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The video (often labeled as Video S4 in the study) demonstrates that GPR4 does not just turn "on" or "off." Instead, it follows a stepwise activation path:
As acid levels rise, a second "cluster" involving the ECL2 loop transforms from a short hairpin into a long, protruding beta-sheet. This structural "swing" fully stabilizes the receptor in its active state. 3. Why This Matters lfflllrr.mp4
This research, authored by Kezheng Zhang and colleagues, provides the first structural snapshots of these "pH sensors" in action, moving from inactive to active states as they detect protons. The video (often labeled as Video S4 in
A specific residue (H269) becomes protonated first, initiating a partial change in the receptor's shape. authored by Kezheng Zhang and colleagues
