Gene cloning and biochemical characterization of 4-N-trimethylaminobutyraldehyde dehydrogenase II from Pseudomonas sp. 13CM

Bari, Md. Rezaul; Hassan, Mohd Rohaizat; Akai, N.; Arima, Jiro; Mori, Nobuhiro

doi:10.1007/s11274-012-1224-x

Cited by 1 publication

(2 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…TMABA dehydrogenase activity was determined as described before (Bari et al, 2013) with slight modifications. The reaction was followed by measuring the formation of 1 mol NADH per consumed mol of TMABA photometrically at 340 nm (ε NADH = 6,220 M −1 cm −1 , d = 1 cm, 30 • C).…”

Section: Assay Of Tmaba Dehydrogenase Activity In E Coli Crude Extractsmentioning

confidence: 99%

See 1 more Smart Citation

L-Carnitine Production Through Biosensor-Guided Construction of the Neurospora crassa Biosynthesis Pathway in Escherichia coli

Kugler

Trumm

Frese

et al. 2021

Front. Bioeng. Biotechnol.

View full text Add to dashboard Cite

L-Carnitine is a bioactive compound derived from L-lysine and S-adenosyl-L-methionine, which is closely associated with the transport of long-chain fatty acids in the intermediary metabolism of eukaryotes and sought after in the pharmaceutical, food, and feed industries. The L-carnitine biosynthesis pathway has not been observed in prokaryotes, and the use of eukaryotic microorganisms as natural L-carnitine producers lacks economic viability due to complex cultivation and low titers. While biotransformation processes based on petrochemical achiral precursors have been described for bacterial hosts, fermentative de novo synthesis has not been established although it holds the potential for a sustainable and economical one-pot process using renewable feedstocks. This study describes the metabolic engineering of Escherichia coli for L-carnitine production. L-carnitine biosynthesis enzymes from the fungus Neurospora crassa that were functionally active in E. coli were identified and applied individually or in cascades to assemble and optimize a four-step L-carnitine biosynthesis pathway in this host. Pathway performance was monitored by a transcription factor-based L-carnitine biosensor. The engineered E. coli strain produced L-carnitine from supplemented L-Nε-trimethyllysine in a whole cell biotransformation, resulting in 15.9 μM carnitine found in the supernatant. Notably, this strain also produced 1.7 μM L-carnitine de novo from glycerol and ammonium as carbon and nitrogen sources through endogenous Nε-trimethyllysine. This work provides a proof of concept for the de novoL-carnitine production in E. coli, which does not depend on petrochemical synthesis of achiral precursors, but makes use of renewable feedstocks instead. To the best of our knowledge, this is the first description of L-carnitine de novo synthesis using an engineered bacterium.

show abstract

Section: Assay Of Tmaba Dehydrogenase Activity In E Coli Crude Extractsmentioning

confidence: 99%

“…In the third step, the NAD + -dependent TMABA dehydrogenase (TMABADH; EC 1.2.1.47) oxidizes TMABA to γ-butyrobetaine (γ-BB) as shown for Pseudomonas sp. 13CM (Hassan et al, 2008;Bari et al, 2013). Finally, stereoselective hydroxylation of γ-BB by γ-BB hydroxylase (γ-BBH; EC 1.14.11.1) yields L-carnitine.…”

Section: Introductionmentioning

confidence: 99%