Abstract
A cytosolic yeast karyopherin, Kap104p, was isolated and shown to function in the nuclear import of a specific class of proteins. The protein bound directly to repeat-containing nucleoporins and to a cytosolic pool of two nuclear messenger RNA (mRNA) binding proteins, Nab2p and Nab4p. Depletion of Kap104p resulted in a rapid shift of Nab2p from the nucleus to the cytoplasm without affecting the localization of other nuclear proteins tested. This finding suggests that the major function of Kap104p lies in returning mRNA binding proteins to the nucleus after mRNA export.
Publication types
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Research Support, Non-U.S. Gov't
MeSH terms
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Amino Acid Sequence
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Biological Transport
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Carrier Proteins / chemistry
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Carrier Proteins / isolation & purification
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Carrier Proteins / metabolism*
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Cell Nucleus / metabolism*
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Cytosol / chemistry
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Cytosol / metabolism
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Fungal Proteins / metabolism*
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Karyopherins*
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Membrane Proteins / metabolism
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Molecular Sequence Data
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Mutation
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Nuclear Envelope / metabolism
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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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RNA, Messenger / genetics
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RNA, Messenger / metabolism
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RNA-Binding Proteins / metabolism*
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Recombinant Fusion Proteins / metabolism
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Saccharomyces cerevisiae / metabolism*
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Saccharomyces cerevisiae Proteins*
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Temperature
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beta Karyopherins
Substances
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Carrier Proteins
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Fungal Proteins
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KAP104 protein, S cerevisiae
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Karyopherins
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Membrane Proteins
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NAB2 protein, S cerevisiae
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NUP100 protein, S cerevisiae
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NUP116 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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RNA, Messenger
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RNA-Binding Proteins
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Recombinant Fusion Proteins
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Saccharomyces cerevisiae Proteins
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beta Karyopherins