GS
The Protéines Gs are one of the principal families of the Protéines G associated with a receiver. It is amongst other things about the receiver to the Glucagon. These receivers consist of 3 sub-units respectively called α, β, γ. But only first is able to fix a molecule of GDP (Guanosine Diphosphate) or GTP (Guanosine Triphosphate)
Operation of the receiver to the Glucagon
The fixing of the hormone involves a modification of the structure D of the receiver which stimulates the separation of the GDP of Gα, which in its turn is detached from both others under units. Being given the prevalence of the GTP on the GDP in the Cytosol, Gα binds to this one, involving the activation of a adénylate cyclase (). This last catalysis the reaction ATP --> AMPc.
PKA (Protein dependant kinase AMPC) consists of two sub-units catalytic S and of two regulating sous_unities. It is on these last that AMPc is fixed, at a rate of 2 molecules per sub-unit, causing the release of the two catalytic sub-units.
They can consequently migrate towards the core where they phosphorylent a factor of transcription CREB (CRE binding protein) related to a sequence CRE (camp in reply element) of DNA (see. When it is phosphoryl, CREB recruits a protein CBP (CREB binding protein) which is a Histone acétyltransférase whose role is to open the Chromatine, thus causing the transcription
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