Abstract
We have identified between Mex67p and Mtr2p a complex which is essential for mRNA export. This complex, either isolated from yeast or assembled in Escherichia coli, can bind in vitro to RNA through Mex67p. In vivo, Mex67p requires Mtr2p for association with the nuclear pores, which can be abolished by mutating either MEX67 or MTR2. In all cases, detachment of Mex67p from the pores into the cytoplasm correlates with a strong inhibition of mRNA export. At the nuclear pores, Nup85p represents one of the targets with which the Mex67p-Mtr2p complex interacts. Thus, Mex67p and Mtr2p constitute a novel mRNA export complex which can bind to RNA via Mex67p and which interacts with nuclear pores via Mtr2p.
Publication types
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Research Support, Non-U.S. Gov't
MeSH terms
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Escherichia coli / metabolism
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Fungal Proteins / metabolism
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Microscopy, Fluorescence
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Microscopy, Immunoelectron
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Mutation / genetics
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Nuclear Envelope / physiology*
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Nuclear Pore Complex Proteins*
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Nuclear Proteins / metabolism*
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Nucleocytoplasmic Transport Proteins*
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Porins / metabolism
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RNA, Messenger / metabolism*
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RNA-Binding Proteins / metabolism*
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Recombinant Proteins / genetics
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Saccharomyces cerevisiae / metabolism*
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Saccharomyces cerevisiae Proteins*
Substances
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Fungal Proteins
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MEX67 protein, S cerevisiae
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NUP85 protein, S cerevisiae
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Nuclear Pore Complex Proteins
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Nuclear Proteins
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Nucleocytoplasmic Transport Proteins
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Porins
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RNA, Messenger
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RNA-Binding Proteins
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Recombinant Proteins
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Saccharomyces cerevisiae Proteins