A cardiac hormone, atrial natriuretic peptide (ANP), plays a major role in blood pressure and volume regulation. ANP activities are mediated by a single span transmembrane receptor carrying intrinsic guanylate cyclase activity. ANP binding to its extrace ...
A cardiac hormone, atrial natriuretic peptide (ANP), plays a major role in blood pressure and volume regulation. ANP activities are mediated by a single span transmembrane receptor carrying intrinsic guanylate cyclase activity. ANP binding to its extracellular domain stimulates guanylate cyclase activity by an as yet unknown mechanism. Here we report the crystal structure of dimerized extracellular hormone-binding domain in complex with ANP. The structural comparison with the unliganded receptor reveals that hormone binding causes the two receptor monomers to undergo an intermolecular twist with little intramolecular conformational change. This motion produces a Ferris wheel-like translocation of two juxtamembrane domains in the dimer with essentially no change in the interdomain distance. This movement alters the relative orientation of the two domains by a shift equivalent to counterclockwise rotation of each by 24 degrees. These results suggest that transmembrane signaling by the ANP receptor is initiated via a hormone-induced rotation mechanism.
Related Citations:
Crystallization and preliminary x-ray analysis of atrial natriuretic peptide (anp) receptor extracellular domain complex with anp: use of ammonium sulfate as the cryosalt Ogawa, H., Zhang, X., Qiu, Y., Ogata, C.M., Misono, K.S. (2003) Acta Crystallogr D Biol Crystallogr 59: 1831
Constitutive activation and uncoupling of the atrial natriuretic peptide receptor by mutations at the dimer interface: role of dimer interface in signaling Qiu, Y., Ogawa, H., Miyagi, M., Misono, K.S. (2004) J Biol Chem 279: 6115
Organizational Affiliation:
Lerner Research Institute, Cleveland Clinic Foundation, Cleveland, OH 44195, USA.
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