Department of Microbiology, Institute of Pharmacy, University of Oslo, Blindern, Norway.
The N-terminal sequences of malate dehydrogenases from 10 bacterial strains, representing seven genera of Proteobacteria, were determined. Of these, the enzyme sequences of species classified in the genus Brevundimonas clearly resembled those malate dehydrogenases with greatest similarity to lactate dehydrogenases. Additional evidence from subunit molecular weights, peptide mapping, and enzyme mobilities suggested that malate dehydrogenases from species of the genus Brevundimonas were structurally distinct from others in the study.