XIAP, active

X-linked inhibitor of apoptosis (XIAP) is one of a group of intracellular proteins which have been shown to act as endogenous inhibitors of caspases, the enzymatic effectors of apoptosis. XIAP possesses a C-terminal RING domain that functions as an E3 ubiquitin ligase and is able to ubiquitinate a variety of substrates thereby affecting a broad range of cellular activities beyond apoptotic suppression. There is evidence that XIAP plays a significant role in cell division, morphogenesis, heavy metal homeostasis, NF-kB activation and MAP kinase signalling. XIAP expression has been shown to be elevated in several malignancies and so is considered a promising target in anticancer therapies.

Ubiquitination Cascade Comoponent: E3

Purified using glutathione sepharose, followed by gel filtration

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