Contacts of the helix formed by residues 22 - 52 (chain E) 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 E).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     20E  MET*     2.7    16.6    +      -       -      +
     21E  PRO*     1.3    70.8    -      -       -      +
     23E  GLN*     1.3    60.7    +      -       +      +
     24E  ALA      2.9     0.7    -      -       -      -
     25E  ARG*     2.5    46.0    +      -       -      +
     26E  GLN*     3.4    23.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLN 23 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     14A  ARG*     4.0    24.8    +      -       -      +
     21E  PRO*     2.3    29.5    +      -       +      +
     22E  GLN*     1.3    73.0    -      -       +      +
     24E  ALA*     1.3    61.5    +      -       -      +
     26E  GLN*     3.6     5.8    +      -       -      +
     27E  LYS*     3.0    30.1    +      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 24 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     20E  MET*     4.9     5.6    -      -       +      -
     21E  PRO*     3.9    27.5    +      -       +      +
     22E  GLN      2.6     5.5    +      -       -      -
     23E  GLN*     1.3    74.2    -      -       -      +
     25E  ARG*     1.3    65.2    +      -       -      +
     27E  LYS*     4.0    19.5    -      -       -      +
     28E  LEU*     2.7    44.1    +      -       +      +
----------------------------------------------------------
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Residues in contact with ARG 25 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     31D  LEU*     5.2    11.7    -      -       -      +
     20E  MET*     3.5    33.7    -      -       +      +
     22E  GLN*     2.5    27.8    +      -       -      +
     24E  ALA*     1.3    76.5    -      -       -      +
     26E  GLN*     1.3    74.4    +      -       +      +
     28E  LEU*     3.8     4.3    -      -       -      +
     29E  GLN*     3.2    54.8    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLN 26 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     22E  GLN*     3.4    28.8    +      -       -      +
     23E  GLN*     4.2     7.0    -      -       -      +
     24E  ALA      3.4     0.2    -      -       -      -
     25E  ARG*     1.3    88.1    -      -       +      +
     27E  LYS*     1.3    64.3    +      -       -      +
     28E  LEU      3.1     1.0    +      -       -      -
     29E  GLN*     3.3    12.0    +      -       +      +
     30E  ASN*     3.3    14.6    +      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 27 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     23E  GLN*     3.0    14.4    +      -       +      +
     24E  ALA*     3.6    23.9    -      -       -      +
     26E  GLN*     1.3    78.2    -      -       -      +
     28E  LEU*     1.3    76.0    +      -       -      +
     30E  ASN*     5.2     2.0    -      -       -      -
     31E  LEU*     2.8    59.2    +      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 28 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     20E  MET*     5.4     7.9    -      -       +      -
     24E  ALA*     2.7    42.3    +      -       +      +
     25E  ARG*     3.8     7.0    -      -       -      +
     27E  LYS*     1.3    90.3    -      -       +      +
     29E  GLN*     1.3    60.3    +      -       +      +
     31E  LEU*     4.5     3.1    -      -       +      -
     32E  PHE*     2.6    45.7    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLN 29 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     30D  ASN*     4.1    13.5    +      -       -      +
     31D  LEU*     5.8     3.3    -      -       -      +
     34D  ASN*     4.8    21.4    +      -       -      +
     25E  ARG*     3.2    58.0    +      -       +      +
     26E  GLN*     4.0     5.2    -      -       +      +
     28E  LEU*     1.3    77.2    -      -       +      +
     30E  ASN*     1.3    62.8    +      -       -      +
     32E  PHE*     3.7     5.7    -      -       -      +
     33E  ILE*     3.2    31.5    +      -       +      +
----------------------------------------------------------
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Residues in contact with ASN 30 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     26E  GLN      3.3    11.7    +      -       -      +
     27E  LYS*     4.3     1.6    -      -       -      +
     28E  LEU      3.3     0.2    -      -       -      -
     29E  GLN*     1.3    76.1    -      -       -      +
     31E  LEU*     1.3    77.2    +      -       +      +
     32E  PHE      3.0     0.9    +      -       -      -
     33E  ILE*     3.2    13.3    +      -       -      +
     34E  ASN*     3.1    37.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 31 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     27E  LYS*     2.8    58.6    +      -       +      +
