Get Biomembranes Part U: Cellular and Subcellular Transport: PDF

By Sidney Fleischer, Becca Fleischer (Eds.)

ISBN-10: 0121820750

ISBN-13: 9780121820756

The severely acclaimed laboratory normal, Methods in Enzymology, is without doubt one of the such a lot hugely revered courses within the box of biochemistry. due to the fact that 1955, every one quantity has been eagerly awaited, usually consulted, and praised via researchers and reviewers alike. The sequence comprises a lot fabric nonetheless appropriate at the present time - actually a vital book for researchers in all fields of existence sciences

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Extra resources for Biomembranes Part U: Cellular and Subcellular Transport: Eukaryotic (Nonepithelial) Cells

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H. Williamson, O. Lopes Vereira, and B. Walker, Biochem. J. 104, 497 (1967). 7 R. van der Meet and J. M. Tager, FEBSLett. 67, 36 (1976). s H. J. Sips, A. K. Groen, andJ. M. Tager, FEBSLett. 119, 271 (1980). [4] HEPATOCYTE ALANINE TRANSPORT 35 alanine in the physiological range, and the addition of aminooxyacetate greatly increased the intracellular to extracellular concentration ratio. 5 raM). s-m There is less agreement about the limitation of metabolism by transport at higher concentrations of alanine.

Role of Alanine Transport in Regulation of Alanine Metabolism The transport of alanine across the cell plasma membrane is the first reaction in alanine metabolism, and it is of importance to determine whether there are conditions under which the rate of transport is rate-limiting for the subsequent metabolism of this amino acid. Identification of transport as a rate-limiting step requires the fulfilment of a number of criteria: (1) The rate of transport, measured in the absence of metabolism, must approximate the rate of alanine metabolism at the same alanine concentration.

Among those tested, only ~,-methylene I~L-glutamate and a-methyl DL-glutamate showed significant interactions with the glutamate translocator. Modification of the functional groups of glutamate, namely, the aamino group or the 7-carboxyl group, abolishes the ability to interact with the glutamate binding site of the translocator; such modifications fail to inhibit glutamate uptake. These modified agents include L-glutamine, glutarate, ~-methyl or ethyl L-glutamate, a-ketoglutarate, N-methyl L-glutamate, L-glutamic acid dimethyl ester, L-glutamic acid diethyl ester, 2amino-4-phosphonobutyrate, and L-homocysteate.

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Biomembranes Part U: Cellular and Subcellular Transport: Eukaryotic (Nonepithelial) Cells by Sidney Fleischer, Becca Fleischer (Eds.)

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