Evidence of essential arginyl residues in chicken liver mevalonate-5-pyrophosphate decarboxylase

Ana María Jabalquinto, Jaime Eyzaguirre, Emilio Cardemil

Research output: Contribution to journalArticlepeer-review

14 Citations (Scopus)

Abstract

Chicken liver mevalonate-5-pyrophosphate decarboxylase (ATP:5-diphosphomevalonate carboxy-lyase (dehydrating), EC 4.1.1.33.) is inactivated by phenylglyoxal in triethanolamine buffer at pH 8.15. The reaction follows pseudo-first-order kinetics with a second-order rate constant of 108 m-1 min-1. Appropriate treatment of the kinetic data for the inactivation reaction indicates that the reaction of a single phenylglyoxal molecule per active unit of the enzyme is enough to completely inactivate the protein. The partially inactivated enzyme shows unaltered Km but decreased V as compared to native mevalonate-5-pyrophosphate decarboxylase. The dissociation constants for the enzyme-substrate complexes were estimated from inactivation reactions at different concentrations of substrates. From the data it is concluded that the modified amino acid is important for the binding of both substrates.

Original languageEnglish
Pages (from-to)338-343
Number of pages6
JournalArchives of Biochemistry and Biophysics
Volume225
Issue number1
DOIs
Publication statusPublished - Aug 1983

ASJC Scopus subject areas

  • Biophysics
  • Biochemistry
  • Molecular Biology

Fingerprint

Dive into the research topics of 'Evidence of essential arginyl residues in chicken liver mevalonate-5-pyrophosphate decarboxylase'. Together they form a unique fingerprint.

Cite this