Contacts of the helix formed by residues 125 - 149 (chain J) in PDB entry 2QJK


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 ARG 125 (chain J).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    119J  GLY      4.6     0.6    +      -       -      -
    120J  SER      3.0    26.8    -      -       -      +
    121J  TYR      3.8     6.0    -      -       -      +
    122J  LYS      3.7     5.1    +      -       -      +
    123J  ALA      3.1     3.8    -      -       -      -
    124J  PRO*     1.3    82.3    -      -       +      +
    126J  GLU*     1.3    64.7    +      -       -      +
    127J  VAL      3.5     1.3    -      -       -      -
    128J  THR*     3.5    15.9    -      -       -      +
    129J  TRP*     3.3    18.9    +      -       -      +
    219J  THR*     4.2    12.7    +      -       -      +
    220J  GLY      3.8     6.7    +      -       -      -
    221J  ASN      3.3     9.9    +      -       -      -
    222J  ASN*     2.9    49.8    +      -       -      +
    223J  ASN*     5.3     0.2    -      -       -      +
    228J  GLU*     3.2    25.3    +      -       -      -
    355J  ARG*     3.4    30.5    -      -       -      +
    501J  HEM      3.0    30.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 126 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     18G  TRP*     3.7    26.8    +      -       +      -
     22G  ARG*     2.6    35.8    +      -       -      +
    121J  TYR      3.9    14.1    -      -       -      +
    123J  ALA*     2.9    37.1    -      -       -      +
    124J  PRO      2.9     3.3    +      -       -      -
    125J  ARG*     1.3    73.2    -      -       -      +
    127J  VAL*     1.3    65.7    +      -       -      +
    129J  TRP*     3.0     7.9    +      -       -      +
    130J  ILE*     2.9    26.0    +      -       +      +
    347J  PRO*     4.1    16.3    -      -       +      +
    348J  TRP*     4.4    17.1    +      -       +      -
----------------------------------------------------------
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Residues in contact with VAL 127 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     18G  TRP*     4.4    10.5    -      -       +      -
     19G  LEU*     4.4    19.3    -      -       +      -
     22G  ARG*     4.0    31.2    -      -       +      -
     23G  LEU*     4.2    26.7    -      -       +      -
    124J  PRO      4.5     0.6    +      -       -      -
    125J  ARG      3.5     0.2    -      -       -      -
    126J  GLU*     1.3    75.9    -      -       -      +
    128J  THR*     1.3    69.6    +      -       -      +
    130J  ILE*     3.1    13.2    +      -       +      +
    131J  VAL*     2.9    35.3    +      -       +      +
    215J  ALA*     4.7     5.8    -      -       +      -
----------------------------------------------------------
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Residues in contact with THR 128 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    125J  ARG*     3.5    22.0    +      -       -      +
    127J  VAL*     1.3    82.8    -      -       -      +
    129J  TRP*     1.3    64.2    +      -       -      +
    131J  VAL*     3.1     4.3    +      -       -      +
    132J  GLY*     2.8    19.2    +      -       -      -
    212J  HIS*     3.6    30.6    +      -       +      +
    215J  ALA*     3.9    22.6    +      -       -      +
    216J  PHE*     3.9    17.6    +      -       +      +
    219J  THR*     4.8     3.3    +      -       -      +
    501J  HEM      3.8    31.8    +      -       +      -
----------------------------------------------------------
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Residues in contact with TRP 129 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    112J  ILE*     4.3    19.5    -      -       +      -
    115J  GLY*     4.6     5.4    -      -       -      -
    116J  LEU*     3.8    25.8    -      -       +      -
    121J  TYR*     3.4    30.7    -      +       +      -
    125J  ARG      3.3     9.5    +      -       -      +
    126J  GLU*     3.0    10.2    +      -       -      +
    128J  THR*     1.3    78.7    -      -       -      +
    130J  ILE*     1.3    67.5    +      -       +      +
    132J  GLY      3.2     2.1    +      -       -      +
    133J  MET*     3.0    30.6    +      -       +      +
    343J  MET*     3.2    37.4    +      -       +      -
    344J  ALA*     3.6    21.3    +      -       -      +
    346J  VAL*     3.4    11.8    -      -       +      +
    347J  PRO*     3.7    11.4    -      -       +      -
    501J  HEM      3.3    58.0    -      -       +      +
----------------------------------------------------------
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Residues in contact with ILE 130 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     18G  TRP*     5.0     7.0    -      -       +      -
    126J  GLU*     2.9    24.9    +      -       +      +
    127J  VAL*     3.1    11.2    +      -       +      +
