Contacts of the helix formed by residues 16 - 44 (chain J) in PDB entry 1L0N


Residue contacts within the protein are derived with the CSU software (Sobolev V., Sorokine A., Prilusky J., Abola E.E. and Edelman M. (1999) Automated analysis of interatomic contacts in proteins. Bioinformatics, 15, 327-332). A short description of the analytical approach is given at the end of the page.
For CSU analysis of other PDB entry

Note:
Non-standard 3 letter residue codes indicate a heterogroup. To identify and analyse, use LPC software

Legend:
Dist - nearest distance (Å) between atoms of two residues
Surf - contact surface area (Å2) between two residues
HB   - hydrophilic-hydrophilic contact (hydrogen bond)
Arom - aromatic-aromatic contact
Phob - hydrophobic-hydrophobic contact
DC   - hydrophobic-hydrophilic contact (destabilizing contact)
+/-  - indicates presence/absence of a specific contacts
*    - indicates residues forming contacts  by their side chain
       (including CA atoms)
Residues in contact with ARG 16 (chain J).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    446A  PHE*     3.3    61.9    -      -       +      +
     14J  PHE      3.6     4.5    -      -       -      +
     15J  ARG*     1.3    80.6    -      -       -      +
     17J  THR*     1.3    61.8    +      -       -      +
     18J  SER*     3.8    19.5    -      -       -      +
     19J  THR*     3.3    19.7    +      -       +      +
     20J  PHE*     3.3    20.4    +      -       -      +
     19K  PRO*     4.6    15.8    -      -       -      +
     20K  THR*     4.3    11.3    +      -       -      +
     23K  LEU*     4.3    15.6    -      -       -      +
----------------------------------------------------------
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Residues in contact with THR 17 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    416A  TYR*     4.6     2.4    +      -       -      -
    442A  PHE*     4.6     6.8    -      -       -      -
    443A  TRP      3.3    12.1    +      -       -      -
    444A  LEU*     3.7    39.2    -      -       +      +
    446A  PHE*     2.9    27.8    +      -       -      -
     15J  ARG      4.2     0.6    +      -       -      -
     16J  ARG*     1.3    71.2    -      -       -      +
     18J  SER*     1.3    58.6    +      -       -      +
     20J  PHE*     3.4    14.3    -      -       +      +
     21J  ALA*     2.9    29.6    +      -       +      +
     24K  TRP*     3.6    10.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with SER 18 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    446A  PHE      3.3    13.1    +      -       -      -
     16J  ARG*     3.1    16.7    -      -       -      -
     17J  THR*     1.3    74.6    -      -       -      +
     19J  THR*     1.3    56.4    +      -       -      +
     21J  ALA*     3.0     5.0    +      -       -      +
     22J  LEU*     2.7    35.9    +      -       -      +
     20K  THR*     3.6    17.5    +      -       -      +
     23K  LEU*     4.0    20.4    -      -       -      -
     24K  TRP*     3.4    26.2    -      -       -      -
     27K  VAL*     3.9     3.2    -      -       -      +
----------------------------------------------------------
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Residues in contact with THR 19 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     12J  LEU      4.6    10.0    +      -       -      +
     13J  LEU*     2.9    36.0    +      -       +      -
     15J  ARG      4.7     0.2    +      -       -      -
     16J  ARG*     3.3    26.8    +      -       +      +
     18J  SER*     1.3    76.9    -      -       -      +
     20J  PHE*     1.3    52.7    +      -       -      +
     22J  LEU*     3.1    11.6    +      -       +      +
     23J  THR*     2.7    40.3    +      -       -      +
     23K  LEU*     3.8    23.8    -      -       +      -
----------------------------------------------------------
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Residues in contact with PHE 20 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     37E  TYR*     3.9    12.3    -      +       +      -
     40E  THR*     3.8    20.2    -      -       -      -
     41E  ALA*     3.7    22.7    -      -       +      -
     44E  THR*     5.9     2.2    -      -       +      -
     13J  LEU      3.2     4.7    +      -       -      +
     14J  PHE*     3.6    52.7    -      +       +      +
     16J  ARG      3.3    16.5    +      -       -      +
     17J  THR*     3.4    16.4    -      -       +      +
     19J  THR*     1.3    81.4    +      -       -      +
     21J  ALA*     1.3    63.8    +      -       -      +
     23J  THR*     3.2     5.2    +      -       -      -
     24J  ILE*     3.0    46.9    +      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 21 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     17J  THR*     2.9    22.6    +      -       +      +
     18J  SER      3.4     3.6    -      -       -      +
     20J  PHE*     1.3    73.0    -      -       -      +
     22J  LEU*     1.3    65.3    +      -       -      +
