Contacts of the helix formed by residues 183 - 212 (chain A) in PDB entry 2YPA


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 HIS 183 (chain A).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    182A  PRO*     1.3    87.7    -      -       +      +
    184A  THR*     1.3    63.6    +      -       -      +
    185A  LYS*     3.2    14.2    +      -       +      +
    186A  VAL*     3.4    26.6    +      -       +      +
    187A  VAL*     3.4    15.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with THR 184 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    182A  PRO      5.1     3.1    -      -       -      +
    183A  HIS*     1.3    69.1    -      -       -      +
    185A  LYS*     1.3    77.2    +      -       -      +
    186A  VAL      3.1     2.8    +      -       -      -
    187A  VAL*     3.9    11.1    -      -       +      +
    188A  ARG*     3.2    44.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 185 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    183A  HIS*     3.2     9.6    -      -       +      -
    184A  THR*     1.3    86.1    +      -       -      +
    186A  VAL*     1.3    65.4    +      -       +      +
    188A  ARG*     3.8    32.2    -      -       -      +
    189A  ARG*     3.5    22.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 186 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    182A  PRO*     5.7     6.1    -      -       +      -
    183A  HIS*     3.8    27.4    -      -       +      +
    184A  THR      3.1     0.6    -      -       -      -
    185A  LYS*     1.3    79.4    -      -       +      +
    187A  VAL*     1.3    67.2    +      -       +      +
    188A  ARG      3.0     2.0    -      -       -      -
    189A  ARG*     2.9    20.2    +      -       +      +
    190A  ILE*     2.9    32.6    +      -       +      +
----------------------------------------------------------
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Residues in contact with VAL 187 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    182A  PRO*     5.1    15.5    -      -       +      +
    183A  HIS      3.4    17.3    -      -       -      +
    184A  THR*     3.5    11.6    +      -       +      +
    186A  VAL*     1.3    76.9    -      -       +      +
    188A  ARG*     1.3    62.8    +      -       -      +
    190A  ILE*     3.6     9.9    +      -       +      +
    191A  PHE*     3.1    26.4    +      -       +      +
----------------------------------------------------------
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Residues in contact with ARG 188 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    184A  THR*     3.2    46.2    +      -       -      +
    185A  LYS*     3.8    30.7    -      -       -      +
    187A  VAL*     1.3    75.8    -      -       -      +
    189A  ARG*     1.3    56.6    +      -       +      +
    191A  PHE*     3.0     8.3    +      -       -      +
    192A  THR*     2.8    42.1    +      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 189 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    185A  LYS      3.5    15.5    -      -       -      +
    186A  VAL*     2.9    16.2    +      -       +      +
    188A  ARG*     1.3    74.6    -      -       +      +
    190A  ILE*     1.3    55.2    +      -       +      +
    192A  THR*     3.1    34.0    +      -       -      +
    193A  ASN*     2.7    65.2    +      -       -      +
     10E    T      3.6    45.7    +      -       -      +
     11E    G      3.5    37.1    +      -       -      -
     12E    T      6.2     0.2    -      -       -      +
----------------------------------------------------------
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Residues in contact with ILE 190 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    186A  VAL*     2.9    35.9    +      -       +      +
    187A  VAL*     3.9     8.7    -      -       +      +
    189A  ARG*     1.3    77.5    -      -       +      +
    191A  PHE*     1.3    62.8    +      -       -      +
    193A  ASN*     3.5    13.2    +      -       -      +
    194A  SER*     3.1    22.8    +      -       -      -
----------------------------------------------------------
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Residues in contact with PHE 191 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    187A  VAL*     3.1    18.2    +      -       +      +
    188A  ARG*     3.0    11.1    +      -       -      +
    190A  ILE*     1.3    78.5    -      -       -      +
    192A  THR*     1.3    62.7    +      -       -      +
    194A  SER*     3.3     9.0    +      -       -      -
    195A  ARG*     3.2    42.4    +      -       +      +
----------------------------------------------------------
