Contacts of the helix formed by residues 240 - 243 (chain B) in PDB entry 1IAX


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 TYR 240 (chain B).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     54B  ALA*     3.3    21.1    -      -       -      +
    205B  THR*     4.9     0.9    -      -       +      -
    207B  PRO*     3.1    43.9    +      -       +      +
    208B  SER      4.9     2.2    -      -       -      -
    209B  ASN*     3.9     9.9    -      -       +      -
    238B  GLU*     3.1     1.4    -      -       -      +
    239B  ILE*     1.3    94.6    -      -       +      +
    241B  ALA*     1.3    62.9    +      -       -      +
    242B  ALA      3.4     2.2    -      -       -      -
    243B  THR*     2.9    31.8    +      -       -      +
    278B  LYS*     3.5    30.6    -      -       +      +
    279B  ASP*     3.9     1.8    -      -       -      -
    363B  GLY*     4.1    10.1    -      -       -      -
    364B  LEU*     3.9    17.0    -      -       +      -
    365B  PHE*     3.5    15.8    -      +       -      -
    501B  PLP      2.3    47.6    +      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 241 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    109B  THR*     3.2    26.5    -      -       +      +
    110B  ARG*     3.7     8.5    -      -       -      +
    207B  PRO*     3.5    10.7    -      -       -      +
    238B  GLU      3.1    16.3    +      -       -      +
    239B  ILE      3.4     1.6    -      -       -      -
    240B  TYR*     1.3    77.9    -      -       -      +
    242B  ALA*     1.3    59.1    +      -       -      +
    244B  VAL*     3.2    25.5    -      -       -      +
    250B  PHE*     3.6    25.4    -      -       +      +
    274B  TYR*     4.5     1.1    -      -       +      -
    279B  ASP*     3.4     3.5    +      -       -      +
----------------------------------------------------------
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Residues in contact with ALA 242 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    105B  PHE*     4.8     0.7    -      -       +      -
    109B  THR*     3.9    15.9    -      -       +      +
    241B  ALA*     1.3    71.9    -      -       -      +
    243B  THR*     1.3    59.7    +      -       -      +
    244B  VAL*     3.3     7.7    +      -       -      +
    279B  ASP*     2.7    36.9    +      -       +      +
    332B  LEU*     3.7    31.9    -      -       +      +
    335B  SER*     4.6    12.3    +      -       -      -
    336B  ALA*     5.4     3.1    +      -       -      +
    339B  LEU*     4.9     0.5    -      -       -      +
----------------------------------------------------------
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Residues in contact with THR 243 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
     56B  ASN*     4.0     9.6    -      -       -      +
    240B  TYR*     2.9    23.6    +      -       +      +
    241B  ALA      3.3     1.6    -      -       -      -
    242B  ALA*     1.3    80.4    -      -       -      +
    244B  VAL*     1.3    61.5    +      -       -      +
    245B  PHE*     3.5     8.7    -      -       -      -
    278B  LYS*     4.0    15.0    -      -       +      +
    279B  ASP*     4.0    16.2    -      -       +      +
    335B  SER*     6.0     0.2    -      -       -      +
    339B  LEU*     3.8    16.2    -      -       -      +
    362B  ALA*     3.2     5.0    -      -       -      -
    363B  GLY*     3.0    34.7    +      -       -      +
    364B  LEU*     3.8    23.3    -      -       +      -
----------------------------------------------------------
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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