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Nicotinamidase activity is important for germination.

Lee Hunt1, Michael J Holdsworth, Julie E Gray

  • 1Department of Molecular Biology and Biotechnology, University of Sheffield, Sheffield S10 2TN, UK.

The Plant Journal : for Cell and Molecular Biology
|June 26, 2007
PubMed
Summary
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Nicotinamide metabolism in Arabidopsis seeds is crucial for germination. The NIC2 gene encodes an enzyme that degrades nicotinamide, enabling DNA repair and proper germination.

Area of Science:

  • Plant Biology
  • Molecular Biology
  • Biochemistry

Background:

  • Nicotinamide degradation during seed germination was previously uncharacterized.
  • The specific enzyme and its physiological function remained unknown.

Purpose of the Study:

  • To identify the enzyme responsible for nicotinamide degradation in Arabidopsis seeds.
  • To elucidate the physiological role of nicotinamide metabolism in seed germination and DNA repair.

Main Methods:

  • Identification and characterization of the Arabidopsis NIC2 gene and its encoded nicotinamidase.
  • Analysis of a nic2-1 knockout mutant for germination phenotypes, enzyme activity, and poly(ADP-ribose) levels.
  • Assessment of DNA repair response using methyl methanesulphonate (MMS) sensitivity.

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Main Results:

  • The NIC2 gene encodes a nicotinamidase essential for normal seed germination.
  • nic2-1 mutants exhibit retarded germination, reduced nicotinamidase activity, and impaired DNA repair.
  • Nicotinamide accumulation in nic2-1 mutants inhibits poly(ADP-ribose) polymerases (PARP) involved in DNA repair.

Conclusions:

  • NIC2-mediated nicotinamide metabolism is critical for relieving PARP inhibition during seed dormancy.
  • Metabolic activation of NIC2 during after-ripening or moist chilling facilitates DNA repair, promoting germination.
  • This pathway highlights a novel link between primary metabolism and DNA repair in plant development.