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Related Experiment Video

Updated: Feb 11, 2026

Author Spotlight: Investigating Viral Disruption of Intestinal Epithelial Signaling – Research Insights and Future Directions

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Structural basis for CDK6 activation by a virus-encoded cyclin.

Ursula Schulze-Gahmen¹, Sung-Hou Kim

¹Physical Bioscience Division at E. O. Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA.

Nature Structural Biology

|February 6, 2002

Summary

Herpesvirus saimiri cyclin (Vcyclin) forms highly active complexes with human cyclin-dependent kinase 6 (CDK6), resisting inhibition. Structural analysis reveals unique Vcyclin interactions stabilizing the CDK6--Vcyclin complex.

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Area of Science:

Structural biology
Virology
Molecular oncology

Background:

Viral cyclins, such as Vcyclin from herpesvirus saimiri, are known to interact with host cell cycle machinery.
Cyclin-dependent kinases (CDKs) regulate the cell cycle, and their dysregulation is implicated in cancer.

Purpose of the Study:

To elucidate the structural basis for the preferential binding and enhanced activity of Vcyclin with CDK6.
To understand the molecular mechanisms underlying the resistance of CDK6--Vcyclin complexes to CDK inhibitors.

Main Methods:

X-ray crystallography was used to determine the 3.1 A resolution structure of the human CDK6--Vcyclin complex in an active state.
Structural comparisons were made with known CDK--cyclin complexes, such as CDK2--cyclinA.

Main Results:

The CDK6--Vcyclin complex exhibits features similar to active, phosphorylated CDK2--cyclinA but with distinct T-loop conformations.
Specific interactions involving Vcyclin's N-terminal extension forming a beta-sheet with the CDK6 T-loop were identified.
The CDK6--Vcyclin interface is significantly larger (20%) than that of CDK2--cyclinA, contributing to specificity and inhibitor resistance.

Conclusions:

Vcyclin specifically binds and activates CDK6 through unique structural interactions, leading to enhanced kinase activity.
These interactions confer resistance to cyclin-dependent kinase inhibitors (CDKIs), suggesting potential implications for viral pathogenesis and cancer therapy.