Contacts of the helix formed by residues 97 - 123 (chain L) in PDB entry 5XVO


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 THR 97 (chain L).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     95L  ALA      3.9     8.7    -      -       -      +
     96L  TRP*     1.3    73.1    -      -       -      +
     98L  GLU*     1.3    65.0    +      -       -      +
     99L  GLU*     3.7     6.8    +      -       -      +
    100L  ARG*     3.0    27.7    +      -       -      +
    101L  LYS*     3.0    22.4    +      -       -      +
    278L  GLN*     3.5    19.4    +      -       -      +
----------------------------------------------------------
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Residues in contact with GLU 98 (chain L). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     96L  TRP      3.9     1.4    +      -       -      -
     97L  THR*     1.3    72.9    -      -       -      +
     99L  GLU*     1.3    63.7    +      -       -      +
    101L  LYS*     3.6    16.3    +      -       -      +
    102L  GLY      3.1    16.6    +      -       -      -
    142L  PHE*     3.6    24.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLU 99 (chain L). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     97L  THR*     3.1     6.5    +      -       -      +
     98L  GLU*     1.3    81.8    +      -       -      +
    100L  ARG*     1.3    64.8    +      -       -      +
    102L  GLY*     3.0     3.1    +      -       -      -
    103L  GLN*     2.9    47.7    +      -       +      +
    141L  LEU*     4.1    13.0    -      -       +      +
----------------------------------------------------------
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Residues in contact with ARG 100 (chain L). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     97L  THR*     3.0    27.1    +      -       -      +
     99L  GLU*     1.3    78.1    -      -       -      +
    101L  LYS*     1.3    61.8    +      -       +      +
    103L  GLN*     3.3    23.3    +      -       -      +
    104L  VAL*     3.0    31.7    +      -       -      +
    275L  VAL*     3.0    30.5    +      -       -      +
    276L  LEU*     3.7    28.5    -      -       +      +
    278L  GLN*     3.4    33.9    +      -       -      +
    280L  GLU      3.5    11.9    +      -       -      -
    281L  GLU*     3.0    37.7    +      -       -      +
    282L  GLY      5.2     0.8    -      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 101 (chain L). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     96L  TRP*     4.0    34.4    +      -       +      -
     97L  THR      3.0    16.0    +      -       -      +
     98L  GLU*     3.8    26.0    -      -       -      +
    100L  ARG*     1.3    74.6    -      -       -      +
    102L  GLY*     1.3    54.6    +      -       -      +
    104L  VAL*     3.8     0.7    -      -       -      +
    105L  TRP*     2.8    37.9    +      -       -      +
    142L  PHE*     3.9     4.3    -      -       +      -
    201L  GLY      4.8     6.7    +      -       -      +
    202L  LEU*     4.0    46.4    +      -       +      +
    205L  ALA*     6.3     1.0    -      -       -      +
    276L  LEU*     4.0    10.8    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLY 102 (chain L). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     98L  GLU      3.1     7.9    +      -       -      -
     99L  GLU      3.0     7.6    +      -       -      -
    101L  LYS*     1.3    73.2    -      -       -      +
    103L  GLN*     1.3    63.1    +      -       -      +
    106L  THR*     2.6    33.5    +      -       -      -
    141L  LEU*     4.0    10.8    -      -       -      -
    142L  PHE*     3.2    33.1    -      -       -      -
----------------------------------------------------------
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Residues in contact with GLN 103 (chain L). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     99L  GLU*     2.9    44.5    +      -       -      +
    100L  ARG*     3.6    31.9    +      -       -      +
    102L  GLY*     1.3    74.5    -      -       -      +
    104L  VAL*     1.3    59.1    +      -       +      +
    106L  THR*     3.8     2.1    -      -       -      -
    107L  ALA*     2.9    31.6    +      -       -      +
    141L  LEU*     3.9    18.3    -      -       +      +
----------------------------------------------------------
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Residues in contact with VAL 104 (chain L). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    100L  ARG*     3.0    24.1    +      -       -      +
    101L  LYS      3.9     2.5    -      -       -      +
    103L  GLN*     1.3    81.2    -      -       +      +
    105L  TRP*     1.3    64.9    +      -       -      +
    107L  ALA*     3.3     1.9    +      -       -      +
    108L  ILE*     3.0    41.6    +      -       +      +
    202L  LEU*     4.0    10.1    -      -       +      -
    272L  VAL*     4.0    18.6    -      -       +      -
    275L  VAL*     3.4    30.7    -      -       +      -
