Front Cardiovasc Med. 2021 Mar 18;8:645123. doi: 10.3389/fcvm.2021.645123. eCollection 2021.
Angiotensinogen and the Modulation of Blood Pressure.
Frontiers in cardiovascular medicine
Zimei Shu, Jiahui Wan, Randy J Read, Robin W Carrell, Aiwu Zhou
Affiliations
Affiliations
- Department of Pathophysiology, Shanghai Jiao Tong University School of Medicine, Shanghai, China.
- Department of Haematology, Cambridge Institute for Medical Research, University of Cambridge, Cambridge, United Kingdom.
PMID: 33816576
PMCID: PMC8012498 DOI: 10.3389/fcvm.2021.645123
Abstract
The angiotensin peptides that control blood pressure are released from the non-inhibitory plasma serpin, angiotensinogen, on cleavage of its extended N-terminal tail by the specific aspartyl-protease, renin. Angiotensinogen had previously been assumed to be a passive substrate, but we describe here how recent studies reveal an inherent conformational mechanism that is critical to the cleavage and release of the angiotensin peptides and consequently to the control of blood pressure. A series of crystallographic structures of angiotensinogen and its derivative forms, together with its complexes with renin show in molecular detail how the interaction with renin triggers a profound shift of the amino-terminal tail of angiotensinogen with modulation occurring at several levels. The tail of angiotensinogen is restrained by a labile disulfide bond, with changes in its redox status affecting angiotensin release, as demonstrably so in the hypertensive complication of pregnancy, pre-eclampsia. The shift of the tail also enhances the binding of renin through a tail-in-mouth allosteric mechanism. The N-terminus is now seen to insert into a pocket equivalent to the hormone-binding site on other serpins, with helix H of angiotensinogen unwinding to form key interactions with renin. The findings explain the precise species specificity of the interaction with renin and with variant carbohydrate linkages. Overall, the studies provide new insights into the physiological regulation of angiotensin release, with an ability to respond to local tissue and temperature changes, and with the opening of strategies for the development of novel agents for the treatment of hypertension.
Copyright © 2021 Shu, Wan, Read, Carrell and Zhou.
Keywords: allosteric; angiotensinogen; hypertension; pre-eclampsia; redox switch; renin; serpin; tail-in-mouth
Conflict of interest statement
The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.
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