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Journal of Virology, December 1999, p. 9934-9943, Vol. 73, No. 12
0022-538X/99/$04.00+0

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

Zenobia Taraporewala, Dayue Chen, and John T. Patton*

Laboratory of Infectious Diseases, National Institutes of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, Maryland 20892

Received 5 May 1999/Accepted 27 August 1999

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 Mg2+ 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 gamma -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.

* Corresponding author. Mailing address: Laboratory of Infectious Diseases, National Institutes of Allergy and Infectious Diseases, National Institutes of Health, 7 Center Dr., MSC 0720, Room 117, Bethesda, MD 20892. Phone: (301) 496-3372. Fax: (301) 496-8312. E-mail: jpatton{at}atlas.niaid.nih.gov.

Journal of Virology, December 1999, p. 9934-9943, Vol. 73, No. 12
0022-538X/99/$04.00+0


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