PMID: 8471609Apr 20, 1993Paper

Phenylhydrazones as new good substrates for the dioxygenase and peroxidase reactions of prostaglandin synthase: formation of iron(III)-sigma-phenyl complexes

Biochemistry
J P MahyD Mansuy

Abstract

Phenylhydrazones of various aromatic and aliphatic aldehydes or ketones act as good substrates of the dioxygenase reaction of prostaglandin synthase (PGHS). Corresponding alpha-azo hydroperoxides are formed as intermediates with maximum initial rates of O2 consumption between 8 and 230 mol (mol of PGHS)-1 s-1 for benzophenone and hexanal phenylhydrazone, respectively. The Km values for these reactions vary from 100 to 300 microM. These alpha-azo hydroperoxides are then converted to the corresponding alpha-azo alcohols by the peroxidase reaction of PGHS. During such oxidations of phenylhydrazones by PGHS, a new complex of this hemeprotein characterized by peaks at 438 and 556 nm is formed. This complex was obtained both by direct reaction of PGHS Fe(III) with phenyldiazene and by reaction of PGHS Fe(III) with phenylhydrazine in the presence of O2. By analogy to results previously reported for hemoglobin, myoglobin, catalase, and cytochrome P450, this species should be a sigma-phenyl PGHS FeIII-Ph complex. The PGHS FeIII-Ph complex should derive from an oxidation of the intermediate alpha-azo alcohol by PGHS Fe(III), cleavage of the resulting alkoxy radical with formation of a ketone (or aldehyde) and Ph*, and combination of PGHS...Continue Reading

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Citations

Jan 1, 1995·Biochimie·P R Ortiz de Montellano
Apr 12, 2000·European Journal of Medicinal Chemistry·P C LimaE J Barreiro
Jun 7, 2006·Biological & Pharmaceutical Bulletin·Ali AlmasiradAbbas Shafiee
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May 26, 2004·Bioorganic & Medicinal Chemistry·Gildásio A SilvaCarlos A M Fraga
Feb 24, 2012·Bioorganic & Medicinal Chemistry·Paola HernándezHugo Cerecetto
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Mar 23, 2019·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Piotr ŚwiątekRafal Urniaz

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