Product Pathways - Cell Cycle / Checkpoint
Cdc45 Antibody #3673
|W||H M R Mk||Endogenous||65||Rabbit|
Reactivity Key: H=Human M=Mouse R=Rat Mk=Monkey
Species cross-reactivity is determined by western blot. Species enclosed in parentheses are predicted to react based on 100% sequence homology.
Specificity / Sensitivity
Cdc45 Antibody recognizes endogenous levels of total cdc45 protein.
Source / Purification
Polyclonal antibodies are produced by immunizing animals with a synthetic peptide corresponding to the carboxy terminus of human cdc45 protein. Antibodies are purified using protein A and peptide affinity chromatography.
The initiation of DNA replication in mammalian cells is a highly coordinated process that ensures duplication of the genome only once per cell division cycle. Origins of replication are dispersed throughout the genome and their activities are regulated via the sequential binding of pre-replication and replication factors. The origin recognition complex (ORC) is thought to bind to chromatin throughout the cell cycle (1,2). The pre-replication complex (Pre-RC) forms in late mitosis/early G1 phase with the binding of CDT1 and cdc6 to the origin, which allows binding of the heterohexameric MCM2-7 complex. The MCM complex is thought to be the replicative helicase and formation of the Pre-RC is referred to as chromatin licensing. Subsequent initiation of DNA replication requires the activation of the S-phase promoting kinases cdk2 and cdc7. Cdc7 phosphorylates MCM proteins bound to chromatin and, in conjunction with CDT1, recruits the replication factor cdc45 (3-5). Cdc45 is required for formation of pre-initiation complexes at the G1/S transition and for activation of replication origins. The level of cdc45 protein expression is associated with the proliferative status of the cell or tissue. Terminally differentiated and senescent cells lack cdc45 and highly proliferative cell lines express high levels of cdc45 (6).
- Okuno, Y. et al. (2001) EMBO J 20, 4263-77.
- McNairn, A.J. et al. (2005) Exp Cell Res 308, 345-56.
- Bell, S.P. and Dutta, A. (2002) Annu Rev Biochem 71, 333-74.
- Tsuji, T. et al. (2006) Mol Biol Cell 17, 4459-72.
- Ballabeni, A. et al. (2009) J Biol Chem 284, 3028-36.
- Pollok, S. et al. (2007) FEBS J 274, 3669-84.
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For Research Use Only. Not For Use In Diagnostic Procedures.