Related Experiment Videos
Polyketide synthase genes from marine dinoflagellates.
R V Snyder1, P D L Gibbs, A Palacios
1Department of Chemistry, Florida International University, 11200 SW 8th St., Miami, FL 33199, USA.
Marine Biotechnology (New York, N.Y.)
|August 20, 2003
Summary
Researchers screened dinoflagellates for polyketide synthases (PKSs), finding PKS genes in most strains. These findings suggest dinoflagellates may possess novel biosynthetic capabilities for complex molecules.
Area of Science:
- Marine Biology
- Molecular Biology
- Biochemistry
Background:
- Dinoflagellate-derived polyketides are complex and unique, but their biosynthesis is poorly understood at the genomic level.
- Advancements in genomic manipulation necessitate the discovery of novel biosynthetic pathways.
Purpose of the Study:
- To investigate the presence and origin of polyketide synthase (PKS) genes in various dinoflagellate species.
- To explore the potential for novel polyketide biosynthesis in dinoflagellates.
Main Methods:
- Screening of nine dinoflagellate strains (7 species) for type I and type II PKS genes using polymerase chain reaction (PCR) and reverse transcriptase PCR.
- Amplification of bacterial 16S ribosomal RNA gene to assess bacterial presence.
- Analysis of PKS gene origin using polyadenylated RNA, light-deprivation experiments, phylogenetic signals, methylation-sensitive restriction enzymes, and bacterial isolate hybridization.
Main Results:
- Seven out of nine dinoflagellate strains yielded PCR products homologous to known and putative type I PKSs.
- A PKS gene was unexpectedly amplified from *Gymnodinium catenatum*, a saxitoxin producer not previously known for polyketide production.
- While bacterial 16S rRNA genes were detected, multiple lines of evidence supported a dinoflagellate origin for most amplified PKS genes.
Conclusions:
- Dinoflagellates harbor type I polyketide synthase genes, indicating potential for novel polyketide biosynthesis.
- The presence of PKS genes in *Gymnodinium catenatum* expands the known biosynthetic capabilities of this species.
- Further research is warranted to elucidate the functional roles and products of these dinoflagellate PKS genes.