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Peptidases and amino acid catabolism in lactic acid bacteria

机译:乳酸细菌中的肽酶和氨基酸分解代谢

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The conversion of peptides to free amino acids and their subsequent utilization is a central metabolic activity in prokaryotes. At least 16 peptidases from lactic acid bacteria (LAB) have been characterized biochemically and/or genetically. Among LAB, the peptidase systems of Lactobacillus helveticus and Lactococcus lactis have been examined in greatest detail. While there are homologous enzymes common to both systems, significant differences exist in the peptidase complement of these organisms. The characterization of single and multiple peptidase mutants indicate that these strains generally exhibit reduced specific growth rates in milk compared to the parental strains. LAB can also catabolize amino acids produced by peptide hydrolysis. While the catabolism of amino acids such as Arg. Thr, and His is well understood, few other amino aicd catabolic pathways from lactic acid bacteria have been characterized iin significant detail. Increasing research attention is being directed toward elucidating these pathways as well as characterizing their physiological and industrial significance.
机译:将肽转化为游离氨基酸及其随后的使用是原核生物中的中央代谢活性。来自乳酸菌(实验室)的至少16个肽酶已经表征生物化学和/或遗传学。在实验室中,已经以最大的细节检查了乳杆菌Helveticus和乳酸乳酸乳乳杆菌的肽酶系统。虽然两个系统共同的同源酶,但这些生物的肽酶补充剂中存在显着差异。单一和多种肽酶突变体的表征表明,与父母菌株相比,这些菌株通常表现出降低的牛奶的生长速率。实验室还可以将肽水解产生的氨基酸分解成氨基酸。虽然氨基酸如氨基酸的分解代谢。 THR和他很了解,很少有其他来自乳酸菌的氨基AICD分解代谢途径已经表征了IIN显着细节。越来越多的研究注意力正在阐明这些途径,并表征他们的生理和工业意义。

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