Contacts of the helix formed by residues 130 - 155 (chain L) in PDB entry 2EHO


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 130 (chain L).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     88L  LEU*     3.7    17.4    -      -       -      +
     93L  GLN*     5.0     3.6    -      -       -      +
     94L  GLU*     4.7     2.8    +      -       -      +
     97L  ARG*     2.7    44.7    +      -       -      +
    128L  SER*     2.9    14.1    +      -       -      +
    129L  PRO*     1.3    85.5    -      -       +      +
    131L  ASN*     1.3    59.2    +      -       -      +
    132L  ALA      3.4     2.5    -      -       -      -
    133L  ASP*     3.2    10.4    +      -       -      +
    134L  ILE*     2.8    35.0    +      -       +      +
----------------------------------------------------------
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Residues in contact with ASN 131 (chain L). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    174K  LEU*     4.2    16.6    -      -       +      +
    123L  LEU      4.8     1.6    +      -       -      -
    124L  LEU*     3.1    49.4    -      -       -      +
    127L  ASP*     3.6    10.7    -      -       -      +
    128L  SER*     2.9    35.2    +      -       -      +
    129L  PRO      3.2     2.2    -      -       -      -
    130L  GLU*     1.3    75.3    -      -       -      +
    132L  ALA*     1.3    67.7    +      -       -      +
    134L  ILE*     3.1     6.8    +      -       -      +
    135L  SER*     2.8    28.8    +      -       -      -
----------------------------------------------------------
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Residues in contact with ALA 132 (chain L). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    174K  LEU*     4.5    14.5    -      -       +      +
    129L  PRO      4.6     4.9    +      -       -      +
    130L  GLU      3.4     0.4    -      -       -      -
    131L  ASN*     1.3    77.1    -      -       -      +
    133L  ASP*     1.3    69.7    +      -       -      +
    135L  SER*     3.9     1.2    -      -       -      -
    136L  GLN*     3.1    27.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASP 133 (chain L). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     97L  ARG*     3.2    37.2    +      -       -      +
    129L  PRO      5.3     1.0    -      -       -      +
    130L  GLU*     3.2    11.8    +      -       -      +
    131L  ASN      3.1     0.6    -      -       -      -
    132L  ALA*     1.3    85.9    -      -       -      +
    134L  ILE*     1.3    60.4    +      -       -      +
    136L  GLN*     3.9     4.7    -      -       -      +
    137L  SER*     3.1    23.0    +      -       -      -
----------------------------------------------------------
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Residues in contact with ILE 134 (chain L). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     88L  LEU*     3.7    40.8    -      -       +      -
     92L  TYR*     3.8    41.3    -      -       +      +
     97L  ARG*     4.2     8.3    -      -       -      +
    120L  GLY*     4.6     3.1    -      -       -      +
    123L  LEU*     5.4     3.1    -      -       +      +
    124L  LEU*     4.0    19.3    -      -       +      -
    128L  SER*     5.1     0.7    -      -       -      +
    130L  GLU*     2.8    29.0    +      -       +      +
    131L  ASN*     3.8    11.4    -      -       -      +
    133L  ASP*     1.3    71.1    -      -       -      +
    135L  SER*     1.3    68.0    +      -       -      +
    137L  SER*     3.0     6.9    +      -       -      -
    138L  LEU*     3.0    28.4    +      -       +      +
----------------------------------------------------------
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Residues in contact with SER 135 (chain L). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    170K  LEU      4.0     6.1    +      -       -      +
    171K  ARG      5.9     0.2    -      -       -      -
    173K  ASN*     2.8    26.4    +      -       -      +
    174K  LEU*     3.6    27.6    -      -       -      +
    124L  LEU*     4.4     5.3    -      -       -      +
    131L  ASN      2.8    21.0    +      -       -      -
    132L  ALA      3.9     1.3    -      -       -      -
    134L  ILE*     1.3    74.3    -      -       -      +
    136L  GLN*     1.3    63.6    +      -       -      +
    138L  LEU*     3.3    21.6    +      -       -      +
    139L  LEU*     3.3    13.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLN 136 (chain L). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    132L  ALA      3.1    16.8    +      -       -      +
    133L  ASP*     3.9     5.4    -      -       -      +
    135L  SER*     1.3    76.2    -      -       -      +
    137L  SER*     1.3    66.9    +      -       -      +
    139L  LEU*     3.6     7.6    +      -       +      +
    140L  GLN*     2.7    47.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with SER 137 (chain L). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     97L  ARG*     3.5    33.8    +      -       -      +
