首页> 美国卫生研究院文献>Applied and Environmental Microbiology >Inhibition by Peptides of Amino Acid Uptake by Bacterial Populations in Natural Waters: Implications for the Regulation of Amino Acid Transport and Incorporation
【2h】

Inhibition by Peptides of Amino Acid Uptake by Bacterial Populations in Natural Waters: Implications for the Regulation of Amino Acid Transport and Incorporation

机译:天然水中细菌种群对氨基酸的吸收对肽的抑制作用:氨基酸运输和纳入的规管的含义。

代理获取
本网站仅为用户提供外文OA文献查询和代理获取服务,本网站没有原文。下单后我们将采用程序或人工为您竭诚获取高质量的原文,但由于OA文献来源多样且变更频繁,仍可能出现获取不到、文献不完整或与标题不符等情况,如果获取不到我们将提供退款服务。请知悉。

摘要

To investigate the regulatory interactions of amino acid transport and incorporation, we determined the effects of dipeptides on amino acid uptake by bacteria in an estuary and a freshwater lake. Dipeptides noncompetitively inhibited net transport and incorporation of amino acids into macromolecules but had no effect on the ratio of respiration to incorporation. Nearly maximum inhibition occurred at peptide concentrations of <10 nM. In contrast, the initial uptake rate of glycyl-[14C]phenylalanine was not affected by glycine or phenylalanine. Net amino acid transport appeared to be inhibited by the increased flux into the intracellular pools, whereas the incorporation of labeled monomers into macromolecules was isotopically diluted by the unlabeled amino acids resulting from intracellular hydrolysis of the dipeptide. Chloramphenicol, sodium azide, and dinitrophenol all inhibited the initial uptake rate of leucine and phenylalanine. These results suggest that in aquatic environments amino acids are taken up by active transport which is coupled closely to protein synthesis.
机译:为了研究氨基酸转运和掺入的调节相互作用,我们确定了二肽对河口和淡水湖泊中细菌摄​​取氨基酸的影响。二肽非竞争性地抑制氨基酸的净运输和掺入大分子,但对呼吸与掺入的比例没有影响。在<10 nM的肽浓度下,几乎达到最大抑制作用。相反,甘氨酸-[ 14 C]苯丙氨酸的初始摄取速率不受甘氨酸或苯丙氨酸的影响。净氨基酸转运似乎受到通入细胞内池的通量增加的抑制,而被标记单体掺入大分子中则被二肽细胞内水解产生的未标记氨基酸同位素稀释。氯霉素,叠氮化钠和二硝基苯酚均抑制了亮氨酸和苯丙氨酸的初始摄取速率。这些结果表明,在水生环境中,氨基酸被与蛋白质合成密切相关的主动转运吸收。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
代理获取

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号