Synthesis of Bacillithiol and the Catalytic Selectivity of FosB-Type Fosfomycin Resistance Proteins
作者:Alexander P. Lamers、Mary E. Keithly、Kwangho Kim、Paul D. Cook、Donald F. Stec、Kelly M. Hines、Gary A. Sulikowski、Richard N. Armstrong
DOI:10.1021/ol302327t
日期:2012.10.19
Bacillithiol (BSH) has been prepared on the gram scale from the inexpensive starting material, D-glucosamine hydrochloride, in 11 steps and 8-9% overall yield. The BSH was used to survey the substrate and metal-ion selectivity of FosB enzymes from four Gram-positive microorganisms associated with the deactivation of the antibiotic fosfomycin. The in vitro results indicate that the preferred thiol substrate and metal ion for the FosB from Staphylococcus aureus are BSH and Ni(II), respectively. However, the metal-ion selectivity is less distinct with FosB from Bacillus subtilis, Bacillus anthracis, or Bacillus cereus.
Chemical and Chemoenzymatic Syntheses of Bacillithiol: A Unique Low-Molecular-Weight Thiol amongst Low G + C Gram-Positive Bacteria
作者:Sunil V. Sharma、Vishnu K. Jothivasan、Gerald L. Newton、Heather Upton、Judy I. Wakabayashi、Melissa G. Kane、Alexandra A. Roberts、Mamta Rawat、James J. La Clair、Chris J. Hamilton
DOI:10.1002/anie.201100196
日期:2011.7.25
The full monty: The recently discovered thiol cofactor bacillithiol (BSH), its biosynthetic precursors, and its symmetrical disulfide are prepared in two ways. The fosfomycin resistance protein (FosB) is shown to be a BSH‐utilizing enzyme. It displays bacillithiol‐S‐transferase activity with a strong preference for BSH over L‐cysteine as its thiol substrate.