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The protein encoded by this gene is a homeodomain protein that lacks certain conserved residues required for DNA binding. It was reported that choriocarcinoma cell lines and tissues failed to express this gene, which suggested the possible involvement of this gene in malignant conversion of placental trophoblasts.
Homeodomain-interacting protein kinase 2 is an enzyme that in humans is encoded by the HIPK2 gene. [5] HIPK2 can be categorized as a Serine/Threonine Protein kinase, specifically one that interacts with homeodomain transcription factors. [6] It belongs to a family of protein kinases known as the DYRK kinases. [7]
Homeodomain proteins function as transcription factors due to the DNA binding properties of the conserved HTH motif. Homeodomain proteins are considered to be master control genes, meaning that a single protein can regulate expression of many target genes.
The same Hox protein can act as a repressor at one gene and an activator at another. The ability of Hox proteins to bind DNA is conferred by a part of the protein referred to as the homeodomain. The homeodomain is a 60-amino-acid-long DNA-binding domain (encoded by its corresponding 180-base-pair DNA sequence, the homeobox
Homeodomain proteins are transcription factors that share a DNA-binding domain called the homeodomain. [1] Changes in the expression and function of homeotic genes are responsible for the changes in the morphology of the limbs of arthropods as well as in the axial skeletons of vertebrates.
Homeobox protein Hox-A9 is a protein that in humans is encoded by the HOXA9 gene. [ 5 ] [ 6 ] In vertebrates , the genes encoding the class of transcription factors called homeobox genes are found in clusters named A, B, C, and D on four separate chromosomes.
The POU domain is a bipartite domain composed of two subunits separated by a non-conserved region of 15-55 aa. The N-terminal subunit is known as the POU-specific (POUs) domain (InterPro: IPR000327), while the C-terminal subunit is a homeobox domain (InterPro: IPR007103). 3D structures of complexes including both POU subdomains bound to DNA are available.
Zinc finger E-box-binding homeobox 1 is a protein that in humans is encoded by the ZEB1 gene. [5] [6] [7]ZEB1 (previously known as TCF8) encodes a zinc finger and homeodomain transcription factor that represses T-lymphocyte-specific IL2 gene expression by binding to a negative regulatory domain 100 nucleotides 5-prime of the IL2 transcription start site.