Reduction of protease inhibitor activity by expression of a mutant Bowman-Birk gene in soybean seed

Donald Livingstone, Vadim Beilinson, Marina Kalyaeva, Monica A. Schmidt, Eliot M. Herman, Niels C. Nielsen

Research output: Contribution to journalArticlepeer-review

16 Scopus citations


A mutant Bowman-Birk gene was created that encoded an inactive high-sulfur product. It was used to transform soybean line Asgrow 3237. Transformants bearing the mutant gene were identified by GUS expression, PCR analysis, and Southern analysis. The amount of steady state mRNA from the mutant gene in the transformed plants showed that the gene was highly expressed, but the amount of message from the unmodified Bowman-Birk gene did not change detectably. Proteins synthesized at the direction of the mutant Bowman-Birk gene accumulated in seeds of the transformed plants, and there was a marked decrease in the ability of extracts prepared from these seeds to inhibit trypsin and chymotrypsin despite the presence of Kunitz trypsin inhibitor. The more prevalent mRNA from the mutant gene was considered to out-compete message from the native genes to decrease the amount of active Bowman-Birk inhibitor.

Original languageEnglish (US)
Pages (from-to)397-408
Number of pages12
JournalPlant Molecular Biology
Issue number4
StatePublished - Jul 2007
Externally publishedYes


  • Anti-nutritional
  • Bowman-Birk
  • Glycine max
  • Kunitz
  • Soybean
  • Transgenic

ASJC Scopus subject areas

  • Genetics
  • Agronomy and Crop Science
  • Plant Science


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