Survivin prevents the polycomb repressor complex 2 from methylating histone 3 lysine 27

Area of Science:

• Epigenetics
• Molecular Biology
• Cellular Biology

Background:

• Polycomb Repressive Complex 2 (PRC2) silences gene expression via histone H3 lysine 27 trimethylation.
• Survivin's role in epigenetic regulation is not fully understood.

Purpose of the Study:

• To investigate survivin's function in the epigenetic control of gene transcription.
• To elucidate the interaction between survivin and PRC2.

Main Methods:

• Chromatin immunoprecipitation sequencing (ChIP-seq) to assess survivin and PRC2 colocalization.
• In vitro assays including peptide microarrays, Nuclear Magnetic Resonance (NMR), and Biolayer Interferometry (BLI) to confirm protein interactions.
• Machine learning for predicting protein interactions based on amino acid composition.
• Protein-protein docking simulations.

Main Results:

• Survivin colocalizes with PRC2 on DNA, and its inhibition increases H3K27 trimethylation.
• Survivin directly interacts with PRC2 subunits, particularly EZH2.
• The interaction interface suggests survivin inhibits EZH2's catalytic activity.

Conclusions:

• Survivin acts as an inhibitor of PRC2-mediated gene silencing.
• This study reveals a novel mechanism of epigenetic regulation involving survivin and PRC2.