Reconstruction of cysteine biosynthesis using engineered cysteine-free enzymes.

Abstract:

:Amino acid biosynthesis pathways observed in nature typically require enzymes that are made with the amino acids they produce. For example, Escherichia coli produces cysteine from serine via two enzymes that contain cysteine: serine acetyltransferase (CysE) and O-acetylserine sulfhydrylase (CysK/CysM). To solve this chicken-and-egg problem, we substituted alternate amino acids in CysE, CysK and CysM for cysteine and methionine, which are the only two sulfur-containing proteinogenic amino acids. Using a cysteine-dependent auxotrophic E. coli strain, CysE function was rescued by cysteine-free and methionine-deficient enzymes, and CysM function was rescued by cysteine-free enzymes. CysK function, however, was not rescued in either case. Enzymatic assays showed that the enzymes responsible for rescuing the function in CysE and CysM also retained their activities in vitro. Additionally, substitution of the two highly conserved methionines in CysM decreased but did not eliminate overall activity. Engineering amino acid biosynthetic enzymes to lack the so-produced amino acids can provide insights into, and perhaps eventually fully recapitulate via a synthetic approach, the biogenesis of biotic amino acids.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Fujishima K,Wang KM,Palmer JA,Abe N,Nakahigashi K,Endy D,Rothschild LJ

doi

10.1038/s41598-018-19920-y

subject

Has Abstract

pub_date

2018-01-29 00:00:00

pages

1776

issue

1

issn

2045-2322

pii

10.1038/s41598-018-19920-y

journal_volume

8

pub_type

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