Diethyl pyrocarbonate inactivation of human placental aldehyde reductase II

Aruni Bhatnagar, Ballabh Das, Satish K. Srivastava

Research output: Contribution to journalArticle

2 Scopus citations

Abstract

Diethyl pyrocarbonate inactivated aldehyde reductase II (l-gulonate: NADP+ 6-oxidoreductase, EC 1.1.1.19) from human placenta. A concentration of 0.5-1.0 mM diethyl pyrocarbonate caused 40-65% loss of activity. The inactivation of the enzyme by diethyl pyrocarbonate was reversed by hydroxylamine and was accompanied by a large change in the absorbance of the protein at 242 nm, but not at 278 nm, indicating that only the histidine residues were modified. NADPH, but not glucoronate afforded significant protection to the enzyme from inactivation by diethyl pyrocarbonate. With 0.2-1.0 mM diethyl pyrocarbonate, 4-5 histidine residues were modified with a pseudo-first-order rate process. A double log plot of the fraction of the unmodified residues indicates that only one functional histidine residue is essential for the catalytic activity of aldehyde reductase II.

Original languageEnglish (US)
Pages (from-to)179-184
Number of pages6
JournalBiochimica et Biophysica Acta (BBA)/Protein Structure and Molecular
Volume916
Issue number2
DOIs
StatePublished - Nov 26 1987

Keywords

  • (Human placenta)
  • Active site
  • Aldehyde reductase II
  • Diethyl pyrocarbonate
  • Enzyme inactivation

ASJC Scopus subject areas

  • Biochemistry
  • Biophysics
  • Molecular Biology
  • Structural Biology

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