Kozitskaia S N, Gavriliuk V G, Golodok L P, Vinnikov A I
Mikrobiol Z. 1997 Jan-Feb;59(1):37-41.
Activity of a number of enzymes participating in the processes of structure metabolism and dynamics of inclusion of 14C-aspartate in initial strain of Staphylococcus aureus sensitive to antibiotics and strains containing plasmids of resistance to various antibiotics have been comparatively studied. An increase in activity of fumarate-hydratase, acetyl-KoA-carboxylase, aspartate aminotransferase and well as true increases (by the rate of inclusion of 14C-aspartate in a number of strains containing plasmids) of resistance to antibiotics as compared to plasmid-less variant are shown. This evidence for strengthening of biosynthetic function of a cycle of tricarbonic acids and, allowing for extremely low activity of alpha-ketoglutarate dehydrogenase, one can suppose that an open cycle of tricarbonic acids functions in the given strain of staphylococcus. The increase of the level of acetyl-KoA-carboxylase activity evidences for the intensification of lipid synthesis in antibiotic-resistant staphylococci as compared to the sensitive variants.
对参与结构代谢过程以及14C-天冬氨酸掺入对多种抗生素敏感的金黄色葡萄球菌原始菌株和含有各种抗生素抗性质粒的菌株的动力学过程的多种酶的活性进行了比较研究。结果表明,与无质粒变体相比,富马酸水合酶、乙酰辅酶A羧化酶、天冬氨酸转氨酶的活性增加,并且一些含有质粒的菌株中对14C-天冬氨酸的掺入率确实增加了对多种抗生素的抗性。这证明三羧酸循环的生物合成功能增强,考虑到α-酮戊二酸脱氢酶的活性极低,可以推测在给定的葡萄球菌菌株中存在三羧酸开放循环。与敏感变体相比,乙酰辅酶A羧化酶活性水平的增加证明了抗抗生素葡萄球菌中脂质合成的增强。