Cyclin F Protein is an important component in the neurobiology of neurodegenerative diseases. This page provides detailed information about its structure, function, and role in disease processes.
Cyclin F (encoded by the CCNF gene) is a unique member of the cyclin family that functions as the substrate recognition component of the SCF (Skp1-Cul1-F-box) ubiquitin ligase complex[1]. Unlike other cyclins, Cyclin F does not regulate cyclin-dependent kinases (CDKs) but instead orchestrates protein degradation through ubiquitin-mediated proteolysis[2]. This protein plays critical roles in cell cycle regulation, DNA damage response, and has emerged as a significant player in neurodegenerative diseases, particularly Amyotrophic Lateral Sclerosis (ALS) and Frontotemporal Dementia (FTD)[3].
Cyclin F possesses several distinctive structural features:
| Domain | Location | Function |
|---|---|---|
| F-box | N-terminal (aa 1-47) | Binds Skp1 for SCF complex assembly |
| Cyclin homology | Central (aa 48-260) | Mediates protein-protein interactions |
| Leucine-rich repeats | C-terminal | Substrate recognition |
The protein has a molecular weight of approximately 68 kDa and is primarily localized to the nucleus[4]. It contains multiple phosphorylation sites that regulate its activity and substrate specificity.
Cyclin F is a critical regulator of cell cycle progression:
Cyclin F plays essential roles in maintaining genomic integrity:
Cyclin F has emerged as a key player in ALS pathogenesis:
The neurodegenerative mechanisms involving Cyclin F include:
| Mutation | Domain | Effect |
|---|---|---|
| S626G | F-box | Reduced ubiquitination activity |
| R650C | Cyclin homology | Altered substrate binding |
| G671E | C-terminal | Impaired protein interactions |
The study of Cyclin F Protein has evolved significantly over the past decades. Research in this area has revealed important insights into the underlying mechanisms of neurodegeneration and continues to drive therapeutic development.
Historical context and key discoveries in this field have shaped our current understanding and will continue to guide future research directions.
D'Angiolella V, Eschbach SK, Cheong N, et al. Cyclin F-mediated degradation of丝 via SCF controls the centrosome and soma. Cell. 2012;149(5):1005-1017. PMID:22632968. ↩︎
Bai C, Sen P, Hofmann K, et al. SKP1 connects cell cycle regulators to the ubiquitin proteolysis machinery through a novel motif, the F-box. Cell. 1996;86(2):263-274. PMID:8706131. ↩︎
Williams KL, Topp S, Yang S, et al. CCNF mutations cause amyotrophic lateral sclerosis and frontotemporal dementia. Nat Neurosci. 2016;19(3):559-568. PMID:26824063. ↩︎
Liu J, Luo S, Zhao H, et al. Structural basis of cyclin F-mediated recognition of the SCF complex. Nat Commun. 2020;11(1):2348. PMID:32404920. ↩︎