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Unexpected Link Between Coronavirus Replication And Protein Secretion In Infected Cells

Date:
June 19, 2008
Source:
Public Library of Science
Summary:
Coronavirus replication is critically linked to two factors within the early secretory pathway, according to new findings in PLoS Pathogens. The SARS virus is within the coronavirus group.

Coronavirus replication is critically linked to two factors within the early secretory pathway, according to new findings by a team of Dutch researchers.

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Coronaviruses, a group including the well-known SARS virus, are the causative agents of many respiratory and enteric infections in humans and animals. As with all viruses, virtually every step of their infection cycle depends on host cellular factors. As the first, most crucial step after their penetration into cells, coronaviruses assemble huge RNA replication "factory" complexes in association with characteristic, newly induced double membrane vesicles. The cellular pathways hijacked by these plus-strand RNA viruses to create these "factories" have thus far not been elucidated.

The researchers, led by Cornelis A. M. de Haan, showed that RNA replication of mouse hepatitis coronavirus (MHV) was inhibited by a drug -- brefeldin A -- that disrupts the central station in the cell's secretory pathway, the Golgi complex. Consistently, depletion of both the cellular target of brefeldin A, a factor called GBF1, and its downstream target, ARF1, was also shown to negatively affect coronavirus infection.

The researchers conclude that "an intimate association exists between the early secretory pathway and MHV replication." They speculate that, while GBF1 and ARF1 are not involved in the formation of the viral replication structures, they probably play a key role in their maturation or functioning. As this work was limited to the mouse hepatitis coronavirus, an interesting next step would be to study the importance of GBF1 and ARF1 in the replication of other coronaviruses.


Story Source:

The above story is based on materials provided by Public Library of Science. Note: Materials may be edited for content and length.


Journal Reference:

  1. Verheije et al. Mouse Hepatitis Coronavirus RNA Replication Depends on GBF1-Mediated ARF1 Activation. PLoS Pathogens, 2008; 4 (6): e1000088 DOI: 10.1371/journal.ppat.1000088

Cite This Page:

Public Library of Science. "Unexpected Link Between Coronavirus Replication And Protein Secretion In Infected Cells." ScienceDaily. ScienceDaily, 19 June 2008. <www.sciencedaily.com/releases/2008/06/080613101123.htm>.
Public Library of Science. (2008, June 19). Unexpected Link Between Coronavirus Replication And Protein Secretion In Infected Cells. ScienceDaily. Retrieved December 18, 2014 from www.sciencedaily.com/releases/2008/06/080613101123.htm
Public Library of Science. "Unexpected Link Between Coronavirus Replication And Protein Secretion In Infected Cells." ScienceDaily. www.sciencedaily.com/releases/2008/06/080613101123.htm (accessed December 18, 2014).

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