -      -       +      -
    261E  ALA*     3.9    22.7    -      -       +      +
    264E  ILE*     4.5     7.4    -      -       +      +
----------------------------------------------------------
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Residues in contact with SER 252 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    253C  ILE*     4.5     3.5    +      -       -      +
    256C  LEU*     4.1     4.2    -      -       -      +
    257C  LEU*     3.7    33.1    +      -       -      +
    260C  THR*     3.7    16.2    -      -       -      +
    225D  PHE*     3.5    28.5    -      -       -      -
    248D  SER      2.8    18.5    +      -       -      -
    249D  VAL*     3.6     4.8    -      -       -      -
    251D  LEU*     1.3    75.2    -      -       -      +
    253D  LEU*     1.3    57.4    +      -       -      +
    255D  VAL      3.4     0.5    +      -       -      -
    256D  PHE*     2.9    28.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 253 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    222D  CYS*     4.2    15.7    -      -       -      -
    225D  PHE*     3.2    38.5    -      -       +      -
    249D  VAL      2.9    17.6    +      -       -      +
    250D  LEU*     3.6     5.4    -      -       -      +
    251D  LEU      3.2     0.2    -      -       -      -
    252D  SER*     1.3    76.9    -      -       -      +
    254D  THR*     1.3    57.5    +      -       -      +
    256D  PHE*     3.4     5.4    +      -       +      +
    257D  LEU*     2.8    25.8    +      -       -      +
    260D  ILE*     5.4     0.7    -      -       +      +
    278D  MET*     4.9     8.4    -      -       +      +
    281D  THR*     3.9    26.7    -      -       +      -
    282D  MET*     3.6    42.4    -      -       +      +
    285D  VAL*     4.1    11.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with THR 254 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    250D  LEU*     2.6    33.8    +      -       -      +
    251D  LEU*     3.0     9.5    +      -       -      -
    253D  LEU*     1.3    74.0    -      -       -      +
    255D  VAL*     1.3    65.4    +      -       -      +
    257D  LEU*     2.9    20.0    +      -       +      +
    258D  LEU*     3.0    16.6    +      -       +      +
    282D  MET*     4.6     2.6    -      -       -      +
    233E  ILE*     4.2     5.9    -      -       -      +
    261E  ALA*     4.3     5.9    -      -       +      +
    264E  ILE*     3.9    27.6    -      -       +      -
    265E  PHE*     3.6    34.8    -      -       +      -
----------------------------------------------------------
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Residues in contact with VAL 255 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    257C  LEU*     3.8    16.8    -      -       +      -
    260C  THR*     4.2    22.0    -      -       +      +
    261C  VAL*     4.4    15.0    -      -       +      -
    264C  LEU*     4.2    23.5    -      -       +      +
    251D  LEU      2.9    16.6    +      -       -      +
    252D  SER      3.8     3.8    -      -       -      +
    254D  THR*     1.3    74.6    -      -       -      +
    256D  PHE*     1.3    57.7    +      -       -      +
    258D  LEU*     3.1    17.0    -      -       +      +
    259D  VAL*     3.0    24.5    +      -       -      +
    264E  ILE*     4.2    20.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with PHE 256 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    260C  THR*     4.3    11.8    -      -       +      +
    263C  LEU*     4.1    11.2    -      -       +      -
    217D  ASN      2.9    29.4    -      -       -      -
    218D  VAL*     3.0    28.0    -      -       -      -
    221D  PRO*     3.4    28.9    -      -       +      -
    222D  CYS*     3.4    21.8    -      -       -      -
    225D  PHE*     3.9    15.3    -      +       +      -
    252D  SER      2.9    18.7    +      -       -      +
    253D  LEU*     3.6     6.1    -      -       +      +
    255D  VAL*     1.3    75.0    -      -       -      +
    257D  LEU*     1.3    60.0    +      -       -      +
    259D  VAL*     3.2    23.5    +      -       +      +
    260D  ILE*     2.8    48.3    +      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 257 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    253D  LEU      2.8    13.8    +      -       -      +
    254D  THR*     2.9    14.5    +      -       +      +
    256D  PHE*     1.3    73.8    -      -       -      +
