Journal of Bacteriology, January 2001, p. 397-400, Vol. 183, No. 1
0021-9193/01/$04.00+0 DOI: 10.1128/JB.183.1.397-400.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.
Department of Applied Biological Science, Faculty of Science and Technology, Science University of Tokyo, 2641 Yamazaki, Noda, Chiba 278-8510,1 and Department of Biotechnology, The University of Tokyo, Bunkyo-ku, Tokyo 113-8657,2 Japan
Received 23 May 2000/Accepted 6 October 2000
The nonallosteric and allosteric L-lactate dehydrogenases of Lactobacillus pentosus and L. casei, respectively, exhibited broad substrate specificities, giving virtually the same maximal reaction velocity and substrate Km values for pyruvate and oxaloacetate. Replacement of Pro101 with Asn reduced the activity of the L. pentosus enzyme toward these alternative substrates to a greater extent than the activity toward pyruvate.
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