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Related Experiment Videos

Primary structure of human thromboxane synthase determined from the cDNA sequence.

K Ohashi1, K H Ruan, R J Kulmacz

  • 1Department of Internal Medicine, University of Texas Health Science Center, Houston 77030.

The Journal of Biological Chemistry
|January 15, 1992
PubMed
Summary

Researchers identified two complementary DNA (cDNA) clones for thromboxane A2 synthase in human lung tissue. These findings reveal potential new forms of cytochrome P450 enzymes involved in prostaglandin metabolism.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Enzymology

Background:

  • Thromboxane A2 synthase (EC 5.3.99.5) is crucial for prostaglandin synthesis.
  • Understanding its genetic basis is key to metabolic pathway research.

Purpose of the Study:

  • To isolate and characterize the complementary DNA (cDNA) encoding human thromboxane A2 synthase.
  • To investigate potential isoforms of the enzyme.

Main Methods:

  • Polymerase chain reaction (PCR) was used to isolate cDNA from a human lung library.
  • Hybridization studies identified mRNA species in leukemia cell lines.
  • Sequence analysis predicted protein structures and functions.

Main Results:

  • Two distinct cDNA clones for thromboxane A2 synthase were identified.

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  • The predicted proteins (thromboxane synthase-I and -II) differ in length and contain functional motifs like N-glycosylation sites and a hydrophobic anchor region.
  • Sequence similarities suggest thromboxane synthase may represent a novel cytochrome P450 family.

    • Conclusions:

    • Human thromboxane A2 synthase exists in at least two forms, encoded by different cDNAs.
    • These findings expand our understanding of the cytochrome P450 superfamily and prostaglandin metabolism.