Gene/Protein Disease Symptom Drug Enzyme Compound
Pivot Concepts:   Target Concepts:
Query: EC:2.7.11.22 (cdc2)
 8,319 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

Cyclin A/Cdk2 plays an important role during S and G2/M phases of the eukaryotic cell cycle, but the mechanisms by which it regulates cell cycle events are not fully understood. We have biochemically purified and identified SCAPER, a novel protein that specifically interacts with cyclin A/Cdk2 in vivo. Its expression is cell cycle independent, and it associates with cyclin A/Cdk2 at multiple phases of the cell cycle. SCAPER localizes primarily to the endoplasmic reticulum. Ectopic expression of SCAPER sequesters cyclin A from the nucleus and results specifically in an accumulation of cells in M phase of the cell cycle. RNAi-mediated depletion of SCAPER decreases the cytoplasmic pool of cyclin A and delays the G1/S phase transition upon cell cycle re-entry from quiescence. We propose that SCAPER represents a novel cyclin A/Cdk2 regulatory protein that transiently maintains this kinase in the cytoplasm. SCAPER could play a role in distinguishing S phase- from M phase-specific functions of cyclin A/Cdk2.
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PMID:SCAPER, a novel cyclin A-interacting protein that regulates cell cycle progression. 1769 6

Cyclin A is a key regulator of DNA replication and mitosis, and cyclin A/Cdk2 activity is critical for progression of cells from G(1)/S to M phase of the cell cycle. There is abundant evidence that cyclin A is predominantly localized to, and functions in, the nucleus, and a number of nuclear cyclin A/Cdk2 substrates have been identified. Evidence supporting the presence of cyclin A and its associated activity in the cytoplasm have also been reported, but the biological significance of this cyclin/Cdk pool during cell cycle progression remains controversial. Recently, we identified and characterized a new cyclin A/Cdk2 substrate named SCAPER which is localized to the endoplasmic reticulum. By sequestering cyclin A/Cdk2, SCAPER is capable of directing the activity of this kinase complex away from the nucleus and regulating cyclin A/Cdk2 equilibrium in distinct subcellular compartments. This work paves new avenues for understanding the role of cytoplasmic cyclin A/Cdk2 and its potential contribution to cancer and tumor formation.
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PMID:Double identity of SCAPER: a substrate and regulator of cyclin A/Cdk2. 1824 51