Format

Send to:

Choose Destination
See comment in PubMed Commons below
Plant Signal Behav. 2009 Feb;4(2):86-8.

Structure and function of homodomain-leucine zipper (HD-Zip) proteins.

Author information

  • 1Department of Plant Science, Faculty of Agriculture and Food Sciences, University of Manitoba, Manitoba, Canada.

Abstract

Homeodomain-leucine zipper (HD-Zip) proteins are transcription factors unique to plants and are encoded by more than 25 genes in Arabidopsis thaliana. Based on sequence analyses these proteins have been classified into four distinct groups: HD-Zip I-IV. HD-Zip proteins are characterized by the presence of two functional domains; a homeodomain (HD) responsible for DNA binding and a leucine zipper domain (Zip) located immediately C-terminal to the homeodomain and involved in protein-protein interaction. Despite sequence similarities HD-ZIP proteins participate in a variety of processes during plant growth and development. HD-Zip I proteins are generally involved in responses related to abiotic stress, abscisic acid (ABA), blue light, de-etiolation and embryogenesis. HD-Zip II proteins participate in light response, shade avoidance and auxin signalling. Members of the third group (HD-Zip III) control embryogenesis, leaf polarity, lateral organ initiation and meristem function. HD-Zip IV proteins play significant roles during anthocyanin accumulation, differentiation of epidermal cells, trichome formation and root development.

KEYWORDS:

development; embryogenesis; function; homeodomain-leucine zipper; signaling; structure

PMID:
19649178
[PubMed - indexed for MEDLINE]
PMCID:
PMC2637487
Free PMC Article
PubMed Commons home

PubMed Commons

0 comments
How to join PubMed Commons

    Supplemental Content

    Full text links

    Icon for Landes Bioscience Icon for PubMed Central
    Loading ...
    Write to the Help Desk