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Journal of Virology, October 2004, p. 10793-10802, Vol. 78, No. 19
0022-538X/04/$08.00+0     DOI: 10.1128/JVI.78.19.10793-10802.2004
Copyright © 2004, American Society for Microbiology. All Rights Reserved.

Mapping the Golgi Targeting and Retention Signal of Bunyamwera Virus Glycoproteins

Xiaohong Shi, David F. Lappin,{dagger} and Richard M. Elliott*

Division of Virology, Institute of Biomedical and Life Sciences, University of Glasgow, Glasgow, Scotland, United Kingdom

Received 16 February 2004/ Accepted 24 May 2004

The membrane glycoproteins (Gn and Gc) of Bunyamwera virus (BUN; family Bunyaviridae) accumulate in the Golgi complex, where virion maturation occurs. The Golgi targeting and retention signal has previously been shown to reside within the Gn protein. A series of truncated Gn and glycoprotein precursor cDNAs were constructed by progressively deleting the coding region of the transmembrane domain (TMD) and the cytoplasmic tail. We also constructed chimeric proteins of BUN Gc, enhanced green fluorescent protein (EGFP), and human respiratory syncytial virus (HRSV) fusion (F) protein that contain the Gn TMD with various lengths of its adjacent cytoplasmic tails. The subcellular localization of mutated BUN glycoproteins and chimeric proteins was investigated by double-staining immunofluorescence with antibodies against BUN glycoproteins or the HRSV F protein and with antibodies specific for the Golgi complex. The results revealed that Gn and all truncated Gn proteins that contained the intact TMD (residues 206 to 224) were able to translocate to the Golgi complex and also rescued the Gc protein, which is retained in the endoplasmic reticulum when expressed alone, to this organelle. The rescued Gc proteins acquired endo-ß-N-acetylglucosaminidase H resistance. The Gn TMD could also target chimeric EGFP to the Golgi and retain the F protein, which is characteristically expressed on the surface of HRSV-infected cells, in the Golgi. However, chimeric BUN Gc did not translocate to the Golgi, suggesting that an interaction with Gn is involved in Golgi retention of the Gc protein. Collectively, these data demonstrate that the Golgi targeting and retention signal of BUN glycoproteins resides in the TMD of the Gn protein.

* Corresponding author. Mailing address: Institute of Virology, University of Glasgow, Church St., Glasgow G11 5JR, Scotland, United Kingdom. Phone: 44 141 330 4024. Fax: 44 141 337 2236. E-mail: elliott{at}vir.gla.ac.uk.

{dagger} Present address: Glasgow Dental Hospital and School, Glasgow G2 3JZ, Scotland, United Kingdom.

Journal of Virology, October 2004, p. 10793-10802, Vol. 78, No. 19
0022-538X/04/$08.00+0     DOI: 10.1128/JVI.78.19.10793-10802.2004
Copyright © 2004, American Society for Microbiology. All Rights Reserved.



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