PlantTFDB
PlantRegMap/PlantTFDB v5.0
Plant Transcription Factor Database
Chenopodium quinoa
HD-ZIP Family
Species TF ID Description
AUR62001044-RAHD-ZIP family protein
AUR62003152-RAHD-ZIP family protein
AUR62003264-RAHD-ZIP family protein
AUR62003712-RAHD-ZIP family protein
AUR62004302-RAHD-ZIP family protein
AUR62004541-RAHD-ZIP family protein
AUR62004911-RAHD-ZIP family protein
AUR62005746-RAHD-ZIP family protein
AUR62006027-RAHD-ZIP family protein
AUR62007058-RAHD-ZIP family protein
AUR62007123-RAHD-ZIP family protein
AUR62007346-RAHD-ZIP family protein
AUR62007975-RAHD-ZIP family protein
AUR62008353-RAHD-ZIP family protein
AUR62009262-RAHD-ZIP family protein
AUR62012660-RAHD-ZIP family protein
AUR62013727-RAHD-ZIP family protein
AUR62014881-RAHD-ZIP family protein
AUR62016015-RAHD-ZIP family protein
AUR62018023-RAHD-ZIP family protein
AUR62018653-RAHD-ZIP family protein
AUR62019921-RAHD-ZIP family protein
AUR62019992-RAHD-ZIP family protein
AUR62021220-RAHD-ZIP family protein
AUR62021744-RAHD-ZIP family protein
AUR62021994-RAHD-ZIP family protein
AUR62022184-RAHD-ZIP family protein
AUR62022715-RAHD-ZIP family protein
AUR62022751-RAHD-ZIP family protein
AUR62023427-RAHD-ZIP family protein
AUR62024965-RAHD-ZIP family protein
AUR62026261-RAHD-ZIP family protein
AUR62026453-RAHD-ZIP family protein
AUR62027204-RAHD-ZIP family protein
AUR62028812-RAHD-ZIP family protein
AUR62031089-RAHD-ZIP family protein
AUR62031613-RAHD-ZIP family protein
AUR62031889-RAHD-ZIP family protein
AUR62032758-RAHD-ZIP family protein
AUR62035595-RAHD-ZIP family protein
AUR62037903-RAHD-ZIP family protein
AUR62040157-RAHD-ZIP family protein
AUR62042187-RAHD-ZIP family protein
AUR62042444-RAHD-ZIP family protein
AUR62044008-RAHD-ZIP family protein
AUR62044145-RAHD-ZIP family protein
HD-ZIP Family Introduction

A homeobox (HB) encodes a protein domain, the homeodomain (HD), which is a conserved 60-amino acid motif present in transcription factors found in all the eukaryotic organisms. This 60-amino acid sequence folds into a characteristic three-helix structure that is able to interact specifically with DNA. Most HDs are able to bind DNA as monomers with high affinity, through interactions made by helix III (the so-called recognition helix) and a disordered N-terminal arm located beyond helix I. The high degree of conservation of this type of domain among diverse proteins from different kingdoms indicates that this structure is crucial to maintain the HD functionality and that the role played by this domain is vital.

Members of the HD-Zip family have a leucine zipper motif (LZ) immediately downstream of the HD. The two motifs are present in transcription factors found in species belonging to other eukaryotic kingdoms, but their association in a single protein is unique to plants. The HD is responsible for the specific binding to DNA, whereas LZ acts as a dimerization motif. HD-Zip proteins bind to DNA as dimers, and the absence of LZ absolutely abolishes their binding ability, which indicates that the relative orientation of the monomers, driven by this motif, is crucial for an efficient recognition of DNA.

Ariel FD, Manavella PA, Dezar CA, Chan RL.
The true story of the HD-Zip family.
Trends Plant Sci, 2007. 12(9): p. 419-26.
PMID: 17698401