    129J  TRP*     1.3    76.8    -      -       +      +
    131J  VAL*     1.3    67.1    +      -       +      +
    133J  MET*     2.9    20.1    +      -       +      +
    134J  LEU*     3.0    25.3    +      -       +      +
    344J  ALA*     5.2     2.9    -      -       +      +
    348J  TRP*     3.8    32.8    -      -       +      -
----------------------------------------------------------
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Residues in contact with VAL 131 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     23G  LEU*     5.8     0.2    -      -       +      -
    127J  VAL*     2.9    33.4    +      -       +      +
    128J  THR*     3.5     7.6    -      -       -      +
    130J  ILE*     1.3    72.7    -      -       +      +
    132J  GLY*     1.3    65.6    +      -       -      +
    134J  LEU*     2.8    29.7    +      -       +      +
    135J  ILE*     2.9    16.4    +      -       +      +
    208J  LEU*     4.0    18.4    -      -       +      +
    211J  ILE*     4.2    19.3    -      -       +      -
    212J  HIS*     3.9    33.9    -      -       +      +
    215J  ALA*     5.7     1.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLY 132 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    128J  THR      2.8    13.4    +      -       -      -
    129J  TRP      3.2     0.9    +      -       -      -
    131J  VAL*     1.3    77.0    -      -       -      +
    133J  MET*     1.3    56.8    +      -       -      +
    135J  ILE*     3.1     7.4    +      -       -      +
    136J  TYR      2.9    13.7    +      -       -      -
    212J  HIS*     4.0     6.4    +      -       -      -
    501J  HEM      2.8    53.6    -      -       -      +
----------------------------------------------------------
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Residues in contact with MET 133 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    112J  ILE*     5.3     1.3    -      -       -      -
    129J  TRP*     3.0    38.2    +      -       +      +
    130J  ILE*     2.9    12.6    +      -       +      +
    132J  GLY*     1.3    71.2    -      -       -      +
    134J  LEU*     1.3    67.8    +      -       +      +
    136J  TYR*     3.0    15.3    +      -       +      +
    137J  LEU*     2.9    28.2    +      -       +      +
    340J  ILE*     3.8    40.4    -      -       +      +
    343J  MET*     3.9    18.2    -      -       +      -
    344J  ALA*     3.9    24.0    -      -       +      +
    501J  HEM      3.0    18.3    -      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 134 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    130J  ILE*     3.0    19.6    +      -       +      +
    131J  VAL*     2.8    30.6    +      -       +      +
    133J  MET*     1.3    70.9    -      -       +      +
    135J  ILE*     1.3    64.9    +      -       -      +
    137J  LEU*     3.1    23.2    +      -       +      +
    138J  ALA*     2.9    22.0    +      -       -      +
    208J  LEU*     3.9    24.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with ILE 135 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    131J  VAL*     2.9    12.3    +      -       +      +
    132J  GLY*     3.1    18.4    -      -       -      +
    134J  LEU*     1.3    76.9    -      -       -      +
    136J  TYR*     1.3    54.8    +      -       -      +
    138J  ALA*     3.0     7.7    +      -       -      +
    139J  MET*     2.7    50.9    +      -       +      +
    205J  ILE*     4.3     6.5    -      -       +      +
    208J  LEU*     3.8    20.9    -      -       +      -
    209J  VAL*     4.0    24.0    -      -       +      +
    212J  HIS*     4.1    18.4    -      -       +      -
    501J  HEM      3.2    48.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with TYR 136 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    105J  PHE*     4.3    17.0    -      +       -      -
    108J  VAL*     4.5    13.7    -      -       +      -
    109J  TYR*     2.7    44.7    +      +       -      -
    112J  ILE*     4.4    13.7    -      -       +      -
    132J  GLY      2.9     6.8    +      -       -      +
    133J  MET*     3.0    30.9    +      -       +      +
    135J  ILE*     1.3    76.5    -      -       -      +
    137J  LEU*     1.3    66.0    +      -       +      +
    139J  MET*     3.5     6.3    -      -       -      +
    140J  MET*     3.2    48.0    +      -       +      +
    301J  PHE*     3.1    28.1    -      +       -      -
    340J  ILE*     4.6     6.3    -      -       +      -
    343J  MET*     4.4    11.0    -      -       +      -
    501J  HEM      3.6    16.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 137 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    133J  MET*     2.9    13.4    +      -       +      +
    134J  LEU*     3.2    29.2    -      -       +      +
    136J  TYR*     1.3    76.6    -      -       +      +
    138J  ALA*     1.3    64.7    +      -       -      +
    140J  MET*     3.1    17.8    +      -       +      +
