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Updated: Jul 7, 2026

Identification of Cyclin-dependent Kinase 1 Specific Phosphorylation Sites by an In Vitro Kinase Assay
Published on: May 3, 2018
Double identity of SCAPER: a substrate and regulator of cyclin A/Cdk2
William Y Tsang1, Brian David Dynlacht
1New York University School of Medicine, Department of Pathology, New York, New York 10016, USA.
Abstract:
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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