Molecular cloning and expression in Escherichia coli of a cyanobacterial gene coding for phytoene synthase, a carotenoid biosynthesis enzyme

Daniel Chamovitz, Norihiko Misawa, Gerhard Sandmann, Joseph Hirschberg

Research output: Contribution to journalArticlepeer-review

66 Scopus citations

Abstract

The first committed step in the biosynthetic pathway of carotenoids in plants and algae is the conversion of geranylgeranyl pyrophosphate (GGPP) to prephytoene pyrophosphate (PPPP), which is converted to phytoene. We have cloned the gene pys that encodes the enzyme phytoene synthase in the cyanobacterium Synechococcus PCC7942. The co-expression of pys in cells of Escherichia coli together with the gene crtE from Erwinia uredovora, which encodes geranylgeranyl pyrophosphate synthase, resulted in accumulation of phytoene. This result indicates that phytoene synthase is a single polypeptide enzyme that catalyzes the 2-step reaction from GGPP to phytoene. The deduced amino acid sequence of pys is highly conserved with that of pTOM5, a tomato cDNA that is differentially expressed during fruit ripening. These findings suggest that pTOM5 encodes phytoene synthase in tomato.

Original languageEnglish
Pages (from-to)305-310
Number of pages6
JournalFEBS Letters
Volume296
Issue number3
DOIs
StatePublished - 27 Jan 1992
Externally publishedYes

Keywords

  • Carotenoid
  • Erwinia uredovora, Phytoene
  • Synechococcus PCC7942
  • Tomato

ASJC Scopus subject areas

  • Biophysics
  • Structural Biology
  • Biochemistry
  • Molecular Biology
  • Genetics
  • Cell Biology

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