Contacts of the helix formed by residues 225 - 250 (chain R) in PDB entry 1RZZ


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 GLY 225 (chain R).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    213R  ASN*     4.3     5.2    -      -       -      -
    223R  SER*     3.4     7.5    +      -       -      -
    224R  ILE*     1.3    83.6    -      -       -      +
    226R  THR*     1.3    66.7    +      -       -      -
    227R  LEU      3.4     2.0    -      -       -      -
    228R  GLY      3.8     0.4    -      -       -      -
    229R  ILE*     3.0    23.1    +      -       -      +
   2009R  U10      4.1     6.2    +      -       -      +
     44S  ASN*     3.3    17.2    -      -       -      +
    173T  GLU*     3.5     9.6    -      -       -      -
----------------------------------------------------------
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Residues in contact with THR 226 (chain R). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    190R  HIS*     5.8     0.4    -      -       -      -
    209R  PRO*     6.5     0.4    -      -       -      -
    212R  GLU*     5.6     5.6    -      -       -      -
    225R  GLY*     1.3    70.8    -      -       -      -
    227R  LEU*     1.3    66.8    +      -       +      +
    229R  ILE*     3.1    11.6    -      -       -      +
    230R  HIS*     2.7    33.3    +      -       -      -
    232S  GLU*     2.4    48.9    +      -       +      +
    233S  CYS*     4.8     5.4    -      -       -      +
    234S  GLU*     4.4     1.6    +      -       -      +
    173T  GLU*     3.2    32.7    +      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 227 (chain R). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    225R  GLY      3.4     0.6    -      -       -      -
    226R  THR*     1.3    86.0    -      -       +      +
    228R  GLY*     1.3    62.3    +      -       -      +
    230R  HIS*     3.5     2.5    +      -       +      +
    231R  ARG*     3.1    53.1    +      -       -      +
      5S  ASN*     3.7    18.4    -      -       -      +
      8S  SER*     5.2     1.1    -      -       -      +
    223S  ILE*     5.2     2.5    -      -       +      -
    224S  LEU*     3.5    28.9    -      -       +      +
    227S  SER*     4.3     1.8    -      -       -      -
    232S  GLU*     3.3    34.8    -      -       +      +
    173T  GLU*     4.5     1.4    +      -       -      +
    175T  MET*     4.3    27.6    -      -       +      -
    194T  GLN*     5.6     2.7    -      -       -      +
----------------------------------------------------------
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Residues in contact with GLY 228 (chain R). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    224R  ILE*     3.7    25.1    +      -       -      +
    225R  GLY      3.3     6.6    +      -       -      -
    226R  THR      3.3     0.6    -      -       -      -
    227R  LEU*     1.3    76.7    -      -       -      +
    229R  ILE*     1.3    55.0    +      -       -      +
    231R  ARG*     3.2     4.4    +      -       -      +
    232R  LEU*     2.8    35.2    +      -       -      +
     42S  PHE*     3.7    23.0    +      -       -      -
     43S  GLY*     4.4     1.0    -      -       -      -
    175T  MET*     5.9     0.6    -      -       -      -
----------------------------------------------------------
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Residues in contact with ILE 229 (chain R). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    186R  ALA*     4.6     4.0    -      -       +      +
    190R  HIS*     3.4    45.8    -      -       +      +
    224R  ILE*     3.4     7.5    -      -       +      +
    225R  GLY      3.0    16.0    +      -       -      +
    226R  THR*     3.1    19.5    -      -       -      +
    228R  GLY*     1.3    75.3    -      -       -      +
    230R  HIS*     1.3    71.0    +      -       +      +
    232R  LEU*     3.3    14.9    +      -       +      +
    233R  GLY      2.9    23.6    +      -       -      -
   2009R  U10      3.3    40.8    -      -       +      +
    216S  PHE*     3.7    11.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with HIS 230 (chain R). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    190R  HIS*     3.0    15.3    +      +       -      -
    226R  THR*     2.7    30.3    +      -       -      -
    227R  LEU      3.5     5.5    +      -       -      +
    228R  GLY      3.3     0.4    -      -       -      -
    229R  ILE*     1.3    79.3    -      -       +      +
    231R  ARG*     1.3    64.8    +      -       -      +
    233R  GLY      4.5     0.2    -      -       -      +
    234R  LEU*     3.3    20.1    +      -       -      +
    216S  PHE*     4.6     2.2    -      +       -      -
    219S  HIS*     3.3    20.0    -      +       -      -
    220S  GLY*     3.6    29.6    -      -       -      +
    223S  ILE*     3.4    30.2    -      -       +      +
    224S  LEU*     4.7     6.1    -      -       +      +
    234S  GLU*     2.8    28.9    +      -       -      -
