Contacts of the helix formed by residues 22 - 52 (chain C) in PDB entry 1ZLL


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 GLN 22 (chain C).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     18C  ILE*     6.2     0.2    -      -       -      +
     20C  MET*     2.7    19.7    +      -       -      +
     21C  PRO*     1.3    69.1    -      -       -      +
     23C  GLN*     1.3    59.1    +      -       +      +
     24C  ALA      2.9     0.7    -      -       -      -
     25C  ARG*     2.5    45.9    +      -       -      +
     26C  GLN*     3.4     3.5    +      -       -      -
----------------------------------------------------------
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Residues in contact with GLN 23 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     21C  PRO*     2.3    27.0    +      -       +      +
     22C  GLN*     1.3    72.6    -      -       +      +
     24C  ALA*     1.3    60.2    +      -       -      +
     26C  GLN*     3.6     9.5    +      -       -      +
     27C  LYS*     3.0    38.0    +      -       -      +
     14D  ARG*     3.6    23.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 24 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     20C  MET*     4.9     5.6    -      -       +      -
     21C  PRO*     3.9    28.3    +      -       +      +
     22C  GLN      2.6     5.7    +      -       -      -
     23C  GLN*     1.3    74.4    -      -       -      +
     25C  ARG*     1.3    59.4    +      -       -      +
     27C  LYS*     4.2    15.0    -      -       +      +
     28C  LEU*     2.7    51.1    +      -       +      +
----------------------------------------------------------
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Residues in contact with ARG 25 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     18C  ILE*     6.6     0.2    -      -       -      -
     20C  MET*     3.5    34.7    -      -       +      +
     22C  GLN*     2.5    31.7    +      -       -      +
     24C  ALA*     1.3    74.4    -      -       -      +
     26C  GLN*     1.3    70.6    +      -       -      +
     28C  LEU*     3.6    18.7    -      -       -      +
     29C  GLN*     2.5    61.3    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLN 26 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     22C  GLN      3.4     5.2    +      -       -      +
     23C  GLN*     4.2    11.0    -      -       -      +
     24C  ALA      3.4     0.4    -      -       -      -
     25C  ARG*     1.3    88.6    -      -       -      +
     27C  LYS*     1.3    64.6    +      -       -      +
     28C  LEU      3.1     0.7    +      -       -      -
     29C  GLN*     3.3    12.6    +      -       -      +
     30C  ASN*     3.3    29.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 27 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     23C  GLN*     3.0    26.6    +      -       -      +
     24C  ALA*     3.9    15.8    -      -       +      +
     26C  GLN*     1.3    76.7    -      -       -      +
     28C  LEU*     1.3    69.4    +      -       +      +
     30C  ASN*     5.2     2.5    -      -       -      -
     31C  LEU*     2.8    59.9    +      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 28 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     20C  MET*     5.5     5.8    -      -       +      -
     24C  ALA*     2.7    46.1    +      -       +      +
     25C  ARG*     3.6    17.3    -      -       -      +
     27C  LYS*     1.3    80.9    -      -       +      +
     29C  GLN*     1.3    61.8    +      -       -      +
     31C  LEU*     4.5     2.2    -      -       +      -
     32C  PHE*     2.6    42.8    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLN 29 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     30B  ASN*     5.8     1.6    +      -       -      -
     34B  ASN*     4.3    23.2    +      -       -      +
     25C  ARG*     2.5    54.7    +      -       +      +
     26C  GLN*     3.3     6.3    +      -       -      +
     28C  LEU*     1.3    78.6    -      -       -      +
     30C  ASN*     1.3    69.7    +      -       -      +
     32C  PHE*     3.7     8.0    -      -       -      +
     33C  ILE*     3.2    31.1    +      -       +      +
----------------------------------------------------------
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Residues in contact with ASN 30 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     26C  GLN*     3.3    26.7    +      -       -      +
     27C  LYS*     4.3     2.4    -      -       -      +
     28C  LEU      3.3     0.4    -      -       -      -
     29C  GLN*     1.3    81.6    +      -       -      +
     31C  LEU*     1.3    69.2    +      -       +      +
     32C  PHE      3.0     0.7    +      -       -      -
     33C  ILE*     3.2    12.7    +      -       -      +
