PIKFYVE
PIKfyve, a FYVE finger-containing phosphoinositide kinase, is an enzyme that in humans is encoded by the PIKFYVE gene.[5][6]
Function
The principal enzymatic activity of PIKfyve is to phosphorylate PtdIns3P to PtdIns(3,5)P2. PIKfyve activity is responsible for the production of both PtdIns(3,5)P2 and phosphatidylinositol 5-phosphate (PtdIns5P).[7][8][9][10] PIKfyve is a large protein, containing a number of functional domains and expressed in several spliced forms. The reported full-length mouse and human cDNA clones encode proteins of 2052 and 2098 amino acid residues, respectively.[6][11][12][13] By directly binding membrane PtdIns(3)P,[14] the FYVE finger domain of PIKfyve is essential in localizing the protein to the cytosolic leaflet of endosomes.[6][14] Impaired PIKfyve enzymatic activity by dominant-interfering mutants, siRNA- mediated ablation or pharmacological inhibition causes endosome enlargement and cytoplasmic vacuolation due to impaired PtdIns(3,5)P2 synthesis. Thus, via PtdIns(3,5)P2 production, PIKfyve participates in several aspects of endosome dynamics,[15][16] thereby affecting a number of trafficking pathways that emanate from or traverse the endosomal system en route to the trans-Golgi network or later compartments along the endocytic pathway.[17][18][19][20][21][22]
Medical significance
PIKfyve mutations affecting one of the two PIKFYVE alleles are found in 8 out of 10 families with Francois-Neetens corneal fleck dystrophy.[23] Disruption of both PIKFYVE alleles in the mouse is lethal at the stage of pre-implantation embryo.[24] PIKfyve’s role in pathogen invasion is deduced by evidence from cell studies implicating PIKfyve activity in HIV and Salmonella replication.[20][25][26] A link of PIKfyve with type 2 diabetes is inferred by the observations that PIKfyve perturbation inhibits insulin-regulated glucose uptake.[27][28] Concordantly, mice with selective Pikfyve gene disruption in skeletal muscle, the tissue mainly responsible for the decrease of postprandial blood sugar, exhibit systemic insulin resistance; glucose intolerance; hyperinsulinemia; and increased adiposity, i.e. symptoms, typical for human prediabetes.[29]
Interactions
PIKfyve physically associates with its regulator ArPIKfyve, a protein encoded by the human gene VAC14, and the Sac1 domain-containing PtdIns(3,5)P2 5-phosphatase Sac3, encoded by FIG4, to form a stable ternary heterooligomeric complex that is scaffolded by ArPIKfyve homooligomeric interactions. The presence of two enzymes with opposing activities for PtdIns(3,5)P2 synthesis and turnover in a single complex indicates the requirement for a tight control of PtdIns(3,5)P2 levels.[16][30][31] PIKfyve also interacts with the Rab9 effector RABEPK and the kinesin adaptor JLP, encoded by SPAG9.[18][22] These interactions link PIKfyve to microtubule-based endosome to trans-Golgi network traffic. Under sustained activation of glutamate receptors PIKfyve binds to and facilitates the lysosomal degradation of Cav1.2, voltage-dependent calcium channel type 1.2, thereby protecting the neurons from excitotoxicity.[32] PIKfyve negatively regulates Ca2+-dependent exocytosis in neuroendocrine cells without affecting voltage-gated calcium channels.[33]
Evolutionary biology
PIKFYVE belongs to a large family of evolutionarily-conserved lipid kinases. Single copy genes, encoding similarly-structured FYVE-domain–containing phosphoinositide kinases exist in most genomes from yeast to man. The plant A. thaliana has several copies of the enzyme. Higher eukaryotes (after D. melanogaster), acquire an additional DEP domain. The S. cerevisiae enzyme Fab1p is required for PtdIns(3,5)P2 synthesis under basal conditions and in response to hyperosmotic shock. PtdIns5P, made by PIKfyve kinase activity in mammalian cells, is not detected in budding yeast.[34] Yeast Fab1p associates with Vac14p (the ortholog of human ArPIKfyve) and Fig4p (the ortholog of Sac3).[35] The yeast Fab1 complex also includes Vac7p and probably Atg18p, proteins that are not detected in the mammalian PIKfyve complex.[36] S. cerevisiae could survive without Fab1.[37] In contrast, the knockout of the FYVE domain-containing enzymes in A. thaliana, D. melanogaster, C. elegans and M. musculus leads to embryonic lethality indicating that the FYVE-domain–containing phosphoinositide kinases have become essential in embryonic development of multicellular organisms.[24][38][39][40] Thus, in evolution, the FYVE-domain-containing phosphoinositide kinases retain several aspects of the structural organization, enzyme activity and protein interactions from budding yeast. In higher eukaryotes, the enzymes acquire one additional domain, a role in the production of PtdIns5P, a new set of interacting proteins and become essential in embryonic development.
