Abstract
RIZ1 (PRDM2) and PRDI-BF1 (PRDM1) are involved in B cell differentiation and the development of B cell lymphomas. These proteins are expressed in two forms that differ by the presence or absence of a PR domain. The protein product that retains the PR domain is anti-tumorigenic while the product that lacks the PR domain is oncogenic and over-expressed in tumor cells. The conserved PR domain is homologous to the SET domain from a family of histone methyltransferases. RIZ1 is also a histone methyltransferase and methylates lysine 9 in histone H3. This activity has been mapped to the PR domain. In the present study, deuterium exchange mass spectrometry was used to define the structural boundaries of the RIZ1 PR domain and to map sites of missense mutations that occur in human cancers and reduce methyltransferase activity. Flexible segments were selectively deleted to produce protein products that crystallize for structural studies. Segments at the carboxyl terminus of the PR domain that are involved in methylation of H3 were shown to be flexible, similar to SET domains, suggesting that the PR and SET methyltransferases may belong to an emerging class of proteins that contain mobile functional regions.
| Original language | English |
|---|---|
| Pages (from-to) | 925-934 |
| Number of pages | 10 |
| Journal | Biochemical and Biophysical Research Communications |
| Volume | 333 |
| Issue number | 3 |
| DOIs | |
| State | Published - Aug 5 2005 |
Funding
This work was supported by Grants CA105347 and CA099835 from the National Cancer Institute, DAMD17-99-1-9093 and DAMD17-02-1-0312 from the USAMRDC, and 4JB-0001 from the California Breast Cancer Research Program. The DXMS work (V.L.W.) also received grant support as technology transfer grants S97-90, S99-44 from the University of California BioStar program and L98-30 from the University of California Life Sciences program with matching partner ExSAR Corporation, Monmouth Junction, NJ. U.S. Patent #5,658,739, U.S. Patent #6,291,189, U.S. Patent #6,331,400, and U.S. Patent #6,599,707 are held by V.L.W. V.L.W. has an equity interest in ExSAR Corporation. The authors are grateful to Lisa O’Brien for preparing the manuscript for publication.
| Funder number |
|---|
| DAMD17-02-1-0312, R21CA099835, DAMD17-99-1-9093 |
| 4JB-0001, S99-44, S97-90 |
Keywords
- Deuterium exchange
- Histone methyltransferases
- Mass spectrometry
- PR domains
- SET domains