Kv12.3

Description: potassium voltage-gated channel, subfamily H (eag-related), member 4
Gene: Kcnh4 Synonyms: Kv12.3

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Introduction

KCNH4 encodes Kv12.3 (also known as BEC2; ELK1), a pore-forming (alpha) subunit. The gene is brain-specific, and located in the neocortex and the striatum. It may be involved in cellular excitability of restricted neurons in the central nervous system.

http://www.ncbi.nlm.nih.gov/gene/23415

Experimental data

Rat Kv12.3 gene in CHO host cell datasheet
Click for details 15 °C show 71 cells	Click for details 25 °C show 64 cells	Click for details 35 °C show 92 cells

Mouse Kv12.3 gene in CHO host cell datasheet
	Click for details 25 °C show 55 cells	Click for details 35 °C show 112 cells
Human Kv12.3 gene in CHO host cell datasheet
	Click for details 25 °C show 58 cells	Click for details 35 °C show 84 cells

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Gene

See figure 2 in Gutman [606] for a phylogenetic tree.

RGD ID	Chromosome	Position	Species
621415	10	89677981-89697799	Rat
1607166		-	Mouse
733889	17	40308910-40333296	Human

Kcnh4 : potassium voltage-gated channel, subfamily H (eag-related), member 4

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Transcript

Acc No	Sequence		Length	Source
NM_053630	n/A		n/A	NCBI
NM_012285	n/A		n/A	NCBI

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Ontology

Accession		Name			Definition					Evidence
GO:0016021		integral to membrane			Penetrating at least one phospholipid bilayer of a membrane. May also refer to the state of being buried in the bilayer with no exposure outside the bilayer. When used to describe a protein, indicates that all or part of the peptide sequence is embedded in the membrane.					IEA
GO:0016020		membrane			Double layer of lipid molecules that encloses all cells, and, in eukaryotes, many organelles; may be a single or double lipid bilayer; also includes associated proteins.					IEA

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Interaction

Ba2+

Ba2+ blocks Kv12.3. [809]

KCNH8

Coexpression of KCNH8 with dominant-negative KCNH8, KCNH3, and KCNH4 subunits led to suppression of the KCNH8 currents, suggesting that Elk channels can form heteromultimers. [808]

pH

Kv10.2, Kv12.2, and Kv12.3 are similarly modulated by external pH. Thus high pH sensitivity has now been observed for six of eight mammalian EAG superfamily orthologues, including all members of the Eag and Elk gene families. The Erg family channels Kv11.2 and Kv11.3 have not yet been examined for pH sensitivity, but they also have the EAG-specific acidic residues [1832]

Tau protein and KCNH4 mRNA levels

Overexpression of tau protein lead to the reduction of KCNH4 mRNA levels in mouse neuroplastoma cells [2087]and human neuroplastoma cells [2088]

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Protein

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Structure

There are light oxygen voltage (LOV) and cyclic nucleotide binding (CNB) domains in the N and C terminus, respectively. [606]

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Distribution

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Expression

Brain (telencephalon),[809], [810] neuroblastoma, esophagus, oligodendroglioma, lung, primary B-cell neoplasia, cerebellum, pituitary gland [795].

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Functional

Angiogenesis

ELK3 suppresses angiogenesis by inhibiting the transcriptional activity of ETS-1 on MT1-MMP [1760]

Ovarian Cancer influenced by Angiogenesis

MiR-378 was overexpressed in ovarian cancer cells and tumors vs. normal ovarian epithelial cells. Overexpressing miR-378 in ovarian cancer cells altered expression of genes associated with angiogenesis (ALCAM, EHD1, ELK3, TLN1), apoptosis (RPN2, HIPK3), and cell cycle regulation (SWAP-70, LSM14A, RDX) [1761]

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