A mutation in the catalytic subunit of cAMP-dependent protein kinase that disrupts regulation. Academic Article uri icon

Overview

abstract

  • A mutant catalytic subunit of adenosine 3',5'-monophosphate (cAMP)-dependent protein kinase has been isolated from Saccharomyces cerevisiae that is no longer subject to regulation yet retains its catalytic activity. Biochemical analysis of the mutant subunit indicates a 100-fold decreased affinity for the regulatory subunit. The mutant catalytic subunit exhibits approximately a threefold increase in Michaelis constant for adenosine triphosphate and peptide cosubstrates, and is essentially unchanged in its catalytic rate. The nucleotide sequence of the mutant gene contains a single nucleotide change resulting in a threonine-to-alanine substitution at amino acid 241. This residue is conserved in other serine-threonine protein kinases. These results identify this threonine as an important contact between catalytic and regulatory subunits but only a minor contact in substrate recognition.

publication date

  • April 1, 1988

Research

keywords

  • Cyclic AMP
  • Protein Kinases
  • Saccharomyces cerevisiae

Identity

Scopus Document Identifier

  • 0023991210

Digital Object Identifier (DOI)

  • 10.1126/science.2832943

PubMed ID

  • 2832943

Additional Document Info

volume

  • 240

issue

  • 4848