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Coxsackie virus and adenovirus receptor
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Coxsackie virus and adenovirus receptor : ウィキペディア英語版
Coxsackie virus and adenovirus receptor

Coxsackievirus and adenovirus receptor (CAR) is a protein that in humans is encoded by the ''CXADR'' gene.〔(【引用サイトリンク】 url = http://www.ncbi.nlm.nih.gov/sites/entrez?Db=gene&Cmd=ShowDetailView&TermToSearch=1525 )〕 The protein encoded by this gene is a type I membrane receptor for group B coxsackie viruses and subgroup C adenoviruses. CAR protein is expressed in several tissues, including heart, brain, and, more generally, epithelial and endothelial cells. In cardiac muscle, CAR is localized to intercalated disc structures, which electrically and mechanically couple adjacent cardiomyocytes. CAR plays an important role in the pathogenesis of myocarditis, dilated cardiomyopathy, and in arrhythmia susceptibility following myocardial infarction or myocardial ischemia.
== Structure ==

Human CAR protein has a theoretical molecular weight of 40.0 kDa and is composed of 365 amino acids.〔(【引用サイトリンク】url=http://www.heartproteome.org/copa/ProteinInfo.aspx?QType=Protein%20ID&QValue=P78310 )〕 The human CAR gene (CXADR) is found on chromosome 21. Alternative splicing is known to produce at least 2 splice variants known as hCAR1 and hCAR2 and are each composed of at least 7 exons. Pseudogenes of this gene are found on chromosomes 15, 18, and 21.〔
CAR is a transmembrane bound protein with two Ig-like extracellular domains, a transmembrane domain, a cytoplasmic domain, and two N-linked glycosylation sites. CAR contains two disulfide bonded loops (residues 35-130 and 155-220). The N-terminal segment comprises the two extracellular domains (D1 and D2). D1 is most distal from the membrane and contains a V/Ig-like fold whereas D2 is more proximal. The cytoplasmic tail of CAR contains the amino acids GSIV, which is characterized as a class 1 PDZ binding motif for interacting with proteins containing PDZ domains.
The protein is found to be expressed in various regions of the body including the heart, brain, and, more generally, epithelial and endothelial cells. Moreover, CAR expression is not found in normal or tumor cell lines. Expression of CAR in endothelial cells can be regulated by treatment with drugs.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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