Expression, purification, crystallization and X-ray analysis of 3-quinuclidinone reductase from Agrobacterium tumefaciens.

ABSTRACT: (R)-3-Quinuclidinol is a useful chiral building block for the synthesis of various pharmaceuticals and can be produced from 3-quinuclidinone by asymmetric reduction. A novel 3-quinuclidinone reductase from Agrobacterium tumefaciens (AtQR) catalyzes the stereospecific reduction of 3-quinuclidinone to (R)-3-quinuclidinol with NADH as a cofactor. Recombinant AtQR was overexpressed in Escherichia coli, purified and crystallized with NADH using the sitting-drop vapour-diffusion method at 293?K. Crystals were obtained using a reservoir solution containing PEG 3350 as a precipitant. X-ray diffraction data were collected to 1.72?Å resolution on beamline BL-5A at the Photon Factory. The crystal belonged to space group P2(1), with unit-cell parameters a = 62.0, b = 126.4, c = 62.0?Å, ? = 110.5°, and was suggested to contain four molecules in the asymmetric unit (V(M) = 2.08?Å(3)?Da(-1)).

SUBMITTER: Hou F 

PROVIDER: S-EPMC3497986 | biostudies-literature | 2012 Oct

REPOSITORIES: biostudies-literature