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A novel Salvia miltiorrhiza line with orange roots reveals Sm2OGD3 as a key enzyme in tanshinone biosynthesis. This discovery enhances understanding of medicinal tanshinone compound production.

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Area of Science:

  • Plant biochemistry
  • Genomics
  • Metabolic engineering

Background:

  • Salvia miltiorrhiza is crucial for treating cardiovascular diseases, with its red roots rich in tanshinones.
  • A unique S. miltiorrhiza line (shh) exhibits orange roots, differing in tanshinone profiles.

Purpose of the Study:

  • To investigate the genetic basis for the altered tanshinone accumulation in the orange-rooted S. miltiorrhiza line.
  • To identify the enzyme responsible for the metabolic shift in tanshinone biosynthesis.

Main Methods:

  • Chromosome-level genome assembly of the shh line.
  • Comparative genomics and transcriptomics to identify genetic variations.
  • Complementation assays and in vitro enzyme activity tests.

Main Results:

  • A 1.0 kb DNA fragment deletion in Sm2OGD3 was identified in the shh line.
  • Overexpression of Sm2OGD3 restored furan D-ring tanshinone accumulation.
  • Sm2OGD3 was confirmed to function as a tanshinone 15,16-dehydrogenase.

Conclusions:

  • Sm2OGD3 is a key enzyme regulating tanshinone biosynthesis by catalyzing the conversion of specific tanshinone precursors.
  • The findings offer new insights into the metabolic pathways of important medicinal compounds in Salvia miltiorrhiza.