Plant Transcription Factor Database
Previous version: v3.0
Vitis vinifera
HSF Family
Species TF ID Description
GSVIVT01002066001HSF family protein
GSVIVT01003118001HSF family protein
GSVIVT01009477001HSF family protein
GSVIVT01010595001HSF family protein
GSVIVT01011632001HSF family protein
GSVIVT01013107001HSF family protein
GSVIVT01015183001HSF family protein
GSVIVT01015389001HSF family protein
GSVIVT01018041001HSF family protein
GSVIVT01019829001HSF family protein
GSVIVT01020781001HSF family protein
GSVIVT01021040001HSF family protein
GSVIVT01021269001HSF family protein
GSVIVT01022134001HSF family protein
GSVIVT01024378001HSF family protein
GSVIVT01033257001HSF family protein
GSVIVT01033781001HSF family protein
GSVIVT01035385001HSF family protein
GSVIVT01037333001HSF family protein
HSF Family Introduction

Heat stress transcription factors (Hsfs) are the major regulators of the plant heat stress (hs) response. Sequencing of the Arabidopsis genome revealed the existence of 21 open-reading frames (ORFs) encoding putative Hsfs assigned to classes A-C. Here we present results of a functional genomics approach to the Arabidopsis Hsf family focused on the analysis of their C-terminal domains (CTDs) harboring conserved modules for their function as transcription factors and their intracellular localization. Using reporter assays in tobacco protoplasts and yeast as well as glutathione-S-transferase (GST) pull-down assays, we demonstrate that short peptide motifs enriched with aromatic and large hydrophobic amino acid (aa) residues embedded in an acidic surrounding (AHA motifs) are essential for transcriptional activity of class A Hsfs. In contrast to this, class B and C Hsfs lack AHA motifs and have no activator function on their own. We also provide evidence for the function of a leucine (Leu)-rich region centered around a conserved QMGΦL motif at the very C-terminus as a nuclear export signal (NES) of class A Hsfs. Sequence comparison indicates that the combination of a C-terminal AHA motif with the consensus sequence FWxxF/L,F/I/L as well as the adjacent NES represents a signature domain for plant class A Hsfs, which allowed to identify more than 60 new Hsfs from the expressed sequence tag (EST) database.

Kotak S, Port M, Ganguli A, Bicker F, von Koskull-Doring P.
Characterization of C-terminal domains of Arabidopsis heat stress transcription factors (Hsfs) and identification of a new signature combination of plant class A Hsfs with AHA and NES motifs essential for activator function and intracellular localization.
Plant J, 2004. 39(1): p. 98-112.
PMID: 15200645