Contacts of the helix formed by residues 40 - 64 (chain C) in PDB entry 4NEF


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 SER 40 (chain C).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     43A  GLN*     4.8     4.7    -      -       -      -
     42B  LEU*     5.3     2.4    -      -       -      +
     38C  LEU      3.6     3.3    +      -       -      -
     39C  PRO*     1.3    75.4    -      -       -      +
     41C  VAL*     1.4    58.3    +      -       -      +
     42C  LEU*     3.7     6.9    +      -       -      +
     43C  GLN*     3.2    29.6    +      -       -      +
     44C  ILE*     3.0    30.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 41 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     37A  ALA*     4.7    15.7    -      -       +      +
     43A  GLN*     3.3    21.4    +      -       -      +
     40C  SER*     1.4    72.8    -      -       -      +
     42C  LEU*     1.4    57.9    +      -       -      +
     44C  ILE*     3.5     2.8    +      -       +      +
     45C  ALA*     2.9    30.3    +      -       -      +
    172C  HIS      4.2     0.2    -      -       -      +
    173C  LEU*     4.0    20.6    -      -       +      +
    176C  ILE*     3.7    36.1    -      -       +      +
    177C  HIS*     3.6    37.0    -      -       +      +
----------------------------------------------------------
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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
----------------------------------------------------------
     40A  SER*     5.3     2.0    -      -       -      +
     42A  LEU*     3.7    37.9    -      -       +      -
     43A  GLN*     3.5    26.2    +      -       +      +
     46A  MET*     3.6    33.9    -      -       +      -
     42B  LEU*     3.8    17.9    -      -       +      -
     40C  SER*     3.3     6.4    +      -       -      +
     41C  VAL*     1.4    75.0    -      -       -      +
     43C  GLN*     1.3    58.2    +      -       -      +
     45C  ALA*     3.4     1.8    +      -       +      +
     46C  MET*     2.9    43.5    +      -       -      +
    173C  LEU*     3.9    20.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLN 43 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     40B  SER*     4.7     5.1    -      -       -      -
     41B  VAL*     3.4    42.2    -      -       -      +
     42B  LEU*     3.4    25.3    -      -       +      +
    173B  LEU*     3.6    25.2    -      -       +      +
    177B  HIS*     4.5     4.5    +      -       -      -
     30C  SER*     4.5     5.2    -      -       -      +
     37C  ALA      5.7     0.3    -      -       -      +
     38C  LEU      5.0     2.6    +      -       -      -
     39C  PRO*     3.5    26.5    -      -       +      +
     40C  SER*     3.2    29.9    +      -       -      +
     42C  LEU*     1.3    75.6    -      -       -      +
     44C  ILE*     1.4    57.2    +      -       -      +
     46C  MET*     3.5     4.2    -      -       -      +
     47C  ALA*     3.0    26.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 44 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     27C  GLY      5.3     0.2    -      -       -      +
     30C  SER      4.1     2.7    -      -       -      +
     31C  ALA*     4.0    28.3    -      -       +      +
     39C  PRO*     3.8    32.3    -      -       +      +
     40C  SER      3.0    22.2    +      -       -      +
     41C  VAL*     4.7     3.1    -      -       -      +
     43C  GLN*     1.4    71.5    -      -       -      +
     45C  ALA*     1.4    65.9    +      -       -      +
     47C  ALA*     3.0    15.9    +      -       +      +
     48C  PHE*     3.1    40.8    +      -       +      -
    172C  HIS*     4.7     0.2    -      -       -      +
    176C  ILE*     3.7    28.7    -      -       +      -
    180C  GLY      5.8     1.1    -      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 45 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     41C  VAL      2.9    19.1    +      -       -      +
     42C  LEU*     3.5     3.8    -      -       +      +
     44C  ILE*     1.4    75.5    -      -       -      +
     46C  MET*     1.3    52.8    +      -       -      +
     48C  PHE*     3.6     1.7    +      -       -      +
     49C  GLY      2.9    28.1    +      -       -      -
    169C  ALA*     3.4    36.3    -      -       +      +
    172C  HIS*     3.6    19.1    -      -       +      -
    173C  LEU*     3.5    21.5    -      -       +      +
    176C  ILE*     4.1     0.6    -      -       -      +
----------------------------------------------------------
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Residues in contact with MET 46 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     46A  MET*     4.4    16.6    -      -       +      -
     50A  LEU*     5.4     1.3    -      -       -      -
     42B  LEU*     3.7    28.0    -      -       +      -
     46B  MET*     4.4    22.0    -      -       +      -
    166B  PHE*     5.1     0.4    -      -       +      -
