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Open Access Research article

Role of the small GTPase Rab27a during Herpes simplex virus infection of oligodendrocytic cells

Raquel Bello-Morales1, Antonio Jesús Crespillo1, Alberto Fraile-Ramos2, Enrique Tabarés3, Antonio Alcina4 and José Antonio López-Guerrero1*

  • * Corresponding author: José Antonio López-Guerrero jal@cbm.uam.es

Author Affiliations

1 Centro de Biología Molecular Severo Ochoa, CSIC-UAM, Nicolás Cabrera 5, Cantoblanco, 28049, Madrid, Spain

2 Universidad Complutense de Madrid, Facultad de Medicina, Ciudad Universitaria, 28040, Madrid, Spain

3 Universidad Autónoma de Madrid, Facultad de Medicina, Arzobispo Morcillo 4, 28029, Madrid, Spain

4 Instituto de Parasitología y Biomedicina López Neyra, CSIC, Parque Tecnológico de Ciencias de la Salud, Avenida del Conocimiento s/n, 18100, Armilla, Granada, Spain

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BMC Microbiology 2012, 12:265  doi:10.1186/1471-2180-12-265

Published: 19 November 2012

Abstract

Background

The morphogenesis of herpes simplex virus type 1 (HSV-1) comprises several events, of which some are not completely understood. It has been shown that HSV-1 glycoproteins accumulate in the trans-Golgi network (TGN) and in TGN-derived vesicles. It is also accepted that HSV-1 acquires its final morphology through a secondary envelopment by budding into TGN-derived vesicles coated with viral glycoproteins and tegument proteins. Nevertheless, several aspects of this process remain elusive. The small GTPase Rab27a has been implicated in regulated exocytosis, and it seems to play a key role in certain membrane trafficking events. Rab27a also seems to be required for human cytomegalovirus assembly. However, despite the involvement of various Rab GTPases in HSV-1 envelopment, there is, to date, no data reported on the role of Rab27a in HSV-1 infection.

Results

Herein, we show that Rab27a colocalized with GHSV-UL46, a tegument-tagged green fluorescent protein-HSV-1, in the TGN. In fact, this small GTPase colocalized with viral glycoproteins gH and gD in that compartment. Functional analysis through Rab27a depletion showed a significant decrease in the number of infected cells and viral production in Rab27a-silenced cells.

Conclusions

Altogether, our results indicate that Rab27a plays an important role in HSV-1 infection of oligodendrocytic cells.

Keywords:
HSV-1; Oligodendrocytes; Rab27a; Viral egress; Morphogenesis; Tegument