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- W1585331386 abstract "Reticulocytes contain a nonlysosomal, ATP-dependent system for degrading abnormal proteins and normal proteins during cell maturation. Vanadate, which inhibits several ATPases including the ATP-dependent proteases in Escherichia coli and liver mitochondria, also markedly reduced the ATP-dependent degradation of proteins in reticulocyte extracts. At low concentrations (K1 = 50 microM), vanadate inhibited the ATP-dependent hydrolysis of [3H]methylcasein and denatured 125I-labeled bovine serum albumin, but it did not reduce the low amount of proteolysis seen in the absence of ATP. This inhibition by vanadate was rapid in onset, reversed by dialysis, and was not mimicked by molybdate. Vanadate inhibits proteolysis at an ATP-stimulated step which is independent of the ATP requirement for ubiquitin conjugation to protein substrates. When the amino groups on casein and bovine serum albumin were covalently modified so as to prevent their conjugation to ubiquitin, the derivatized proteins were still degraded by an ATP-stimulated process that was inhibited by vanadate. In addition, vanadate did not reduce the ATP-dependent conjugation of 125I-ubiquitin to endogenous reticulocyte proteins, although it markedly inhibited their degradation. In intact reticulocytes vanadate also inhibited the degradation of endogenous proteins and of abnormal proteins containing amino acid analogs. This effect was rapid and reversible; however, vanadate also reduced protein synthesis and eventually lowered ATP levels in the intact cells. Vanadate (10 mM) has also been reported to decrease intralysosomal proteolysis in hepatocytes. However, in liver extracts this effect on lysosomal proteases required high concentrations of vanadate (K1 = 500 microM) and was also observed with molybdate, unlike the inhibition of ATP-dependent proteolysis in reticulocytes." @default.
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- W1585331386 date "1984-03-01" @default.
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- W1585331386 title "Vanadate inhibits the ATP-dependent degradation of proteins in reticulocytes without affecting ubiquitin conjugation." @default.
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- W1585331386 doi "https://doi.org/10.1016/s0021-9258(17)43217-0" @default.
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