Caspase-3-mediated cleavage of Cdc6 induces nuclear localization of p49-truncated Cdc6 and apoptosis
- Title
- Caspase-3-mediated cleavage of Cdc6 induces nuclear localization of p49-truncated Cdc6 and apoptosis
- Author
- 임형신
- Issue Date
- 2003-10
- Publisher
- American Society for Cell Biology
- Citation
- Molecular Biology of the Cell, v. 14, no. 10, page. 4250-4259
- Abstract
- We show that Cdc6, an essential initiation factor for DNA replication, undergoes caspase-3–mediated cleavage in the early stages of apoptosis in HeLa cells and SK-HEP-1 cells induced by etoposide, paclitaxel, ginsenoside Rh2, or tumor necrosis factor-related apoptosis-inducing ligand. The cleavage occurs at the SEVD442/G motif and generates an N-terminal truncated Cdc6 fragment (p49-tCdc6) that lacks the carboxy-terminal nuclear export sequence. Cdc6 is known to be phosphorylated by cyclin A-cyclin dependent kinase 2 (Cdk2), an event that promotes its exit from the nucleus and probably blocks it from initiating inappropriate DNA replication. In contrast, p49-tCdc6 translocation to the cytoplasm is markedly reduced under the up-regulated conditions of Cdk2 activity, which is possibly due to the loss of nuclear export sequence. Thus, truncation of Cdc6 results in an increased nuclear retention of p49-tCdc6 that could act as a dominant negative inhibitor of DNA replication and its accumulation in the nucleus could promote apoptosis. Supporting this is that the ectopic expression of p49-tCdc6 not only promotes apoptosis of etoposide-induced HeLa cells but also induces apoptosis in untreated cells. Thus, the caspase-mediated cleavage of Cdc6 creates a truncated Cdc6 fragment that is retained in the nucleus and induces apoptosis.
- URI
- https://www.molbiolcell.org/doi/10.1091/mbc.e03-01-0029https://repository.hanyang.ac.kr/handle/20.500.11754/156398
- ISSN
- 1939-4586
- DOI
- 10.1091/mbc.e03-01-0029 Sections View PDF
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- COLLEGE OF PHARMACY[E](약학대학) > PHARMACY(약학과) > Articles
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