Abstract
Inositol pyrophosphates are a diverse group of high-energy signaling molecules whose cellular roles remain an active area of study. We report a previously uncharacterized class of inositol pyrophosphate synthase and find it is identical to yeast Vip1 and Asp1 proteins, regulators of actin-related protein-2/3 (ARP 2/3) complexes. Vip1 and Asp1 acted as enzymes that encode inositol hexakisphosphate (IP6) and inositol heptakisphosphate (IP7) kinase activities. Alterations in kinase activity led to defects in cell growth, morphology, and interactions with ARP complex members. The functionality of Asp1 and Vip1 may provide cells with increased signaling capacity through metabolism of IP6.
Publication types
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Research Support, N.I.H., Extramural
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Research Support, Non-U.S. Gov't
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Research Support, U.S. Gov't, Non-P.H.S.
MeSH terms
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Actin-Related Protein 3 / metabolism
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Amino Acid Sequence
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Animals
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Catalytic Domain
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Chromatography, High Pressure Liquid
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Conserved Sequence
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Cytoskeletal Proteins / chemistry
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Cytoskeletal Proteins / genetics
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Cytoskeletal Proteins / isolation & purification
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Cytoskeletal Proteins / metabolism*
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Humans
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Inositol Phosphates / metabolism
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Molecular Sequence Data
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Multifunctional Enzymes
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Phosphorylation
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Phosphotransferases (Phosphate Group Acceptor) / chemistry
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Phosphotransferases (Phosphate Group Acceptor) / genetics
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Phosphotransferases (Phosphate Group Acceptor) / isolation & purification
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Phosphotransferases (Phosphate Group Acceptor) / metabolism*
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Phytic Acid / metabolism*
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Protein Structure, Tertiary
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Pyrophosphatases
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Recombinant Fusion Proteins / chemistry
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Recombinant Fusion Proteins / isolation & purification
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Recombinant Fusion Proteins / metabolism
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Saccharomyces cerevisiae / enzymology*
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Saccharomyces cerevisiae / genetics
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Saccharomyces cerevisiae Proteins / chemistry
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Saccharomyces cerevisiae Proteins / genetics
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Saccharomyces cerevisiae Proteins / isolation & purification
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Saccharomyces cerevisiae Proteins / metabolism
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Schizosaccharomyces / cytology
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Schizosaccharomyces / enzymology*
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Schizosaccharomyces / genetics
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Schizosaccharomyces / growth & development
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Schizosaccharomyces pombe Proteins / chemistry
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Schizosaccharomyces pombe Proteins / genetics
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Schizosaccharomyces pombe Proteins / isolation & purification
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Schizosaccharomyces pombe Proteins / metabolism*
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Sequence Alignment*
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Substrate Specificity
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Temperature
Substances
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Actin-Related Protein 3
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Asp1 protein, S pombe
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Cytoskeletal Proteins
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Inositol Phosphates
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Multifunctional Enzymes
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Recombinant Fusion Proteins
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Saccharomyces cerevisiae Proteins
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Schizosaccharomyces pombe Proteins
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inositol heptakisphosphate
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Phytic Acid
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Phosphotransferases (Phosphate Group Acceptor)
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KCS1 protein, S cerevisiae
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inositol hexakisphosphate kinase
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Pyrophosphatases