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Sec63/Sec62 complex-interacting family This is a family of closely related Hph proteins that are integral endoplasmic reticulum (ER) membrane proteins required for yeast survival under environmental stress conditions. They interact with several subunits of the Sec63/Sec62 complex that mediates post-translational translocation of proteins into the ER. Cells with mutant Hph1 and Hph2 proteins revealed phenotypes resembling those of mutants defective for vacuolar proton ATPase (V-ATPase) activity. The yeast V-ATPase is a multisubunit complex whose function, structure, and assembly have been well characterized. Cells with impaired V-ATPase activity fail to acidify the vacuole, cannot grow at alkaline pH, and are sensitive to high concentrations of extracellular calcium. |
Jiyao W et al.(2023). "The conserved domain database in 2023.",