    100L  PHE*     4.4     8.7    -      -       -      +
    116L  PHE*     5.3     3.0    -      -       -      -
    133L  ASP      3.1    14.6    +      -       -      -
    134L  ILE*     3.0    10.6    +      -       -      -
    136L  GLN*     1.3    75.4    +      -       -      +
    138L  LEU*     1.3    61.3    +      -       -      +
    140L  GLN*     3.0     8.6    +      -       -      +
    141L  THR*     2.5    42.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 138 (chain L). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    170K  LEU*     4.3    11.2    -      -       +      -
    173K  ASN*     3.9    20.4    -      -       -      +
     92L  TYR*     4.0    16.6    -      -       +      -
    116L  PHE*     3.8    39.0    -      -       +      +
    117L  TYR*     3.5    26.2    -      -       +      +
    120L  GLY*     3.9     4.3    -      -       -      +
    121L  SER*     3.6    27.4    -      -       -      +
    124L  LEU*     5.2     0.9    -      -       +      -
    134L  ILE*     3.0    22.1    +      -       +      +
    135L  SER*     3.6     8.3    -      -       -      +
    137L  SER*     1.3    77.6    -      -       -      +
    139L  LEU*     1.3    62.8    +      -       -      +
    141L  THR*     3.3     7.7    +      -       -      +
    142L  PHE*     3.1    16.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 139 (chain L). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    139K  GLN*     4.5    10.1    -      -       -      +
    167K  MSE      4.3    14.1    -      -       +      +
    170K  LEU*     4.1    26.6    -      -       +      +
    171K  ARG*     4.0    43.1    -      -       +      +
    135L  SER      3.3     8.7    +      -       -      +
    136L  GLN*     3.8    11.2    -      -       +      +
    137L  SER      3.2     0.4    -      -       -      -
    138L  LEU*     1.3    78.0    -      -       -      +
    140L  GLN*     1.3    65.3    +      -       -      +
    142L  PHE*     3.0     3.1    +      -       -      +
    143L  ILE*     3.0    54.2    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLN 140 (chain L). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    101L  SER*     2.8    43.2    +      -       -      +
    104L  PRO*     4.6     4.7    -      -       +      +
    136L  GLN*     2.7    42.7    +      -       -      +
    137L  SER*     3.5     6.1    -      -       -      +
    139L  LEU*     1.3    79.7    -      -       -      +
    141L  THR*     1.3    62.7    +      -       +      +
    143L  ILE*     3.6     8.0    +      -       -      +
    144L  GLY*     3.1    19.8    +      -       -      -
----------------------------------------------------------
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Residues in contact with THR 141 (chain L). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    100L  PHE*     4.0    28.3    -      -       +      -
    104L  PRO*     3.8    17.5    -      -       -      +
    109L  LEU*     4.6     1.2    -      -       -      +
    116L  PHE*     4.0    19.3    -      -       +      -
    117L  TYR*     3.7    10.2    +      -       -      -
    137L  SER*     2.5    49.6    +      -       -      +
    138L  LEU*     3.5     9.6    -      -       -      +
    140L  GLN*     1.3    71.6    -      -       +      +
    142L  PHE*     1.3    61.5    +      -       -      +
    144L  GLY      3.6     0.8    +      -       -      -
    145L  ARG*     2.8    34.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with PHE 142 (chain L). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    163K  ALA*     3.9    17.5    -      -       +      -
    166K  HIS*     4.1    10.5    -      -       +      -
    167K  MSE      3.6    36.3    -      -       +      -
    170K  LEU*     4.3    15.3    -      -       +      -
    117L  TYR*     3.6    31.2    -      +       +      -
    138L  LEU      3.1     6.2    +      -       -      +
    139L  LEU      3.0     8.9    +      -       -      +
    141L  THR*     1.3    74.9    +      -       -      +
    143L  ILE*     1.3    58.8    +      -       -      +
    144L  GLY      2.9     1.1    -      -       -      -
    145L  ARG*     2.5    28.1    +      -       -      -
    146L  PHE*     3.0    21.3    +      +       +      -
    149L  ILE*     4.4    18.8    -      -       +      -
    171L  MSE      4.5    16.4    -      -       +      -
    172L  GLU*     4.8     2.5    -      -       +      -
    175L  LEU*     3.7    30.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with ILE 143 (chain L). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    133K  ASP*     5.4     1.2    -      -       -      +
    136K  VAL*     3.4    38.7    -      -       +      +
    137K  ARG*     3.9    36.9    +      -       +      +
    139K  GLN*     5.4     4.0    -      -       +      +
    167K  MSE      3.7    19.1    -      -       +      -
    171K  ARG*     4.8     2.9    -      -       -      +
    139L  LEU*     3.0    39.9    -      -       +      +
    140L  GLN*     3.7     8.1    -      -       +      +
