GRB2:SOS1:p-Y-IRS1,p-Y-IRS2 mediated nucleotide exchange of RAS

Stable Identifier
R-HSA-109817
Type
Reaction [transition]
Species
Homo sapiens
Compartment
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SOS promotes the formation of GTP-bound RAS, thus activating this protein. RAS activation results in activation of the protein kinases RAF1, B-Raf, and MAP-ERK kinase kinase (MEKK), and the catalytic subunit of PI3K, as well as of a series of RALGEFs. The activation cycle of RAS GTPases is regulated by their interaction with specific guanine nucleotide exchange factors (GEFs) and GTPase-activating proteins (GAPs). GEFs promote activation by inducing the release of GDP, whereas GAPs inactivate RAS-like proteins by stimulating their intrinsic GTPase activity. NGF-induced RAS activation via SHC-GRB2-SOS is maximal at 2 min but it is no longer detected after 5 min. Therefore, the transient activation of RAS obtained through SHC-GRB2-SOS is insufficient for the prolonged activation of ERKs found in NGF-treated cells.

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Catalyst Activity
Title
Ras guanyl-nucleotide exchange factor activity of GRB2-1:SOS1:p-Y-IRS1,p-Y-IRS2 [cytosol]
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Activity
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Created