Abstract
At least two distinct ATPases, NSF and p97, are known to be involved in the heterotypic fusion of transport vesicles with their target membranes and the homotypic fusion of membrane compartments. The NSF-mediated fusion pathway is the best characterized, many of the components having been identified and their functions analysed. In contrast, none of the accessory proteins for the p97-mediated fusion pathway has been identified. Now we have identified the first such component, a protein of relative molecular mass 47,000 (p47), which forms a tight, stoichiometric complex with cytosolic p97 (one trimer of p47 per hexamer of p97). It is essential for the p97-mediated regrowth of Golgi cisternae from mitotic Golgi fragments, a process restricted to animal cells. As a homologue of p47 exists in budding yeast, this indicates that it might also be involved in other membrane fusion reactions catalysed by p97, such as karyogamy.
MeSH terms
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Adenosine Triphosphatases / chemistry
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Adenosine Triphosphatases / genetics
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Adenosine Triphosphatases / isolation & purification
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Adenosine Triphosphatases / physiology*
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Amino Acid Sequence
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Animals
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Carrier Proteins / chemistry
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Carrier Proteins / genetics
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Carrier Proteins / isolation & purification
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Carrier Proteins / physiology*
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Cloning, Molecular
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Coenzymes / chemistry
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Coenzymes / physiology
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Fungal Proteins / chemistry
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Golgi Apparatus / physiology
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HeLa Cells
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Humans
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Intracellular Signaling Peptides and Proteins
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Membrane Fusion / physiology*
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Membrane Proteins / chemistry
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Membrane Proteins / genetics
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Membrane Proteins / isolation & purification
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Membrane Proteins / physiology*
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Molecular Sequence Data
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N-Ethylmaleimide-Sensitive Proteins
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Rats
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Recombinant Proteins / chemistry
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Recombinant Proteins / genetics
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Saccharomyces cerevisiae Proteins*
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Sequence Homology, Amino Acid
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Soluble N-Ethylmaleimide-Sensitive Factor Attachment Proteins
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Vesicular Transport Proteins*
Substances
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Carrier Proteins
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Coenzymes
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Fungal Proteins
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Intracellular Signaling Peptides and Proteins
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Membrane Proteins
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Nsfl1c protein, rat
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Recombinant Proteins
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SHP1 protein, S cerevisiae
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Saccharomyces cerevisiae Proteins
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Soluble N-Ethylmaleimide-Sensitive Factor Attachment Proteins
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Vesicular Transport Proteins
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Adenosine Triphosphatases
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N-Ethylmaleimide-Sensitive Proteins
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Nsf protein, rat