Cullin proteins assemble a large number of RING E3 ubiquitin ligases and regulate various physiological processes (1). It has been shown that the SKP1, CUL1, F-box (SCF) containing pathway, although similarly used by the mammalian CUL1, is not shared by other cullin members. This implies that most cullins may use a SKP1/F-box-independent pathway to facilitate protein degradation (2). The majority of CUL1 has been found in a complex with CAND1 and ROC1, independent of SKP1 and F-box protein SKP2. Data suggests that CAND1 regulates the formation of the SCF complex, and its dissociation from CUL1 is coupled with the incorporation of F-box proteins into the SCF complex, causing their destabilization (3).
Delta-Notch Signaling Pathway
TGF Beta Signaling Pathway
Wnt Signaling Pathway
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