INP54 protein (Saccharomyces cerevisiae) - STRING interaction network
"INP54" - Phosphatidylinositol 4,5-bisphosphate 5-phosphatase in Saccharomyces cerevisiae
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Known Interactions
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Predicted Interactions
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Gene Fusion
INP54Phosphatidylinositol 4,5-bisphosphate 5-phosphatase; role in secretion; localizes to the endoplasmic reticulum via the C-terminal tail; lacks the Sac1 domain and proline-rich region found in the other 3 INP proteins; Regulates the phosphatidylinositol (4,5)-diphosphate levels on the cytoplasmic surface of the endoplasmic reticulum and thereby regulates secretion. Does not utilize phosphatidylinositol 3,5-bisphosphate (PtdIns(3,5)P2), nor phosphatidylinositol 3- phosphate (PtdIns(3)P) and phosphatidylinositol 4-phosphate (PtdIns(4)P) (384 aa)    
Predicted Functional Partners:
Phosphatidylinositol-4-phosphate 5-kinase, involved in actin cytoskeleton organization and cell morphogenesis; multicopy suppressor of stt4 mutation; Catalyzes the phosphorylation of phosphatidylinositol 4- phosphate on the fifth hydroxyl of the myo-inositol ring, to form phosphatidylinositol 4,5-bisphosphate. Acts downstream of STT4, but in a pathway that does not involve PKC1. May be involved in the organization of the actin cytoskeleton (779 aa)
Phosphatidylinositol phosphate (PtdInsP) phosphatase involved in hydrolysis of PtdIns[4]P; transmembrane protein localizes to ER and Golgi; involved in protein trafficking and processing, secretion, and cell wall maintenance; Phosphoinositide phosphatase that hydrolyzes PtdIns(3)P and PtdIns(4)P. Has low activity towards PtdIns(3,5)P2. May be involved in the coordination of the activities of the secretory pathway and the actin cytoskeleton (623 aa)
Rab family GTPase essential for vesicle-mediated exocytic secretion and autophagy; associates with the exocyst component Sec15p and may regulate polarized delivery of transport vesicles to the exocyst at the plasma membrane; Involved in exocytosis. Maybe by regulating the binding and fusion of secretory vesicles with the cell surface. The GTP- bound form of SEC4 may interact with an effector, thereby stimulating its activity and leading to exocytotic fusion. SEC4 may be an upstream activator of the 19.5S SEC8/SEC15 particle. SEC4 probably interacts directly with SEC8; it could serve as [...] (215 aa)
Splicing factor associated with the spliceosome; contains a U-box, a motif found in a class of ubiquitin ligases, and a WD40 domain; Probable ubiquitin-protein ligase involved in pre-mRNA splicing. Acts as a central component of the NTC complex (or PRP19-associated complex) that associates to the spliceosome to mediate conformational rearrangement or to stabilize the structure of the spliceosome after U4 snRNA dissociation, which leads to spliceosome maturation. It is also probably involved in DNA repair (503 aa)
Phospholipase C, hydrolyzes phosphatidylinositol 4,5-biphosphate (PIP2) to generate the signaling molecules inositol 1,4,5-triphosphate (IP3) and 1,2-diacylglycerol (DAG); involved in regulating many cellular processes; The production of the second messenger molecules diacylglycerol (DAG) and inositol 1,4,5-trisphosphate (IP3) is mediated by activated phosphatidylinositol-specific phospholipase C enzymes. Required for cell growth, osmoresistance and expression of GPD1 (869 aa)
Inositol polyphosphate multikinase (IPMK), sequentially phosphorylates Ins(1,4,5)P3 to form Ins(1,3,4,5,6)P5; also has diphosphoinositol polyphosphate synthase activity; regulates arginine-, phosphate-, and nitrogen-responsive genes; Has kinase activity and phosphorylates inositol 1,4,5- trisphosphate (Ins(1,4,5)P3) and inositol 1,3,4,5- tetrakisphosphate (Ins(1,3,4,5)P4). Has low kinase activity towards InsP6. With ARG80, ARG81 and MCM1, coordinates the expression of arginine anabolic and catabolic genes in response to arginine. Recruites ARG80 and MCM21 to stabilize them (355 aa)
Phosphatidylinositol-4-kinase; functions in the Pkc1p protein kinase pathway; required for normal vacuole morphology, cell wall integrity, and actin cytoskeleton organization; Acts on phosphatidylinositol (PI) in the first committed step in the production of the second messenger inositol 1,4,5,- trisphosphate. STT4 functions in PKC1 protein kinase pathway (1900 aa)
Phosphatidylinositol 4-kinase; catalyzes first step in the biosynthesis of phosphatidylinositol-4,5-biphosphate; may control cytokinesis through the actin cytoskeleton; Acts on phosphatidylinositol (PI) in the first committed step in the production of the second messenger inositol 1,4,5,- trisphosphate. PIK1 is part of a nuclear phosphoinositide cycle and could control cytokinesis through the actin cytoskeleton (1066 aa)
Phosphatidylinositol 3,5-bisphosphate (PtdIns[3,5]P) phosphatase; required for efficient mating and response to osmotic shock; physically associates with and regulated by Vac14p; contains a SAC1-like domain; The PI(3,5)P2 regulatory complex regulates both the synthesis and turnover of phosphatidylinositol 3,5-bisphosphate (PtdIns(3,5)P2). Major enzyme required for hyperosmotic shock- induced turnover of PtdIns(3,5)P2 and requires VAC14 for this function. In vivo, mediates turnover of PtdIns(3,5)P2 at the vacuole membrane necessary for vacuolar size control. In vitro, catalyzes the remo [...] (879 aa)
Phosphatidylinositol 3-phosphate (PI3P) phosphatase; involved in various protein sorting pathways, including CVT targeting and endosome to vacuole transport; has similarity to the conserved myotubularin dual specificity phosphatase family; Lipid phosphatase which dephosphorylates phosphatidylinositol 3-monophosphate (PI3P). Involved in the control of PI3P-dependent signaling and in the maintenance of endosomal system integrity (688 aa)
Your Current Organism:
Saccharomyces cerevisiae
NCBI taxonomy Id: 4932
Other names: Candida robusta, Pachytichospora, S. cerevisiae, Saccharomyces, Saccharomyces capensis, Saccharomyces cerevisiae, Saccharomyces italicus, Saccharomyces oviformis, Saccharomyces uvarum var. melibiosus, lager beer yeast, yeast
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