References
- ^ a b c GRCh38: Ensembl release 89: ENSG00000115020 – Ensembl, May 2017
- ^ a b c GRCm38: Ensembl release 89: ENSMUSG00000025949 – Ensembl, May 2017
- ^ "Human PubMed Reference:". National Center for Biotechnology Information, U.S. National Library of Medicine.
- ^ "Mouse PubMed Reference:". National Center for Biotechnology Information, U.S. National Library of Medicine.
- ^ "Entrez Gene: Phosphoinositide kinase, FYVE finger containing".
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Further reading
- Nagase T, Ishikawa K, Suyama M, et al. (1999). "Prediction of the coding sequences of unidentified human genes. XIII. The complete sequences of 100 new cDNA clones from brain which code for large proteins in vitro". DNA Res. 6 (1): 63–70. doi:10.1093/dnares/6.1.63. PMID 10231032.
- Strausberg RL, Feingold EA, Grouse LH, et al. (2003). "Generation and initial analysis of more than 15,000 full-length human and mouse cDNA sequences". Proc. Natl. Acad. Sci. U.S.A. 99 (26): 16899–903. doi:10.1073/pnas.242603899. PMC 139241. PMID 12477932.
- Jiao X, Munier FL, Schorderet DF, et al. (2003). "Genetic linkage of Francois-Neetens fleck (mouchetée) corneal dystrophy to chromosome 2q35". Hum. Genet. 112 (5–6): 593–9. doi:10.1007/s00439-002-0905-1. PMID 12607114.
- Ikonomov OC, Sbrissa D, Foti M, et al. (2004). "PIKfyve controls fluid phase endocytosis but not recycling/degradation of endocytosed receptors or sorting of procathepsin D by regulating multivesicular body morphogenesis". Mol. Biol. Cell. 14 (11): 4581–91. doi:10.1091/mbc.E03-04-0222. PMC 266774. PMID 14551253.
- Ota T, Suzuki Y, Nishikawa T, et al. (2004). "Complete sequencing and characterization of 21,243 full-length human cDNAs". Nat. Genet. 36 (1): 40–5. doi:10.1038/ng1285. PMID 14702039.
- Brill LM, Salomon AR, Ficarro SB, et al. (2004). "Robust phosphoproteomic profiling of tyrosine phosphorylation sites from human T cells using immobilized metal affinity chromatography and tandem mass spectrometry". Anal. Chem. 76 (10): 2763–72. doi:10.1021/ac035352d. PMID 15144186.
- Sbrissa D, Ikonomov OC, Shisheva A (2002). "Phosphatidylinositol 3-phosphate-interacting domains in PIKfyve. Binding specificity and role in PIKfyve. Endomembrane localization". J Biol Chem. 277 (8): 6073–9. doi:10.1074/jbc.M110194200. PMID 11706043.
{{cite journal}}
: CS1 maint: unflagged free DOI (link) - Sbrissa D, Ikonomov OC, Strakova J, et al. (2005). "A mammalian ortholog of Saccharomyces cerevisiae Vac14 that associates with and up-regulates PIKfyve phosphoinositide 5-kinase activity". Mol. Cell. Biol. 24 (23): 10437–47. doi:10.1128/MCB.24.23.10437-10447.2004. PMC 529046. PMID 15542851.
- Rush J, Moritz A, Lee KA, et al. (2005). "Immunoaffinity profiling of tyrosine phosphorylation in cancer cells". Nat. Biotechnol. 23 (1): 94–101. doi:10.1038/nbt1046. PMID 15592455.
- Olsen JV, Blagoev B, Gnad F, et al. (2006). "Global, in vivo, and site-specific phosphorylation dynamics in signaling networks". Cell. 127 (3): 635–48. doi:10.1016/j.cell.2006.09.026. PMID 17081983.