    141J  ALA*     2.9    22.9    +      -       -      +
    337J  PHE*     5.7     7.2    -      -       +      -
    340J  ILE*     5.7    11.9    -      -       +      -
    503J  SMA      3.9    24.7    -      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 138 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    134J  LEU      2.9     9.0    +      -       -      +
    135J  ILE*     3.3    10.3    -      -       -      +
    137J  LEU*     1.3    78.8    -      -       -      +
    139J  MET*     1.3    65.4    +      -       -      +
    141J  ALA*     3.1     9.1    +      -       -      +
    142J  THR*     2.8    28.7    +      -       -      -
    201J  LEU*     3.9    13.5    -      -       +      +
    204J  VAL*     5.9     2.9    -      -       +      -
    205J  ILE*     3.9    21.1    -      -       +      +
    208J  LEU*     5.2     7.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with MET 139 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    104J  PHE*     3.5    52.5    -      -       +      +
    105J  PHE*     4.0    21.3    -      -       +      -
    108J  VAL*     3.9    34.8    -      -       +      -
    135J  ILE*     2.7    44.2    +      -       +      +
    136J  TYR*     3.5     9.0    -      -       -      +
    138J  ALA*     1.3    73.5    -      -       -      +
    140J  MET*     1.3    55.2    +      -       -      +
    142J  THR*     3.0     3.4    +      -       -      -
    143J  ALA*     2.8    34.0    +      -       -      +
    205J  ILE*     3.8    18.6    -      -       +      +
    501J  HEM      4.4     1.1    -      -       -      -
    502J  HEM      4.9     3.7    -      -       +      +
----------------------------------------------------------
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Residues in contact with MET 140 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    105J  PHE*     3.9    20.9    -      -       +      -
    109J  TYR*     5.0     0.2    -      -       -      -
    136J  TYR*     3.2    53.8    +      -       +      +
    137J  LEU*     3.1    10.8    +      -       +      +
    139J  MET*     1.3    75.7    -      -       -      +
    141J  ALA*     1.3    72.7    +      -       -      +
    142J  THR      3.0     0.3    +      -       -      -
    143J  ALA*     3.5     2.4    -      -       -      +
    144J  PHE*     2.9    22.0    +      -       -      +
    298J  PHE*     3.7    33.4    -      -       +      -
    301J  PHE*     4.8     4.3    -      -       -      -
    340J  ILE*     3.9    10.5    -      -       +      -
    503J  SMA      3.7    45.1    -      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 141 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    137J  LEU      2.9    16.0    +      -       -      +
    138J  ALA*     3.3    11.0    -      -       -      +
    140J  MET*     1.3    75.2    -      -       -      +
    142J  THR*     1.3    67.0    +      -       -      +
    144J  PHE*     3.1    14.9    +      -       -      +
    145J  MET*     3.1    15.9    +      -       +      +
    201J  LEU*     3.7    14.4    -      -       +      -
    503J  SMA      4.1    33.0    +      -       +      -
----------------------------------------------------------
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Residues in contact with THR 142 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    138J  ALA      2.8    20.9    +      -       -      -
    139J  MET      3.0     9.4    -      -       -      -
    141J  ALA*     1.3    70.4    -      -       -      +
    143J  ALA*     1.3    54.9    +      -       -      +
    144J  PHE      2.7    12.8    +      -       -      -
    145J  MET*     2.7    29.4    +      -       -      +
    146J  GLY      3.0     8.8    +      -       -      -
    198J  HIS*     3.4    28.6    +      -       +      +
    201J  LEU*     3.3    21.8    -      -       +      +
    202J  PRO*     4.0     9.0    -      -       +      -
    205J  ILE*     3.9     7.3    -      -       -      +
    502J  HEM      3.4    28.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 143 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    101J  ALA*     5.5     0.2    -      -       +      -
    105J  PHE*     3.7    28.3    -      -       +      -
    139J  MET      2.8    17.8    +      -       -      +
    140J  MET*     3.5     4.7    -      -       -      +
    142J  THR*     1.3    73.9    -      -       -      +
    144J  PHE*     1.3    60.0    +      -       -      +
    146J  GLY      3.9     1.3    -      -       -      -
    147J  TYR*     3.2    21.7    +      -       -      +
    295J  GLU*     4.8     0.5    -      -       -      +
    297J  TYR*     3.9    16.2    +      -       +      +
    298J  PHE*     4.7     1.8    -      -       +      -
    502J  HEM      3.7    30.2    -      -       +      +
----------------------------------------------------------
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Residues in contact with PHE 144 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    140J  MET      2.9     9.2    +      -       -      +
