The Expanding Significance of Inositol Polyphosphate Multikinase as a Signaling Hub

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The inositol polyphosphates are a group of multifunctional signaling metabolites whose synthesis is catalyzed by a family of inositol kinases that are evolutionarily conserved from yeast to humans. Inositol polyphosphate multikinase (IPMK) was first identified as a subunit of the arginine-responsive transcription complex in budding yeast. In addition to its role in the production of inositol tetrakis-and pentakisphosphates (IP4 and IP5), IPMK also exhibits phosphatidylinositol 3-kinase (PI3-kinase) activity. Through its PI3-kinase activity, IPMK activates Akt/PKB and its downstream signaling pathways. IPMK also regulates several protein targets non-catalytically via protein-protein interactions. These non-catalytic targets include cytosolic signaling factors and transcription factors in the nucleus. In this review, we highlight the many known functions of mammalian IPMK in controlling cellular signaling networks and discuss future challenges related to clarifying the unknown roles IPMK plays in physiology and disease.
Publisher
KOREAN SOC MOLECULAR & CELLULAR BIOLOGY
Issue Date
2017-05
Language
English
Article Type
Review
Keywords

ACTIVATED PROTEIN-KINASE; TRANSCRIPTIONAL REGULATION; SACCHAROMYCES-CEREVISIAE; HUNTINGTONS-DISEASE; ARGININE METABOLISM; NEGATIVE REGULATION; AMINO-ACIDS; C-FOS; PENTAKISPHOSPHATE; INDUCTION

Citation

MOLECULES AND CELLS, v.40, no.5, pp.315 - 321

ISSN
1016-8478
DOI
10.14348/molcells.2017.0066
URI
http://hdl.handle.net/10203/224898
Appears in Collection
BS-Journal Papers(저널논문)
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