Structure and function of flavivirus NS5 methyltransferase

Yangsheng Zhou, Debashish Ray, Yiwei Zhao, Hongping Dong, Suping Ren, Zhong Li, Yi Guo, Kristen A. Bernard, Pei-Yong Shi, Hongmin Li

Research output: Contribution to journalArticle

213 Citations (Scopus)

Abstract

The plus-strand RNA genome of flavivirus contains a 5′ terminal cap 1 structure (m7GpppAmG). The flaviviruses encode one methyltransferase, located at the N-terminal portion of the NS5 protein, to catalyze both guanine N-7 and ribose 2′-OH methylations during viral cap formation. Representative flavivirus methyltransferases from dengue, yellow fever, and West Nile virus (WNV) sequentially generate GpppA → m 7GpppA → m7GpppAm. The 2′-O methylation can be uncoupled from the N-7 methylation, since m7GpppA-RNA can be readily methylated to m7GpppAm-RNA. Despite exhibiting two distinct methylation activities, the crystal structure of WNV methyltransferase at 2.8 A resolution showed a single binding site for S-adenosyl-L-methionine (SAM), the methyl donor. Therefore, substrate GpppA-RNA should be repositioned to accept the N-7 and 2′-O methyl groups from SAM during the sequential reactions. Electrostatic analysis of the WNV methyltraasferase structure showed that, adjacent to the SAM-binding pocket, is a highly positively charged surface that could serve as an RNA binding site during cap methylations. Biochemical and mutagenesis analyses show that the N-7 and 2′-O cap methylations require distinct buffer conditions and different side chains within the K 61-D146-K182-E218 motif, suggesting that the two reactions use different mechanisms. In the context of complete virus, defects in both methylations are lethal to WNV; however, viruses defective solely in 27′-O methylation are attenuated and can protect mice from later wild-type WNV challenge. The results demonstrate that the N-7 methylation activity is essential for the WNV life cycle and, thus, methyltransferase represents a novel target for flavivirus therapy.

Original languageEnglish (US)
Pages (from-to)3891-3903
Number of pages13
JournalJournal of Virology
Volume81
Issue number8
DOIs
StatePublished - Apr 2007
Externally publishedYes

Fingerprint

Flavivirus
methyltransferases
Methyltransferases
methylation
Methylation
West Nile virus
S-Adenosylmethionine
S-adenosylmethionine
RNA
binding sites
Yellow fever virus
Binding Sites
viral morphology
Flaviviridae
Defective Viruses
Yellow Fever
Viral Structures
viruses
Ribose
dengue

ASJC Scopus subject areas

  • Immunology

Cite this

Zhou, Y., Ray, D., Zhao, Y., Dong, H., Ren, S., Li, Z., ... Li, H. (2007). Structure and function of flavivirus NS5 methyltransferase. Journal of Virology, 81(8), 3891-3903. https://doi.org/10.1128/JVI.02704-06

Structure and function of flavivirus NS5 methyltransferase. / Zhou, Yangsheng; Ray, Debashish; Zhao, Yiwei; Dong, Hongping; Ren, Suping; Li, Zhong; Guo, Yi; Bernard, Kristen A.; Shi, Pei-Yong; Li, Hongmin.

In: Journal of Virology, Vol. 81, No. 8, 04.2007, p. 3891-3903.

Research output: Contribution to journalArticle

Zhou, Y, Ray, D, Zhao, Y, Dong, H, Ren, S, Li, Z, Guo, Y, Bernard, KA, Shi, P-Y & Li, H 2007, 'Structure and function of flavivirus NS5 methyltransferase', Journal of Virology, vol. 81, no. 8, pp. 3891-3903. https://doi.org/10.1128/JVI.02704-06
Zhou Y, Ray D, Zhao Y, Dong H, Ren S, Li Z et al. Structure and function of flavivirus NS5 methyltransferase. Journal of Virology. 2007 Apr;81(8):3891-3903. https://doi.org/10.1128/JVI.02704-06
Zhou, Yangsheng ; Ray, Debashish ; Zhao, Yiwei ; Dong, Hongping ; Ren, Suping ; Li, Zhong ; Guo, Yi ; Bernard, Kristen A. ; Shi, Pei-Yong ; Li, Hongmin. / Structure and function of flavivirus NS5 methyltransferase. In: Journal of Virology. 2007 ; Vol. 81, No. 8. pp. 3891-3903.
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abstract = "The plus-strand RNA genome of flavivirus contains a 5′ terminal cap 1 structure (m7GpppAmG). The flaviviruses encode one methyltransferase, located at the N-terminal portion of the NS5 protein, to catalyze both guanine N-7 and ribose 2′-OH methylations during viral cap formation. Representative flavivirus methyltransferases from dengue, yellow fever, and West Nile virus (WNV) sequentially generate GpppA → m 7GpppA → m7GpppAm. The 2′-O methylation can be uncoupled from the N-7 methylation, since m7GpppA-RNA can be readily methylated to m7GpppAm-RNA. Despite exhibiting two distinct methylation activities, the crystal structure of WNV methyltransferase at 2.8 A resolution showed a single binding site for S-adenosyl-L-methionine (SAM), the methyl donor. Therefore, substrate GpppA-RNA should be repositioned to accept the N-7 and 2′-O methyl groups from SAM during the sequential reactions. Electrostatic analysis of the WNV methyltraasferase structure showed that, adjacent to the SAM-binding pocket, is a highly positively charged surface that could serve as an RNA binding site during cap methylations. Biochemical and mutagenesis analyses show that the N-7 and 2′-O cap methylations require distinct buffer conditions and different side chains within the K 61-D146-K182-E218 motif, suggesting that the two reactions use different mechanisms. In the context of complete virus, defects in both methylations are lethal to WNV; however, viruses defective solely in 27′-O methylation are attenuated and can protect mice from later wild-type WNV challenge. The results demonstrate that the N-7 methylation activity is essential for the WNV life cycle and, thus, methyltransferase represents a novel target for flavivirus therapy.",
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