Abstract
ANF-RGC membrane guanylate cyclase is the receptor for the hypotensive peptide hormones, atrial natriuretic factor (ANF) and type B natriuretic peptide (BNP). It is a single transmembrane spanning protein. Binding the hormone to the extracellular domain activates its intracellular catalytic domain. This results in accelerated production of cyclic GMP, a second messenger in controlling blood pressure, cardiac vasculature, and fluid secretion. ATP is the obligatory transducer of the ANF signal. It works through its ATP regulated module, ARM, which is juxtaposed to the C-terminal side of the transmembrane domain. Upon interaction, ATP induces a cascade of temporal and spatial changes in the ARM, which, finally, result in activation of the catalytic module. Although the exact nature and the details of these changes are not known, some of these have been stereographed in the simulated three-dimensional model of the ARM and validated biochemically. Through comprehensive techniques of steady state, time-resolved tryptophan fluorescence and Forster Resonance Energy Transfer (FRET), site-directed and deletion-mutagenesis, and reconstitution, the present study validates and explains the mechanism of the model-based predicted transduction role of the ARM’s structural motif, 669WTAPELL675. This motif is critical in the ATP-dependent ANF signaling. Molecular modeling shows that ATP binding exposes the 669WTAPELL675 motif, the exposure, in turn, facilitates its interaction and activation of the catalytic module. These principles of the model have been experimentally validated. This knowledge brings us a step closer to our understanding of the mechanism by which the ATP-dependent spatial changes within the ARM cause ANF signaling of ANF-RGC.
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Abbreviations
- ANF:
-
Atrial natriuretic factor
- BNP:
-
B-type natriuretic peptide
- ANF-RGC:
-
Atrial natriuretic factor receptor guanylate cyclase
- ARM:
-
ATP regulated module
- FRET:
-
Förster resonance energy transfer
- Mant-ATP:
-
2′-0-(N-methylantraniloyl)-adenosine 5′-triphosphate
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Acknowledgment
This study was supported by NIH grants HL 070015, HL084584 (TD), DC 005349 (RKS), MD001633 (SB), and Texas Emerging Technologies Grant (IG and ZG)
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Duda, T., Bharill, S., Wojtas, I. et al. Atrial natriuretic factor receptor guanylate cyclase signaling: new ATP-regulated transduction motif. Mol Cell Biochem 324, 39–53 (2009). https://doi.org/10.1007/s11010-008-9983-2
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DOI: https://doi.org/10.1007/s11010-008-9983-2