    276L  LEU*     3.9    17.0    -      -       +      -
    283L  VAL*     4.0    14.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with TRP 105 (chain L). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    101L  LYS      2.8    23.2    +      -       -      +
    102L  GLY      4.0     1.6    -      -       -      +
    104L  VAL*     1.3    73.4    -      -       -      +
    106L  THR*     1.3    74.6    +      -       +      +
    108L  ILE*     3.2     9.4    +      -       +      +
    109L  ILE*     2.9    58.5    +      -       +      +
    142L  PHE*     3.6    34.8    -      +       +      -
    143L  ASP*     3.7    20.4    -      -       +      -
    148L  GLU*     4.0    12.3    -      -       -      -
    202L  LEU*     4.0    22.4    -      -       +      +
    203L  LYS*     3.7    36.8    -      -       +      +
    216L  ASP*     3.5    38.7    +      -       +      +
    219L  GLU*     5.9     1.2    -      -       -      +
----------------------------------------------------------
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Residues in contact with THR 106 (chain L). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    102L  GLY      2.6    22.5    +      -       -      -
    103L  GLN*     3.9     3.1    -      -       -      -
    105L  TRP*     1.3    84.8    -      -       +      +
    107L  ALA*     1.3    67.0    +      -       -      +
    109L  ILE*     3.4     2.3    +      -       +      +
    110L  ALA*     3.0    23.6    +      -       +      +
    139L  LEU*     4.4    23.5    -      -       +      +
    140L  ARG      3.9    22.7    -      -       -      +
    141L  LEU*     3.5     8.2    -      -       +      -
    142L  PHE      3.1    21.8    +      -       -      -
----------------------------------------------------------
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Residues in contact with ALA 107 (chain L). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    103L  GLN      2.9    18.5    +      -       -      +
    104L  VAL*     3.3     7.4    +      -       -      +
    106L  THR*     1.3    74.7    -      -       -      +
    108L  ILE*     1.3    61.3    +      -       -      +
    110L  ALA*     3.3     8.1    -      -       -      +
    111L  GLN*     3.2    27.9    +      -       -      +
    283L  VAL*     4.2    23.8    -      -       +      -
----------------------------------------------------------
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Residues in contact with ILE 108 (chain L). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    104L  VAL*     3.0    36.4    +      -       +      +
    105L  TRP*     3.4    12.3    -      -       +      +
    106L  THR      3.1     0.2    -      -       -      -
    107L  ALA*     1.3    75.2    -      -       -      +
    109L  ILE*     1.3    67.1    +      -       +      +
    111L  GLN*     3.0    22.2    +      -       -      +
    112L  LYS*     3.1     9.0    +      -       -      +
    202L  LEU*     4.8     3.1    -      -       +      -
    216L  ASP*     3.5    22.2    -      -       +      +
    217L  LEU*     4.1    25.8    -      -       +      +
    219L  GLU*     4.1     5.2    -      -       +      -
    220L  PRO*     3.7    22.9    -      -       +      +
    268L  TYR*     3.9    13.9    -      -       -      +
    272L  VAL*     4.3     8.3    -      -       +      -
    283L  VAL*     4.5    10.1    -      -       +      -
----------------------------------------------------------
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Residues in contact with ILE 109 (chain L). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    105L  TRP*     2.9    51.0    +      -       +      +
    106L  THR      4.0     3.1    -      -       -      +
    108L  ILE*     1.3    76.5    -      -       +      +
    110L  ALA*     1.3    64.6    +      -       -      +
    112L  LYS*     3.0     9.5    +      -       +      +
    113L  ILE*     2.9    40.3    +      -       +      +
    139L  LEU*     4.4    13.7    -      -       +      -
    143L  ASP*     5.3     0.2    -      -       -      +
    148L  GLU*     3.2    46.7    -      -       +      +
    219L  GLU*     3.7    24.7    -      -       +      +
----------------------------------------------------------
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Residues in contact with ALA 110 (chain L). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    106L  THR      3.0    12.8    +      -       -      +
    107L  ALA*     3.3    14.1    -      -       -      +
    109L  ILE*     1.3    77.6    -      -       -      +
    111L  GLN*     1.3    56.9    +      -       +      +
    113L  ILE*     3.2     3.2    +      -       -      -
    114L  THR*     2.8    34.5    +      -       -      -
    136L  ARG*     3.6    19.4    -      -       +      +
    139L  LEU*     3.9    20.6    -      -       +      +
----------------------------------------------------------
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Residues in contact with GLN 111 (chain L). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    107L  ALA*     3.2    14.1    +      -       -      +
