NDLI: Cloning, expression, purification, and analysis of mannitol dehydrogenase gene mtlK from Lactobacillus brevis

Content Provider	Springer Nature Link
Author	Liu, Siqing Saha, Badal Cotta, Michael
Copyright Year	2005
Abstract	The commercial production of mannitol involves high-pressure hydrogenation of fructose using a nickel catalyst, a costly process. Mannitol can be produced through fermentation by microorganisms. Currently, a few Lactobacillus strains are used to develop an efficient process for mannitol bioproduction; most of the strains produce mannitol from fructose with other products. An approach toward improving this process would be to genetically engineer Lactobacillus strains to increase fructose-to-mannitol conversion with decreased production of other products. We cloned the gene mtlK encoding mannitol-2-dehydrogenase (EC 1.1.1.67) that catalyzes the conversion of fructose into mannitol from Lactobacillus brevis using genomic polymerase chain reaction. The mtlK clone contains 1328 bp of DNA sequence including a 1002-bp open reading frame that consisted of 333 amino acids with a predicted molecular mass of about 36 kDa. The functional mannitol-2-dehydrogenase was produced by overexpressing mtlK via pRSETa vector in Escherichia coli BL21pLysS on isopropyl-β-d-thiogalactopyranoside induction. The fusion protein is able to catalyze the reduction of fructose to mannitol at pH 5.35. Similar rates of catalytic reduction were observed using either the NADH or NADPH as cofactor under in vitro assay conditions. Genetically engineered Lactobacillus plantarum TF103 carrying the mtlK gene of L. brevis indicated increased mannitol production from glucose. The evaluation of mixed sugar fermentation and mannitol production by this strain is in progress.
Starting Page	391
Ending Page	401
Page Count	11
File Format	PDF
ISSN	02732289
Journal	Applied Biochemistry and Biotechnology
Volume Number	121
Issue Number	1-3
e-ISSN	15590291
Language	English
Publisher	Humana Press
Publisher Date	2005-01-01
Publisher Place	Totowa
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Biotechnology Biochemistry
Content Type	Text
Resource Type	Article
Subject	Medicine Molecular Biology Environmental Engineering Biochemistry Bioengineering Applied Microbiology and Biotechnology Biotechnology

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