National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)
GM141908
United States
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)
GM058600
United States
Citation
Journal: bioRxiv / Year: 2025 Title: Monoclonal nanobodies alter the activity and assembly of the yeast vacuolar H-ATPase. Authors: Kassidy Knight / Jun Bae Park / Rebecca A Oot / Md Murad Khan / Soung-Hun Roh / Stephan Wilkens / Abstract: The vacuolar ATPase (V-ATPase; VV) is a multi-subunit rotary nanomotor proton pump that acidifies organelles in virtually all eukaryotic cells, and extracellular spaces in some specialized tissues of ...The vacuolar ATPase (V-ATPase; VV) is a multi-subunit rotary nanomotor proton pump that acidifies organelles in virtually all eukaryotic cells, and extracellular spaces in some specialized tissues of higher organisms. Evidence suggests that metastatic breast cancers mislocalize V-ATPase to the plasma membrane to promote cell survival and facilitate metastasis, making the V-ATPase a potential drug target. We have generated a library of camelid single-domain antibodies (Nanobodies; Nbs) against lipid-nanodisc reconstituted yeast V-ATPase V proton channel subcomplex. Here, we present an in-depth characterization of three anti-V Nbs using biochemical and biophysical experiments. We find that the Nbs bind V with high affinity, with one Nb inhibiting holoenzyme activity and another one preventing enzyme assembly. Using cryoEM, we find that two of the Nbs bind the subunit ring of the V on the lumen side of the complex. Additionally, we show that one of the Nbs raised against yeast V can pull down human V-ATPase (VV). Our research demonstrates Nb versatility to target and modulate the activity of the V-ATPase, and highlights the potential for future therapeutic Nb development.
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