Methylation of the retinoblastoma tumor suppressor by SMYD2.

J Biol Chem 2010 Nov 24;285(48):37733-40. Epub 2010 Sep 24.

Departments of Pediatrics, Stanford University, Stanford, California 94305, USA.

The retinoblastoma tumor suppressor (RB) is a central cell cycle regulator and tumor suppressor. RB cellular functions are known to be regulated by a diversity of post-translational modifications such as phosphorylation and acetylation, raising the possibility that RB may also be methylated in cells. Here we demonstrate that RB can be methylated by SMYD2 at lysine 860, a highly conserved and novel site of modification. This methylation event occurs in vitro and in cells, and it is regulated during cell cycle progression, cellular differentiation, and in response to DNA damage. Furthermore, we show that RB monomethylation at lysine 860 provides a direct binding site for the methyl-binding domain of the transcriptional repressor L3MBTL1. These results support the idea that a code of post-translational modifications exists for RB and helps guide its functions in mammalian cells.

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http://dx.doi.org/10.1074/jbc.M110.137612DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2988378PMC
November 2010
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References

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Ying et al.
Cell Cycle 2006

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