Abstract
Following transcription and processing, eukaryotic mRNAs are exported from the nucleus to the cytoplasm for translation. Here we present evidence that mRNAs are targeted for nuclear export cotranscriptionally. Combined mutations in the Saccharomyces cerevisiae hnRNP Npl3 and TATA-binding protein (TBP) block mRNA export, implying that cotranscriptional recruitment of Npl3 is required for efficient export of mRNA. Furthermore, Npl3 can be found in a complex with RNA Pol II, indicating that Npl3 associates with the transcription machinery. Finally, Npl3 is recruited to genes in a transcription dependent manner as determined by chromatin immunoprecipitation. Another mRNA export factor, Yra1, also associates with chromatin cotranscriptionally but appears to be recruited at a later step. Taken together, our results suggest that export factors are recruited to the sites of transcription to promote efficient mRNA export.
Publication types
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Research Support, Non-U.S. Gov't
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Research Support, U.S. Gov't, P.H.S.
MeSH terms
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Biological Transport
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Cell Cycle Proteins / metabolism
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Cell Nucleus / metabolism*
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Chromatin / metabolism
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DNA-Binding Proteins / genetics
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DNA-Binding Proteins / metabolism
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Fungal Proteins / genetics
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Fungal Proteins / metabolism
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Models, Genetic
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Mutation
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Nuclear Proteins / genetics
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Nuclear Proteins / metabolism
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RNA Polymerase II / metabolism
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RNA, Fungal / metabolism*
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RNA, Messenger / metabolism*
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RNA-Binding Proteins*
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Saccharomyces cerevisiae
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Saccharomyces cerevisiae Proteins*
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TATA-Box Binding Protein
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Transcription Factors / genetics
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Transcription Factors / metabolism
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Transcription, Genetic*
Substances
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Cell Cycle Proteins
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Chromatin
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DNA-Binding Proteins
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Fungal Proteins
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NPL3 protein, S cerevisiae
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Nuclear Proteins
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RNA, Fungal
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RNA, Messenger
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RNA-Binding Proteins
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SPT15 protein, S cerevisiae
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Saccharomyces cerevisiae Proteins
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TATA-Box Binding Protein
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Transcription Factors
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YRA1 protein, S cerevisiae
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RNA Polymerase II