|Detection of Human and Mouse Cyclin B2 by Western Blot. Western blot shows lysates of HeLa human cervical epithelial carcinoma cell line and NIH‑3T3 mouse embryonic fibroblast cell line. Gels were loaded with 30 µg of whole cell lysate (WCL), 20 µg of cytoplasmic (Cyto), and 10 µg of nuclear extracts (Nuc). PVDF Membrane was probed with 0.5 µg/mL of Goat Anti-Human/Mouse Cyclin B2 Antigen Affinity-purified Polyclonal Antibody (Catalog # AF6004) followed by HRP-conjugated Anti-Goat IgG Secondary Antibody (Catalog # HAF017). A specific band was detected for Cyclin B2 at approximately 55 kDa (as indicated). This experiment was conducted under reducing conditions and using Immunoblot Buffer Group 1.|
Cyclin B2 (also CCNB2 and G2/mitotic-specific Cyclin B2) is a 48-54 kDa member of the cyclin AB subfamily, cyclin family of proteins. It is widely expressed and associates with CDK1. Here, it provides substrate specificity to a phosphorylating complex. A phosphor‑CDK1:Cyclin B2 complex is associated with the Golgi apparatus, where it contributes to Golgi fragmentation during mitosis. It is also possible that Cyclin B2 can substitute for Cyclin B1 during the early stages of mitosis. Human Cyclin B2 is 398 amino acids (aa) in length. It contains two cyclin box folds (aa 201‑290 and 298‑383) and two substrate binding sites (aa 165‑254 and 264‑347). Phosphorylation occurs at Ser92, Thr94, Ser99, Ser204, Ser392 and Ser398. Over aa 1‑101, human Cyclin B2 shares 79% aa identity with mouse Cyclin B2.
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