Evidence for Substrate-Specific Requirement of the Splicing Factor U2AF 35 and for Its Function after Polypyrimidine Tract Recognition by U2AF 65

Author:

Guth Sabine1,Martínez Concepción1,Gaur Rajesh K.2,Valcárcel Juan1

Affiliation:

1. Gene Expression Programme, European Molecular Biology Laboratory, D-69117 Heidelberg, Germany, 1 and

2. Department of Molecular and Cellular Biology, Harvard University, Cambridge, Massachusetts 021382

Abstract

ABSTRACT U2 snRNP auxiliary factor (U2AF) promotes U2 snRNP binding to pre-mRNAs and consists of two subunits of 65 and 35 kDa, U2AF 65 and U2AF 35 . U2AF 65 binds to the polypyrimidine (Py) tract upstream from the 3′ splice site and plays a key role in assisting U2 snRNP recruitment. It has been proposed that U2AF 35 facilitates U2AF 65 binding through a network of protein-protein interactions with other splicing factors, but the requirement and function of U2AF 35 remain controversial. Here we show that recombinant U2AF 65 is sufficient to activate the splicing of two constitutively spliced pre-mRNAs in extracts that were chromatographically depleted of U2AF. In contrast, U2AF 65 , U2AF 35 , and the interaction between them are required for splicing of an immunoglobulin μ pre-RNA containing an intron with a weak Py tract and a purine-rich exonic splicing enhancer. Remarkably, splicing activation by U2AF 35 occurs without changes in U2AF 65 cross-linking to the Py tract. These results reveal substrate-specific requirements for U2AF 35 and a novel function for this factor in pre-mRNA splicing.

Publisher

American Society for Microbiology

Subject

Cell Biology,Molecular Biology

同舟云学术

1.学者识别学者识别

2.学术分析学术分析

3.人才评估人才评估

"同舟云学术"是以全球学者为主线,采集、加工和组织学术论文而形成的新型学术文献查询和分析系统,可以对全球学者进行文献检索和人才价值评估。用户可以通过关注某些学科领域的顶尖人物而持续追踪该领域的学科进展和研究前沿。经过近期的数据扩容,当前同舟云学术共收录了国内外主流学术期刊6万余种,收集的期刊论文及会议论文总量共计约1.5亿篇,并以每天添加12000余篇中外论文的速度递增。我们也可以为用户提供个性化、定制化的学者数据。欢迎来电咨询!咨询电话:010-8811{复制后删除}0370

www.globalauthorid.com

TOP

Copyright © 2019-2024 北京同舟云网络信息技术有限公司
京公网安备11010802033243号  京ICP备18003416号-3