     28E  LEU*     4.3     4.7    -      -       +      +
     30E  ASN*     1.3    83.1    +      -       +      +
     32E  PHE*     1.3    61.5    +      -       -      +
     34E  ASN*     3.6     6.9    +      -       +      +
     35E  PHE*     2.9    24.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with PHE 32 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     34D  ASN*     4.8    10.3    -      -       +      -
     37D  LEU*     4.7     6.7    -      -       +      -
     38D  ILE*     3.5    40.6    -      -       +      -
     41D  CYS*     6.2     1.6    -      -       -      -
     28E  LEU*     2.6    36.2    +      -       +      +
     29E  GLN*     3.7     6.1    -      -       -      +
     31E  LEU*     1.3    73.4    -      -       -      +
     33E  ILE*     1.3    71.4    +      -       +      +
     35E  PHE*     2.6    27.1    +      +       +      +
     36E  CYS*     2.7    45.1    +      -       -      -
----------------------------------------------------------
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Residues in contact with ILE 33 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     33A  ILE*     6.4     0.9    -      -       +      -
     33D  ILE*     6.0     5.2    -      -       +      -
     34D  ASN*     5.7     6.7    -      -       +      -
     37D  LEU*     4.1    21.1    -      -       +      -
     29E  GLN*     3.2    19.5    +      -       +      +
     30E  ASN*     3.2    11.8    +      -       -      +
     32E  PHE*     1.3    80.4    -      -       +      +
     34E  ASN*     1.3    75.2    +      -       -      +
     36E  CYS*     2.8    22.7    +      -       -      +
     37E  LEU*     3.1    23.8    +      -       +      +
----------------------------------------------------------
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Residues in contact with ASN 34 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     29A  GLN*     4.6    16.5    -      -       -      +
     32A  PHE*     5.2     2.8    -      -       +      -
     33A  ILE*     4.7    19.5    -      -       -      +
     30E  ASN*     3.1    32.0    +      -       -      +
     31E  LEU*     3.9     9.9    -      -       +      +
     32E  PHE      3.2     0.8    -      -       -      -
     33E  ILE*     1.3    85.7    -      -       -      +
     35E  PHE*     1.3    63.9    +      -       -      +
     36E  CYS      3.2     0.3    +      -       -      -
     37E  LEU*     3.3    12.8    +      -       +      +
     38E  ILE*     3.3    28.8    +      -       +      +
----------------------------------------------------------
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Residues in contact with PHE 35 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     31E  LEU      2.9    15.9    +      -       -      +
     32E  PHE*     2.6    30.3    +      +       +      +
     34E  ASN*     1.3    73.6    -      -       -      +
     36E  CYS*     1.3    55.8    +      -       -      -
     38E  ILE*     3.4    13.4    +      -       +      +
     39E  LEU*     2.8    53.0    +      -       +      -
----------------------------------------------------------
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Residues in contact with CYS 36 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     37D  LEU*     4.0    26.7    -      -       +      -
     41D  CYS*     5.3     4.0    -      -       -      -
     32E  PHE*     2.7    74.2    +      -       -      -
     33E  ILE*     2.8    10.2    +      -       -      +
     35E  PHE*     1.3    72.2    -      -       -      +
     37E  LEU*     1.3    68.8    +      -       +      +
     39E  LEU*     2.8    10.2    +      -       -      +
     40E  ILE*     2.8    34.1    +      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 37 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     32A  PHE*     4.7     3.1    -      -       +      -
     33A  ILE*     3.7    42.6    -      -       +      -
     36A  CYS*     4.6    19.5    -      -       +      -
     37A  LEU*     6.0     6.3    -      -       +      -
     40A  ILE*     5.3     5.8    -      -       +      +
     37D  LEU*     5.6     7.4    -      -       +      -
     33E  ILE*     3.1    21.5    +      -       +      +
     34E  ASN*     3.3    16.4    +      -       -      +
     36E  CYS*     1.3    80.6    -      -       +      +
     38E  ILE*     1.3    56.1    +      -       -      +
     40E  ILE*     3.4    12.8    +      -       +      +
     41E  CYS*     2.5    35.7    +      -       -      -
----------------------------------------------------------
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Residues in contact with ILE 38 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     32A  PHE*     3.6    33.2    -      -       +      -
     34E  ASN*     3.3    19.2    +      -       +      +
     35E  PHE*     3.8    12.1    -      -       +      +
