粪肠球菌细胞内和细胞外脂磷壁酸的前体-产物关系。
Precursor-product relationship of intracellular and extracellular lipoteichoic acids of Streptococcus faecium.
作者信息
Kessler R E, Shockman G D
出版信息
J Bacteriol. 1979 Feb;137(2):869-77. doi: 10.1128/jb.137.2.869-877.1979.
Abstract
Exponential biosynthesis and excretion of lipoteichoic acid (LTA) during the exponential phase of growth, and continued synthesis and excretion during valine starvation of Streptococcus faecium (S. faecalis ATCC 9790), were shown. During exponential growth, extracellular LTA (LTAx) accounted for approximately 13% of the total LTA in cultures, whereas during valine starvation, this percentage increased to approximately 60% within 4 h. LTAx was present in a low-molecular-weight, apparently deacylated form, whereas intracellular (LTAi) was present primarily in an apparently high-molecular-weight, acylated and micellar form. Experiments utilizing chases of either fully equilibrated or short pulses of [14C]- or [3H]glycerol were used to demonstrate that LTAx was derived directly from LTAi.
摘要
研究表明，在粪肠球菌（粪链球菌ATCC 9790）生长的指数期，脂磷壁酸（LTA）呈指数式生物合成和分泌，在缬氨酸饥饿期间持续合成和分泌。在指数生长期间，细胞外LTA（LTAx）约占培养物中总LTA的13%，而在缬氨酸饥饿期间，该百分比在4小时内增加到约60%。LTAx以低分子量、明显脱酰基的形式存在，而细胞内（LTAi）主要以明显高分子量、酰化和胶束形式存在。利用[14C] - 或[3H]甘油的完全平衡或短脉冲追踪实验证明，LTAx直接来源于LTAi。
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