    258D  LEU*     1.3    63.6    +      -       -      +
    260D  ILE*     3.3    11.3    +      -       +      +
    261D  VAL*     2.9    29.4    +      -       +      +
    278D  MET*     3.3    41.3    -      -       +      -
    282D  MET*     4.8     5.8    -      -       +      -
    225E  ASN*     3.4    32.1    -      -       +      +
    229E  PRO*     4.3     7.2    -      -       +      -
    265E  PHE*     3.6    31.0    -      -       +      -
    268E  LEU*     4.4     9.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 258 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    264C  LEU*     4.0    24.7    -      -       +      -
    254D  THR*     3.0    13.4    +      -       +      +
    255D  VAL*     3.1    14.4    -      -       +      +
    257D  LEU*     1.3    77.0    -      -       +      +
    259D  VAL*     1.3    63.8    +      -       -      +
    261D  VAL*     3.3     4.0    +      -       -      +
    262D  GLU*     2.9    23.2    +      -       -      +
    264E  ILE*     3.4    32.5    -      -       +      +
    265E  PHE*     5.7     0.4    -      -       +      -
    267E  PHE*     3.3    36.1    -      -       +      -
    268E  LEU*     3.4    33.9    -      -       +      -
    271E  GLN*     5.4     2.9    -      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 259 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    260C  THR      4.8     3.1    -      -       -      +
    263C  LEU*     4.6     6.1    -      -       +      +
    264C  LEU*     3.5    45.5    -      -       +      +
    267C  ALA*     4.7     4.9    -      -       +      -
    217D  ASN*     4.3     8.1    -      -       +      +
    255D  VAL      3.0    15.3    +      -       -      +
    256D  PHE*     3.2    37.9    +      -       +      +
    258D  LEU*     1.3    74.3    -      -       -      +
    260D  ILE*     1.3    65.4    +      -       +      +
    262D  GLU*     3.1     4.7    +      -       -      +
    263D  LEU*     2.9    42.2    +      -       +      +
----------------------------------------------------------
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Residues in contact with ILE 260 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    218D  VAL*     3.8    20.4    -      -       +      -
    222D  CYS*     4.3     5.2    -      -       -      -
    253D  LEU*     5.4     0.7    -      -       +      +
    256D  PHE*     2.8    52.3    +      -       +      +
    257D  LEU*     3.6    15.5    -      -       +      +
    259D  VAL*     1.3    74.7    -      -       -      +
    261D  VAL*     1.3    61.1    +      -       +      +
    263D  LEU*     2.9     5.1    +      -       -      +
    264D  ILE*     2.7    65.8    +      -       +      +
    274D  ILE*     4.1     6.5    -      -       +      -
    278D  MET*     4.0    24.9    -      -       +      -
    225E  ASN*     5.3     3.4    -      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 261 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    257D  LEU*     2.9    23.7    +      -       +      +
    258D  LEU      3.8     3.1    -      -       -      +
    260D  ILE*     1.3    76.6    -      -       +      +
    262D  GLU*     1.3    63.1    +      -       -      +
    263D  LEU      3.5     0.3    +      -       -      -
    264D  ILE*     3.6    13.4    -      -       -      +
    266D  SER*     4.7     4.7    +      -       -      -
    221E  PHE*     3.9    25.1    -      -       +      -
    225E  ASN*     4.5    17.0    -      -       +      +
    268E  LEU*     4.3    26.5    -      -       +      -
    271E  GLN*     5.3     7.2    -      -       -      +
    272E  LYS*     3.9    31.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 262 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    264C  LEU*     3.8    25.0    -      -       -      +
    267C  ALA*     4.5    12.5    -      -       +      +
    268C  ASP*     3.7    24.1    -      -       +      +
    258D  LEU      2.9    11.6    +      -       -      +
    259D  VAL      3.1     9.2    +      -       -      +
    261D  VAL*     1.3    80.4    -      -       -      +
    263D  LEU*     1.3    66.1    +      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 263 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    267C  ALA*     3.7    32.3    -      -       +      +
    213D  TYR*     3.6    33.8    -      -       +      +
    214D  PHE*     4.1    13.7    -      -       +      -
    217D  ASN*     3.7    28.7    -      -       +      -
