Konings W N, Otto R
Antonie Van Leeuwenhoek. 1983 Sep;49(3):247-57. doi: 10.1007/BF00399501.
Metabolic energy in lactic streptococci can be generated by substrate level phosphorylation and by efflux of end-products in symport with protons. During growth on lactose or glucose Streptococcus cremoris maintains a high proton motive force and phosphate potential. Both energy intermediates dissipate rapidly when the energy supply stops. In the initial phase of starvation the internal phosphoenolpyruvate (PEP) pool increases rapidly and this enables the organism for a prolonged period during starvation to accumulate the energy source via a PEP-dependent uptake system.
乳酸链球菌中的代谢能量可以通过底物水平磷酸化以及通过与质子协同转运的终产物外流来产生。在以乳糖或葡萄糖为生长底物时，嗜热链球菌维持较高的质子动力势和磷酸盐势。当能量供应停止时，这两种能量中间体都会迅速耗散。在饥饿的初始阶段，细胞内磷酸烯醇式丙酮酸（PEP）池迅速增加，这使得该生物体在饥饿期间能够通过依赖PEP的摄取系统长时间积累能量源。
