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首页> 外文期刊>Journal of bacteriology >Changes in Free Amino Acid Production and Intracellular Amino Acid Pools of Bacillus licheniformis as a Function of Culture Age and Growth Media
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Changes in Free Amino Acid Production and Intracellular Amino Acid Pools of Bacillus licheniformis as a Function of Culture Age and Growth Media

机译:地衣芽孢杆菌游离氨基酸产量和细胞内氨基酸库的变化随培养年龄和生长培养基的变化

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Changes in the endogenous intracellular amino acid pool and total free amino acid production in Bacillus licheniformis grown in minimal media were investigated. The total intracellular pool increased during exponential growth and then decreased rapidly after the end of growth. Most of the amino acids were present at low concentrations, but glutamate and alanine comprised 60 to 90% of the total intracellular free amino acid at most times during the growth cycle. It was concluded that, in addition to providing monomers for protein synthesis, the intracellular amino acid pool may be maintained for the storage of energy-providing metabolic intermediates and possibly as a balance to the ionic strength of the medium. The total free amino acid production by the cell was found to be dependent upon the composition of the salts medium as well as the culture age under conditions in which the carbon and nitrogen sources were the same. A 10-fold increase in extracellular amino acid was observed as the cells changed from vegetative to sporulation metabolism, mostly due to the extrusion of intracellular amino acid. The impact of this increase upon amino acid uptake and pulse-labeling studies using unwashed cells is discussed.
机译:研究了基本培养基中生长的地衣芽孢杆菌内源性细胞内氨基酸库的变化和总游离氨基酸的产生。总细胞内池在指数生长期间增加,然后在生长结束后迅速减少。大多数氨基酸以低浓度存在,但在生长周期中的大多数时间,谷氨酸和丙氨酸占细胞内游离氨基酸总量的60%至90%。得出的结论是,除了提供用于蛋白质合成的单体外,还可以维持细胞内氨基酸库,以存储提供能量的代谢中间体,并可能与培养基的离子强度保持平衡。发现细胞产生的总游离氨基酸取决于盐培养基的组成以及在碳源和氮源相同的条件下的培养年龄。随着细胞从营养代谢转变为孢子代谢,细胞外氨基酸增加了10倍,这主要是由于细胞内氨基酸的挤出。讨论了这种增加对使用未洗涤细胞的氨基酸摄取和脉冲标记研究的影响。

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