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Angiotensinogen fine-tunes the tightly controlled activity of the renin-angiotensin system by modulating the release of angiotensin peptides that control blood pressure. One mechanism by which this modulation is achieved is via angiotensinogen's Cys18–Cys138 disulfide bond that acts as a redox switch. Molecular dynamics simulations of each redox state of angiotensinogen reveal subtle dynamic differences between the reduced and oxidised forms, particularly at the N-terminus. Surface plasmon resonance data demonstrate that the two redox forms of angiotensinogen display different binding kinetics to an immobilised anti-angiotensinogen monoclonal antibody. Mass spectrometry mapped the epitope for the antibody to the N-terminal region of angiotensinogen. We therefore provide evidence that the different redox forms of angiotensinogen can be detected by an antibody-based detection method.

biochemical journal

Molecular basis of a redox switch: molecular dynamics simulations and surface plasmon resonance provide insight into reduced and oxidised angiotensinogen