   2007S  FE2      2.2    26.4    -      -       -      -
----------------------------------------------------------
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Residues in contact with ARG 231 (chain R). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    227R  LEU*     3.1    32.7    +      -       -      +
    228R  GLY*     3.3    11.2    -      -       -      +
    230R  HIS*     1.3    78.3    -      -       -      +
    232R  LEU*     1.3    56.0    +      -       -      +
    234R  LEU*     3.9     2.3    -      -       -      +
    235R  LEU*     3.0    30.0    +      -       -      +
      5S  ASN*     3.0    43.5    +      -       -      +
      6S  ILE*     2.9    34.2    +      -       +      +
      8S  SER*     3.2    27.5    +      -       -      +
     40S  GLY      5.1     0.2    +      -       -      -
     41S  TRP      3.3    13.9    +      -       -      -
     42S  PHE*     2.9    46.7    +      -       +      -
    224S  LEU*     4.1    19.7    -      -       +      +
    175T  MET*     5.0     4.6    -      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 232 (chain R). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    186R  ALA*     4.7     2.9    -      -       +      -
    224R  ILE*     4.1    16.8    -      -       +      -
    228R  GLY      2.8    17.0    +      -       -      +
    229R  ILE*     3.5    20.2    -      -       +      +
    231R  ARG*     1.3    75.0    -      -       -      +
    233R  GLY*     1.3    56.0    +      -       -      +
    235R  LEU*     3.1     4.6    +      -       +      +
    236R  LEU*     2.7    68.8    +      -       +      +
   2009R  U10      3.9    35.7    -      -       +      -
     42S  PHE*     3.8    21.7    -      -       +      -
   2011S  LDA      5.8     4.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLY 233 (chain R). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    183R  ASN*     3.2     8.8    -      -       -      +
    229R  ILE      2.9    11.3    +      -       -      -
    230R  HIS      3.6     0.2    +      -       -      -
    231R  ARG      3.5     0.2    -      -       -      -
    232R  LEU*     1.3    76.3    -      -       -      +
    234R  LEU*     1.3    62.5    +      -       -      +
    236R  LEU*     4.7     1.6    -      -       -      -
    237R  SER*     3.0    23.6    +      -       -      -
    216S  PHE*     3.6    46.2    -      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 234 (chain R). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    116R  HIS*     4.9     7.0    -      -       +      +
    119R  PHE*     6.0     3.4    -      -       +      -
    120R  ALA*     3.7    11.2    -      -       +      -
    230R  HIS      3.3    16.8    +      -       -      +
    231R  ARG      3.9     3.4    -      -       -      +
    232R  LEU      3.3     0.4    -      -       -      -
    233R  GLY*     1.3    74.4    -      -       -      +
    235R  LEU*     1.3    60.6    +      -       +      +
    237R  SER*     3.2     5.0    +      -       -      -
    238R  LEU*     2.9    70.7    +      -       +      +
      6S  ILE*     4.7    11.4    -      -       +      -
    216S  PHE      4.2     5.1    +      -       -      -
    217S  ALA*     3.6    21.8    -      -       -      +
    221S  ALA*     4.1    20.9    -      -       +      +
    224S  LEU*     4.1    23.8    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 235 (chain R). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    179R  PHE*     5.4     5.2    -      -       +      -
    231R  ARG      3.0    20.5    +      -       -      +
    232R  LEU*     3.1     8.3    +      -       +      +
    234R  LEU*     1.3    79.0    -      -       +      +
    236R  LEU*     1.3    57.0    +      -       +      +
    238R  LEU*     4.1     7.0    -      -       +      +
    239R  SER*     2.7    51.4    +      -       -      +
      6S  ILE*     4.8    14.4    -      -       +      -
      7S  PHE*     6.0     3.1    -      -       +      -
     42S  PHE*     4.0    25.6    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 236 (chain R). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    179R  PHE*     3.5    35.7    -      -       +      +
    182R  THR*     3.9    28.0    -      -       +      +
    183R  ASN*     3.6    37.7    -      -       +      +
    186R  ALA*     4.0    11.2    -      -       +      -
    232R  LEU*     2.7    51.8    +      -       +      +
    233R  GLY*     4.8     0.2    -      -       -      -
    235R  LEU*     1.3    75.0    -      -       +      +
    237R  SER*     1.3    57.3    +      -       -      +
    239R  SER*     3.3     0.9    +      -       -      -
    240R  ALA*     2.9    29.7    +      -       -      +
   2009R  U10      5.6     1.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with SER 237 (chain R). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    183R  ASN*     3.6    13.0    +      -       -      -
    233R  GLY      3.0    16.3    +      -       -      -
    234R  LEU      3.2     5.4    +      -       -      -
