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• W1824067573 startingPage "527" @default.
• W1824067573 abstract "To investigate the mechanisms regulating polarized vesicle delivery to the cell surface in hepatocytes, we have characterized the endogenous plasma membrane (PM)-associated syntaxins. These integral membrane proteins are components of the membrane docking/fusion apparatus and are thought to function as vesicle receptors at the PM. In hepatocytes, the PM is divided into two domains, the apical and basolateral. If syntaxins are mediating the specific recognition of vesicles delivered to either membrane surface, the simple prediction is that each domain expresses one syntaxin isoform. However, we report that rat hepatocytes express three endogenous PM-associated syntaxin isoforms, syntaxins 2, 3 and 4. By biochemical subfractionation, we determined that the syntaxins exhibit distinct, but overlapping patterns of expression among the PM domains. Syntaxin 4 is primarily expressed at the basolateral surface while syntaxins 2 and 3 are enriched at the apical PM. The immunolocalization of syntaxins 2 and 4 in rat hepatocytes and PM sheets revealed similarly complex patterns of PM expression with enhanced apical staining for both. A significant proportion of syntaxin 3 (25%) was detected in subcellular fractions containing transport vesicles. We have used quantitative immunoblotting to determine that the syntaxins are relatively abundant PM molecules (11-260 nM) in rat liver, spleen and kidney. Also, we determined that the syntaxin binding protein, Munc-18, is present at concentrations from 1.5-20 nM in the same tissues. Although this fundamental quantitative and morphological information is lacking in other systems, it is critical not only for defining syntaxin function, but also for predicting the specific mechanisms that regulate vesicle targeting in hepatocytes and other tissues." @default.
• W1824067573 created "2016-06-24" @default.
• W1824067573 creator A5021159101 @default.
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• W1824067573 creator A5085395613 @default.
• W1824067573 date "1998-02-01" @default.
• W1824067573 modified "2023-10-16" @default.
• W1824067573 title "Endogenous syntaxins 2, 3 and 4 exhibit distinct but overlapping patterns of expression at the hepatocyte plasma membrane" @default.
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• W1824067573 doi "https://doi.org/10.1042/bj3290527" @default.
• W1824067573 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/1219073" @default.
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• W1824067573 hasPublicationYear "1998" @default.
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