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Residues in contact with THR 192 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    188A  ARG*     2.8    21.2    +      -       -      +
    189A  ARG*     3.4    32.5    +      -       -      +
    191A  PHE*     1.3    74.8    -      -       -      +
    193A  ASN*     1.3    65.8    +      -       -      +
    195A  ARG*     3.1    28.4    +      -       -      +
    196A  GLU*     3.1    24.1    +      -       +      +
     10E    T      5.3     3.6    -      -       +      -
     11E    G      5.8     2.5    -      -       -      +
----------------------------------------------------------
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Residues in contact with ASN 193 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    189A  ARG*     2.7    49.8    +      -       -      +
    190A  ILE*     3.7    12.5    -      -       -      +
    192A  THR*     1.3    72.5    -      -       -      +
    194A  SER*     1.3    63.0    +      -       -      +
    196A  GLU*     3.4     2.6    +      -       -      +
    197A  ARG*     3.0    24.3    +      -       -      +
      9E    C      3.7    38.0    +      -       -      +
     10E    T      2.9    43.1    +      -       +      +
----------------------------------------------------------
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Residues in contact with SER 194 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    190A  ILE*     3.1    11.6    +      -       -      -
    191A  PHE*     3.5    11.4    -      -       -      -
    192A  THR      3.1     0.8    -      -       -      -
    193A  ASN*     1.3    79.6    -      -       -      +
    195A  ARG*     1.3    58.8    +      -       -      +
    197A  ARG*     3.4     8.2    +      -       -      +
    198A  TRP*     3.0    27.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 195 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    191A  PHE*     3.2    33.4    +      -       +      +
    192A  THR*     3.1    34.5    +      -       -      +
    194A  SER*     1.3    74.9    -      -       -      +
    196A  GLU*     1.3    58.7    +      -       -      +
    198A  TRP*     3.1    16.0    +      -       +      +
    199A  ARG*     2.8    30.3    +      -       -      +
     22F    G      3.9    40.4    +      -       -      -
     23F    A      3.0    35.2    +      -       -      -
----------------------------------------------------------
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Residues in contact with GLU 196 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    192A  THR*     3.1    14.0    +      -       +      +
    193A  ASN      3.7     4.0    -      -       -      +
    195A  ARG*     1.3    79.3    -      -       -      +
    197A  ARG*     1.3    58.0    +      -       -      +
    199A  ARG*     3.0    32.6    +      -       -      +
    200A  GLN*     2.9    53.1    +      -       +      +
      9E    C      5.0     7.1    +      -       +      +
     10E    T      3.4    32.1    -      -       +      +
     11E    G      5.9     0.2    -      -       -      +
     24F    A      4.1     3.8    -      -       -      +
     25F    C      3.4    25.0    +      -       -      +
     26F    A      4.5     1.3    +      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 197 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    193A  ASN      3.0    17.2    +      -       -      +
    194A  SER*     3.7     8.3    -      -       -      +
    195A  ARG      3.2     0.2    -      -       -      -
    196A  GLU*     1.3    74.0    -      -       -      +
    198A  TRP*     1.3    66.7    +      -       -      +
    200A  GLN*     3.2     7.6    +      -       +      +
    201A  GLN*     2.9    53.5    +      -       +      +
      8E    T      2.8    54.4    +      -       +      +
      9E    C      4.4    12.6    -      -       -      +
----------------------------------------------------------
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Residues in contact with TRP 198 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    194A  SER      3.0    14.3    +      -       -      +
    195A  ARG*     3.3    19.7    -      -       +      +
    197A  ARG*     1.3    76.7    -      -       -      +
    199A  ARG*     1.3    75.1    +      -       +      +
    201A  GLN*     3.5    18.5    +      -       -      +
    202A  ASN*     3.1    49.9    +      -       -      +
     23F    A      6.0     3.1    -      -       -      -
----------------------------------------------------------
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Residues in contact with ARG 199 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    195A  ARG*     2.8    14.4    +      -       -      +
    196A  GLU*     3.0    40.9    +      -       -      +
    197A  ARG      3.1     0.2    -      -       -      -
