Site-directed mutagenesis of the conserved tyrosine 151 of human placental NAD(+)-dependent 15-hydroxyprostaglandin dehydrogenase yields a catalytically inactive enzyme.
Article Details
- CitationCopy to clipboard
Ensor CM, Tai HH
Site-directed mutagenesis of the conserved tyrosine 151 of human placental NAD(+)-dependent 15-hydroxyprostaglandin dehydrogenase yields a catalytically inactive enzyme.
Biochem Biophys Res Commun. 1991 Apr 30;176(2):840-5.
- PubMed ID
- 2025296 [ View in PubMed]
- Abstract
NAD(+)-dependent 15-hydroxyprostaglandin dehydrogenase (15-PGDH) is a key enzyme involved in the biological inactivation of the prostaglandins. The cDNA for human placental 15-PGDH has been expressed in Escherichia coli. Site-directed mutagenesis was used to convert a highly conserved tyrosine at position 151 in 15-PGDH to an alanine. The DNA coding for this alanine mutant 15-PGDH was expressed in E. coli. Western blot analysis indicated that this mutant protein was expressed in amounts comparable to the wild type enzyme in bacteria, however no 15-PGDH activity could be detected. This result indicates that tyrosine 151 in 15-PGDH is essential for activity.