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O-Ribose Methyltransferases Involved in Mrna Cap Structure Formation

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O-Ribose Methyltransferases Involved in Mrna Cap Structure Formation ARTICLE Received 13 Aug 2013 | Accepted 22 Nov 2013 | Published 9 Jan 2014 DOI: 10.1038/ncomms4004 OPEN Structural analysis of human 20-O-ribose methyltransferases involved in mRNA cap structure formation Miroslaw Smietanski1,2, Maria Werner1, Elzbieta Purta1, Katarzyna H. Kaminska1, Janusz Stepinski3, Edward Darzynkiewicz3,4, Marcin Nowotny2 & Janusz M. Bujnicki1,5 The 50 cap of human messenger RNA contains 20-O-methylation of the first and often second transcribed nucleotide that is important for its processing, translation and stability. Human enzymes that methylate these nucleotides, termed CMTr1 and CMTr2, respectively, have recently been identified. However, the structures of these enzymes and their mechanisms of action remain unknown. In the present study, we solve the crystal structures of the active CMTr1 catalytic domain in complex with a methyl group donor and a capped oligo- ribonucleotide, thereby revealing the mechanism of specific recognition of capped RNA. This mechanism differs significantly from viral enzymes, thus providing a framework for their specific targeting. Based on the crystal structure of CMTr1, a comparative model of the CMTr2 catalytic domain is generated. This model, together with mutational analysis, leads to the identification of residues involved in RNA and methyl group donor binding. 1 Laboratory of Bioinformatics and Protein Engineering, International Institute of Molecular and Cell Biology in Warsaw, ul. ks. Trojdena 4, PL-02-109 Warsaw, Poland. 2 Laboratory of Protein Structure, International Institute of Molecular and Cell Biology in Warsaw, ul. ks. Trojdena 4, PL-02-109 Warsaw, Poland. 3 Division of Biophysics, Institute of Experimental Physics, Faculty of Physics, University of Warsaw, ul. Zwirki i Wigury 93, PL-02-089 Warsaw, Poland. 4 Centre of New Technologies, University of Warsaw, ul. Zwirki i Wigury 93, PL-02-089 Warsaw, Poland. 5 Laboratory of Bioinformatics, Institute of Molecular Biology and Biotechnology, Faculty of Biology, Adam Mickiewicz University, ul. Umultowska 89, PL-61-614 Poznan, Poland. Correspondence and requests for materials should be addressed to M.N. (email: [email protected]) or to J.M.B. (email: [email protected]). NATURE COMMUNICATIONS | 5:3004 | DOI: 10.1038/ncomms4004 | www.nature.com/naturecommunications 1 & 2014 Macmillan Publishers Limited. All rights reserved. ARTICLE NATURE COMMUNICATIONS | DOI: 10.1038/ncomms4004 essenger RNAs (mRNAs) of all eukaryotic organisms 2 19 85 133 170 550 755 790 835 and many viral RNAs possess a 50 cap structure that 7 7 GTase-like consists of an N -methylguanosine (m G) linked via an NLS G-patch RFM WW M (no active site) inverted 50–50 triphosphate bridge to the 50-terminal nucleoside of the transcript1. This cap0 structure is essential for the cell growth CMTr1 of Saccharomyces cerevisiae2 and survival of mammalian cells3. Cap0 is critical for mRNA interactions with many nuclear and α1 cytoplasmic proteins and plays multiple roles in gene expression, including the enhancement of RNA stability, splicing, nucleocytoplasmic transport and translation initiation4,5.In β higher eukaryotes, mRNA and small nuclear RNA (snRNA) 50 1 α10 α9 ends are further modified by methylation of the ribose on the first β9 and second transcribed nucleosides (that is, cap1 and cap2, respectively)6. In humans, cap0 and cap1 methylations are α8 present on all mRNA molecules, whereas approximately half of α6 the capped and polyadenylated RNA molecules contain cap2 α7 β 7 7 β8 methylation . The U1, U2, U4 and U5 snRNAs are methylated at β6 8 β5 the first two positions . Cap1 and cap2 methylations in U2 β2 snRNA are required for spliceosomal E complex formation and β3 9 α2 α11 SAM consequently for efficient pre-mRNA splicing . β4 Uncapped RNAs, such as nascent viral transcripts, may be m7G detected as ‘non-self’ by the host cell, triggering an antiviral 1 α α5 innate immune response through the production of interferons10. 4 Therefore, many viruses that replicate in the cytoplasm of 2 eukaryotes have evolved 20-O-methyltransferases (20-O-MTases) 3 to autonomously modify their mRNAs. Although the RNA cap α3 α12 structures that originate from human and viral enzymes are 4 identical, the structure and catalytic mechanisms of the virus- encoded enzymes involved in the synthesis of the RNA cap structure are different from those of host cells. As a consequence, Figure 1 | Crystal structure of the catalytic MTase domain of CMTr1. these pathogenic cap-forming enzymes are potential targets for (a) Domain composition of full-length CMTr1. The dashed lines indicate the antimicrobial drugs (as reviewed in ref. 11). Several potent region of the protein (CMTr1126–550) present in the crystal structure. The inhibitors of viral cap1 MTases were recently identified, but their domain boundaries are indicated with residue numbers. (b) Crystal specificity