    236R  LEU*     1.3    76.1    -      -       -      +
    238R  LEU*     1.3    67.4    +      -       -      +
    240R  ALA*     3.5     6.8    +      -       -      +
    241R  VAL*     3.3    28.4    +      -       -      +
   2006R  BPH      4.1     1.7    -      -       -      +
    213S  ALA*     3.2    33.9    -      -       -      +
    217S  ALA*     3.4    21.4    -      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 238 (chain R). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    119R  PHE*     4.7     9.4    -      -       +      -
    120R  ALA*     3.9    26.5    -      -       +      +
    123R  PHE*     3.8    42.4    -      -       +      -
    234R  LEU*     2.9    54.0    +      -       +      +
    235R  LEU*     4.1     8.5    -      -       +      +
    237R  SER*     1.3    83.3    +      -       -      +
    239R  SER*     1.3    57.1    +      -       -      +
    241R  VAL*     3.4     3.8    +      -       -      +
    242R  PHE*     3.0    27.8    +      -       -      +
   2006R  BPH      4.3     7.4    -      -       +      -
    217S  ALA*     4.2     6.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with SER 239 (chain R). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    179R  PHE*     3.7    28.7    -      -       -      -
    235R  LEU*     2.7    40.2    +      -       -      +
    236R  LEU      3.6     4.3    -      -       -      -
    237R  SER      3.2     0.2    -      -       -      -
    238R  LEU*     1.3    76.2    -      -       -      +
    240R  ALA*     1.3    65.1    +      -       -      +
    242R  PHE*     3.3     6.2    +      -       -      +
    243R  PHE*     3.0    37.3    +      -       -      -
----------------------------------------------------------
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Residues in contact with ALA 240 (chain R). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    176R  ALA*     3.7     8.0    -      -       -      +
    179R  PHE*     3.6    21.3    -      -       +      +
    180R  PHE*     3.6    36.6    -      -       +      +
    236R  LEU      2.9    16.8    +      -       -      +
    237R  SER*     3.6     8.7    -      -       -      +
    239R  SER*     1.3    77.7    -      -       -      +
    241R  VAL*     1.3    52.9    +      -       -      +
    243R  PHE      3.5     0.3    +      -       -      -
    244R  SER*     2.7    36.6    +      -       -      -
----------------------------------------------------------
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Residues in contact with VAL 241 (chain R). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    123R  PHE*     3.6    23.1    -      -       +      +
    124R  ALA*     4.4     1.8    -      -       -      -
    127R  ALA*     3.5    28.0    -      -       +      -
    180R  PHE*     4.4     8.3    -      -       +      -
    237R  SER      3.3     9.3    +      -       -      +
    238R  LEU      3.8     5.8    -      -       -      +
    239R  SER      3.2     0.4    -      -       -      -
    240R  ALA*     1.3    74.1    -      -       -      +
    242R  PHE*     1.3    67.1    +      -       -      +
    244R  SER*     3.2     7.2    +      -       -      -
    245R  ALA*     3.0    23.3    +      -       +      +
   2002R  BCL      4.5     8.1    -      -       -      -
   2006R  BPH      3.2    45.8    -      -       +      -
----------------------------------------------------------
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Residues in contact with PHE 242 (chain R). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    123R  PHE*     4.6    19.5    -      +       +      -
    238R  LEU      3.0    17.9    +      -       -      +
    239R  SER*     3.3     7.2    +      -       -      +
    241R  VAL*     1.3    77.1    -      -       -      +
    243R  PHE*     1.3    92.1    +      +       -      +
    245R  ALA*     3.5     6.0    +      -       +      +
    246R  LEU*     2.9    40.5    +      -       +      +
----------------------------------------------------------
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Residues in contact with PHE 243 (chain R). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    172R  ALA*     3.6    11.5    -      -       +      +
    175R  ILE*     3.7    36.1    -      -       +      -
    176R  ALA*     3.8    19.5    -      -       +      -
    179R  PHE*     3.7    23.8    -      +       -      -
    239R  SER*     3.0    30.4    +      -       -      +
    242R  PHE*     1.3    93.1    -      +       -      +
    244R  SER*     1.3    60.1    +      -       -      +
    246R  LEU*     3.6    29.4    -      -       +      +
    247R  CYS*     2.9    29.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with SER 244 (chain R). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    127R  ALA*     5.7     0.2    -      -       -      -
    176R  ALA*     3.8     6.0    -      -       -      +
    180R  PHE*     3.6     4.2    -      -       -      -
    240R  ALA      2.7    18.9    +      -       -      -
