Context-dependent regulatory mechanism of the splicing factor hnRNP L.
Context-dependent regulatory mechanism of the splicing factor hnRNP L.
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DOI:
10.1016/j.molcel.2009.12.027
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发表时间:
2010-01-29
期刊:
影响因子:
16
通讯作者:
Lynch KW
中科院分区:
文献类型:
--
作者:
Motta-Mena LB;Heyd F;Lynch KW
Splicing regulatory proteins often have distinct activities when bound to exons versus introns. However, less clear is whether variables besides location can influence activity. HnRNP L binds to a motif present in both CD45 variable exons 4 and 5 to affect their coordinate repression. Here we show that, in contrast to its direct repression of exon 4, hnRNP L represses exon 5 by countering the activity of a neighboring splicing enhancer. In the absence of the enhancer hnRNP L unexpectedly activates exon inclusion. As the splice sites flanking exon 4 and 5 are distinct, we directly examined the effect of varying splice site strength on the mechanism of hnRNP L function. Remarkably, binding of hnRNP L to an exon represses strong splice sites but enhances weak splice sites. A model in which hnRNP L stabilizes snRNP binding can explain both effects in a manner determined by the inherent snRNP-substrate affinity.
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