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Related Experiment Videos

A new pathway for polyketide synthesis in microorganisms.

N Funa1, Y Ohnishi, I Fujii

  • 1Department of Biotechnology, Graduate School of Agriculture and Life Sciences, University of Tokyo, Japan.

Nature
|September 7, 1999
PubMed
Summary
This summary is machine-generated.

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The Streptomyces griseus rppA gene encodes a protein similar to plant chalcone synthases. This bacterial enzyme synthesizes polyketides, producing 1,3,6,8-tetrahydroxynaphthalene, crucial for melanin and secondary metabolite production.

Area of Science:

  • Biochemistry
  • Microbiology
  • Molecular Biology

Background:

  • Chalcone synthases (CHSs) are key plant enzymes in flavonoid biosynthesis.
  • The function of bacterial rppA-like genes, despite sequence similarity to CHSs, remained uncharacterized.

Purpose of the Study:

  • To investigate the function and catalytic properties of the rppA gene product from Streptomyces griseus.
  • To determine if bacterial enzymes possess chalcone synthase-like activity.

Main Methods:

  • Gene cloning and protein expression of rppA.
  • Enzymatic assays using malonyl-coenzyme-A as a starter molecule.
  • Site-directed mutagenesis to identify essential active site residues.
  • Gene disruption in Streptomyces griseus to assess in vivo function.

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Main Results:

  • The Streptomyces griseus RppA protein functions as a homodimer, catalyzing polyketide synthesis.
  • RppA utilizes malonyl-coenzyme-A, performs four extensions, and produces 1,3,6,8-tetrahydroxynaphthalene (THN).
  • A cysteine residue is essential for RppA activity; disruption of rppA leads to albino (melanin-deficient) Streptomyces griseus.
  • THN is an intermediate in melanin and other naphthoquinone-containing secondary metabolite biosynthesis.

Conclusions:

  • RppA is a bacterial chalcone-synthase-related enzyme responsible for polyketide synthesis.
  • This finding expands the known distribution of CHS-like enzymes beyond plants.
  • RppA plays a vital role in the biosynthesis of melanins and other secondary metabolites in Streptomyces.