    241R  VAL      3.2     9.6    +      -       -      -
    243R  PHE*     1.3    73.8    -      -       -      +
    245R  ALA*     1.3    66.3    +      -       -      +
    247R  CYS*     3.0    15.6    +      -       -      -
    248R  MET      3.1     3.3    +      -       -      -
   2002R  BCL      3.0    75.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 245 (chain R). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    126R  LEU*     4.9     1.1    -      -       +      +
    127R  ALA*     4.3    11.0    -      -       -      -
    130R  THR*     3.6    28.8    -      -       +      +
    241R  VAL*     3.0    12.9    +      -       +      +
    242R  PHE*     3.7     7.2    -      -       +      +
    244R  SER*     1.3    80.0    -      -       -      +
    246R  LEU*     1.3    62.6    +      -       -      +
    248R  MET      3.2     1.2    +      -       -      -
    249R  ILE*     2.9    26.4    +      -       -      +
   2002R  BCL      3.6    10.9    -      -       -      -
----------------------------------------------------------
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Residues in contact with LEU 246 (chain R). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    172R  ALA*     4.3    11.2    -      -       +      -
    242R  PHE*     2.9    34.4    +      -       +      +
    243R  PHE*     3.8    33.9    -      -       +      +
    245R  ALA*     1.3    77.4    -      -       -      +
    247R  CYS*     1.3    61.3    +      -       -      +
    249R  ILE*     3.1    31.1    -      -       +      +
    250R  ILE*     3.3    23.0    -      -       +      +
----------------------------------------------------------
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Residues in contact with CYS 247 (chain R). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    167R  PHE*     4.3     0.2    -      -       -      -
    170R  ASN*     3.0    15.4    +      -       -      +
    172R  ALA*     3.4    22.2    -      -       +      +
    173R  HIS*     3.5    35.4    -      -       -      +
    176R  ALA*     5.5     0.2    -      -       -      -
    243R  PHE      2.9    16.5    +      -       -      +
    244R  SER*     3.0    18.6    +      -       -      -
    246R  LEU*     1.3    76.2    -      -       -      +
    248R  MET*     1.3    61.0    +      -       -      +
    250R  ILE*     3.4     6.7    -      -       -      +
    251R  THR*     2.7    28.1    +      -       -      -
   2002R  BCL      3.1    17.5    -      -       -      -
----------------------------------------------------------
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Residues in contact with MET 248 (chain R). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    130R  THR*     4.9     3.1    -      -       +      -
    131R  LEU*     3.9    13.7    -      -       +      -
    135R  ARG*     3.3    39.4    -      -       -      +
    156R  TRP*     4.0    17.3    -      -       +      -
    160R  THR*     4.2     5.6    -      -       +      -
    167R  PHE*     3.7    30.1    -      -       +      -
    244R  SER      3.1     5.3    +      -       -      +
    245R  ALA*     3.9     2.9    -      -       -      +
    247R  CYS*     1.3    76.3    -      -       -      +
    249R  ILE*     1.3    65.2    +      -       -      +
    250R  ILE      3.1     2.2    -      -       -      -
    251R  THR*     3.0    15.7    +      -       -      +
   2002R  BCL      3.2    72.0    -      -       +      +
----------------------------------------------------------
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Residues in contact with ILE 249 (chain R). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    130R  THR*     4.1    13.2    -      -       +      +
    134R  PHE*     3.9    26.0    -      -       +      -
    135R  ARG*     4.0    14.4    -      -       -      +
    138R  MET*     3.7    30.9    -      -       +      +
    245R  ALA      2.9    15.4    +      -       -      +
    246R  LEU*     3.1    30.7    -      -       +      +
    248R  MET*     1.3    77.0    -      -       -      +
    250R  ILE*     1.3    59.6    +      -       +      +
    253R  THR*     2.7    33.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 250 (chain R). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    170R  ASN*     4.2     7.6    -      -       -      +
    171R  PRO*     5.3     3.8    -      -       +      -
    172R  ALA*     4.5     7.9    -      -       +      -
    246R  LEU*     3.3    31.2    -      -       +      +
    247R  CYS*     3.4    13.0    -      -       -      +
    249R  ILE*     1.3    85.4    -      -       +      +
    251R  THR*     1.3    63.8    +      -       -      +
    253R  THR*     3.4     7.2    -      -       -      -
    254R  ILE*     3.2    32.3    +      -       +      +
    255R  TRP*     3.1    27.2    +      -       -      +
    259R  TRP*     3.6    26.2    -      -       +      -
----------------------------------------------------------
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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