Univ. Grenoble Alpes, CEA, CNRS, IBS, UMR 5075 , 71 av. Des Martyrs , 38000 Grenoble , France.
Département de Pharmacochimie Moléculaire , Univ. Grenoble Alpes, UMR 5063 CNRS, ICMG FR 2607 , 470 rue de la Chimie , 38041 Grenoble , France.
ACS Chem Biol. 2018 Aug 17;13(8):2010-2015. doi: 10.1021/acschembio.8b00559. Epub 2018 Jul 23.
A method for labeling teichoic acids in the human pathogen Streptococcus pneumoniae has been developed using a one-pot two-step metabolic labeling approach. The essential nutriment choline modified with an azido-group was incorporated and exposed at the cell surface more rapidly than it reacted with the strain promoted azide alkyne cycloaddition (SPAAC) partner also present in the medium. Once at the cell surface on teichoic acids, coupling of the azido group could then occur within 5 min by the bio-orthogonal click reaction with a DIBO-linked fluorophore. This fast and easy method allowed pulse-chase experiments and was combined with another fluorescent labeling approach to compare the insertion of teichoic acids with peptidoglycan synthesis with unprecedented temporal resolution. It has revealed that teichoic acid and peptidoglycan processes are largely concomitant, but teichoic acid insertion persists later at the division site.
已经开发出一种在人类病原体肺炎链球菌中标记磷壁酸的方法,该方法使用一锅两步代谢标记方法。用叠氮基团修饰的必需营养物胆碱更快地被掺入并暴露在细胞表面,而不是与培养基中存在的菌株促进的叠氮炔环加成(SPAAC)反应。一旦在磷壁酸上,叠氮基团的偶联可以在 5 分钟内通过与 DIBO 连接的荧光团的生物正交点击反应发生。这种快速简便的方法允许脉冲追踪实验,并与另一种荧光标记方法相结合,以前所未有的时间分辨率比较磷壁酸和肽聚糖合成的插入。结果表明,磷壁酸和肽聚糖的合成过程基本是同时进行的,但磷壁酸的插入在分裂部位持续时间更长。