     24J  ILE*     3.2    10.8    +      -       -      +
     25J  VAL*     3.0    27.6    +      -       +      +
     24K  TRP*     4.2    13.2    -      -       +      -
     27K  VAL*     3.9    22.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 22 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     18J  SER      2.7    18.2    +      -       -      +
     19J  THR*     3.4    15.3    -      -       +      +
     21J  ALA*     1.3    73.7    -      -       -      +
     23J  THR*     1.3    63.3    +      -       +      +
     25J  VAL*     3.4     2.8    +      -       +      +
     26J  VAL*     3.0    31.3    +      -       +      +
     23K  LEU*     4.2    24.0    -      -       +      +
     26K  ALA*     4.1    13.0    -      -       +      +
     27K  VAL*     3.6    36.0    -      -       +      +
     30K  VAL*     4.5    13.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with THR 23 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     41E  ALA*     5.4     1.2    -      -       -      +
     13J  LEU*     3.5    43.1    -      -       +      +
     14J  PHE*     4.2    14.3    -      -       +      -
     19J  THR*     2.7    27.9    +      -       -      +
     20J  PHE*     3.4     5.7    +      -       -      -
     22J  LEU*     1.3    71.7    -      -       +      +
     24J  ILE*     1.3    62.7    +      -       -      +
     26J  VAL*     3.7     6.2    -      -       -      +
     27J  GLY*     2.5    36.4    +      -       -      -
----------------------------------------------------------
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Residues in contact with ILE 24 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     41E  ALA*     3.8    24.7    -      -       +      +
     44E  THR*     3.2    36.1    -      -       +      +
     45E  VAL*     3.9    17.4    -      -       +      +
     48E  ALA*     5.7     2.9    -      -       +      -
     20J  PHE*     3.0    46.0    +      -       +      +
     21J  ALA*     3.5    10.1    -      -       -      +
     23J  THR*     1.3    82.8    +      -       -      +
     25J  VAL*     1.3    58.1    +      -       +      +
     27J  GLY      3.2     1.0    +      -       -      -
     28J  ALA*     2.6    37.3    +      -       +      +
----------------------------------------------------------
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Residues in contact with VAL 25 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     52E  LYS*     6.1     1.1    -      -       -      +
     21J  ALA*     3.0    16.3    +      -       -      +
     22J  LEU*     3.9     4.9    -      -       -      +
     24J  ILE*     1.3    80.4    -      -       +      +
     26J  VAL*     1.3    61.8    +      -       -      +
     28J  ALA*     3.2    20.0    +      -       +      +
     29J  LEU*     3.3     9.4    +      -       -      +
     27K  VAL*     4.2    21.1    -      -       +      +
     30K  VAL*     3.7    14.4    -      -       +      +
     31K  GLY*     3.6    35.2    -      -       -      +
     34K  SER*     4.9     5.1    +      -       -      -
----------------------------------------------------------
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Residues in contact with VAL 26 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     22J  LEU*     3.0    33.1    +      -       +      +
     23J  THR*     3.7     5.8    -      -       -      +
     25J  VAL*     1.3    75.0    -      -       -      +
     27J  GLY*     1.3    64.0    +      -       -      +
     29J  LEU*     3.2    16.3    +      -       +      +
     30J  PHE*     3.3    36.0    -      -       +      -
     30K  VAL*     4.2    20.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLY 27 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     45E  VAL*     3.6    10.9    -      -       -      +
     23J  THR      2.5    22.4    +      -       -      -
     24J  ILE*     3.4     2.7    -      -       -      -
     26J  VAL*     1.3    75.0    -      -       -      +
     28J  ALA*     1.3    60.3    +      -       -      +
     30J  PHE*     4.4     4.5    -      -       -      +
     31J  PHE*     3.1    26.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 28 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     45E  VAL*     3.7    14.6    -      -       +      +
     48E  ALA*     4.5    18.6    -      -       +      -
     49E  TYR*     6.1     0.2    -      -       -      +
     52E  LYS*     5.3     6.7    -      -       -      +
     24J  ILE*     2.6    21.7    +      -       +      +
     25J  VAL*     3.3    13.5    -      -       +      +
     26J  VAL      3.2     0.2    -      -       -      -
     27J  GLY*     1.3    72.6    -      -       -      +
     29J  LEU*     1.3    66.9    +      -       -      +
     31J  PHE*     3.7     2.3    -      -       -      +
     32J  GLU*     3.0    21.9    +      -       -      +
     34K  SER*     4.9     4.7    -      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 29 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     25J  VAL      3.3     4.9    +      -       -      +