     36E  CYS      3.2     0.6    -      -       -      -
     37E  LEU*     1.3    75.3    -      -       -      +
     39E  LEU*     1.3    63.1    +      -       -      +
     41E  CYS*     3.3     8.9    +      -       +      +
     42E  LEU*     3.1    40.1    +      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 39 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     41D  CYS*     3.8    36.6    -      -       +      -
     45D  ILE*     6.1     3.1    -      -       +      -
     35E  PHE*     2.8    43.4    +      -       +      +
     36E  CYS*     2.8     7.8    +      -       -      +
     38E  ILE*     1.3    78.8    -      -       -      +
     40E  ILE*     1.3    64.5    +      -       +      +
     42E  LEU*     3.5     3.7    +      -       -      +
     43E  LEU*     3.0    44.8    +      -       +      +
----------------------------------------------------------
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Residues in contact with ILE 40 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     40A  ILE*     5.2    10.8    -      -       +      -
     37D  LEU*     5.0    15.3    -      -       +      +
     40D  ILE*     4.8    12.1    -      -       +      -
     41D  CYS*     4.2    23.1    -      -       -      -
     44D  LEU*     4.4    19.3    -      -       +      -
     36E  CYS*     2.8    37.6    +      -       +      +
     37E  LEU*     3.9    11.7    -      -       +      +
     39E  LEU*     1.3    72.7    -      -       +      +
     41E  CYS*     1.3    65.9    +      -       -      +
     43E  LEU*     3.2     8.9    -      -       -      +
     44E  LEU*     3.1    36.1    +      -       +      +
----------------------------------------------------------
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Residues in contact with CYS 41 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     32A  PHE*     5.4     3.8    -      -       +      -
     36A  CYS*     4.8    10.1    -      -       -      -
     39A  LEU*     4.2    27.8    -      -       +      -
     40A  ILE*     4.4    18.8    -      -       -      -
     43A  LEU*     5.3     1.1    -      -       -      -
     37E  LEU      2.5    32.7    +      -       -      -
     38E  ILE*     3.5    11.2    -      -       +      +
     39E  LEU      3.1     0.2    -      -       -      -
     40E  ILE*     1.3    76.1    -      -       -      +
     42E  LEU*     1.3    68.3    +      -       +      +
     43E  LEU      2.7     4.8    +      -       -      -
     44E  LEU*     3.0    17.0    +      -       -      +
     45E  ILE*     3.1    18.7    +      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 42 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     38E  ILE*     3.1    31.6    +      -       +      +
     39E  LEU*     4.1     4.7    -      -       -      +
     41E  CYS*     1.3    79.1    -      -       +      +
     43E  LEU*     1.3    66.5    +      -       +      +
     45E  ILE*     3.6    17.6    +      -       +      +
     46E  CYS*     3.1    29.4    +      -       -      -
----------------------------------------------------------
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Residues in contact with LEU 43 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     41D  CYS*     5.8     1.1    -      -       -      +
     44D  LEU*     4.4    25.8    -      -       +      -
     45D  ILE*     4.6    15.7    -      -       +      -
     48D  ILE*     3.6    29.8    -      -       +      -
     39E  LEU*     3.0    43.3    +      -       +      +
     40E  ILE*     3.2    14.8    -      -       -      +
     41E  CYS      2.7     4.6    +      -       -      -
     42E  LEU*     1.3    74.2    -      -       +      +
     44E  LEU*     1.3    67.2    +      -       -      +
     46E  CYS*     2.7    28.7    +      -       +      +
     47E  ILE*     3.2     8.9    +      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 44 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     40A  ILE*     4.1    33.4    -      -       +      -
     43A  LEU*     4.2    21.8    -      -       +      -
     44A  LEU*     4.4    17.3    -      -       +      -
     47A  ILE*     5.2     9.7    -      -       +      +
     44D  LEU*     4.2    22.4    -      -       +      -
     40E  ILE*     3.4    27.8    -      -       +      +
     41E  CYS*     3.0     7.4    +      -       -      +
     43E  LEU*     1.3    76.7    -      -       +      +
     45E  ILE*     1.3    63.8    +      -       -      +
     47E  ILE*     3.4    13.8    +      -       +      +
     48E  ILE*     3.0    28.6    +      -       +      +
----------------------------------------------------------
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Residues in contact with ILE 45 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     39A  LEU*     5.6     4.9    -      -       +      -
     43A  LEU*     4.7    18.6    -      -       +      -