    141J  ALA      3.2     7.6    -      -       -      +
    142J  THR      2.7     4.8    +      -       -      -
    143J  ALA*     1.3    72.1    -      -       -      +
    145J  MET*     1.3    72.4    +      -       +      +
    147J  TYR*     3.1    16.2    +      -       +      +
    148J  VAL*     3.2    16.6    +      -       +      +
    158J  GLY      4.2     1.3    -      -       -      -
    159J  ALA*     3.8    24.5    -      -       -      -
    162J  ILE*     3.5    45.5    -      -       +      -
    163J  THR*     5.0     1.1    -      -       +      -
    194J  PHE*     3.6    32.8    -      +       -      -
    295J  GLU*     5.1     2.2    -      -       -      -
    298J  PHE*     4.5     9.1    -      -       +      -
    503J  SMA      3.8    59.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with MET 145 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    141J  ALA      3.1    29.4    +      -       -      +
    142J  THR*     2.7    18.1    +      -       -      +
    144J  PHE*     1.3    85.6    -      -       +      +
    146J  GLY*     1.3    63.3    +      -       -      +
    148J  VAL*     2.9    25.4    +      -       -      +
    149J  LEU*     3.2    12.2    +      -       -      +
    194J  PHE*     3.7    37.6    -      -       +      +
    197J  LEU*     3.7    34.3    -      -       +      -
    198J  HIS*     4.2     9.2    -      -       +      +
    201J  LEU*     3.7    17.3    -      -       +      -
    503J  SMA      3.6    20.0    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLY 146 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    142J  THR      3.0    10.1    +      -       -      -
    143J  ALA      4.1     0.2    -      -       -      -
    145J  MET*     1.3    76.8    -      -       -      +
    147J  TYR*     1.3    63.5    +      -       -      +
    148J  VAL      2.9     1.6    +      -       -      -
    149J  LEU*     3.0    16.0    +      -       -      +
    150J  PRO*     3.2    10.6    -      -       -      +
    198J  HIS*     3.5    29.5    +      -       -      -
    502J  HEM      3.4    23.5    -      -       -      +
----------------------------------------------------------
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Residues in contact with TYR 147 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    143J  ALA      3.2    13.8    +      -       -      +
    144J  PHE*     3.1    10.6    +      +       +      +
    146J  GLY*     1.3    75.0    -      -       -      +
    148J  VAL*     1.3    52.9    +      -       +      +
    150J  PRO*     3.4     5.8    -      -       -      +
    154J  MET*     3.4    40.6    -      -       +      +
    155J  SER*     2.7    29.4    +      -       -      -
    158J  GLY*     6.2     0.4    -      -       -      -
    275J  GLY*     6.4     0.7    -      -       -      -
    276J  HIS*     3.6    25.4    +      -       -      +
    279J  ASN*     3.5    23.8    +      -       +      +
    293J  VAL      5.6     0.4    +      -       -      -
    295J  GLU*     3.2    46.8    -      -       +      +
    297J  TYR*     5.1     0.2    -      -       -      +
    502J  HEM      3.7    33.2    -      -       +      -
    503J  SMA      4.5     4.3    -      -       -      -
----------------------------------------------------------
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Residues in contact with VAL 148 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    144J  PHE*     3.2    33.6    +      -       +      +
    145J  MET      2.9     9.8    +      -       -      +
    147J  TYR*     1.3    77.7    -      -       -      +
    149J  LEU*     1.3    53.2    +      -       -      +
    151J  TRP*     2.8    54.8    +      -       +      -
    155J  SER*     3.3    20.6    -      -       -      +
    159J  ALA*     4.1    11.7    -      -       +      -
    191J  LEU*     4.3     8.5    -      -       +      -
    194J  PHE*     3.7    31.6    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 149 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     69J  TYR*     2.7    38.6    +      -       +      +
     76J  ALA*     3.9     1.7    -      -       -      +
    145J  MET      3.4     8.5    -      -       -      +
    146J  GLY      3.0     7.2    +      -       -      +
    148J  VAL*     1.3    71.7    -      -       -      +
    150J  PRO*     1.3    61.3    -      -       +      +
    151J  TRP*     2.6    24.5    +      -       -      +
    191J  LEU*     3.8    18.0    -      -       +      +
    194J  PHE*     4.6     2.9    -      -       +      -
    195J  PHE*     4.0    31.0    -      -       +      +
    198J  HIS*     3.5    29.2    -      -       +      -
    502J  HEM      3.5    37.5    -      -       +      -
----------------------------------------------------------
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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