    108L  ILE*     3.0     9.2    +      -       -      +
    110L  ALA*     1.3    76.6    -      -       +      +
    112L  LYS*     1.3    57.1    +      -       -      +
    114L  THR*     3.5     7.9    -      -       -      -
    115L  ASN*     2.9    35.5    +      -       -      +
    220L  PRO*     4.0    10.2    -      -       +      +
    268L  TYR*     3.3    17.5    +      -       -      -
    283L  VAL*     3.3    17.8    -      -       -      +
    284L  PRO      2.9    22.6    +      -       -      -
    285L  GLU*     3.5    23.8    -      -       +      +
    286L  PHE      3.1    27.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with LYS 112 (chain L). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    108L  ILE      3.1     6.1    +      -       -      +
    109L  ILE*     3.0    15.7    +      -       +      +
    111L  GLN*     1.3    75.9    -      -       -      +
    113L  ILE*     1.3    53.8    +      -       -      +
    115L  ASN*     3.0     5.9    +      -       -      +
    116L  GLN*     2.8    69.1    +      -       +      +
    148L  GLU*     3.4    30.5    +      -       -      +
    152L  ALA*     4.8     8.1    -      -       -      +
    219L  GLU*     3.0    56.1    +      -       +      +
    220L  PRO*     3.9    10.3    -      -       +      +
    222L  ARG*     4.3    15.0    -      -       -      +
    223L  PRO*     4.3     4.4    -      -       +      +
----------------------------------------------------------
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Residues in contact with ILE 113 (chain L). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    109L  ILE*     2.9    33.3    +      -       +      +
    110L  ALA      3.7     5.6    -      -       -      +
    112L  LYS*     1.3    79.0    -      -       +      +
    114L  THR*     1.3    63.4    +      -       -      +
    116L  GLN*     3.1    18.9    +      -       -      +
    117L  SER*     2.9    22.2    +      -       -      -
    132L  LEU*     3.6    36.1    -      -       +      +
    133L  LEU*     5.3     0.2    -      -       -      -
    135L  MET      5.2     0.2    -      -       -      -
    136L  ARG*     4.0    14.6    -      -       +      +
    139L  LEU*     4.2    19.7    -      -       +      -
    147L  ARG*     4.5     2.7    -      -       +      +
    148L  GLU*     4.1    21.1    -      -       -      +
    151L  ALA*     4.3    15.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with THR 114 (chain L). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    110L  ALA      2.8    26.8    +      -       -      -
    111L  GLN*     3.5    11.6    -      -       -      -
    113L  ILE*     1.3    71.8    -      -       -      +
    115L  ASN*     1.3    60.5    +      -       -      +
    117L  SER*     3.1     4.3    +      -       -      -
    118L  LEU*     2.8    43.9    +      -       +      +
    133L  LEU*     4.4    19.1    -      -       +      -
    136L  ARG*     3.4    25.2    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASN 115 (chain L). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    111L  GLN      2.9    18.9    +      -       -      +
    112L  LYS      3.5     3.8    -      -       -      +
    114L  THR*     1.3    76.5    -      -       -      +
    116L  GLN*     1.3    65.6    +      -       -      +
    118L  LEU*     3.9     9.3    -      -       -      +
    119L  HIS*     3.0    20.4    +      -       -      +
    220L  PRO*     3.0    24.7    +      -       -      +
    223L  PRO*     3.7    17.4    -      -       +      +
    286L  PHE*     3.0    25.5    +      -       -      +
    287L  GLY*     3.2    20.5    -      -       -      -
    288L  ILE*     3.3    30.1    +      -       +      +
----------------------------------------------------------
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Residues in contact with GLN 116 (chain L). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    112L  LYS*     2.8    53.6    +      -       +      +
    113L  ILE*     3.1    22.0    +      -       -      +
    115L  ASN*     1.3    73.8    -      -       -      +
    117L  SER*     1.3    63.1    +      -       -      +
    119L  HIS      3.3     1.6    +      -       -      -
    120L  LEU*     3.0    18.0    +      -       -      +
    132L  LEU*     3.7     6.1    -      -       +      -
    148L  GLU      4.8     0.3    -      -       -      +
    151L  ALA*     4.2    13.0    -      -       -      +
    152L  ALA*     4.2    13.0    +      -       -      +
    155L  TYR*     3.2    63.3    -      -       +      -
    156L  PHE*     4.9     3.8    -      -       -      -
    222L  ARG*     6.2     1.6    -      -       -      +
    223L  PRO*     3.9     9.6    -      -       +      +
    226L  ASP*     4.9     2.4    +      -       -      -
----------------------------------------------------------
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Residues in contact with SER 117 (chain L). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    113L  ILE      2.9    11.4    +      -       -      -
