DOI: 10.1128/jvi.73.12.9934-9943.1999. Multimers Formed by the Rotavirus Nonstructural Protein NSP2 Bind to RNA and Have Nucleoside Triphosphatase Activity

Multimers Formed by the Rotavirus Nonstructural Protein NSP2 Bind to RNA and Have Nucleoside Triphosphatase Activity

10.1128/jvi.73.12.9934-9943.1999

Crossref journal-article

American Society for Microbiology

Journal of Virology (235)

Abstract

ABSTRACT The nonstructural protein NSP2 is a component of rotavirus replication intermediates and accumulates in cytoplasmic inclusions (viroplasms), sites of genome RNA replication and the assembly of subviral particles. To better understand the structure and function of the protein, C-terminally His-tagged NSP2 was expressed in bacteria and purified to homogeneity. In its purified form, the protein did not exist as a monomer but rather was present as an 8S-10S homomultimer consisting of 6 ± 2 subunits of recombinant NSP2 (rNSP2). As shown by gel mobility shift assays, the rNSP2 multimers bound to RNA in discrete cooperative steps to form higher-order RNA-protein complexes. The RNA-binding activity of the rNSP2 multimers was determined to be nonspecific and to have a strong preference for single-stranded RNA over double-stranded RNA, for which it displayed little affinity. Enzymatic analysis revealed that rNSP2 possessed an associated nucleoside triphosphatase (NTPase) activity in vitro, which in the presence of Mg 2+ catalyzed the hydrolysis of each of the four NTPs to NDPs with equal efficiency. Evidence indicating that the hydrolysis of NTP resulted in the covalent linkage of the γ-phosphate to rNSP2 was obtained. Additional experiments showed that NSP2 expressed transiently in MA014 cells is phosphorylated. We propose that NSP2 functions as a molecular motor, catalyzing the packaging of viral mRNA into core-like replication intermediates through the energy derived from its NTPase activity.

Bibliography

Taraporewala, Z., Chen, D., & Patton, J. T. (1999). Multimers Formed by the Rotavirus Nonstructural Protein NSP2 Bind to RNA and Have Nucleoside Triphosphatase Activity. Journal of Virology, 73(12), 9934â9943.

Authors 3

Zenobia Taraporewala (first)
Dayue Chen (additional)
John T. Patton (additional)

References 42 Referenced 101

Dates

Type	When
Created	5 years, 7 months ago (Dec. 31, 2019, 1:21 p.m.)
Deposited	3 years, 5 months ago (March 4, 2022, 10:45 p.m.)
Indexed	1 month ago (July 25, 2025, 6:46 a.m.)
Issued	25 years, 8 months ago (Dec. 1, 1999)
Published	25 years, 8 months ago (Dec. 1, 1999)
Published Print	25 years, 8 months ago (Dec. 1, 1999)

Funders 0

None

BibTeX

@article{Taraporewala_1999, title={Multimers Formed by the Rotavirus Nonstructural Protein NSP2 Bind to RNA and Have Nucleoside Triphosphatase Activity}, volume={73}, ISSN={1098-5514}, url={http://dx.doi.org/10.1128/jvi.73.12.9934-9943.1999}, DOI={10.1128/jvi.73.12.9934-9943.1999}, number={12}, journal={Journal of Virology}, publisher={American Society for Microbiology}, author={Taraporewala, Zenobia and Chen, Dayue and Patton, John T.}, year={1999}, month=dec, pages={9934–9943} }

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