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Analysis of flavivirus NS5 methyltransferase cap binding.

Geiss BJ, Thompson AA, Andrews AJ, Sons RL, Gari HH, Keenan SM, Peersen OB
J Mol Biol 385 1643-54 (2009)
Related entries: 3eva, 3evb, 3evc, 3evd, 3eve, 3evf

Cited: 65 times
EuropePMC logo PMID: 19101564

Abstract

The flavivirus 2'-O-nucleoside N-terminal RNA methyltransferase (MTase) enzyme is responsible for methylating the viral RNA cap structure. To increase our understanding of the mechanism of viral RNA cap binding we performed a detailed structural and biochemical characterization of the guanosine cap-binding pocket of the dengue (DEN) and yellow fever (YF) virus MTase enzymes. We solved an improved 2.1 A resolution crystal structure of DEN2 Mtase, new 1.5 A resolution crystal structures of the YF virus MTase domain in apo form, and a new 1.45 A structure in complex with guanosine triphosphate and RNA cap analog. Our structures clarify the previously reported DEN MTase structure, suggest novel protein-cap interactions, and provide a detailed view of guanine specificity. Furthermore, the structures of the DEN and YF proteins are essentially identical, indicating a large degree of structural conservation amongst the flavivirus MTases. Guanosine triphosphate analog competition assays and mutagenesis analysis, performed to analyze the biochemical characteristics of cap binding, determined that the major interaction points are (i) guanine ring via pi-pi stacking with Phe24, N1 hydrogen interaction with the Leu19 backbone carbonyl via a water bridge, and C2 amine interaction with Leu16 and Leu19 backbone carbonyls; (ii) ribose 2' hydroxyl interaction with Lys13 and Asn17; and (iii) alpha-phosphate interactions with Lys28 and Ser215. Based on our mutational and analog studies, the guanine ring and alpha-phosphate interactions provide most of the energy for cap binding, while the combination of the water bridge between the guanine N1 and Leu19 carbonyl and the hydrogen bonds between the C2 amine and Leu16/Leu19 carbonyl groups provide for specific guanine recognition. A detailed model of how the flavivirus MTase protein binds RNA cap structures is presented.

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Articles - 3evg mentioned but not cited (5)

  1. Analysis of flavivirus NS5 methyltransferase cap binding. Geiss BJ, Thompson AA, Andrews AJ, Sons RL, Gari HH, Keenan SM, Peersen OB. J Mol Biol 385 1643-1654 (2009)
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  4. GeneSV - an Approach to Help Characterize Possible Variations in Genomic and Protein Sequences. Zemla A, Kostova T, Gorchakov R, Volkova E, Beasley DW, Cardosa J, Weaver SC, Vasilakis N, Naraghi-Arani P. Bioinform Biol Insights 8 1-16 (2014)
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  9. Enzymatic Assays to Explore Viral mRNA Capping Machinery. Kasprzyk R, Jemielity J. Chembiochem 22 3236-3253 (2021)

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