    173B  LEU*     3.9     4.0    -      -       +      -
     42C  LEU*     2.9    32.6    +      -       -      +
     43C  GLN      3.5     6.1    -      -       -      +
     45C  ALA*     1.3    74.8    -      -       -      +
     47C  ALA*     1.3    58.6    +      -       -      +
     49C  GLY*     4.8     0.4    -      -       -      -
     50C  LEU*     2.8    58.1    +      -       +      +
    166C  PHE*     3.7    31.9    -      -       +      -
    169C  ALA*     4.9     8.3    -      -       -      -
----------------------------------------------------------
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Residues in contact with ALA 47 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    170B  LEU*     3.3    15.9    -      -       +      +
    173B  LEU*     3.5    16.8    -      -       +      +
     26C  PHE*     4.8     2.9    -      -       -      +
     27C  GLY*     4.9     5.6    +      -       -      +
     30C  SER*     3.5    35.2    -      -       -      +
     43C  GLN      3.0    13.8    +      -       -      +
     44C  ILE*     3.0     9.8    +      -       -      +
     46C  MET*     1.3    74.7    -      -       -      +
     48C  PHE*     1.3    59.7    +      -       +      +
     51C  GLY*     3.1    22.2    +      -       -      -
----------------------------------------------------------
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Residues in contact with PHE 48 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     23C  PHE*     3.6    32.0    -      +       -      -
     24C  VAL*     6.0     0.7    -      -       -      -
     27C  GLY*     3.3    42.4    -      -       -      -
     28C  LEU*     3.9     4.0    -      -       +      -
     31C  ALA*     4.2     4.3    -      -       +      -
     44C  ILE*     3.1    44.4    +      -       +      +
     45C  ALA      4.1     0.2    -      -       -      +
     47C  ALA*     1.3    72.8    -      -       +      +
     49C  GLY*     1.3    61.0    +      -       -      +
     51C  GLY*     3.3     1.4    +      -       -      -
     52C  ILE      3.1    23.9    +      -       -      -
    168C  VAL*     3.7    11.3    -      -       +      +
    172C  HIS*     3.4    38.6    -      +       +      +
    187C  ARG*     3.7    47.6    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLY 49 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     45C  ALA      2.9    18.8    +      -       -      -
     46C  MET      3.9     0.2    -      -       -      -
     48C  PHE*     1.3    78.3    -      -       -      +
     50C  LEU*     1.4    57.8    +      -       -      +
     51C  GLY      3.2     0.3    +      -       -      -
     52C  ILE*     3.3     0.9    +      -       -      -
     53C  GLY      3.1    22.7    +      -       -      -
    165C  GLY*     3.2    34.5    -      -       -      -
    166C  PHE*     6.2     1.1    -      -       -      -
    168C  VAL*     4.0     3.1    -      -       -      +
    169C  ALA*     3.9    10.3    -      -       -      -
----------------------------------------------------------
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Residues in contact with LEU 50 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     42B  LEU*     6.0     0.4    -      -       +      -
     46B  MET*     5.5     2.9    -      -       -      -
    166B  PHE*     3.7    60.5    -      -       +      +
    169B  ALA*     3.9    13.9    -      -       +      -
    170B  LEU*     3.8    12.7    -      -       +      +
    173B  LEU*     4.6     6.5    -      -       +      -
     46C  MET*     2.8    53.2    +      -       +      +
     49C  GLY*     1.4    68.2    -      -       -      -
     51C  GLY*     1.3    57.6    +      -       -      +
     53C  GLY*     4.0     2.7    -      -       -      +
     54C  THR*     2.6    37.7    +      -       -      +
    162C  LEU*     5.5     3.8    -      -       +      -
    165C  GLY      6.4     0.2    -      -       -      -
    166C  PHE*     4.3    13.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLY 51 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    170B  LEU*     3.7    16.6    -      -       -      +
     23C  PHE*     4.6     8.1    -      -       -      -
     26C  PHE*     5.8     2.0    -      -       -      -
     47C  ALA      3.1    20.1    +      -       -      -
     48C  PHE      3.6     2.7    -      -       -      -
     49C  GLY      3.1     0.6    -      -       -      -
     50C  LEU*     1.3    77.1    -      -       -      +
     52C  ILE*     1.3    62.6    +      -       -      +
     54C  THR*     3.8     1.7    -      -       -      -
     55C  LEU*     3.1    35.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 52 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     23C  PHE*     3.5    40.6    -      -       +      -
     48C  PHE      3.1    12.9    +      -       -      +
     49C  GLY      3.3     2.4    +      -       -      +
     51C  GLY*     1.3    73.2    -      -       -      +