    218D  VAL*     3.7    16.2    -      -       +      -
    259D  VAL*     2.9    31.4    +      -       +      +
    260D  ILE      2.9     4.7    +      -       -      +
    262D  GLU*     1.3    84.6    -      -       +      +
    264D  ILE*     1.3    72.9    +      -       +      +
----------------------------------------------------------
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Residues in contact with ILE 264 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    135D  PHE*     3.7    17.0    -      -       +      -
    214D  PHE*     3.9    17.9    -      -       +      -
    218D  VAL*     4.0    13.9    -      -       +      -
    260D  ILE*     2.7    46.9    +      -       +      +
    261D  VAL*     3.6    16.8    -      -       -      +
    262D  GLU      4.6     0.5    -      -       -      +
    263D  LEU*     1.3    77.3    -      -       -      +
    265D  PRO*     1.3    82.3    -      -       +      +
    266D  SER*     3.9     0.9    +      -       -      -
    272D  PRO*     5.5     6.7    -      -       +      -
    274D  ILE*     3.5    23.8    -      -       +      -
    275D  GLY*     5.1     4.9    -      -       -      +
    221E  PHE*     5.1     2.4    -      -       +      -
    225E  ASN*     4.9    11.2    -      -       -      +
----------------------------------------------------------
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A short description of the analytical approach
The contact analysis used in this page is based upon the approach developed in: Sobolev V., Wade R.C., Vriend G. and Edelman M. PROTEINS (1996) 25, 120-129. Contact legitimacy depends on the hydrophobic-hydrophilic properties of the contacting atoms. In order to define it, for each inter-atomic contact, eight atom classes have been introduced:


   I  Hydrophilic      - N and O that can donate and accept hydrogen bonds
                         (e.g., oxygen of hydroxyl group of Ser. or Thr)
  II  Acceptor         - N or O that can only accept a hydrogen bond
 III  Donor            - N that can only donate a hydrogen bond
  IV  Hydrophobic      - Cl, Br, I and all C atoms that are not in
                         aromatic rings and do not have a covalent bond to
                         a N or O atom
   V  Aromatic         - C in aromatic rings irrespective of any other 
                         bonds formed by the atom
  VI  Neutral          - C atoms that have a covalent bond to at least one
                         atom of class I or two or more atoms from class II
                         or III; atoms; S, F, P, and metal atoms in all cases
 VII  Neutral-donor    - C atoms that have a covalent bond with only one
                         atom of class III
VIII  Neutral-acceptor - C atoms that have a covalent bond with only 
                         one atom of class II
For each pair of contacts the state of legitimacy is shown below:

Legend:
+, legitimate
-, illegitimate
------------------------------------------------------------
  Atomic class           I  II  III   IV   V   VI  VII  VIII
------------------------------------------------------------
   I  (Hydrophilic)      +   +    +    -   +   +    +    +
  II  (Acceptor)         +   -    +    -   +   +    +    -
 III  (Donor)            +   +    -    -   +   +    -    +
  IV  (Hydrophobic)      -   -    -    +   +   +    +    +
   V  (Aromatic)         +   +    +    +   +   +    +    +
  VI  (Neutral)          +   +    +    +   +   +    +    +
 VII  (Neutral-donor)    +   +    -    +   +   +    -    +
VIII  (Neutral-acceptor) +   -    +    +   +   +    +    -
------------------------------------------------------------
Warning!
Atom classes for heterogroups are automatically assigned based on the atomic coordinates. However, in three cases (see below) the automatic assignment is currently ambiguous. In these cases, the user is advised to manually analyse the full list of contacts using LPC software.
1. Carbon atoms belonging to a 4-, 5- or 6-member ring are 
   considered "aromatic" (Class V) if the ring is approximately
   planar, and "hydrophobic" (Class IV) or "neutral" (Classes
   VI, VII, VIII) if the ring is non-planar.
2. The oxygen atom of a carbonyl or hydroxy group is considered
   "hydroxy" (Class I) if the CO bond is longer than 1.29 Å, and
   "carbonyl" (Class II) if shorter.
3. All nitrogen atoms are considered "hydrophilic" (Class I).

Please E-mail any questions and/or suggestions concerning this page to Vladimir.Sobolev@weizmann.ac.il