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Acta Crystallogr F Struct Biol Commun. 2014 Aug;70(Pt 8):1046-8. doi: 10.1107/S2053230X14012606. Epub 2014 Jul 23.

Cloning, expression, purification, crystallization and X-ray crystallographic analysis of D-lactate dehydrogenase from Lactobacillus jensenii.

Author information

1
Structural and Molecular Biology Laboratory, School of Life Sciences and Biotechnology, Kyungpook National University, Daehak-ro 80, Buk-gu, Daegu 702-701, Republic of Korea.
2
Department of Chemical Engineering, Kwangwoon University, Seoul 139-701, Republic of Korea.

Abstract

The thermostable D-lactate dehydrogenase from Lactobacillus jensenii (LjD-LDH) is a key enzyme for the production of the D-form of lactic acid from pyruvate concomitant with the oxidation of NADH to NAD(+). The polymers of lactic acid are used as biodegradable bioplastics. The LjD-LDH protein was crystallized using the hanging-drop vapour-diffusion method in the presence of 28%(w/v) polyethylene glycol 400, 100 mM Tris-HCl pH 9, 200 mM magnesium sulfate at 295 K. X-ray diffraction data were collected to a maximum resolution of 2.1 Å. The crystal belonged to space group P3121, with unit-cell parameters a = b = 90.5, c = 157.8 Å. With two molecules per asymmetric unit, the crystal volume per unit protein weight (VM) is 2.58 Å(3) Da(-1), which corresponds to a solvent content of approximately 52.3%. The structure was solved by single-wavelength anomalous dispersion using a selenomethionine derivative.

KEYWORDS:

Lactobacillus jensenii; bioplastics; d-lactate dehydrogenase; polylactic acid

PMID:
25084378
PMCID:
PMC4118800
DOI:
10.1107/S2053230X14012606
[Indexed for MEDLINE]
Free PMC Article

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