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MRAS contains two regions called Switch I (SWI) and Switch II (SWII) that undergo conformational changes depending if MRAS is bound to GDP or GTP <ref name="Liau">PMID: 35768504</ref>. The conformation of these switches determines if the SMP complex can form or not. Mutations to MRAS can lead to consistent GTP-loading, causing an increase in the formation of the SMP complex and there is consistent activation of the cell-proliferation pathway in the absence of external growth factors.
MRAS contains two regions called Switch I (SWI) and Switch II (SWII) that undergo conformational changes depending if MRAS is bound to GDP or GTP <ref name="Liau">PMID: 35768504</ref>. The conformation of these switches determines if the SMP complex can form or not. Mutations to MRAS can lead to consistent GTP-loading, causing an increase in the formation of the SMP complex as well as consistent activation of the cell-proliferation pathway in the absence of external growth factors.