Abstract
A five-step procedure was used to obtain electrophoretically pure preparations of malate dehydrogenase (EC 1.1.1.37) from Rhodobacter sphaeroides and Rhodopseudomonas palustris. The procedure included extraction, ammonium sulfate fractionation, gel filtration, and ion exchange and gel permeation chromatography. The enzyme was found to exist in two isoforms, dimeric and tetrameric, formed by the oligomerization of identical subunits. The isoforms are assumed to be involved in different metabolic processes.
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