     34C  ASN*     3.2    32.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 31 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     27C  LYS*     2.8    55.1    +      -       +      +
     28C  LEU*     4.3     3.6    -      -       +      +
     30C  ASN*     1.3    75.0    -      -       +      +
     32C  PHE*     1.3    62.0    +      -       -      +
     34C  ASN*     3.6    10.5    +      -       +      +
     35C  PHE*     2.9    24.9    +      -       -      +
     29D  GLN*     6.0     2.5    -      -       -      +
----------------------------------------------------------
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Residues in contact with PHE 32 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     34B  ASN*     5.3     0.9    -      -       -      -
     37B  LEU*     4.4     9.2    -      -       +      -
     38B  ILE*     3.8    40.8    -      -       +      -
     41B  CYS*     4.9     5.6    -      -       +      -
     28C  LEU*     2.6    35.2    +      -       +      +
     29C  GLN*     3.7     9.4    -      -       -      +
     31C  LEU*     1.3    72.8    -      -       -      +
     33C  ILE*     1.3    72.8    +      -       +      +
     35C  PHE*     2.6    28.1    +      +       +      +
     36C  CYS*     2.7    44.5    +      -       -      -
----------------------------------------------------------
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Residues in contact with ILE 33 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     34B  ASN*     4.7    16.2    -      -       -      +
     37B  LEU*     5.3    14.6    -      -       +      -
     29C  GLN*     3.2    21.5    +      -       +      +
     30C  ASN*     3.7    12.8    -      -       -      +
     32C  PHE*     1.3    84.2    -      -       +      +
     34C  ASN*     1.3    73.4    +      -       -      +
     36C  CYS*     2.8    23.6    +      -       -      +
     37C  LEU*     3.1    23.1    +      -       +      +
----------------------------------------------------------
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Residues in contact with ASN 34 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     30C  ASN*     3.2    21.5    +      -       -      +
     31C  LEU*     3.9    12.4    -      -       +      +
     32C  PHE      3.2     0.6    -      -       -      -
     33C  ILE*     1.3    87.1    -      -       -      +
     35C  PHE*     1.3    63.9    +      -       -      +
     36C  CYS      3.2     0.3    +      -       -      -
     37C  LEU*     3.3    14.7    +      -       -      +
     38C  ILE*     3.3    22.6    +      -       +      +
     29D  GLN*     3.6    30.8    +      -       -      +
     32D  PHE*     5.3     0.5    -      -       -      -
     33D  ILE*     5.4    14.3    -      -       +      +
----------------------------------------------------------
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Residues in contact with PHE 35 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     31C  LEU      2.9    15.9    +      -       -      +
     32C  PHE*     2.6    30.5    +      +       +      +
     34C  ASN*     1.3    73.6    -      -       -      +
     36C  CYS*     1.3    55.4    +      -       -      +
     38C  ILE*     3.4    13.4    +      -       +      +
     39C  LEU*     2.8    56.1    +      -       +      +
----------------------------------------------------------
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Residues in contact with CYS 36 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     37B  LEU*     4.1    24.2    -      -       +      -
     41B  CYS*     4.6     8.5    -      -       -      -
     32C  PHE*     2.7    77.5    +      -       -      -
     33C  ILE*     2.8    10.0    +      -       -      +
     35C  PHE*     1.3    71.3    -      -       -      +
     37C  LEU*     1.3    66.8    +      -       -      +
     39C  LEU*     2.9     8.8    +      -       -      +
     40C  ILE*     2.8    34.1    +      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 37 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     37B  LEU*     4.9     9.6    -      -       +      -
     33C  ILE*     3.1    23.9    +      -       +      +
     34C  ASN*     3.3    11.2    +      -       -      +
     36C  CYS*     1.3    79.7    -      -       +      +
     38C  ILE*     1.3    56.0    +      -       -      +
     40C  ILE*     3.4    12.2    +      -       +      +
     41C  CYS*     2.5    35.6    +      -       -      -
     32D  PHE*     4.8    12.3    -      -       +      -
     33D  ILE*     5.2    17.3    -      -       +      -
     36D  CYS*     4.5    18.4    -      -       +      -
     37D  LEU*     5.1     9.6    -      -       +      -
     40D  ILE*     4.8    11.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with ILE 38 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     34C  ASN*     3.3    18.6    +      -       +      +
