Abstract
The cell cycle protein CDC48p from Saccharomyces cerevisiae is a member of a protein superfamily (AAA superfamily) characterized by a common region of approximately 200 amino-acid residues including an ATP binding consensus. CDC48p purified to homogeneity showed considerable ATPase activity which could be completely abolished by preincubation with NEM in the absence of ATP. ATP protects the protein from NEM and stabilizes the otherwise labile enzyme. The ATPase activity is reversibly inhibited by NADH and shows cooperativity with its substrate ATP. The application of the in vitro ATPase activity to the identification of physiologically interacting molecules is discussed. By electron microscopy, the enzyme was shown to consist of hexameric ring structures similar to its vertebrate homologue.
Publication types
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Research Support, Non-U.S. Gov't
MeSH terms
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Adenosine Diphosphate / pharmacology
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Adenosine Triphosphatases / antagonists & inhibitors
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Adenosine Triphosphatases / chemistry
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Adenosine Triphosphatases / metabolism*
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Adenosine Triphosphatases / ultrastructure
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Adenosine Triphosphate / pharmacology
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Allosteric Regulation
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Cell Cycle Proteins / antagonists & inhibitors
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Cell Cycle Proteins / chemistry
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Cell Cycle Proteins / metabolism*
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Cell Cycle Proteins / ultrastructure
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Electrophoresis, Polyacrylamide Gel
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Enzyme Inhibitors / pharmacology
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Ethylmaleimide / pharmacology
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Fungal Proteins / chemistry
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Fungal Proteins / metabolism*
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Fungal Proteins / ultrastructure
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Kinetics
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Microscopy, Electron
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NAD / pharmacology
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Saccharomyces cerevisiae / enzymology*
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Saccharomyces cerevisiae Proteins
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Valosin Containing Protein
Substances
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Cell Cycle Proteins
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Enzyme Inhibitors
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Fungal Proteins
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Saccharomyces cerevisiae Proteins
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NAD
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Adenosine Diphosphate
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Adenosine Triphosphate
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Adenosine Triphosphatases
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CDC48 protein, S cerevisiae
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Valosin Containing Protein
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Ethylmaleimide