Anti-Bub3

0.5mg/ml if reconstituted with 0.2ml sterile DI water. Budding uninhibited by benzimidazoles 3 is a protein that in humans is encoded by the BUB3 gene. It is a protein involved with the regulation of the Spindle Assembly Checkpoint (SAC), though Bub3 is non-essential in yeast, it is essential in higher eukaryotes. As one of the checkpoint proteins, it delays the irreversible onset of anaphase through direction of kinetochore localization during prometaphase to achieve biorentation. Bub3 directs the localization of Bub1 at the kinetochore in order to activate the SAC. It also acts as a regulator in that it affects binding of Mad3 to Mad2. Protein function: Has a dual function in spindle-assembly checkpoint signaling and in promoting the establishment of correct kinetochore-microtubule (K-MT) attachments. Promotes the formation of stable end-on bipolar attachments. Necessary for kinetochore localization of BUB1. Regulates chromosome segregation during oocyte meiosis. The BUB1/BUB3 complex plays a role in the inhibition of anaphase-promoting complex or cyclosome (APC/C) when spindle-assembly checkpoint is activated and inhibits the ubiquitin ligase activity of APC/C by phosphorylating its activator CDC20. This complex can also phosphorylate MAD1L1. [The UniProt Consortium]