Beta2 adrenergic receptor-Gs protein complex: Difference between revisions
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== G Protein Cycle == | == G Protein Cycle == | ||
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Image:G protein cycle for the b2AR–Gs complex.JPG|300px|G protein cycle for the b2AR–Gs complex. | Image:G protein cycle for the b2AR–Gs complex.JPG|300px|G protein cycle for the b2AR–Gs complex. | ||
poly 131 45 213 | poly 131 45 213 41 210 110 127 109 [[2zv4]] | ||
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The figure shows the G Protein cycle <ref>doi:10.1038/nature10361</ref> - an extracellular agonist binds to the β2AR leads [[Group:SMART:A Physical Model of the β2-Adrenergic Receptor|to conformational rearrangements of the cytoplasmic ends of transmembrane segments]] that enable the Gs heterotrimer to bind the receptor. GDP is released from the α subunit upon formation of β2AR–Gs complex. The GTP binds to the nucleotide-free α subunit resulting in dissociation of the α and βγ subunits from the receptor. The subunits regulate their respective effector proteins adenylyl cyclase (AC) and Ca2+ channels. The Gs heterotrimer reassembles from α and βγ subunits following hydrolysis of GTP to GDP in the α subunit. | The figure shows the G Protein cycle <ref>doi:10.1038/nature10361</ref> - an extracellular agonist binds to the β2AR leads [[Group:SMART:A Physical Model of the β2-Adrenergic Receptor|to conformational rearrangements of the cytoplasmic ends of transmembrane segments]] that enable the Gs heterotrimer to bind the receptor. GDP is released from the α subunit upon formation of β2AR–Gs complex. The GTP binds to the nucleotide-free α subunit resulting in dissociation of the α and βγ subunits from the receptor. The subunits regulate their respective effector proteins adenylyl cyclase (AC) and Ca2+ channels. The Gs heterotrimer reassembles from α and βγ subunits following hydrolysis of GTP to GDP in the α subunit. | ||