    198A  TRP*     1.3    89.7    -      -       +      +
    200A  GLN*     1.3    76.6    +      -       -      +
    202A  ASN*     3.1    16.8    +      -       +      +
    203A  VAL*     3.2    29.4    +      -       +      +
    585B  LYS*     6.0     2.0    -      -       -      +
    586B  LEU*     5.7     5.4    -      -       +      +
     23F    A      4.2     7.6    -      -       +      -
     24F    A      3.7    64.7    +      -       -      +
     25F    C      3.9    23.8    +      -       -      -
----------------------------------------------------------
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Residues in contact with GLN 200 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    196A  GLU*     2.9    36.8    +      -       +      +
    197A  ARG*     3.2    11.6    +      -       +      +
    199A  ARG*     1.3    86.9    -      -       -      +
    201A  GLN*     1.3    67.0    +      -       -      +
    203A  VAL*     2.9    23.6    +      -       -      +
    204A  ASN*     3.0    24.7    -      -       -      +
      7E    A      6.6     0.2    -      -       +      -
      8E    T      4.5    29.1    +      -       +      +
      9E    C      5.5     1.4    -      -       -      +
     25F    C      5.6     0.4    -      -       -      -
     26F    A      4.9    10.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLN 201 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    197A  ARG*     2.9    57.7    +      -       +      +
    198A  TRP*     3.5    22.1    -      -       +      +
    199A  ARG      3.4     0.2    -      -       -      -
    200A  GLN*     1.3    74.0    -      -       -      +
    202A  ASN*     1.3    60.2    +      -       -      +
    204A  ASN*     2.9    13.1    +      -       -      +
    205A  GLY*     2.8    26.0    +      -       -      -
      8E    T      5.5     3.1    -      -       -      +
----------------------------------------------------------
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Residues in contact with ASN 202 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    198A  TRP*     3.1    56.0    +      -       -      +
    199A  ARG*     3.1    11.7    +      -       +      +
    200A  GLN      3.1     0.6    -      -       -      -
    201A  GLN*     1.3    83.4    -      -       -      +
    203A  VAL*     1.3    61.9    +      -       -      +
    205A  GLY*     3.4     3.9    +      -       -      +
    206A  ALA*     3.1    20.1    +      -       -      +
    586B  LEU*     3.9    18.2    -      -       +      +
----------------------------------------------------------
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Residues in contact with VAL 203 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    199A  ARG*     3.2    27.1    +      -       +      +
    200A  GLN*     2.9    20.7    +      -       -      +
    202A  ASN*     1.3    76.6    -      -       -      +
    204A  ASN*     1.3    61.1    +      -       -      +
    206A  ALA*     3.0     5.4    +      -       -      +
    207A  PHE*     2.9    39.7    +      -       +      -
    566B  PHE*     5.3     1.1    -      -       +      -
    585B  LYS*     5.1    15.0    -      -       +      -
    586B  LEU*     4.2    27.1    -      -       +      +
    589B  LEU*     3.7    19.5    -      -       +      -
     25F    C      5.9     0.4    -      -       -      +
----------------------------------------------------------
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Residues in contact with ASN 204 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    200A  GLN*     3.0    20.5    -      -       -      +
    201A  GLN*     2.9    11.3    +      -       -      +
    203A  VAL*     1.3    78.0    -      -       -      +
    205A  GLY*     1.3    66.8    +      -       -      +
    206A  ALA      3.0     1.5    +      -       -      -
    207A  PHE*     3.0    10.0    +      -       +      +
    208A  ALA*     2.9    25.4    +      -       -      +
    225A  LYS*     3.5    22.5    +      -       -      +
      7E    A      2.9    32.3    +      -       -      -
----------------------------------------------------------
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Residues in contact with GLY 205 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    201A  GLN      2.8    13.1    +      -       -      -
    202A  ASN*     3.7     6.3    -      -       -      -
    203A  VAL      3.4     0.2    -      -       -      -
    204A  ASN*     1.3    75.3    -      -       -      +
    206A  ALA*     1.3    55.7    +      -       -      +
    208A  ALA*     3.4     6.8    +      -       -      +
    209A  GLU*     3.1    30.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 206 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    202A  ASN      3.1    11.6    +      -       -      +
