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Biosci Biotechnol Biochem. 2011;75(9):1778-82. Epub 2011 Sep 7.

Purification and characterization of a novel (R)-imine reductase from Streptomyces sp. GF3587.

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  • 1Department of Biomolecular Science, Faculty of Engineering, Gifu University.


The (R)-imine reductase (RIR) of Streptomyces sp. GF3587 was purified and characterized. It was found to be a NADPH-dependent enzyme, and was found to be a homodimer consisting of 32 kDa subunits. Enzymatic reduction of 10 mM 2-methyl-1-pyrroline (2-MPN) resulted in the formation of 9.8 mM (R)-2-methylpyrrolidine ((R)-2-MP) with 99% e.e. The enzyme showed not only reduction activity for 2-MPN at neutral pH (6.5-8.0), but also oxidation activity for (R)-2-MP under alkaline pH (10-11.5) conditions. It appeared to be a sulfhydryl enzyme based on the sensitivity to sulfhydryl specific inhibitors. It was very specific to 2-MPN as substrate.

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