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Purification and Characterization of an NAD-Malic Enzyme from Bradyrhizobium japonicum A1017

ABSTRACT An NAD-malic enzyme was purified to homogeneity fromBradyrhizobium japonicum A1017, and its molecular characteristics were surveyed. The enzyme exhibited native and subunit molecular masses of 388 and 85 kDa, respectively, suggesting that it exists as a homotetramer, and was activated by metabolic intermediates in glycolysis. The role of the enzyme in bacteroids’ carbon metabolism is discussed.