    142L  PHE*     1.3    76.5    -      -       -      +
    144L  GLY*     1.3    62.8    +      -       -      +
    145L  ARG      3.4     0.2    +      -       -      -
    146L  PHE*     3.5    15.8    +      -       -      +
    147L  ARG      4.8     0.9    +      -       -      -
----------------------------------------------------------
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Residues in contact with GLY 144 (chain L). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    137K  ARG*     4.0    22.0    +      -       -      -
    104L  PRO*     4.5    14.1    -      -       -      -
    105L  ASN*     3.1    21.7    +      -       -      +
    140L  GLN      3.1    13.0    +      -       -      -
    141L  THR      4.0     2.9    -      -       -      -
    142L  PHE      2.8     2.6    +      -       -      -
    143L  ILE*     1.3    81.6    -      -       -      +
    145L  ARG*     1.3    56.7    +      -       -      -
    146L  PHE      3.8     0.2    +      -       -      -
    147L  ARG*     4.9     2.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 145 (chain L). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    100L  PHE*     6.3     0.2    -      -       -      -
    104L  PRO*     3.3    27.0    +      -       +      -
    105L  ASN*     3.0    22.2    +      -       -      +
    107L  VAL*     2.8    27.9    +      -       -      +
    109L  LEU*     3.0    23.4    -      -       -      +
    117L  TYR*     4.3     0.2    -      -       -      +
    141L  THR*     2.8    22.4    -      -       -      +
    142L  PHE      2.5    12.1    +      -       -      +
    144L  GLY*     1.3    73.9    -      -       -      -
    146L  PHE*     1.3    62.6    +      -       -      +
    147L  ARG      3.4     1.8    -      -       -      -
    148L  ARG*     3.3     6.3    +      -       +      +
    149L  ILE*     3.0    34.9    +      -       +      +
    167L  ARG*     3.1    21.0    +      -       -      +
    168L  LEU*     3.6    11.6    -      -       -      +
    172L  GLU*     2.7    39.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with PHE 146 (chain L). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    132K  ALA*     4.0     3.4    -      -       +      -
    133K  ASP*     3.9    27.1    -      -       +      -
    136K  VAL*     4.2    24.5    -      -       +      -
    159K  PHE*     3.9    14.1    -      +       -      -
    160K  LEU*     4.1    15.3    -      -       +      -
    163K  ALA*     3.6    31.4    -      -       +      -
    167K  MSE      5.7     0.4    -      -       -      -
    142L  PHE*     3.0    20.8    +      +       +      +
    143L  ILE*     3.7    15.0    -      -       -      +
    144L  GLY      3.5     1.4    -      -       -      -
    145L  ARG*     1.3    75.7    -      -       -      +
    147L  ARG*     1.3    70.3    +      -       -      +
    149L  ILE*     3.0    10.9    +      -       +      +
    150L  MSE      2.8    61.8    +      -       +      +
    175L  LEU*     5.0     3.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with ARG 147 (chain L). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    129K  ARG*     3.9    14.3    -      -       -      +
    130K  VAL*     3.4    33.9    -      -       -      +
    133K  ASP*     2.5    32.8    +      -       -      +
    137K  ARG*     5.0     8.3    -      -       -      +
    105L  ASN*     5.9     0.4    -      -       -      +
    143L  ILE      4.8     1.6    +      -       -      -
    144L  GLY      4.9     2.4    +      -       -      +
    145L  ARG      3.4     0.4    -      -       -      -
    146L  PHE*     1.3    84.2    -      -       -      +
    148L  ARG*     1.3    59.6    +      -       +      +
    150L  MSE      3.0    11.7    +      -       -      +
    151L  ASP*     2.6    70.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 148 (chain L). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    105L  ASN*     2.7    61.2    +      -       -      +
    145L  ARG*     3.3     9.5    +      -       +      +
    147L  ARG*     1.3    81.1    -      -       +      +
    149L  ILE*     1.3    61.6    +      -       +      +
    151L  ASP*     4.0     6.1    -      -       -      +
    152L  SER*     3.2    24.6    +      -       -      -
    164L  LEU*     3.5    25.3    -      -       +      +
----------------------------------------------------------
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Residues in contact with ILE 149 (chain L). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    159K  PHE*     4.5     8.3    -      -       +      -
    142L  PHE*     4.4    12.3    -      -       +      -
    145L  ARG*     3.0    27.6    +      -       +      +
    146L  PHE*     3.0     8.6    +      -       +      +
    148L  ARG*     1.3    77.7    -      -       +      +
    150L  MSE      1.3    60.4    +      -       -      +
    152L  SER*     3.3     4.8    +      -       -      -
    153L  SER*     2.8    38.0    +      -       -      +
    164L  LEU*     5.0     2.9    -      -       +      -
