Channels selective for potassium or chloride ions are present in all intracellular membranes such as mitochondrial membranes, sarcoplasmic/endoplasmic reticulum, nuclear membrane and chromaffin granule membranes. They probably play an important role in events such as acidification of intracellular compartments and regulation of organelle volume. Additionally, intracellular ion channels are targets for pharmacologically active compounds, e.g. mitochondrial potassium channels interact with potassium channel openers such as diazoxide. This review describes current observations concerning the properties and functional roles of intracellular potassium and chloride channels.
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The purpose of this article is to provide a concise overview of the characterization of auxotrophic mutated cells to the precursors of lipid synthesis, and of the identification of specific genes encoding enzymatic proteins involved in this process. The focus is on enzymes catalyzing the synthesis of phosphatidylserine and phosphatidylethanolamine in Saccharomyces cerevisiae and Chinese hamster ovary cells, two cell types frequently used by investigators studying the mechanisms of genetic control of metabolic processes.
The purpose of this article is to provide a concise overview of the characterization of auxotrophic mutated cells to the precursors of lipid synthesis, and of the identification of specific genes encoding enzymatic proteins involved in this process. The focus is on enzymes catalyzing the synthesis of phosphatidylserine and phosphatidylethanolamine in Saccharomyces cerevisiae and Chinese hamster ovary cells, two cell types frequently used by investigators studying the mechanisms of genetic control of metabolic processes.
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