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Related Experiment Videos

Upstream regulatory sequences from two beta-conglycinin genes

P A Lessard1, R D Allen, T Fujiwara

  • 1Department of Biology, Washington University, St. Louis, MO 63130.

Plant Molecular Biology
|August 1, 1993
PubMed
Summary

Soybean seed storage protein gene regulation differs between alpha

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Area of Science:

  • Plant molecular biology
  • Gene regulation
  • Seed development

Background:

  • Soybean beta-conglycinin seed storage proteins are encoded by a gene family with distinct regulatory mechanisms for alpha'/alpha and beta subunits.
  • A seed-specific transcriptional enhancer upstream of the alpha' subunit gene was previously identified.
  • Understanding these regulatory differences is crucial for controlling seed composition and yield.

Purpose of the Study:

  • To identify functional components of the transcriptional enhancer for the soybean alpha' subunit gene.
  • To identify regulatory elements controlling the expression of the soybean beta subunit gene.
  • To investigate the role of specific DNA sequences and nuclear factors in regulating soybean seed protein gene expression.

Main Methods:

  • Site-directed mutagenesis within the alpha' subunit gene enhancer region.
  • Analysis of enhancer activity in transgenic plants.
  • 5' terminal deletions of the beta subunit gene to identify regulatory elements.
  • In vitro binding assays using nuclear factors SEF4 and SEF1.

Main Results:

  • A 62 bp region (-77 to -140) of the alpha' enhancer contains a vicilin box and binds SEF4.
  • A second region (-246) with legumin box homology affects alpha' enhancer activity.
  • Two regulatory regions (-553 to -442 and -308 to -72) upstream of the beta subunit gene were identified, binding SEF4.
  • The distal beta subunit regulatory element also binds SEF1 and contains an AT-rich segment.

Conclusions:

  • Distinct regulatory elements and nuclear factor interactions control soybean alpha' and beta subunit gene expression.
  • The vicilin box and SEF4 binding site are key components of the alpha' enhancer.
  • SEF4 and SEF1 play crucial roles in regulating beta subunit gene expression through specific DNA elements.

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