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MG132

Chemical compound

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Through Ligand (biochemistry)

Molecular mechanism

There are several inhibitors that can readily enter cell and selectively inhibit degradative pathway. It includes peptide aldehydes, such as Cbz-leu-leu-leucinal (MG132), Cbz-leu-leu-norvalinal (MG115) and acetyl-leu-leu-norleucinal (ALLN). These are substrate analogues and potent transition-state inhibitors of chymotrypsin like activity of proteasome machinery. The peptide aldehydes are also known to inhibit certain lysosomal cysteine proteases and the calpains hence MG132 may not be exclusive inhibitor of proteasomal pathway.

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