Clasto-<wbr/>Lactacystin ?-<wbr/>lactone

Clasto-Lactacystin ?-lactone

CAT N°: 70988
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From 100.00 85.00

Lactacystin is a microbial metabolite isolated from Streptomyces that is now widely used as a selective inhibitor of the 20S proteasome.{10086,2351,10073} Clasto-lactacystin ?-lactone was later identified as the active metabolite of lactacystin, resulting from the elimination of cysteine and the formation of a reactive ?-lactone. Both lactacystin and its ?-lactone metabolite induce differentiation and inhibit cell cycle progression in several tumor cell lines.{1659} Clasto-lactacystin ?-lactone irreversibly alkylates subunit X of the 20S proteasome.{10073} It is at least 10 times more active than the parent compound; this increased activity may be a function of increased cell permeability. Inhibition of proteasome peptidase activity results in the accumulation of a variety of ubiquitinated proteins which would normally undergo rapid degradation. Thus, the effects of clasto-lactacystin ?-lactone are pleiotropic and depend substantially on the expression pattern of signaling proteins within the treated cell.

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