Analysis of the medium (M) segment sequence of Guaroa virus and its comparison to other orthobunyaviruses

Author:

Briese Thomas1,Rambaut Andrew2,Lipkin W. Ian1

Affiliation:

1. Jerome L. and Dawn Greene Infectious Disease Laboratory, Mailman School of Public Health, Columbia University, New York, NY 10032, USA

2. Department of Zoology, University of Oxford, South Parks Road, Oxford OX1 3PS, UK

Abstract

Guaroa virus(GROV), a segmented virus in the genusOrthobunyavirus, has been linked to the Bunyamwera serogroup (BUN) through cross-reactivity in complement fixation assays of S segment-encoded nucleocapsid protein determinants, and also to the California serogroup (CAL) through cross-reactivity in neutralization assays of M segment-encoded glycoprotein determinants. Phylogenetic analysis of the S-segment sequence supported a closer relationship to the BUN serogroup for this segment and it was hypothesized that the serological reaction may indicate genome-segment reassortment. Here, cloning and sequencing of the GROV M segment are reported. Sequence analysis indicates an organization similar to that of other orthobunyaviruses, with genes in the order Gn–nsm–gc, and mature proteins generated by protease cleavage at one, and by signalase at possibly three, sites. A potential role of motifs that are more similar to CAL than to BUN virus sequences with respect to the serological reaction is discussed. No discernable evidence for reassortment was identified.

Publisher

Microbiology Society

Subject

Virology

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