| Structural highlights
3bla is a 2 chain structure with sequence from Human. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
| | Ligands: | |
| Related: | 1st0, 1st4, 3bl7, 3bl9 |
| Gene: | DCPS, DCS1, HINT5 (HUMAN) |
| Resources: | FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT |
Function
[DCPS_HUMAN] 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) with up to 10 nucleotide substrates (small capped oligoribonucleotides) and specifically releases 5'-phosphorylated RNA fragments and 7-methylguanosine monophosphate (m7GMP). Cleaves cap analog structures like tri-methyl guanosine nucleoside triphosphate (m3(2,2,7)GpppG) with very poor efficiency. 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) to m7GMP (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 DCPS to m7GMP (PubMed:14523240). Binds to m7GpppG and strongly to m7GDP. Plays a role in first intron splicing of pre-mRNAs. Inhibits activation-induced cell death.[1] [2] [3] [4] [5] [6] [7] [8] [9] [10]
Evolutionary Conservation
Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf.
Publication Abstract from PubMed
Spinal muscular atrophy (SMA) is caused by deletion or mutation of both copies of the SMN1 gene, which produces an essential protein known as SMN. The severity of SMA is modified by variable copy number of a second gene, SMN2, which produces an mRNA that is incorrectly spliced with deletion of the last exon. We described previously the discovery of potent C5-substituted quinazolines that increase SMN2 gene expression by 2-fold. Discovery of potent SMN2 promoter inducers relied on a cellular assay without knowledge of the molecular target. Using protein microarray scanning with a radiolabeled C5-substituted quinazoline probe, we identified the scavenger decapping enzyme, DcpS, as a potential binder. We show that the C5-substituted quinazolines potently inhibit DcpS decapping activity and that the potency of inhibition correlates with potency for SMN2 promoter induction. Binding of C5-substituted quinazolines to DcpS holds the enzyme in an open, catalytically incompetent conformation. DcpS is a nuclear shuttling protein that binds and hydrolyzes the m (7)GpppN mRNA cap structure and a modulator of RNA metabolism. Therefore DcpS represents a novel therapeutic target for modulating gene expression by a small molecule.
DcpS as a Therapeutic Target for Spinal Muscular Atrophy.,Singh J, Salcius M, Liu SW, Staker BL, Mishra R, Thurmond J, Michaud G, Mattoon DR, Printen J, Christensen J, Bjornsson JM, Pollok BA, Kiledjian M, Stewart L, Jarecki J, Gurney ME ACS Chem Biol. 2008 Oct 8. PMID:18839960[11]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
References
- ↑ 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
- ↑ Kwasnicka DA, Krakowiak A, Thacker C, Brenner C, Vincent SR. Coordinate expression of NADPH-dependent flavin reductase, Fre-1, and Hint-related 7meGMP-directed hydrolase, DCS-1. J Biol Chem. 2003 Oct 3;278(40):39051-8. Epub 2003 Jul 18. PMID:12871939 doi:http://dx.doi.org/10.1074/jbc.M306355200
- ↑ Wang Z, Kiledjian M. Functional link between the mammalian exosome and mRNA decapping. Cell. 2001 Dec 14;107(6):751-62. PMID:11747811
- ↑ 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
- ↑ 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
- ↑ Cohen LS, Mikhli C, Friedman C, Jankowska-Anyszka M, Stepinski J, Darzynkiewicz E, Davis RE. Nematode m7GpppG and m3(2,2,7)GpppG decapping: activities in Ascaris embryos and characterization of C. elegans scavenger DcpS. RNA. 2004 Oct;10(10):1609-24. PMID:15383679 doi:http://dx.doi.org/10.1261/rna.7690504
- ↑ Kwasnicka-Crawford DA, Vincent SR. Role of a novel dual flavin reductase (NR1) and an associated histidine triad protein (DCS-1) in menadione-induced cytotoxicity. Biochem Biophys Res Commun. 2005 Oct 21;336(2):565-71. PMID:16140270 doi:http://dx.doi.org/S0006-291X(05)01784-5
- ↑ Shen V, Liu H, Liu SW, Jiao X, Kiledjian M. DcpS scavenger decapping enzyme can modulate pre-mRNA splicing. RNA. 2008 Jun;14(6):1132-42. doi: 10.1261/rna.1008208. Epub 2008 Apr 21. PMID:18426921 doi:http://dx.doi.org/10.1261/rna.1008208
- ↑ 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
- ↑ Chen N, Walsh MA, Liu Y, Parker R, Song H. Crystal structures of human DcpS in ligand-free and m7GDP-bound forms suggest a dynamic mechanism for scavenger mRNA decapping. J Mol Biol. 2005 Apr 8;347(4):707-18. PMID:15769464 doi:10.1016/j.jmb.2005.01.062
- ↑ Singh J, Salcius M, Liu SW, Staker BL, Mishra R, Thurmond J, Michaud G, Mattoon DR, Printen J, Christensen J, Bjornsson JM, Pollok BA, Kiledjian M, Stewart L, Jarecki J, Gurney ME. DcpS as a Therapeutic Target for Spinal Muscular Atrophy. ACS Chem Biol. 2008 Oct 8. PMID:18839960 doi:10.1021/cb800120t
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