    203A  VAL      3.0    11.1    +      -       -      +
    204A  ASN      3.0     0.6    -      -       -      -
    205A  GLY*     1.3    74.0    -      -       -      +
    207A  PHE*     1.3    65.0    +      -       -      +
    209A  GLU*     3.3     9.6    +      -       -      +
    210A  LEU*     3.1    22.0    +      -       -      +
    586B  LEU*     4.1    14.8    -      -       +      +
    589B  LEU*     3.8    32.1    -      -       +      +
    590B  GLN*     5.2     4.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with PHE 207 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    203A  VAL*     2.9    42.0    +      -       +      -
    204A  ASN*     3.0     8.7    +      -       +      +
    206A  ALA*     1.3    75.9    -      -       -      +
    208A  ALA*     1.3    57.1    +      -       -      +
    210A  LEU*     3.2     7.0    +      -       -      +
    211A  ARG*     2.8    28.5    +      -       -      +
    225A  LYS*     3.7    63.0    -      -       +      +
    228A  ILE*     3.9    33.6    -      -       +      +
    229A  LEU*     3.8    15.0    -      -       +      -
    562B  ILE*     5.6     0.4    -      -       +      -
    566B  PHE*     3.7    27.4    -      +       -      -
    589B  LEU*     4.0    12.1    -      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 208 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    204A  ASN      2.9    15.5    +      -       -      +
    205A  GLY*     3.6     7.6    -      -       -      +
    207A  PHE*     1.3    74.1    -      -       -      +
    209A  GLU*     1.3    66.1    +      -       -      +
    211A  ARG*     3.3     9.1    +      -       -      +
    212A  LYS*     3.0    35.9    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLU 209 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    205A  GLY      3.1    16.9    +      -       -      +
    206A  ALA*     3.4    12.3    -      -       -      +
    208A  ALA*     1.3    78.8    -      -       -      +
    210A  LEU*     1.3    62.7    +      -       -      +
    212A  LYS*     3.5    36.8    +      -       -      +
    213A  LEU*     3.7    11.3    -      -       -      +
    593B  VAL*     4.2    26.6    -      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 210 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    206A  ALA      3.1    10.2    +      -       -      +
    207A  PHE*     3.4     8.5    -      -       -      +
    209A  GLU*     1.3    77.3    -      -       -      +
    211A  ARG*     1.3    67.5    +      -       -      +
    213A  LEU*     2.8    22.3    +      -       +      +
    214A  ILE*     3.6     6.0    +      -       +      +
    228A  ILE*     3.9    22.9    -      -       +      -
    229A  LEU*     4.9     0.9    -      -       +      -
    232A  ALA*     4.0    19.5    -      -       +      -
    569B  LEU*     4.7     5.6    -      -       +      -
    589B  LEU*     4.0    22.9    -      -       +      +
    592B  ALA*     4.0    25.1    -      -       +      -
    593B  VAL*     3.8    15.2    -      -       +      +
    596B  ILE*     3.8    28.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with ARG 211 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    207A  PHE      2.8    17.4    +      -       -      +
    208A  ALA*     3.4    13.0    -      -       -      +
    210A  LEU*     1.3    72.8    -      -       -      +
    212A  LYS*     1.3    59.0    +      -       +      +
    213A  LEU      2.7    12.1    +      -       -      -
    214A  ILE*     2.8    36.7    +      -       -      +
    216A  THR*     3.1    16.9    +      -       -      +
    219A  PRO      2.7    28.8    +      -       -      -
    220A  ASP      4.2     0.8    -      -       -      -
    221A  LYS      3.2    22.6    +      -       -      -
    223A  LEU*     3.5    35.6    -      -       -      +
    228A  ILE*     4.3    15.4    -      -       +      +
----------------------------------------------------------
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Residues in contact with LYS 212 (chain A). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    208A  ALA*     3.0    21.4    +      -       -      +
    209A  GLU*     3.5    43.0    +      -       -      +
    210A  LEU      3.2     0.2    +      -       -      -
    211A  ARG*     1.3    79.0    -      -       +      +
    213A  LEU*     1.3    64.1    +      -       +      +
    214A  ILE      5.0     0.7    -      -       -      +
     86C  ARG*     4.2    10.2    +      -       -      -
    102C  ARG*     4.9     1.0    +      -       -      -
    104C  TYR*     4.5     6.4    +      -       -      -
----------------------------------------------------------
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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