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A plasma membrane protein begins with a large hydrophilic regulatory domain. This is followed by six hydrophobic regions of 20+ amino acids, with short hydrophilic regions in between. Finally, a large hydrophilic domain, called domain A, is at the end of the polypeptide. The first signaling sequence of this protein is an N-terminal signal sequence.
If all six hydrophobic domains cross the membrane one time each, then it is possible that
the regulatory domain and domain A will be on the same side of the membrane
the regulatory domain and domain A will both be intracelluar
the regulatory domain and domain A are transmembrane domains
the regulatory domain is intracellular and domain A is extracellular
Choices A and B are both possible

Sagot :

Option D is the correct answer, The mutation stops G-alpha plasma membrane from hydrophilic regulatory domain attaching to GTP. Domain A is extracellular, while the regulatory domain is intracellular. which inhibits glycogenolysis is by a mutation.

Despite the absence of a ligand, the G protein would still be functioning and signaling. The release plasma membrane of the bound trimeric hydrophilic regulatory domain G protein (inactive) from the receptor plasma membrane and the dissociation of the active a subunit (GTP-bound) and bg dimer are made possible by the binding of GTP, which modifies the conformation of switch areas within the a subunit. When an extracellular plasma membrane signal binds hydrophilic regulatory domain to a G-protein-coupled receptor, GDP is changed into GTP and the G-protein is able to attach to the receptor.

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