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日本根瘤菌类菌体对代谢物的主动吸收与被动吸收的评估。

Evaluation of active versus passive uptake of metabolites by Rhizobium japonicum bacteroids.

作者信息

Reibach P H, Streeter J G

出版信息

J Bacteriol. 1984 Jul;159(1):47-52. doi: 10.1128/jb.159.1.47-52.1984.

Abstract

Rhizobium japonicum bacteroids were isolated anaerobically from soybean [Glycine max (L.) Merr] nodules. The bacteroids, which were capable of acetylene reduction and respiration, were used to study the uptake of metabolites by a method which permits correction for nonspecific adsorption of metabolites and estimation of total cell volume. These determinations permit active uptake to be assessed from metabolite accumulation against a concentration gradient. Succinate, malate, alpha-ketoglutarate, and glutamate were absorbed via an active mechanism. Plots of 1/V versus 1/[S] for succinate and malate indicated the presence of two uptake components: a saturable and presumably active or carrier-mediated component and a nonsaturable and presumably passive component. The uptake of glucose, malonate, D-pinitol, myo-inositol, and glucose 6-phosphate was slow and not active.

摘要

从大豆[Glycine max (L.) Merr]根瘤中厌氧分离出日本根瘤菌类菌体。这些能够进行乙炔还原和呼吸作用的类菌体,被用于通过一种方法研究代谢物的摄取,该方法允许校正代谢物的非特异性吸附并估计总细胞体积。这些测定使得能够根据代谢物逆浓度梯度的积累来评估主动摄取。琥珀酸、苹果酸、α-酮戊二酸和谷氨酸通过主动机制被吸收。琥珀酸和苹果酸的1/V对1/[S]的图表明存在两种摄取成分:一种可饱和的、可能是主动的或载体介导的成分,以及一种不饱和的、可能是被动的成分。葡萄糖、丙二酸、D-松醇、肌醇和6-磷酸葡萄糖的摄取缓慢且无活性。

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