On how hydrolysis at the 3' end is prevented in the splicing of a sequentially folded group I intron.

Abstract:

:We propose a dynamic model for the competition between exon-exon ligation and 3'-end hydrolysis valid for sequentially folded pre-mRNA introns of group I. This model accounts for the delay in the formation of conserved helix P10 until the 5' exon has been cleaved, a requirement to prevent hydrolysis at the 3' end of the intron. The model is rooted on computer simulations whereby the pre-mRNA searches for its structure as it is being transcribed. Thus, a competing interaction, engaging the internal guiding sequence, occurs initially and prevents P10 from forming until the 3' end of the 5' exon is habilitated as a nucleophilic agent. It is further shown that a destabilization of the competing interaction invariably leads to 3' hydrolysis, crippling the splicing capability of the intron. The results may be probed by site-directed mutagenesis.

journal_name

FEBS Lett

journal_title

FEBS letters

authors

Fernández A

doi

10.1016/0014-5793(92)80360-s

keywords:

subject

Has Abstract

pub_date

1992-02-03 00:00:00

pages

201-4

issue

1-2

eissn

0014-5793

issn

1873-3468

pii

0014-5793(92)80360-S

journal_volume

297

pub_type

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