NDLI: Metabolic switching of PI3K-dependent lipid signals.

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Metabolic switching of PI3K-dependent lipid signals.

Content Provider	Semantic Scholar
Author	Downes, C. Peter Leslie, Nicholas R. Batty, Ian H. Kaay, Jeroen Van Der
Copyright Year	2007
Abstract	The lipid phosphatase, PTEN (phosphatase and tensin homologue deleted on chromosome 10), is the product of a major tumour suppressor gene that antagonizes PI3K (phosphoinositide 3-kinase) signalling by dephosphorylating the 3-position of the inositol ring of PtdIns(3,4,5)P(3). PtdIns(3,4,5)P(3) is also metabolized by removal of the 5-phosphate catalysed by a distinct family of enzymes exemplified by SHIP1 [SH2 (Src homology 2)-containing inositol phosphatase 1] and SHIP2. Mouse knockout studies, however, suggest that PTEN and SHIP2 have profoundly different biological functions. One important reason for this is likely to be that SHIP2 exists in a relatively inactive state until cells are exposed to growth factors or other stimuli. Hence, regulation of SHIP2 is geared towards stimulus dependent antagonism of PI3K signalling. PTEN, on the other hand, appears to be active in unstimulated cells and functions to maintain basal PtdIns(3,4,5)P(3) levels below the critical signalling threshold. We suggest that concomitant inhibition of cysteine-dependent phosphatases, such as PTEN, with activation of SHIP2 functions as a metabolic switch to regulate independently the relative levels of PtdIns(3,4,5)P(3) and PtdIns(3,4)P(2).
Starting Page	1
Ending Page	2
Page Count	2
File Format	PDF HTM / HTML
Alternate Webpage(s)	http://www.biochemsoctrans.org/content/ppbiost/35/2/188.full.pdf
PubMed reference number	17371235v1
Volume Number	35
Part	2
Journal	Biochemical Society transactions
Language	English
Access Restriction	Open
Subject Keyword	1-Phosphatidylinositol 3-Kinase Anatomical compartments Chromosomes, Human, Pair 10 Endosomes Growth Factor Homologous Gene INPPL1 gene Inositol Metabolic Process, Cellular PTEN protein, human Phosphatidylinositols Phosphoric Monoester Hydrolases Physical Inactivity Plasma membrane Protein Tyrosine Phosphatase biological signaling phosphatidylinositol 3,4,5-triphosphate phosphatidylinositol 3,4-diphosphate tensin
Content Type	Text
Resource Type	Article

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