     53C  GLY*     1.3    54.1    +      -       -      +
     55C  LEU*     3.1     4.4    +      -       -      +
     56C  VAL*     2.8    45.5    +      -       +      +
     66C  HIS      5.1     3.8    -      -       -      +
     67C  ILE*     3.8    33.4    -      -       +      +
     68C  ASN*     6.2     0.4    -      -       +      -
    164C  ILE*     3.9    23.8    -      -       +      -
    165C  GLY*     4.5     1.8    -      -       -      -
    168C  VAL*     3.8    31.0    -      -       +      -
    184C  ASN*     5.1     1.8    -      -       -      +
----------------------------------------------------------
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Residues in contact with GLY 53 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    163B  SER*     5.4     1.1    +      -       -      -
     49C  GLY      3.1    15.6    +      -       -      -
     50C  LEU*     4.1     2.2    -      -       -      -
     52C  ILE*     1.3    75.7    -      -       -      +
     54C  THR*     1.3    59.0    +      -       -      +
     56C  VAL*     4.6     0.4    -      -       -      -
     57C  GLN*     3.1    19.8    +      -       -      +
    161C  ALA*     3.3    35.8    -      -       -      +
    162C  LEU*     5.0    10.9    -      -       -      +
    165C  GLY*     3.8     4.6    -      -       -      -
----------------------------------------------------------
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Residues in contact with THR 54 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    140B  GLN*     3.5    28.5    -      -       +      +
    144B  CYS*     3.8    15.8    -      -       +      -
    163B  SER*     4.6     3.5    +      -       -      -
    166B  PHE*     4.2     4.5    +      -       -      +
    167B  SER*     3.7    31.7    +      -       -      +
    170B  LEU*     3.8     6.8    -      -       +      +
     50C  LEU      2.6    23.8    +      -       -      -
     51C  GLY      3.8     3.8    -      -       -      -
     52C  ILE      3.3     0.2    -      -       -      -
     53C  GLY*     1.3    74.8    -      -       -      +
     55C  LEU*     1.3    61.7    +      -       +      +
     57C  GLN*     3.4     7.3    +      -       -      +
     58C  ALA*     2.9    28.5    +      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 55 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    140B  GLN*     5.5     5.8    -      -       +      -
    143B  LEU*     5.8     1.3    -      -       +      -
    170B  LEU*     5.9     2.0    -      -       +      -
     19C  ALA*     3.4    33.4    -      -       +      +
     22C  LEU*     3.9    31.2    -      -       +      -
     23C  PHE*     3.7    26.0    -      -       +      +
     51C  GLY*     3.1    21.4    +      -       -      +
     52C  ILE      3.1     0.2    +      -       -      -
     54C  THR*     1.3    79.7    -      -       +      +
     56C  VAL*     1.3    59.1    +      -       -      +
     58C  ALA*     4.4     5.6    -      -       +      +
     59C  LEU*     2.9    41.6    +      -       +      +
     65C  ALA*     3.7     5.0    -      -       -      +
     67C  ILE*     3.7    18.8    -      -       +      -
----------------------------------------------------------
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Residues in contact with VAL 56 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    153B  ARG*     5.4     1.7    +      -       -      -
     52C  ILE*     2.8    35.6    +      -       +      +
     53C  GLY*     4.0     4.9    -      -       -      +
     55C  LEU*     1.3    74.8    -      -       -      +
     57C  GLN*     1.3    58.9    +      -       -      +
     60C  GLY*     2.9    27.9    +      -       -      -
     64C  GLY      5.4     3.1    -      -       -      +
     65C  ALA*     3.6    30.3    -      -       +      +
     67C  ILE*     4.3     2.0    -      -       +      -
    159C  THR*     4.0    20.9    -      -       +      -
    161C  ALA*     3.9    22.7    -      -       +      -
    164C  ILE*     4.3    16.8    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLN 57 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    144B  CYS*     4.1     7.0    -      -       -      +
    147B  ALA*     3.4     1.0    -      -       -      +
    148B  SER*     3.4    24.3    +      -       -      +
    153B  ARG*     2.8    51.1    +      -       -      +
    157B  PRO*     3.2    33.9    +      -       -      +
    159B  THR*     4.0     4.6    +      -       -      -
    163B  SER*     3.0    33.1    +      -       -      +
     53C  GLY      3.1    18.0    +      -       -      +
     54C  THR*     3.4     8.1    -      -       -      +
     56C  VAL*     1.3    79.7    -      -       -      +
     58C  ALA*     1.3    58.1    +      -       -      +
     61C  HIS*     4.1     0.7    -      -       -      -
    159C  THR      5.8     0.6    -      -       -      +
    161C  ALA*     3.7    14.0    -      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 58 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    140B  GLN      5.3     0.7    -      -       -      +
