Open Close
Reference
Citation
Fassler, J., Landsman, D., Acharya, A., Moll, J.R., Bonovich, M., Vinson, C. (2002). B-ZIP proteins encoded by the Drosophila genome: evaluation of potential dimerization partners.  Genome Res. 12(8): 1190--1200.
FlyBase ID
FBrf0152056
Publication Type
Research paper
Abstract

The basic region-leucine zipper (B-ZIP) (bZIP) protein motif dimerizes to bind specific DNA sequences. We have identified 27 B-ZIP proteins in the recently sequenced Drosophila melanogaster genome. The dimerization specificity of these 27 B-ZIP proteins was evaluated using two structural criteria: (1) the presence of attractive or repulsive interhelical g<-->e' electrostatic interactions and (2) the presence of polar or charged amino acids in the 'a' and 'd' positions of the hydrophobic interface. None of the B-ZIP proteins contain only aliphatic amino acids in the'a' and 'd' position. Only six of the Drosophila B-ZIP proteins contain a "canonical" hydrophobic interface like the yeast GCN4, and the mammalian JUN, ATF2, CREB, C/EBP, and PAR leucine zippers, characterized by asparagine in the second 'a' position. Twelve leucine zippers contain polar amino acids in the first, third, and fourth 'a' positions. Circular dichroism spectroscopy, used to monitor thermal denaturations of a heterodimerizing leucine zipper system containing either valine (V) or asparagine (N) in the 'a' position, indicates that the V-N interaction is 2.3 kcal/mole less stable than an N-N interaction and 5.3 kcal/mole less stable than a V-V interaction. Thus, we propose that the presence of polar amino acids in novel positions of the 'a' position of Drosophila B-ZIP proteins has led to leucine zippers that homodimerize rather than heterodimerize.

PubMed ID
PubMed Central ID
PMC186634 (PMC) (EuropePMC)
Related Publication(s)
Review

Intraproteomic networks: new forays into predicting interaction partners.
Aravind and Iyer, 2002, Genome Res. 12(8): 1156--1158 [FBrf0152054]

Associated Information
Comments
Associated Files
Other Information
Secondary IDs
    Language of Publication
    English
    Additional Languages of Abstract
    Parent Publication
    Publication Type
    Journal
    Abbreviation
    Genome Res.
    Title
    Genome Research
    Publication Year
    1995-
    ISBN/ISSN
    1088-9051
    Data From Reference