Allosteric activation of a spring-loaded natriuretic peptide receptor dimer by hormone - PubMed (original) (raw)

. 2001 Aug 31;293(5535):1657-62.

doi: 10.1126/science.1062246.

Affiliations

• PMID: 11533490
• DOI: 10.1126/science.1062246

Allosteric activation of a spring-loaded natriuretic peptide receptor dimer by hormone

He Xl et al. Science. 2001.

Abstract

Natriuretic peptides (NPs) are vasoactive cyclic-peptide hormones important in blood pressure regulation through interaction with natriuretic cell-surface receptors. We report the hormone-binding thermodynamics and crystal structures at 2.9 and 2.0 angstroms, respectively, of the extracellular domain of the unliganded human NP receptor (NPR-C) and its complex with CNP, a 22-amino acid NP. A single CNP molecule is bound in the interface of an NPR-C dimer, resulting in asymmetric interactions between the hormone and the symmetrically related receptors. Hormone binding induces a 20 angstrom closure between the membrane-proximal domains of the dimer. In each monomer, the opening of an interdomain cleft, which is tethered together by a linker peptide acting as a molecular spring, is likely a conserved allosteric trigger for intracellular signaling by the natriuretic receptor family.

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