1887

Abstract

Summary: The composition of membranes from whole cells and minicells of strain BD474 was examined. Two-dimensional electrophoresis showed that the content of several individual polypeptides differed in the two membrane types. Whole cell membranes appeared to contain more penicillin binding protein (PBP) 2a. glycerol-3-phosphate dehydrogenase, succinate dehydrogenase and NADH dehydrogenase than minicell membranes, but less PBP2b, lactate dehydrogenase and malate dehydrogenase. Glycerol-3-phosphate dehydrogenase and succinate dehydrogenase were unstable, but the other enzymes and PBPs were stable after inhibition of protein synthesis by chloramphenicol. Minicells synthesized peptidoglycan because they incorporated C-labelled acetylglucosamine into acid precipitable material. However, the rate of incorporation in minicells was only 5% of the value observed in whole cells. Whole cell and minicell membranes contained the same polar lipids and fatty acids, but the whole cell membranes were enriched in phosphatidylglycerol, diglycosyldiacylglycerol, -C and -C fatty acids, but depleted of phosphatidylethanolamine, -C, -C, -C and -C fatty acids.

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/content/journal/micro/10.1099/00221287-131-2-345
1985-02-01
2020-10-24
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http://instance.metastore.ingenta.com/content/journal/micro/10.1099/00221287-131-2-345
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