Characterization of Two Late-Stage Enzymes Involved in Fosfomycin Biosynthesis in Pseudomonads
作者:Philip Olivares、Emily C. Ulrich、Jonathan R. Chekan、Wilfred A. van der Donk、Satish K. Nair
DOI:10.1021/acschembio.6b00939
日期:2017.2.17
fosfomycin is currently in use for clinical treatment of infections caused by both Gram-positive and Gram-negative uropathogens. The antibiotic is biosynthesized by various streptomycetes, as well as by pseudomonads. Notably, the biosynthetic strategies used by the two genera share only two steps: the first step in which primary metabolite phosphoenolpyruvate (PEP) is converted to phosphonopyruvate (PnPy) and
Steric Enforcement of <i>cis</i>-Epoxide Formation in the Radical C–O-Coupling Reaction by Which (<i>S</i>)-2-Hydroxypropylphosphonate Epoxidase (HppE) Produces Fosfomycin
作者:Shengbin Zhou、Juan Pan、Katherine M. Davis、Irene Schaperdoth、Bo Wang、Amie K. Boal、Carsten Krebs、J. Martin Bollinger
DOI:10.1021/jacs.9b10974
日期:2019.12.26
residues - Leu120, Leu144, Phe182, and Leu193 - close to C3 in one of the complexes. Replacement of Leu193 in the substrate C3 pocket with the bulkier Phe enhances stereoselectivity (cis:trans ~ 99:1), whereas the Leu120Phe substitution in the product C3 pocket diminishes it (~ 82:18). Retention of C1 configuration and trans-epoxide formation become predominant with the bulk-reducing Phe182Ala substitution