Key result
The ANP receptor extracellular domain complexed with ANP was crystallized using 3.4 M ammonium sulfate as a cryoprotectant, yielding crystals that diffracted to 3.1 A resolution.
The study successfully crystallized the rat ANP receptor extracellular domain complexed with ANP, diffracting to 3.1 A resolution, enabling future structural analysis.
Enables atomic-level ANP receptor studies; leaves open clinical translation in cardiovascular disease pending human validation.
Atrial natriuretic peptide (ANP) plays a major role in blood pressure and volume regulation owing to its natriuretic and vasodilatory activities. The ANP receptor is a single-span transmembrane receptor coupled to its intrinsic guanylyl cyclase activity. The extracellular hormone-binding domain of rat ANP receptor (ANPR) was overexpressed by permanent transfection in CHO cells and purified. ANPR complexed with ANP was crystallized at 301 K by the hanging-drop vapor-diffusion method. The crystals were frozen in 3.4 M ammonium sulfate used as a cryoprotectant. The crystals diffracted to 3.1 A resolution using synchrotron radiation and belonged to the hexagonal space group P6(1), with unit-cell parameters a = b = 100.3, c = 258.6 A.
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Ogawa et al. (2003) studied this question. Crystallization of ANP receptor extracellular domain complex with ANP was evaluated on Crystallization and X-ray diffraction resolution. The ANP receptor extracellular domain complexed with ANP was crystallized using 3.4 M ammonium sulfate as a cryoprotectant, yielding crystals that diffracted to 3.1 A resolution.
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