6trq

Structural highlights

Function

DCPS_YEAST Decapping scavenger enzyme that catalyzes the cleavage of a residual cap structure following the degradation of mRNAs by the 3'->5' exosome-mediated mRNA decay pathway. Hydrolyzes cap analog structures like 7-methylguanosine nucleoside triphosphate (m7GpppG) and tri-methyl guanosine nucleoside triphosphate (m3(2,2,7)GpppG) with up to 10 nucleotide substrates (small capped oligoribonucleotides) and specifically releases 5'-phosphorylated RNA fragments and 7-methylguanosine monophosphate (m7GMP) or tri-methyl guanosine nucleoside monophosphate (m3(2,2,7)GMP), respectively. Does not hydrolyze unmethylated cap analog (GpppG) and shows no decapping activity on intact m7GpppG-capped mRNA molecules longer than 25 nucleotides. Does not hydrolyze 7-methylguanosine diphosphate (m7GDP) and tri-methylguanosine diphosphate (m3(2,2,7)GDP) to (m(7)GMP) and m3(2,2,7)GMP, respectively (PubMed:22985415). May also play a role in the 5'->3 mRNA decay pathway; m7GDP, the downstream product released by the 5'->3' mRNA mediated decapping activity, may be also converted by DCS1 to m7GMP (PubMed:14523240). Binds to m7GpppG and strongly to m7GDP. May also regulates the 5'->3' exoribonucleolytic mRNA decay pathway in a cap-independent manner. Negatively regulates trehalase activity.^{[1] [2] [3] [4] [5] [6] [7]}

References

1. ↑ Liu H, Rodgers ND, Jiao X, Kiledjian M. The scavenger mRNA decapping enzyme DcpS is a member of the HIT family of pyrophosphatases. EMBO J. 2002 Sep 2;21(17):4699-708. PMID:12198172
2. ↑ van Dijk E, Le Hir H, Seraphin B. DcpS can act in the 5'-3' mRNA decay pathway in addition to the 3'-5' pathway. Proc Natl Acad Sci U S A. 2003 Oct 14;100(21):12081-6. Epub 2003 Oct 1. PMID:14523240 doi:http://dx.doi.org/10.1073/pnas.1635192100
3. ↑ Malys N, Carroll K, Miyan J, Tollervey D, McCarthy JE. The 'scavenger' m7GpppX pyrophosphatase activity of Dcs1 modulates nutrient-induced responses in yeast. Nucleic Acids Res. 2004 Jul 7;32(12):3590-600. Print 2004. PMID:15240832 doi:http://dx.doi.org/10.1093/nar/gkh687
4. ↑ Liu SW, Jiao X, Liu H, Gu M, Lima CD, Kiledjian M. Functional analysis of mRNA scavenger decapping enzymes. RNA. 2004 Sep;10(9):1412-22. Epub 2004 Jul 23. PMID:15273322 doi:http://dx.doi.org/10.1261/rna.7660804
5. ↑ Liu H, Kiledjian M. Scavenger decapping activity facilitates 5' to 3' mRNA decay. Mol Cell Biol. 2005 Nov;25(22):9764-72. PMID:16260594 doi:http://dx.doi.org/10.1128/MCB.25.22.9764-9772.2005
6. ↑ Malys N, McCarthy JE. Dcs2, a novel stress-induced modulator of m7GpppX pyrophosphatase activity that locates to P bodies. J Mol Biol. 2006 Oct 20;363(2):370-82. Epub 2006 Aug 11. PMID:16963086 doi:http://dx.doi.org/10.1016/j.jmb.2006.08.015
7. ↑ Wypijewska A, Bojarska E, Lukaszewicz M, Stepinski J, Jemielity J, Davis RE, Darzynkiewicz E. 7-methylguanosine diphosphate (m(7)GDP) is not hydrolyzed but strongly bound by decapping scavenger (DcpS) enzymes and potently inhibits their activity. Biochemistry. 2012 Oct 9;51(40):8003-13. doi: 10.1021/bi300781g. Epub 2012 Sep, 25. PMID:22985415 doi:http://dx.doi.org/10.1021/bi300781g