     26J  VAL*     3.2    12.7    +      -       +      +
     28J  ALA*     1.3    77.0    -      -       -      +
     30J  PHE*     1.3    77.5    +      -       +      +
     32J  GLU*     2.9    25.0    +      -       -      +
     33J  ARG*     3.0    13.1    +      -       -      +
     30K  VAL*     5.0    12.8    -      -       +      -
     33K  VAL*     5.8     6.7    -      -       +      -
     34K  SER*     3.4    38.7    +      -       -      +
     37K  ASP*     5.9     1.3    -      -       -      +
     47K  THR*     5.5    16.2    -      -       +      +
----------------------------------------------------------
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Residues in contact with PHE 30 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     26J  VAL*     3.3    41.8    +      -       +      +
     27J  GLY*     4.5     3.8    -      -       -      +
     29J  LEU*     1.3    89.8    -      -       +      +
     31J  PHE*     1.3    66.0    +      -       -      +
     33J  ARG*     2.9    33.2    +      -       -      +
     34J  ALA*     2.7    26.0    +      -       +      +
     46K  PRO*     4.9    21.5    -      -       +      -
     47K  THR*     5.2     7.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with PHE 31 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    211D  MET*     3.4    42.4    -      -       +      -
    214D  LEU*     5.4    10.8    -      -       +      -
     45E  VAL*     3.9    18.4    -      -       +      -
     46E  GLY*     5.1     5.2    -      -       -      -
     49E  TYR*     4.0    22.9    -      +       +      -
     27J  GLY      3.1    20.7    +      -       -      +
     28J  ALA      3.7     4.3    -      -       -      +
     29J  LEU      3.2     0.2    -      -       -      -
     30J  PHE*     1.3    76.9    -      -       -      +
     32J  GLU*     1.3    57.0    +      -       -      +
     34J  ALA*     3.7     5.7    -      -       +      +
     35J  PHE*     2.7    60.0    +      +       +      +
----------------------------------------------------------
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Residues in contact with GLU 32 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     49E  TYR*     4.1    26.7    -      -       +      -
     52E  LYS*     4.9    13.1    +      -       -      +
     53E  ASN*     4.1    17.9    +      -       -      -
     28J  ALA      3.0    12.8    +      -       -      +
     29J  LEU*     2.9    15.8    +      -       -      +
     31J  PHE*     1.3    75.2    -      -       -      +
     33J  ARG*     1.3    58.9    +      -       -      +
     36J  ASP*     2.8    53.5    +      -       +      +
     34K  SER*     4.6    17.0    +      -       -      +
     37K  ASP*     4.8     9.8    -      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 33 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     29J  LEU*     3.0     9.1    +      -       +      +
     30J  PHE*     2.9    25.7    +      -       -      +
     32J  GLU*     1.3    77.8    -      -       -      +
     34J  ALA*     1.3    69.4    +      -       -      +
     36J  ASP*     4.6     1.7    -      -       -      +
     37J  GLN*     3.3    42.0    +      -       -      +
     46K  PRO*     3.1    36.4    +      -       -      +
     47K  THR*     3.8    30.4    -      -       +      +
     48K  ILE*     6.5     1.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 34 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     30J  PHE*     2.7    20.7    +      -       +      +
     31J  PHE*     3.7     6.3    -      -       +      +
     33J  ARG*     1.3    82.5    -      -       -      +
     35J  PHE*     1.3    58.7    +      -       -      +
     37J  GLN*     3.7     8.3    +      -       -      +
     38J  GLY*     2.8    25.3    +      -       -      -
----------------------------------------------------------
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Residues in contact with PHE 35 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    207D  LYS*     3.8    19.1    -      -       +      -
    210D  LEU*     3.6    46.4    -      -       +      -
    211D  MET*     3.7    30.3    -      -       +      -
     49E  TYR*     3.6    27.8    -      +       +      -
     31J  PHE*     2.7    49.2    +      +       +      +
     32J  GLU      4.2     0.2    -      -       -      +
     34J  ALA*     1.3    70.2    -      -       -      +
     36J  ASP*     1.3    61.4    +      -       -      +
     37J  GLN      3.0     2.2    -      -       -      -
     38J  GLY*     2.8     2.1    +      -       -      +
     39J  ALA*     2.6    37.3    +      -       +      +
----------------------------------------------------------
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Residues in contact with ASP 36 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    207D  LYS*     2.6    39.4    +      -       -      +
     49E  TYR*     3.4    17.7    +      -       +      +
     53E  ASN*     4.8     5.8    +      -       -      +
     32J  GLU*     2.8    40.6    +      -       +      +
     33J  ARG*     4.6     1.6    -      -       -      +