     41E  CYS*     3.1    18.4    +      -       +      +
     42E  LEU*     3.6    21.5    -      -       +      +
     43E  LEU      3.0     0.6    -      -       -      -
     44E  LEU*     1.3    77.0    -      -       -      +
     46E  CYS*     1.3    65.7    +      -       -      +
     48E  ILE*     3.1    11.5    +      -       +      +
     49E  VAL*     2.9    39.1    +      -       +      +
----------------------------------------------------------
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Residues in contact with CYS 46 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     48D  ILE*     4.7    11.9    -      -       +      -
     42E  LEU*     3.1    21.2    +      -       -      +
     43E  LEU*     2.7    22.0    +      -       +      +
     45E  ILE*     1.3    74.1    -      -       -      +
     47E  ILE*     1.3    66.0    +      -       -      +
     49E  VAL*     2.9    20.9    +      -       -      +
     50E  MET*     3.1    12.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 47 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     47A  ILE*     6.3     3.8    -      -       +      -
     44D  LEU*     4.2    28.0    -      -       +      +
     47D  ILE*     5.8     8.7    -      -       +      -
     48D  ILE*     3.8    34.5    -      -       +      +
     51D  LEU*     4.6    19.5    -      -       +      -
     43E  LEU      3.2    14.3    +      -       -      +
     44E  LEU*     3.6    20.4    -      -       +      +
     46E  CYS*     1.3    73.8    -      -       -      +
     48E  ILE*     1.3    66.3    +      -       +      +
     50E  MET*     2.9    18.8    +      -       +      +
     51E  LEU*     3.1    20.5    +      -       +      +
----------------------------------------------------------
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Residues in contact with ILE 48 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     43A  LEU*     3.4    34.3    -      -       +      +
     46A  CYS*     5.0     7.6    -      -       +      -
     47A  ILE*     4.2    35.0    -      -       +      -
     50A  MET*     5.0     6.7    -      -       +      -
     44E  LEU*     3.0    18.2    +      -       +      +
     45E  ILE*     3.4    10.3    -      -       +      +
     47E  ILE*     1.3    75.8    -      -       +      +
     49E  VAL*     1.3    68.8    +      -       +      +
     50E  MET      2.8     1.6    +      -       -      -
     51E  LEU*     2.8    20.1    +      -       -      +
     52E  LEU*     3.2    26.9    +      -       +      +
----------------------------------------------------------
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Residues in contact with VAL 49 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     45E  ILE*     2.9    34.0    +      -       +      +
     46E  CYS*     2.9    10.7    +      -       -      +
     48E  ILE*     1.3    77.5    -      -       +      +
     50E  MET*     1.3    60.3    +      -       +      +
     52E  LEU*     3.6    30.4    -      -       +      +
----------------------------------------------------------
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Residues in contact with MET 50 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     48D  ILE*     5.9     4.5    -      -       +      -
     51D  LEU*     5.5    16.8    -      -       +      +
     52D  LEU*     4.6    25.8    -      -       +      -
     46E  CYS      3.1     8.8    +      -       -      +
     47E  ILE*     2.9    14.4    +      -       -      +
     48E  ILE      2.8     1.6    +      -       -      -
     49E  VAL*     1.3    78.7    -      -       +      +
     51E  LEU*     1.3    69.5    +      -       +      +
     52E  LEU      3.4     3.5    +      -       -      -
----------------------------------------------------------
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Residues in contact with LEU 51 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     47A  ILE*     4.4    22.9    -      -       +      -
     50A  MET*     3.9    27.1    -      -       +      +
     51A  LEU*     6.0     7.0    -      -       +      -
     51D  LEU*     3.8    28.0    -      -       +      -
     47E  ILE*     3.5    20.2    -      -       +      +
     48E  ILE*     2.8    14.0    +      -       -      +
     50E  MET*     1.3    73.9    -      -       +      +
     52E  LEU*     1.3    69.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 52 (chain E). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     50A  MET*     4.1    23.6    -      -       +      -
     48E  ILE*     3.2    25.4    +      -       +      +
     49E  VAL*     3.6    33.4    -      -       +      +
     50E  MET      3.2     4.6    -      -       -      -
     51E  LEU*     1.3    84.5    -      -       -      +
----------------------------------------------------------
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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