Self-cleavage of hepatitis delta virus genomic strand RNA is enhanced under partially denaturing conditions.

Journal Article (Journal Article)

Self-cleavage of a polyribonucleotide containing an autocleaving sequence from the genomic strand of hepatitis delta virus was enhanced by conditions that destabilized RNA structure. Self-cleavage of the transcripts used in this study required Mg2+ (or another divalent cation), and in the absence of denaturants, maximum cleavage was observed at very low Mg2+ concentrations (0.05-0.1 mM). However, at 37 degrees C and in the presence of 2-10 mM Mg2+ the rate of cleavage was increased as much as 50-fold with the addition of urea to 5 M or formamide to 10 M. Cleavage was prevented by higher concentrations of the same reagents (9.5 M urea or 22.5 M formamide), presumably because a structure required for self-cleavage is disrupted by strongly denaturing conditions. In contrast to a previous report [Wu, H.-N., & Lai, M. M. C. (1989) Science 243, 652-654], we find that chelating Mg2+ with EDTA terminates the cleavage reaction without promoting measurable amounts of ligation of the cleavage products. The ability of denaturants to promote rapid self-cleavage in vitro raises the possibility that an unidentified factor could have a similar effect in vivo.

Full Text

Duke Authors

Cited Authors

  • Rosenstein, SP; Been, MD

Published Date

  • September 4, 1990

Published In

Volume / Issue

  • 29 / 35

Start / End Page

  • 8011 - 8016

PubMed ID

  • 2261458

International Standard Serial Number (ISSN)

  • 0006-2960

Digital Object Identifier (DOI)

  • 10.1021/bi00487a002


  • eng

Conference Location

  • United States