Journal: Proc Natl Acad Sci U S A / Year: 2022 Title: Identification of mEAK-7 as a human V-ATPase regulator via cryo-EM data mining. Authors: Longfei Wang / Di Wu / Carol V Robinson / Tian-Min Fu / Abstract: Vacuolar-type adenosine triphosphatases (V-ATPases) not only function as rotary proton pumps in cellular organelles but also serve as signaling hubs. To identify the endogenous binding partners of V- ...Vacuolar-type adenosine triphosphatases (V-ATPases) not only function as rotary proton pumps in cellular organelles but also serve as signaling hubs. To identify the endogenous binding partners of V-ATPase, we collected a large dataset of human V-ATPases and did extensive classification and focused refinement of human V-ATPases. Unexpectedly, about 17% of particles in state 2 of human V-ATPases display additional density with an overall resolution of 3.3 Å. Structural analysis combined with artificial intelligence modeling enables us to identify this additional density as mEAK-7, a protein involved in mechanistic target of rapamycin (mTOR) signaling in mammals. Our structure shows that mEAK-7 interacts with subunits A, B, D, and E of V-ATPases in state 2. Thus, we propose that mEAK-7 may regulate V-ATPase function through binding to V-ATPases in state 2 as well as mediate mTOR signaling.
EMPIAR-11132 (Title: Cryo-EM structures of human V-ATPase / Data size: 8.4 TB Data #1: Unaligned multi frame micrographs of human V-ATPase in complex with SidK [micrographs - multiframe])
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