Two molecular weight forms of human 2',5'-oligoadenylate synthetase have different activation requirements. Academic Article uri icon

Overview

abstract

  • Ion-exchange and gel filtration chromatography were used to purify partially a 33,000-dalton (33 kD) 2',5'-oligoadenylate synthetase and a 110,000-dalton (110 kD) 2',5'-oligoadenylate synthetase from HeLa cells treated with alpha-interferon (IFN-alpha). The 33-kD enzyme was optimally activated only when double-stranded RNA was added in 100 to 1000-fold excess of the concentration activating the 110-kD enzyme. Certain double- or triple-stranded RNAs, which were observed to activate the 110-kD enzyme, failed to activate the 33-kD enzyme, even when added at high concentration. The 110-kD enzyme manifested an alkaline pH optimum of 7.5 or more and the 33-kD enzyme an acidic pH optimum of 6.0 or less. The results suggest that intracellular activation of the two forms of 2',5'-oligoadenylate synthetase may occur under markedly different conditions.

publication date

  • February 1, 1986

Research

keywords

  • 2',5'-Oligoadenylate Synthetase
  • Enzyme Activation
  • Interferon Type I
  • Isoenzymes

Identity

Scopus Document Identifier

  • 0022443370

PubMed ID

  • 3701128

Additional Document Info

volume

  • 6

issue

  • 1