Product Pathways - Cell Cycle / Checkpoint
Cyclin B1 (D5C10) XP® Rabbit mAb #12231
|W IP IF-IC F||H R||Endogenous||58||Rabbit IgG|
Reactivity Key: H=Human R=Rat
Species cross-reactivity is determined by western blot. Species enclosed in parentheses are predicted to react based on 100% sequence homology.
Specificity / Sensitivity
Cyclin B1 (D5C10) XP® Rabbit mAb recognizes endogenous levels of total cyclin B1 protein. This antibody also detects a 100 kDa protein of unknown origin in some cell lines.
Source / Purification
Monoclonal antibody is produced by immunizing animals with a synthetic peptide corresponding to residues near the amino terminus of human cyclin B1 protein.
Western blot analysis of extracts from various cell lines using Cyclin B1 (D5C10) XP® Rabbit mAb.
Western blot analysis of extracts from HT-29 cells, synchronized in S-phase by double thymidine block (2 nM, 16 hr) followed by release into fresh media for the indicated time, using Cyclin B1 (D5C10) XP® Rabbit mAb (upper) or β-Actin (D6A8) Rabbit mAb #8457 (lower).
Flow cytometric analysis of Jurkat cells using Cyclin B1 (D5C10) XP® Rabbit mAb and Propidium Iodide (PI)/RNase Staining Solution #4087 (DNA content). Anti-rabbit IgG (H+L), F(ab')2 Fragment (Alexa Fluor® 488 Conjugate) #4412 was used as a secondary antibody.
Cyclins are a family of proteins that activate specific cyclin-dependent kinases required for progression through the cell cycle. The entry of all eukaryotic cells into mitosis is regulated by activation of cdc2/cdk1 at the G2/M transition. This activation is a multi-step process that begins with the binding of the regulatory subunit, cyclin B1, to cdc2/cdk1 to form the mitosis-promoting factor (MPF). MPF remains in the inactive state until phosphorylation of cdc2/cdk1 at Thr161 by cdk activating kinase (CAK) (1,2) and dephosphorylation of cdc2/cdk1 at Thr14/Tyr15 by cdc25C (3-5). Four cyclin B1 phosphorylation sites (Ser126, 128, 133, and 147) are located in the cytoplasmic retention signal (CRS) domain and are thought to regulate the translocation of cyclin B1 to the nucleus at the G2/M checkpoint, promoting nuclear accumulation and initiation of mitosis (6-9). While MPF itself can phosphorylate Ser126 and Ser128, polo-like kinase 1 (PLK1) phosphorylates cyclin B1 preferentially at Ser133 and possibly at Ser147 (6,10). At the end of mitosis, cyclin B1 is targeted for degradation by the anaphase-promoting complex (APC), allowing for cell cycle progression (11). Research studies have shown that cyclin B1 is overexpressed in breast, prostate, and non-small cell lung cancers (12-14).
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For Research Use Only. Not For Use In Diagnostic Procedures.