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Substrate Tolerance of Bacterial Glycosyltransferase MurG: Novel Fluorescence-Based Assays.

Abstract：

:MurG (uridine diphosphate-N-acetylglucosamine/N-acetylmuramyl-(pentapeptide) pyrophosphoryl-undecaprenol N-acetylglucosamine transferase) is an essential bacterial glycosyltransferase that catalyzes the N-acetylglucosamine (GlcNAc) transformation of lipid I to lipid II during peptidoglycan biosynthesis. Park's nucleotide has been a convenient biochemical tool to study the function of MraY (phospho-MurNAc-(pentapeptide) translocase) and MurG; however, no fluorescent probe has been developed to differentiate individual processes in the biotransformation of Park's nucleotide to lipid II via lipid I. Herein, we report a robust assay of MurG using either the membrane fraction of a M. smegmatis strain or a thermostable MraY and MurG of Hydrogenivirga sp. as enzyme sources, along with Park's nucleotide or Park's nucleotide-Nε-C6-dansylthiourea and uridine diphosphate (UDP)-GlcN-C6-FITC as acceptor and donor substrates. Identification of both the MraY and MurG products can be performed simultaneously by HPLC in dual UV mode. Conveniently, the generated lipid II fluorescent analogue can also be quantitated via UV-Vis spectrometry without the separation of the unreacted lipid I derivative. The microplate-based assay reported here is amenable to high-throughput MurG screening. A preliminary screening of a collection of small molecules has demonstrated the robustness of the assays and resulted in rediscovery of ristocetin A as a strong antimycobacterial MurG and MraY inhibitor.

journal_name

ACS Infect Dis

journal_title

ACS infectious diseases

authors

Mitachi K,Yun HG,Gillman CD,Skorupinska-Tudek K,Swiezewska E,Clemons WM Jr,Kurosu M

doi

10.1021/acsinfecdis.9b00242

subject

Has Abstract

pub_date

2020-06-12 00:00:00

pages

1501-1516

issue

6

issn

2373-8227

journal_volume

6

pub_type

杂志文章

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