– The S-phase Kinase-Associated Protein 1 (SKP1) is a core component of the SKP1, Cullin 1, F-box protein (SCF) complex, an E3 ubiquitin ligase that serves to poly-ubiquitinate a vast array of protein targets as a signal for their proteasomal degradation, thereby playing a critical role in the regulation of downstream biological processes. SKP1 Protein, Human, Recombinant (His, Avi) is expressed in HEK293 mammalian cells with N-His and C-Avi tag. The predicted molecular weight is 21.43 kDa and the accession number is P63208-1.