Journal Article

Characteristics and Physiological Function of NADP-Malic Enzyme from Wheat

Paula Casati, Claudia P. Spampinato and Carlos S. Andreo

in Plant and Cell Physiology

Published on behalf of Japanese Society of Plant Physiologists

Volume 38, issue 8, pages 928-934
Published in print January 1997 | ISSN: 0032-0781
Published online January 1997 | e-ISSN: 1471-9053 | DOI: http://dx.doi.org/10.1093/oxfordjournals.pcp.a029253
Characteristics and Physiological Function of NADP-Malic Enzyme from Wheat

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Kinetic and structural properties of NADP-malic enzyme (NADP-ME, EC 1.1.1.40) purified from stems and roots of wheat (Triticum aestivum), along with the possible physiological role of the enzyme were examined. Enzyme purification from stems sequentially involved precipitation with crystalline ammonium sulfate, anion-exchange, affinity and size exclusion chromatographies, while anion-exchange chromatography was omitted for the enzyme purification from roots. SDS-PAGE of the purified enzyme showed a single protein band with a molecular mass of 72-kDa. Enzyme activity was dependent on the presence of a bivalent metal cation, Mg2+ or Mn2+. Binding characteristics of each metal ion suggest the existence of at least two different binding sites with distinct affinities. Nonetheless, activity response to NADP+ and L-malate exhibited Michaelis-Menten behavior with Km values of 37 and 960 μM, respectively. The amount and activity of NADP-ME were increased by GSH, cellulase and macerozyme. From these results we suggest that NADP-ME of wheat could be implicated in defense-related deposition of lignin.

Keywords: C3 plant; Cellulase; GSH; Kinetic Properties; Macerozyme; Triticum aestivum

Journal Article.  0 words. 

Subjects: Biochemistry ; Molecular and Cell Biology ; Plant Sciences and Forestry

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