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Association of NADP- and NAD-linked malic enzyme activities in Zea mays: relation to C4 pathway photosynthesis

, : Association of NADP- and NAD-linked malic enzyme activities in Zea mays: relation to C4 pathway photosynthesis. Archives of Biochemistry and Biophysics 179(2): 361-369

Among spp. with C4 photosynthesis, those showing high activities of NADP malic enzyme also contain significant NAD-dependent malic enzyme activity. In maize the NAD malic enzyme activity varied widely in extracts from leaves, and incubating extracts at 25 deg C increased NAD malic enzyme until the ratio NADP-:NAD-dependent activity reached 5. Properties and association during purification suggested that the 2 activities were catalyzed by the same enzyme. Pennisetum typhoides [P. americanum], Sorghum sudanense and Panicum antidotale also showed evidence of association between NADP- and NAD-dependent activities. It was concluded that the NAD-dependent activity would have no significant function in photosynthesis.


PMID: 15513

DOI: 10.1016/0003-9861(77)90123-0

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