Regulation of adenovirus alternative RNA splicing at the level of commitment complex formation.

Abstract:

:The adenovirus late region 1 (L1) represents an example of an alternatively spliced gene where one 5' splice site is spliced to two alternative 3' splice sites, to produce two mRNAs; the 52,55K and IIIa mRNAs, respectively. Accumulation of the L1 mRNAs is temporally regulated during the infectious cycle. Thus, the proximal 3' splice site (52,55K mRNA) is used at all times during the infectious cycle whereas the distal 3' splice site (IIIa mRNA) is used exclusively late in infection. Here we show that in vitro splicing extracts prepared from late adenovirus-infected cells reproduces the virus-induced temporal shift from proximal to distal 3' splice site selection in L1 pre-mRNA splicing. Two stable intermediates in spliceosome assembly have been identified; the commitment complex and the pre-spliceosome (or A complex). We show that the transition in splice site activity in L1 alternative splicing results from an increase in the efficiency of commitment complex formation using the distal 3' splice site in extracts prepared from late virus-infected cells combined with a reduction of the efficiency of proximal 3' splice site splicing. The increase in commitment activity on the distal 3' splice site is paralleled by a virus-induced increase in A complex formation on the distal 3' splice site. Importantly, the virus-induced shift from proximal to distal L1 3' splice site usage does not require cis competition between the 52,55K and the IIIa 3' splice sites, but rather results from the intrinsic property of the two 3' splice sites which make them respond differently to factors in extracts prepared from virus-infected cells.

journal_name

Nucleic Acids Res

journal_title

Nucleic acids research

authors

Kreivi JP,Akusjärvi G

doi

10.1093/nar/22.3.332

subject

Has Abstract

pub_date

1994-02-11 00:00:00

pages

332-7

issue

3

eissn

0305-1048

issn

1362-4962

journal_volume

22

pub_type

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