    143B  LEU*     3.8    33.0    -      -       +      +
    144B  CYS*     3.9     6.1    -      -       +      +
    147B  ALA*     3.6    13.2    -      -       -      +
    219B  TYR*     4.3     6.6    -      -       -      -
     54C  THR*     2.9    18.2    +      -       +      +
     55C  LEU*     4.2     8.7    -      -       +      +
     57C  GLN*     1.3    77.3    -      -       -      +
     59C  LEU*     1.3    72.5    +      -       +      +
     61C  HIS*     3.0    18.9    +      -       -      -
     62C  ILE*     4.6     0.5    -      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 59 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    143B  LEU*     5.0     6.7    -      -       +      -
    219B  TYR*     5.9     1.6    -      -       +      -
    223B  LEU*     3.8    38.6    -      -       +      -
     15C  ALA*     3.8    19.3    -      -       +      +
     18C  LEU*     4.7     9.4    -      -       +      -
     19C  ALA*     3.6    35.9    -      -       +      +
     22C  LEU*     5.5     0.2    -      -       +      -
     55C  LEU*     2.9    29.9    +      -       +      +
     58C  ALA*     1.3    89.9    -      -       +      +
     60C  GLY*     1.3    61.8    +      -       -      +
     61C  HIS*     3.3     3.6    -      -       -      -
     62C  ILE*     3.0    20.2    +      -       +      -
     63C  SER*     3.2    15.7    +      -       -      +
     65C  ALA*     4.0     8.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLY 60 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    153B  ARG*     6.1     0.2    -      -       -      -
     56C  VAL*     2.9    28.5    +      -       -      -
     58C  ALA      3.9     0.4    -      -       -      -
     59C  LEU*     1.3    70.4    -      -       -      +
     61C  HIS*     1.3    57.5    +      -       -      +
     62C  ILE      3.2     1.7    +      -       -      -
     64C  GLY*     2.8    29.5    +      -       -      -
     65C  ALA*     3.7    18.3    -      -       -      +
    159C  THR*     6.4     1.1    -      -       -      -
----------------------------------------------------------
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Residues in contact with HIS 61 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    147B  ALA*     3.7     3.8    -      -       -      +
    153B  ARG*     3.3    52.5    +      -       +      +
    219B  TYR*     3.0    30.0    -      +       -      -
    224B  PHE*     3.8    22.2    -      +       +      -
     57C  GLN      4.1     0.2    -      -       -      -
     58C  ALA      3.0    26.5    +      -       -      -
     60C  GLY*     1.3    76.6    -      -       -      +
     62C  ILE*     1.3    76.6    +      -       +      +
----------------------------------------------------------
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Residues in contact with ILE 62 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    219B  TYR*     5.2     1.8    -      -       +      -
    223B  LEU*     3.5    37.5    -      -       +      +
    224B  PHE*     4.4    18.4    -      -       +      -
      8C  ALA      4.7     1.9    -      -       -      +
     11C  ARG*     3.2    34.1    -      -       +      +
     12C  ALA*     3.4    15.8    +      -       -      +
     15C  ALA*     3.5    18.8    -      -       +      -
     58C  ALA      4.6     4.0    -      -       -      +
     59C  LEU*     3.0    11.2    +      -       +      +
     61C  HIS*     1.3   112.8    -      -       +      +
     63C  SER*     1.4    56.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with SER 63 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     12C  ALA*     3.3    27.6    -      -       -      -
     15C  ALA*     3.8    11.2    -      -       -      +
     16C  GLU*     2.9    20.7    +      -       -      -
     59C  LEU*     3.2     9.1    +      -       -      +
     60C  GLY      3.5     0.4    +      -       -      -
     62C  ILE*     1.4    76.0    -      -       -      +
     64C  GLY*     1.3    61.6    +      -       -      +
     65C  ALA*     3.3     6.6    +      -       -      -
     66C  HIS*     3.8     2.9    +      -       -      -
     85C  ARG*     5.4     0.6    -      -       -      +
     89C  TYR*     2.8    38.1    +      -       -      -
----------------------------------------------------------
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Residues in contact with GLY 64 (chain C). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     56C  VAL*     5.4     3.3    -      -       -      +
     60C  GLY*     2.8    20.1    +      -       -      -
     63C  SER*     1.3    78.7    -      -       -      +
     65C  ALA*     1.3    68.4    +      -       -      +
     66C  HIS*     3.5    12.4    +      -       -      -
----------------------------------------------------------
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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