Plant Molecular Biology

, Volume 27, Issue 5, pp 863–874

Characterization of a new myrosinase in Brassica napus

  • Anders Falk
  • Bo Ek
  • Lars Rask
Article

DOI: 10.1007/BF00037015

Cite this article as:
Falk, A., Ek, B. & Rask, L. Plant Mol Biol (1995) 27: 863. doi:10.1007/BF00037015

Abstract

A full-length cDNA clone defining the new myrosinase gene family MC in Brassica napus was isolated and sequenced. Southern hybridization showed that the MC family probably consists of 3 or 4 genes in B. napus. MC genes are expressed in the developing seed, but not in the vegetative tissues investigated. In situ hybridizations to developing seeds showed that the MC genes are expressed in the myrosin cells of the embryo axis and the cotyledons. Complexes with myrosinase and myrosinase-binding protein (MBP) were purified and characterized. Sequencing of peptides from myrosinases occurring in the complexes showed that the 70 kDa myrosinase is encoded by the MC genes, whereas the 65 kDa myrosinase is encoded by the MB genes. This is in contrast to the 75 kDa myrosinase which occurs in free form and is encoded by the MA genes. Deglycosylations of the myrosinase complexes and the free myrosinase showed that the molecular sizes of the myrosinases could be reduced significantly by this treatment, and that the size differences between the different myrosinases are mainly due to differences in glycosylation.

Key words

Brassica napus glucosinolates myrosinase thioglucoside glucohydrolase 

Copyright information

© Kluwer Academic Publishers 1995

Authors and Affiliations

  • Anders Falk
    • 1
  • Bo Ek
    • 1
  • Lars Rask
    • 1
  1. 1.Uppsala Genetic Center, Department of Cell ResearchSwedish University of Agricultural SciencesUppsalaSweden

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