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Molecular cloning of a human, hemicholinium-3-sensitive choline transporter.

Abstract：

:Under many physiological circumstances, Na(+)- and Cl(-)-dependent, hemicholinium-3 (HC-3)-sensitive, high-affinity choline uptake (HACU) in cholinergic neurons is thought to be rate-limiting in the biosynthesis of acetylcholine (ACh). Based on sequence information provided by the Human Genome Project and the recently reported rat CHT1 (rCHT1), we cloned a human CHT cDNA from spinal cord. The hCHT cDNA encodes a protein of 580 amino acids having 93% identity to rCHT1 and 51% identity to the Caenorhabditis elegans homolog CHO-1, and is distantly related to members of the Na(+)-coupled glucose transporter (SGLT) gene family of Na(+)-coupled glucose (SGLT), nucleoside and iodide transporters. Northern blot analysis reveals the expression of a approximately 5 kb transcript in human brain regions rich in cholinergic neurons including the putamen, spinal cord, and medulla. Expression of hCHT cDNA in COS-7 cells results in saturable, Na(+)/Cl(-)-dependent choline uptake (K(m) = 1.2 microM) in membrane vesicles and [(3)H] HC-3 binding (K(d) = 4 nM) in membrane fractions, consistent with characteristics reported in mammalian cholinergic neurons. Using radiation hybrid mapping techniques, we localized the hCHT gene to human chromosome 2q12. These studies elucidate the primary structure and chromosomal localization of hCHT and provide a basis for mechanistic analysis of HACU regulation and an investigation of the role of hCHT in disease states.

journal_name

Biochem Biophys Res Commun

journal_title

Biochemical and biophysical research communications

authors

Apparsundaram S,Ferguson SM,George AL Jr,Blakely RD

doi

10.1006/bbrc.2000.3561

subject

Has Abstract

pub_date

2000-10-05 00:00:00

pages

862-7

issue

3

eissn

0006-291X

issn

1090-2104

pii

S0006-291X(00)93561-7

journal_volume

276

pub_type

杂志文章

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