3gdh

Structural highlights

Function

TGS1_HUMAN Catalyzes the 2 serial methylation steps for the conversion of the 7-monomethylguanosine (m(7)G) caps of snRNAs and snoRNAs to a 2,2,7-trimethylguanosine (m(2,2,7)G) cap structure. The enzyme is specific for guanine, and N7 methylation must precede N2 methylation. Hypermethylation of the m7G cap of U snRNAs leads to their concentration in nuclear foci, their colocalization with coilin and the formation of canonical Cajal bodies (CBs). Plays a role in transcriptional regulation.^{[1] [2] [3] [4]}

Evolutionary Conservation

Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf.

References

1. ↑ Zhu Y, Qi C, Cao WQ, Yeldandi AV, Rao MS, Reddy JK. Cloning and characterization of PIMT, a protein with a methyltransferase domain, which interacts with and enhances nuclear receptor coactivator PRIP function. Proc Natl Acad Sci U S A. 2001 Aug 28;98(18):10380-5. Epub 2001 Aug 21. PMID:11517327 doi:http://dx.doi.org/10.1073/pnas.181347498
2. ↑ Misra P, Qi C, Yu S, Shah SH, Cao WQ, Rao MS, Thimmapaya B, Zhu Y, Reddy JK. Interaction of PIMT with transcriptional coactivators CBP, p300, and PBP differential role in transcriptional regulation. J Biol Chem. 2002 May 31;277(22):20011-9. Epub 2002 Mar 23. PMID:11912212 doi:http://dx.doi.org/10.1074/jbc.M201739200
3. ↑ Lemm I, Girard C, Kuhn AN, Watkins NJ, Schneider M, Bordonne R, Luhrmann R. Ongoing U snRNP biogenesis is required for the integrity of Cajal bodies. Mol Biol Cell. 2006 Jul;17(7):3221-31. Epub 2006 May 10. PMID:16687569 doi:http://dx.doi.org/10.1091/mbc.E06-03-0247
4. ↑ Hausmann S, Zheng S, Costanzo M, Brost RL, Garcin D, Boone C, Shuman S, Schwer B. Genetic and biochemical analysis of yeast and human cap trimethylguanosine synthase: functional overlap of 2,2,7-trimethylguanosine caps, small nuclear ribonucleoprotein components, pre-mRNA splicing factors, and RNA decay pathways. J Biol Chem. 2008 Nov 14;283(46):31706-18. doi: 10.1074/jbc.M806127200. Epub 2008, Sep 5. PMID:18775984 doi:http://dx.doi.org/10.1074/jbc.M806127200