Dimerization specificity of all 67 B-ZIP motifs in Arabidopsis thaliana: a comparison to Homo sapiens B-ZIP motifs

Nucleic Acids Research
Christopher D DeppmannC R Vinson

Abstract

Basic region-leucine zipper (B-ZIP) proteins are a class of dimeric sequence-specific DNA-binding proteins unique to eukaryotes. We have identified 67 B-ZIP proteins in the Arabidopsis thaliana genome. No A.thaliana B-ZIP domains are homologous with any Homo sapiens B-ZIP domains. Here, we predict the dimerization specificity properties of the 67 B-ZIP proteins in the A.thaliana genome based on three structural properties of the dimeric alpha-helical leucine zipper coiled coil structure: (i) length of the leucine zipper, (ii) placement of asparagine or a charged amino acid in the hydrophobic interface and (iii) presence of interhelical electrostatic interactions. Many A.thaliana B-ZIP leucine zippers are predicted to be eight or more heptads in length, in contrast to the four or five heptads typically found in H.sapiens, a prediction experimentally verified by circular dichroism analysis. Asparagine in the a position of the coiled coil is typically observed in the second heptad in H.sapiens. In A.thaliana, asparagine is abundant in the a position of both the second and fifth heptads. The particular placement of asparagine in the a position helps define 14 families of homodimerizing B-ZIP proteins in A.thaliana, in contrast to t...Continue Reading

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