     35C  PHE*     3.8    13.7    -      -       +      +
     36C  CYS      3.2     0.4    -      -       -      -
     37C  LEU*     1.3    75.8    -      -       -      +
     39C  LEU*     1.3    63.7    +      -       -      +
     41C  CYS*     3.3     8.8    +      -       +      +
     42C  LEU*     3.1    39.5    +      -       +      +
     32D  PHE*     3.7    31.6    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 39 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     41B  CYS*     4.3    28.3    -      -       +      -
     45B  ILE*     5.3     9.4    -      -       +      -
     35C  PHE*     2.8    43.8    +      -       +      +
     36C  CYS*     2.9     6.5    +      -       -      +
     38C  ILE*     1.3    78.0    -      -       -      +
     40C  ILE*     1.3    64.9    +      -       +      +
     42C  LEU*     3.5     3.2    +      -       -      -
     43C  LEU*     3.0    56.1    +      -       +      +
----------------------------------------------------------
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Residues in contact with ILE 40 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     37B  LEU*     4.7    12.8    -      -       +      -
     40B  ILE*     4.9    11.2    -      -       +      -
     41B  CYS*     4.7    15.0    -      -       -      -
     44B  LEU*     3.8    26.7    -      -       +      -
     36C  CYS*     2.8    37.6    +      -       +      +
     37C  LEU*     3.9    12.8    -      -       +      +
     39C  LEU*     1.3    73.4    -      -       +      +
     41C  CYS*     1.3    64.8    +      -       -      +
     43C  LEU*     3.2    12.1    -      -       +      +
     44C  LEU*     3.0    30.6    +      -       +      +
     40D  ILE*     5.3    10.8    -      -       +      -
----------------------------------------------------------
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Residues in contact with CYS 41 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     37C  LEU*     2.5    32.1    +      -       -      -
     38C  ILE*     3.5    10.5    -      -       +      +
     39C  LEU      3.1     0.4    -      -       -      -
     40C  ILE*     1.3    72.2    -      -       -      +
     42C  LEU*     1.3    67.6    +      -       +      +
     43C  LEU      2.6     5.5    +      -       -      -
     44C  LEU*     3.0    16.6    +      -       -      +
     45C  ILE*     3.1    18.2    +      -       +      +
     32D  PHE*     5.1     4.0    -      -       +      -
     36D  CYS*     4.6    15.7    -      -       -      -
     39D  LEU*     4.4    20.2    -      -       +      -
     40D  ILE*     4.4    26.2    -      -       -      -
     43D  LEU*     5.4     0.8    -      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 42 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     38C  ILE*     3.1    29.7    +      -       +      +
     39C  LEU*     4.1     4.7    -      -       -      +
     41C  CYS*     1.3    80.4    -      -       +      +
     43C  LEU*     1.3    68.7    +      -       +      +
     45C  ILE*     3.6    17.4    +      -       +      +
     46C  CYS*     3.1    18.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 43 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     41B  CYS*     5.1     2.0    -      -       -      +
     44B  LEU*     4.0    28.3    -      -       +      -
     45B  ILE*     4.8    12.1    -      -       +      -
     48B  ILE*     3.9    19.3    -      -       +      -
     39C  LEU*     3.0    52.0    +      -       +      +
     40C  ILE*     3.2    14.8    -      -       +      +
     41C  CYS      2.6     5.3    +      -       -      -
     42C  LEU*     1.3    76.7    -      -       +      +
     44C  LEU*     1.3    68.9    +      -       -      +
     46C  CYS*     2.7    34.1    +      -       +      -
     47C  ILE*     3.2     2.2    +      -       -      -
----------------------------------------------------------
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Residues in contact with LEU 44 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     44B  LEU*     4.7    11.9    -      -       +      +
     40C  ILE*     3.0    17.0    +      -       +      +
     41C  CYS*     3.0     7.9    +      -       -      +
     43C  LEU*     1.3    77.2    -      -       -      +
     45C  ILE*     1.3    63.3    +      -       -      +
     47C  ILE*     3.3    22.5    +      -       +      +
     48C  ILE*     3.0    29.1    +      -       +      +
     40D  ILE*     3.9    37.2    -      -       +      +
     43D  LEU*     4.7    13.7    -      -       +      -
     44D  LEU*     4.6    16.2    -      -       +      -
     47D  ILE*     4.4    20.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with ILE 45 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     41C  CYS*     3.1    17.1    +      -       +      +
