Effects of conserved RNA secondary structures on hepatitis delta virus genotype I RNA editing, replication, and virus production.

Abstract:

:RNA editing of the hepatitis delta virus (HDV) antigenome at the amber/W site by the host RNA adenosine deaminase ADAR1 is a critical step in the HDV replication cycle. Editing is required for production of the viral protein hepatitis delta antigen long form (HDAg-L), which is necessary for viral particle production but can inhibit HDV RNA replication. The RNA secondary structural features in ADAR1 substrates are not completely defined, but base pairing in the 20-nucleotide (nt) region 3' of editing sites is thought to be important. The 25-nt region 3' of the HDV amber/W site in HDV genotype I RNA consists of a conserved secondary structure that is mostly base paired but also has asymmetric internal loops and single-base bulges. To understand the effect of this 3' region on the HDV replication cycle, mutations that either increase or decrease base pairing in this region were created and the effects of these changes on amber/W site editing, RNA replication, and virus production were studied. Increased base pairing, particularly in the region 15 to 25 nt 3' of the editing site, significantly increased editing; disruption of base pairing in this region had little effect. Increased editing resulted in a dramatic inhibition of HDV RNA synthesis, mostly due to excess HDAg-L production. Although virus production at early times was unaffected by this reduced RNA replication, at later times it was significantly reduced. Therefore, it appears that the conserved RNA secondary structure around the HDV genotype I amber/W site has been selected not for the highest editing efficiency but for optimal viral replication and secretion.

journal_name

J Virol

journal_title

Journal of virology

authors

Jayan GC,Casey JL

doi

10.1128/JVI.79.17.11187-11193.2005

subject

Has Abstract

pub_date

2005-09-01 00:00:00

pages

11187-93

issue

17

eissn

0022-538X

issn

1098-5514

pii

79/17/11187

journal_volume

79

pub_type

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