Key Points
- To determine the regulatory and catalytic functions of the intracellular protein kinase-like domain in the atrial natriuretic peptide (ANP) receptor-guanylate cyclase.
- Generated deletion mutants lacking the intracellular protein kinase-like domain of the membrane-bound ANP receptor.
- Assayed guanylate cyclase activity and cGMP production in response to ANP binding and ATP or ATP-analog stimulation.
- Demonstrated that the protein kinase-like domain functions as a regulatory repressor, while the adjacent domain provides catalytic guanylate cyclase activity.
- Deletion of the kinase-like domain produced constitutive guanylate cyclase activity that was independent of ANP binding and showed markedly reduced stimulation by ATP.
Structured PICO
PPopulationIn vitro model studying the plasma membrane form of guanylate cyclase (atrial natriuretic peptide receptor)
IInterventionDeletion mutagenesis of the protein kinase-like domain
CComparatorWild-type ANP receptor
OOutcomeGuanylate cyclase activity and its dependence on ANP and ATPsurrogate
The protein kinase-like domain of the ANP receptor acts as a regulatory element, repressing guanylate cyclase activity until ANP binding induces a conformational change.