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• W2074946691 abstract "We recently cloned a cDNA encoding the 29-kDa subunit of human red blood cell regulator (REG), a potent activator of the multicatalytic protease (Realini, C., Dubiel, W., Pratt, G., Ferrell, K., and Rechsteiner, M.(1994) J. Biol. Chem. 269, 20727-20732). The sequence of this subunit contains 28 “alternating” lysine and glutamic acid residues (a KEKE motif). Similar regions are present in a number of Ca2+-binding proteins, and using standard filter assays, the recombinant protein is shown to bind 45Ca2+ and ruthenium red. 45Ca2+ is also bound to a ubiquitin extension protein containing the 28-residue KEKE region from the 29-kDa REG subunit. Thus, the 29-kDa REG subunit is a Ca2+-binding protein, and its KEKE region is able to bind divalent cations. Ca2+ reversibly inhibits the enhanced peptidase activity of complexes between the multicatalytic protease and recombinant REG. This raises the possibility that multicatalytic protease activity is regulated by calcium in vivo. We recently cloned a cDNA encoding the 29-kDa subunit of human red blood cell regulator (REG), a potent activator of the multicatalytic protease (Realini, C., Dubiel, W., Pratt, G., Ferrell, K., and Rechsteiner, M.(1994) J. Biol. Chem. 269, 20727-20732). The sequence of this subunit contains 28 “alternating” lysine and glutamic acid residues (a KEKE motif). Similar regions are present in a number of Ca2+-binding proteins, and using standard filter assays, the recombinant protein is shown to bind 45Ca2+ and ruthenium red. 45Ca2+ is also bound to a ubiquitin extension protein containing the 28-residue KEKE region from the 29-kDa REG subunit. Thus, the 29-kDa REG subunit is a Ca2+-binding protein, and its KEKE region is able to bind divalent cations. Ca2+ reversibly inhibits the enhanced peptidase activity of complexes between the multicatalytic protease and recombinant REG. This raises the possibility that multicatalytic protease activity is regulated by calcium in vivo." @default.
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• W2074946691 date "1995-12-01" @default.
• W2074946691 modified "2023-09-30" @default.
• W2074946691 title "A Proteasome Activator Subunit Binds Calcium" @default.
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• W2074946691 doi "https://doi.org/10.1074/jbc.270.50.29664" @default.
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