    168L  LEU*     3.9    19.5    -      -       +      -
    172L  GLU*     3.5    52.5    -      -       +      +
    175L  LEU*     4.7     6.5    -      -       +      -
    176L  PHE*     4.3    13.6    -      -       +      +
----------------------------------------------------------
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Residues in contact with MSE 150 (chain L). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    128K  LEU*     6.5     0.2    -      -       -      -
    129K  ARG*     3.1    59.3    -      -       +      +
    132K  ALA*     4.0     9.2    -      -       -      -
    133K  ASP*     4.3     1.6    -      -       +      +
    159K  PHE*     3.6    33.8    -      -       +      -
    160K  LEU*     4.5     7.0    -      -       -      -
    146L  PHE*     2.8    51.9    +      -       +      +
    147L  ARG*     3.8    12.3    -      -       -      +
    149L  ILE*     1.3    69.7    -      -       -      +
    151L  ASP*     1.3    68.7    +      -       -      +
    153L  SER*     3.0    15.3    +      -       -      -
    154L  GLN*     3.4    16.9    +      -       +      +
----------------------------------------------------------
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Residues in contact with ASP 151 (chain L). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    129K  ARG*     3.3    28.5    +      -       -      +
    147L  ARG*     2.6    64.1    +      -       -      +
    148L  ARG*     4.0     6.5    -      -       -      +
    150L  MSE      1.3    74.7    -      -       -      +
    152L  SER*     1.3    60.1    +      -       -      +
    154L  GLN*     4.1     1.4    +      -       -      +
    155L  ASN*     2.9    27.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with SER 152 (chain L). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    148L  ARG      3.2     6.8    +      -       -      -
    149L  ILE      3.7     2.9    -      -       -      -
    151L  ASP*     1.3    76.8    -      -       -      +
    153L  SER*     1.3    71.9    +      -       -      +
    155L  ASN*     3.2    17.4    -      -       -      +
    161L  THR*     4.0    19.4    -      -       -      +
    164L  LEU*     3.1    35.1    -      -       -      +
    176L  PHE*     3.3    22.9    -      -       -      -
    180L  GLN*     3.8     0.5    +      -       -      -
----------------------------------------------------------
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Residues in contact with SER 153 (chain L). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    159K  PHE*     3.4    19.7    -      -       -      -
    149L  ILE      2.8    23.2    +      -       -      -
    150L  MSE      3.0    12.3    +      -       -      -
    152L  SER*     1.3    73.5    -      -       -      +
    154L  GLN*     1.3    57.9    +      -       -      -
    155L  ASN      2.4    25.4    +      -       -      +
    176L  PHE*     3.4    18.9    -      -       -      -
    179L  GLY*     3.9    22.0    -      -       -      -
    180L  GLN*     3.0    22.7    +      -       -      +
    183L  LEU*     5.0     0.5    -      -       -      +
----------------------------------------------------------
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Residues in contact with GLN 154 (chain L). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    125K  ILE*     4.0    14.4    -      -       +      +
    128K  LEU*     5.7     0.4    -      -       -      +
    129K  ARG*     3.1    40.1    +      -       -      +
    155K  THR*     4.9     2.8    +      -       -      +
    156K  SER*     2.5    41.8    +      -       -      +
    159K  PHE*     5.7     5.9    -      -       +      +
    150L  MSE      3.4    17.8    +      -       +      +
    151L  ASP      4.3     0.7    -      -       -      +
    153L  SER*     1.3    79.6    -      -       -      +
    155L  ASN*     1.3    56.0    +      -       -      +
    156L  ALA      4.0     0.9    +      -       -      -
    179L  GLY*     3.9    20.1    +      -       -      +
    183L  LEU*     3.1    33.7    -      -       +      +
----------------------------------------------------------
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Residues in contact with ASN 155 (chain L). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    129K  ARG*     6.0     1.8    -      -       -      +
    151L  ASP      2.9    23.5    +      -       -      +
    152L  SER*     3.2    14.5    -      -       -      +
    153L  SER      2.4    29.3    +      -       -      +
    154L  GLN*     1.3    70.2    -      -       -      +
    156L  ALA*     1.3    90.0    +      -       -      +
    157L  TYR*     3.4     2.6    +      -       -      -
    158L  ASN*     4.0     9.7    +      -       -      -
    161L  THR*     5.2     2.1    -      -       +      +
    180L  GLN*     4.0     5.5    +      -       -      +
    183L  LEU*     5.3     2.2    -      -       -      +
----------------------------------------------------------
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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