     42C  LEU*     3.6    20.6    -      -       +      +
     43C  LEU      2.8     0.8    +      -       -      -
     44C  LEU*     1.3    76.8    -      -       -      +
     46C  CYS*     1.3    65.5    +      -       -      +
     48C  ILE*     3.1    12.1    +      -       +      +
     49C  VAL*     2.9    34.1    +      -       +      +
     39D  LEU*     5.3    10.5    -      -       +      -
     43D  LEU*     4.6    16.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with CYS 46 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     48B  ILE*     3.5    32.3    -      -       +      -
     42C  LEU      3.1     9.5    +      -       -      +
     43C  LEU*     2.7    24.7    +      -       +      +
     45C  ILE*     1.3    74.7    -      -       -      +
     47C  ILE*     1.3   100.4    +      -       -      +
     49C  VAL*     2.9    19.2    +      -       -      +
     50C  MET*     3.1    12.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 47 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     44B  LEU*     3.9    28.9    -      -       +      +
     47B  ILE*     5.5    11.2    -      -       +      -
     48B  ILE*     4.0    13.5    -      -       +      -
     51B  LEU*     3.4    30.3    -      -       +      -
     43C  LEU      3.3     6.7    -      -       -      +
     44C  LEU*     3.6    20.4    -      -       +      +
     46C  CYS*     1.3   100.1    -      -       -      +
     48C  ILE*     1.3    65.3    +      -       +      +
     50C  MET*     2.9    18.2    +      -       -      +
     51C  LEU*     3.1    21.0    +      -       +      +
     47D  ILE*     6.2     1.8    -      -       +      -
----------------------------------------------------------
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Residues in contact with ILE 48 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     44C  LEU*     3.0    21.0    +      -       +      +
     45C  ILE*     3.4    12.3    -      -       +      +
     47C  ILE*     1.3    77.5    -      -       -      +
     49C  VAL*     1.3    68.4    +      -       +      +
     50C  MET      2.8     1.6    +      -       -      -
     51C  LEU*     2.8    21.1    +      -       +      +
     52C  LEU*     3.2    26.8    +      -       +      +
     43D  LEU*     4.3    27.4    -      -       +      +
     46D  CYS*     5.1     7.9    -      -       +      -
     47D  ILE*     3.8    41.5    -      -       +      +
     50D  MET*     5.8     3.4    -      -       -      -
----------------------------------------------------------
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Residues in contact with VAL 49 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     45C  ILE*     2.9    29.5    +      -       +      +
     46C  CYS*     3.4    11.0    -      -       -      +
     48C  ILE*     1.3    79.6    -      -       +      +
     50C  MET*     1.3    61.6    +      -       +      +
     52C  LEU*     3.7    30.1    -      -       +      +
----------------------------------------------------------
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Residues in contact with MET 50 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     51B  LEU*     4.3    34.1    -      -       +      +
     52B  LEU*     4.6    19.3    -      -       +      -
     46C  CYS      3.1     9.0    +      -       -      +
     47C  ILE*     2.9    14.3    +      -       -      +
     48C  ILE      2.8     2.0    +      -       -      -
     49C  VAL*     1.3    79.7    -      -       +      +
     51C  LEU*     1.3    69.8    +      -       +      +
     52C  LEU      3.4     3.3    +      -       -      -
----------------------------------------------------------
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Residues in contact with LEU 51 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     51B  LEU*     4.2    20.4    -      -       +      -
     47C  ILE*     3.5    21.1    -      -       +      +
     48C  ILE*     2.8    10.1    +      -       +      +
     50C  MET*     1.3    79.2    -      -       +      +
     52C  LEU*     1.3    70.0    +      -       +      +
     47D  ILE*     3.9    27.4    -      -       +      -
     50D  MET*     5.3    10.0    -      -       +      +
     51D  LEU*     4.6    16.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 52 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     48C  ILE*     3.2    26.8    +      -       +      +
     49C  VAL*     3.7    31.0    -      -       +      +
     50C  MET      3.2     4.8    -      -       -      -
     51C  LEU*     1.3    84.0    -      -       -      +
     50D  MET*     3.8    33.9    -      -       +      -
----------------------------------------------------------
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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