    114L  THR      3.4     8.1    -      -       -      -
    116L  GLN*     1.3    76.7    -      -       -      +
    118L  LEU*     1.3    57.8    +      -       -      +
    120L  LEU*     2.8     9.9    +      -       -      +
    121L  ALA*     2.8    26.3    +      -       -      +
    129L  ALA*     3.1    23.7    +      -       -      +
    132L  LEU*     2.7    36.7    -      -       -      +
    133L  LEU*     3.5    20.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 118 (chain L). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    114L  THR*     2.8    30.9    +      -       +      +
    115L  ASN*     3.8    24.9    -      -       -      +
    117L  SER*     1.3    72.0    -      -       -      +
    119L  HIS*     1.3    56.9    +      -       -      +
    121L  ALA*     3.4    11.6    +      -       +      +
    122L  GLN*     2.9    28.7    +      -       -      +
    287L  GLY*     5.1     3.1    -      -       -      -
    288L  ILE*     4.1    26.9    -      -       +      +
----------------------------------------------------------
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Residues in contact with HIS 119 (chain L). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    115L  ASN      3.0    17.7    +      -       -      +
    116L  GLN      3.4     4.9    -      -       -      +
    118L  LEU*     1.3    75.5    -      -       -      +
    120L  LEU*     1.3    64.5    +      -       -      +
    122L  GLN*     3.2    20.3    -      -       -      +
    123L  ARG*     3.2    42.2    +      -       -      +
    155L  TYR*     2.8    28.7    +      -       -      +
    159L  LEU*     3.7    20.8    -      -       +      +
    223L  PRO*     4.7     2.2    +      -       +      -
    226L  ASP*     3.8     6.5    -      -       -      +
    227L  GLN*     3.6    39.8    +      -       +      +
    230L  TYR*     4.3     4.6    -      -       +      +
    288L  ILE*     3.8    11.1    -      -       +      +
----------------------------------------------------------
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Residues in contact with LEU 120 (chain L). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    116L  GLN      3.0    12.6    +      -       -      +
    117L  SER*     2.8     7.8    +      -       -      +
    119L  HIS*     1.3    73.6    -      -       -      +
    121L  ALA*     1.3    66.1    +      -       -      +
    123L  ARG*     2.9    14.2    +      -       -      +
    125L  TYR*     3.1    28.3    +      -       +      +
    128L  LYS*     4.1    18.6    -      -       +      +
    129L  ALA*     4.1     8.1    -      -       +      -
    132L  LEU*     3.7    38.6    -      -       +      -
    155L  TYR*     3.8    15.3    -      -       +      +
    158L  THR*     3.8    31.0    -      -       +      +
    159L  LEU*     3.8    26.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 121 (chain L). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    117L  SER      2.8    14.4    +      -       -      +
    118L  LEU*     3.5    17.7    -      -       +      +
    120L  LEU*     1.3    71.7    -      -       -      +
    122L  GLN*     1.3    57.9    +      -       -      +
    124L  ASP*     2.8    26.3    +      -       -      +
    125L  TYR      4.5     5.8    -      -       -      +
    126L  GLY*     4.7     4.6    +      -       -      +
    129L  ALA*     3.9    14.6    -      -       +      +
----------------------------------------------------------
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Residues in contact with GLN 122 (chain L). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    118L  LEU      2.9    13.9    +      -       -      +
    119L  HIS*     3.2    20.2    -      -       +      +
    121L  ALA*     1.3    76.6    -      -       -      +
    123L  ARG*     1.3    91.5    +      -       -      +
    124L  ASP*     3.3     7.8    +      -       -      +
    227L  GLN*     2.8    26.3    +      -       -      +
    231L  GLU*     4.5     4.4    +      -       -      -
    288L  ILE*     4.7     4.7    -      -       -      +
----------------------------------------------------------
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Residues in contact with ARG 123 (chain L). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    119L  HIS*     3.2    36.8    +      -       -      +
    120L  LEU      2.9     4.7    +      -       -      +
    122L  GLN*     1.3   102.4    +      -       -      +
    124L  ASP*     1.3    69.7    +      -       -      +
    125L  TYR*     3.2    32.8    -      -       +      -
    159L  LEU*     4.2    11.9    -      -       +      -
    227L  GLN*     3.5    12.3    +      -       -      +
    230L  TYR*     3.2    35.7    -      -       +      +
    231L  GLU*     3.1    39.2    +      -       -      +
----------------------------------------------------------
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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