and lack of toxicity (for example, the absence of structure of CMTr1 in complex with capped oligoribonucleotide 12 126–550 interactions with human enzymes) remain to be established . (m7GpppGAUC; coloured yellow) and SAM (green). Helices are shown in To date, numerous high-resolution structures of viral RNA orange, b-strands are shown in blue and loops are shown in white. capping enzymes have been determined, but only a few of them represent complexes with RNA and shed light on specific cap recognition. This is partially because the availability of 50-capped RNA substrates with a defined and appropriate length has we created deletion variants of each protein. For CMTr1, one of remained an important bottleneck. A structure of vaccinia virus the variants (CMTr11–550) contained the catalytic Rossmann-fold cap1 MTase VP39 has been solved as a ternary complex with S- MTase (RFM) domain, G-patch and nuclear localization signal, 13 adenosyl-L-homocysteine (SAH) and a capped RNA . A number and the other variant (CMTr1550–835) contained the remaining of structures of cap1 MTases from flaviviruses were determined carboxy-terminal part that comprises the guanylyltransferase-like with various cap analogues, revealing the structure of the cap- and WW domains (Fig. 1a). CMTr2 was also divided into two binding pocket14,15. The development of compounds that inhibit parts: the amino-terminal part with the catalytic RFM domain viral cap1 MTases has been, however, greatly limited by the lack (CMTr21–430) and the C-terminal part with the non-catalytic of structural information about the corresponding human RFM domain (CMTr2430–770) (Fig. 2a). CMTr11–550 is able to enzymes that must not be inhibited by the virus-specific drugs. bind a cap0-RNA substrate and methylate it, and the C-terminal Genes that encode the human cap1 and cap2 MTases (that is, guanylyltransferase-like domain of CMTr1 is not essential but CMTr1 and CMTr2) have been only recently discovered16,17, contributes to the MTase activity of this protein (Fig. 3). The enabling detailed biochemical and structural characterization of single domains of CMTr2 do not bind the substrate and do not their products. exhibit any cap MTase activity alone or when mixed together as In the present study, we report crystal structures of an isolated, separately purified chains. Thus, CMTr2 requires both RFM functionally active CMTr1 catalytic domain in several forms, domains in a single polypeptide chain for substrate binding and including a complex with a capped oligoribonucleotide methylation. (m7GpppGAUC). Furthermore, a model of the CMTr2 catalytic domain bound to its target is presented. These structures reveal key differences in cap binding by human and viral enzymes, CMTr1 catalytic domain structure. To elucidate the mechanism providing a framework for the search for viral cap MTase-specific of cap recognition and methylation by CMTr1, we solved its inhibitors. crystal structure in complex with ligands. We expressed several deletion mutants in Escherichia coli and finally identified a stable CMTr1 variant that comprised a catalytic domain (residues Results 126–550; described in detail in the Supplementary Methods). The Deletion analysis of cap MTases. To understand the contribu- enzymatic activity of CMTr1126–550 was confirmed in vitro tion of individual domains to the function of CMTr1 and CMTr2, (Supplementary Fig. S1); consequently, this protein variant was 2 NATURE COMMUNICATIONS | 5:3004 | DOI: 10.1038/ncomms4004 | www.nature.com/naturecommunications & 2014 Macmillan Publishers Limited. All rights reserved. NATURE COMMUNICATIONS | DOI: 10.1038/ncomms4004 ARTICLE ac 15 423 770 120 120 RFM MTase-like (no active site) 100 100 CMTr2 80 80 60 60 40 40 MTase activity (%) MTase α10 20 activity (%) MTase 20 0 0 α9 N+C α7 CMTr1 1–550 CMTr2 550–835126–550 α8 1–430 (N) 430–770 (C) α1 β6 β7 β5 β4 bd β1 120 120 α2 α 11 SAM β H142 2 100 E145 100 K74 β3 7 80 80 S78 m G 2 L77 1 α5 α6 3 60 60 K307 W85 40 40 T89 4 Q113 α3 H86 α12 20 20 Substrate binding (%) Substrate α4 binding (%) Substrate 0 0 N+C CMTr1 1–550 CMTr2 550–835 1–430 (N) 430–770 (C) Figure 2 | Homology model of CMTr21–423. (a) Domain composition of CMTr2. The dashed lines indicate a part of the protein that was modelled Figure 3 | Biochemical characterization of CMTr1 and CMTr2 and their based on the CMTr1126–550 crystal structure. The domain boundaries are fragments. The analysis was performed for full-length proteins and deletion indicated with residue numbers. (b) Homology model of the catalytic variants of CMTr1 (a,b) and CMTr2 (c,d). The proteins were overexpressed domain of CMTr2 in complex with capped oligoribonucleotide in and isolated from HEK 293 cells (white bars) or E. coli (grey bar). Protein (m7GpppGGAA) and SAM. m7GpppGGAA and SAM are coloured yellow variant CMTr1 126–550 was expressed from crystallization construct. and green, respectively. Helices are shown in orange, b-strands are shown (a,c) MTase activity. In vitro transcribed RNA-GG molecules with a in blue and loops are shown in white.
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