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Journal of Virology, September 2007, p. 9519-9524, Vol. 81, No. 17
0022-538X/07/$08.00+0     doi:10.1128/JVI.00526-07
Copyright © 2007, American Society for Microbiology. All Rights Reserved.

The 24-Angstrom Structure of Respiratory Syncytial Virus Nucleocapsid Protein-RNA Decameric Rings{triangledown} ,{dagger}

Kirsty MacLellan,{ddagger} Colin Loney, R. Paul Yeo,§ and David Bhella*

Medical Research Council Virology Unit, Institute of Virology, Church Street, Glasgow G11 5JR, United Kingdom

Received 13 March 2007/ Accepted 5 June 2007

Respiratory syncytial virus (RSV), a nonsegmented, negative-sense RNA-containing virus, is a common cause of lower respiratory tract disease. Expression of RSV nucleocapsid protein (N) in insect cells using the baculovirus expression system leads to the formation of N-RNA complexes that are morphologically indistinguishable from viral nucleocapsids. When imaged in an electron microscope, three distinct types of structures were observed: tightly wound short-pitch helices, highly extended helices, and rings. Negative stain images of N-RNA rings were used to calculate a three-dimensional reconstruction at 24 Å resolution, revealing features similar to those observed in nucleocapsids from other viruses of the order Mononegavirales. The reconstructed N-RNA rings comprise 10 N monomers and have an external radius of 83 Å and an internal radius of 40 Å. Comparison of this structure with crystallographic data from rabies virus and vesicular stomatitis virus N-RNA rings reveals striking morphological similarities.

* Corresponding author. Mailing address: MRC Virology Unit, Church Street, Glasgow G11 5JR, United Kingdom. Phone: 1413303685. Fax: 1413372236. E-mail: d.bhella{at}mrcvu.gla.ac.uk

{triangledown} Published ahead of print on 13 June 2007.

{dagger} Supplemental material for this article may be found at http://jvi.asm.org/.

{ddagger} Present address: Laboratoire d'Analyse Ultrastructurale, Université de Lausanne, Lausanne 1015, Switzerland.

§ Present address: Centre for Infectious Diseases, University of Durham, Queen's Campus, Wolfson Research Institute, University Boulevard, Stockton-on-Tees TS17 6BH, United Kingdom.

Journal of Virology, September 2007, p. 9519-9524, Vol. 81, No. 17
0022-538X/07/$08.00+0     doi:10.1128/JVI.00526-07
Copyright © 2007, American Society for Microbiology. All Rights Reserved.



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