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Lysine-ketoglutarate reductase activity in developing maize endosperm.

P Arruda1, L Sodek, W J da Silva

  • 1Department of Genetics and Evolution, Instituto de Biologia, Universidade Estadual de Campinas, 13100 Campinas, SP., Brazil.

Plant Physiology
|April 1, 1982
PubMed
Summary

This study identified and characterized lysine-ketoglutarate reductase in maize endosperm. The enzyme specifically converts lysine and alpha-ketoglutarate into saccharopine, with optimal activity near pH 7.

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Area of Science:

  • Biochemistry
  • Plant Science
  • Enzymology

Background:

  • The developing endosperm of maize (Zea mays L.) is a crucial tissue for nutrient accumulation.
  • Understanding the enzymatic pathways involved in amino acid metabolism is vital for crop improvement.

Purpose of the Study:

  • To detect and characterize the activity of lysine-ketoglutarate reductase in maize endosperm.
  • To elucidate the substrate specificity and kinetic properties of this enzyme.

Main Methods:

  • Enzyme assays were performed using developing maize endosperm.
  • Substrate specificity was tested with lysine, alpha-ketoglutarate, and NADPH.
  • Product formation (saccharopine) was monitored.
  • Enzyme kinetics, including pH optimum and K(m) values, were determined.

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Main Results:

  • Lysine-ketoglutarate reductase activity was successfully detected and characterized.
  • The enzyme demonstrated specificity for lysine, alpha-ketoglutarate, and NADPH.
  • Saccharopine was identified as the reaction product.
  • The optimal pH for enzyme activity was found to be approximately 7.
  • The Michaelis constants (K(m)) for lysine and alpha-ketoglutarate were determined as 5.2 mM and 1.8 mM, respectively.

Conclusions:

  • Lysine-ketoglutarate reductase plays a role in maize endosperm metabolism.
  • The characterized kinetic properties provide a basis for further functional studies.
  • This research contributes to understanding amino acid biosynthesis pathways in cereals.