N-Bromoacetylethanolamine Phosphate as a Probe for the Identification of a Liver Microsomal Glucose-6-Phosphate Transporter Peptide in Rats and Ehrlich Ascites Tumor-Bearing Mice

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• 作者：Foster ; James D. ; Stevens ; Andrew L. ; Nordlie ; Robert C.
• 刊名：Archives of Biochemistry and Biophysics
• 出版年：2000
• 出版时间：May 1, 2000
• 年：2000
• 卷：377
• 期：1
• 页码：115-121
• 全文大小：146 K

文摘

Hepatic microsomal glucose-6-phosphatase is a multicomponent system composed of substrate/product translocases and a catalytic subunit. Previously we (Foster et al. (1996) Biochim. Biophys. Acta 12, 244–254) demonstrated that N-bromoacetylethanolamine phosphate (BAEP) is a time-dependent, irreversible inhibitor of glucose-6-phosphate hydrolysis in intact but not disrupted microsomes. We proposed that BAEP manifests its inhibitory effect by binding with a glucose-6-phosphate translocase protein of the glucose-6-phosphatase system. Here we provide additional evidence that BAEP inhibits glucose-6-phosphate transport in microsomal vesicles and utilize [³²P]BAEP as an affinity label in the identification of a glucose-6-phosphate transport protein. In this study, we identify 51-kDa rat and mouse liver microsomal proteins involved in glucose-6-phosphate transport into and out of microsomal vesicles by utilizing (1) an Ehrlich ascites tumor-bearing mouse model, which displays a decreased sensitivity to the time-dependent inhibitory effect of BAEP, and (2) another glucose-6-phosphate translocase inhibitor, tosyl-lysine chloromethyl ketone, in conjunction with [³²P]BAEP as an affinity label.