     35J  PHE*     1.3    74.2    -      -       -      +
     37J  GLN*     1.3    51.0    +      -       -      +
     40J  ASP*     2.8    43.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLN 37 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     33J  ARG*     3.3    36.1    +      -       -      +
     34J  ALA*     3.7     9.8    +      -       -      +
     35J  PHE      3.0     0.2    -      -       -      -
     36J  ASP*     1.3    79.7    -      -       -      +
     38J  GLY*     1.3    59.8    +      -       -      +
     40J  ASP*     3.1     8.5    +      -       -      +
     41J  ALA*     2.6    40.8    +      -       +      +
     48K  ILE*     5.7     5.2    -      -       -      +
----------------------------------------------------------
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Residues in contact with GLY 38 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     34J  ALA      2.8    16.9    +      -       -      -
     35J  PHE*     2.8     7.5    +      -       -      -
     37J  GLN*     1.3    79.4    -      -       -      +
     39J  ALA*     1.3    50.7    +      -       -      -
     41J  ALA*     3.3     5.6    +      -       -      +
     42J  ILE*     2.7    43.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 39 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    203D  ARG*     5.6     0.8    -      -       -      +
    206D  LEU*     3.4    12.0    -      -       +      +
    207D  LYS*     3.5    33.9    -      -       +      -
    210D  LEU*     4.1    21.5    -      -       +      -
     35J  PHE*     2.6    25.5    +      -       +      +
     38J  GLY*     1.3    70.4    -      -       -      -
     40J  ASP*     1.4    64.5    +      -       -      +
     42J  ILE*     4.5     2.5    -      -       -      +
     43J  TYR*     3.0    24.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASP 40 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    203D  ARG*     3.1    40.6    +      -       -      +
    207D  LYS*     2.6    28.1    +      -       -      -
     36J  ASP*     2.8    24.6    +      -       -      +
     37J  GLN*     3.1     9.3    +      -       -      +
     39J  ALA*     1.4    74.4    -      -       -      +
     41J  ALA*     1.3    65.4    +      -       -      +
     43J  TYR*     3.1    14.6    -      -       -      +
     44J  GLU*     3.4     5.0    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 41 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     37J  GLN*     2.6    25.6    +      -       +      +
     38J  GLY*     3.4     8.5    -      -       -      +
     40J  ASP*     1.3    69.7    -      -       -      +
     42J  ILE*     1.3    55.8    +      -       +      +
     44J  GLU*     2.5    55.4    +      -       +      +
----------------------------------------------------------
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Residues in contact with ILE 42 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    206D  LEU*     4.7    14.6    -      -       +      -
    210D  LEU*     5.1    17.7    -      -       +      -
     38J  GLY      2.7    25.9    +      -       -      +
     39J  ALA*     4.1     7.4    -      -       -      +
     41J  ALA*     1.3    70.2    -      -       +      +
     43J  TYR*     1.3    65.8    +      -       -      +
     44J  GLU*     2.8     3.0    +      -       -      -
     45J  HIS*     3.0    26.2    +      -       +      +
----------------------------------------------------------
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Residues in contact with TYR 43 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     18D  LEU*     5.0    13.5    -      -       +      -
     19D  SER      5.4     0.2    -      -       -      -
     20D  SER*     4.1    30.7    +      -       -      -
    199D  ASP*     3.3    29.4    +      -       +      +
    202D  LYS*     4.0    12.8    -      -       +      +
    203D  ARG*     3.6    55.1    +      -       +      +
    206D  LEU*     4.2    16.5    -      -       +      +
     39J  ALA      3.0    14.3    +      -       -      +
     40J  ASP*     3.1    17.3    -      -       -      +
     42J  ILE*     1.3    77.5    -      -       -      +
     44J  GLU*     1.4    54.2    +      -       -      +
     45J  HIS      2.9     7.7    +      -       -      -
     46J  ILE*     3.0    30.1    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLU 44 (chain J). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     40J  ASP      3.4     4.5    +      -       -      +
     41J  ALA*     2.5    50.0    +      -       -      +
     42J  ILE      4.5     0.7    -      -       -      +
     43J  TYR*     1.4    64.6    -      -       -      +
     45J  HIS*     1.3    68.4    +      -       +      +
     46J  ILE*     3.0    13.6    +      -       -      +
     47J  ASN*     3.3    19.6    +      -       -      +
     50J  LYS*     3.9    29.9    +      -       +      +
----------------------------------------------------------
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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