An endonuclease switching mechanism in the virion RNA and cRNA promoters of Thogoto orthomyxovirus.

Abstract:

:An in vitro assay was developed to investigate endonuclease activity of Thogoto virus, a tick-borne orthomyxovirus. Endonuclease activity relied on an interaction between the 3' and 5' termini of virion RNA (vRNA) and not those of cRNA. Evidence was obtained that cap structures are cleaved directly from cap donors and that cleavage does not occur after pyrimidines. A 5' hook structure, present in the vRNA promoter but not the cRNA promoter, was introduced into cRNA promoter mutants. These mutants stimulated endonuclease activity, although at levels slightly lower than that of vRNA. The ability of the cRNA promoter to stimulate endonuclease activity when mutated to contain a 5' hook structure indicates that this structure constitutes a switching mechanism for endonuclease activity between the vRNA and cRNA promoters.

journal_name

J Virol

journal_title

Journal of virology

authors

Leahy MB,Dessens JT,Pritlove DC,Nuttall PA

doi

10.1128/JVI.72.3.2305-2309.1998

subject

Has Abstract

pub_date

1998-03-01 00:00:00

pages

2305-9

issue

3

eissn

0022-538X

issn

1098-5514

journal_volume

72

pub_type

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