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- W4362520565 abstract "Myoregulin (MLN) is a member of the regulin family, a group of homologous membrane proteins that bind to and regulate the activity of the sarcoplasmic reticulum Ca2+-ATPase (SERCA). MLN, which is expressed in skeletal muscle, contains an acidic residue in its transmembrane domain. The location of this residue, Asp35, is unusual because the relative occurrence of aspartate is very rare (<0.2%) within the transmembrane helix regions. Therefore, we used atomistic simulations and ATPase activity assays of protein co-reconstitutions to probe the functional role of MLN residue Asp35. These structural and functional studies showed Asp35 has no effects on SERCA's affinity for Ca2+ or the structural integrity of MLN in the lipid bilayer. Instead, Asp35 controls SERCA inhibition by populating a bound-like orientation of MLN. We propose Asp35 provides a functional advantage over other members of the regulin family by populating preexisting MLN conformations required for MLN-specific regulation of SERCA. Overall, this study provides new clues about the evolution and functional divergence of the regulin family and offers novel insights into the functional role of acidic residues in transmembrane protein domains." @default.
- W4362520565 created "2023-04-06" @default.
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- W4362520565 date "2023-04-04" @default.
- W4362520565 modified "2023-09-26" @default.
- W4362520565 title "Functional Role of an Unusual Transmembrane Acidic Residue in the Calcium Pump Regulator Myoregulin" @default.
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- W4362520565 doi "https://doi.org/10.1021/acs.biochem.3c00026" @default.
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