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Journal of Virology, December 1998, p. 9453-9458, Vol. 72, No. 12
0022-538X/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.

Simian Sarcoma-Associated Virus Fails To Infect Chinese Hamster Cells despite the Presence of Functional Gibbon Ape Leukemia Virus Receptors

Yuan-Tsang Ting,1 Carolyn A. Wilson,2 Karen B. Farrell,1 G. Jilani Chaudry,1 and Maribeth V. Eiden1,*

Laboratory of Cellular and Molecular Regulation, National Institute of Mental Health,1 and Laboratory of Cellular Immunology, Division of Cellular and Gene Therapies, Center for Biologics Evaluation and Research, Food and Drug Administration,2 Bethesda, Maryland 20892

Received 24 April 1998/Accepted 20 August 1998

We have sequenced the envelope genes from each of the five members of the gibbon ape leukemia virus (GALV) family of type C retroviruses. Four of the GALVs, including GALV strain SEATO (GALV-S), were originally isolated from gibbon apes, whereas the fifth member of this family, simian sarcoma-associated virus (SSAV), was isolated from a woolly monkey and shares 78% amino acid identity with GALV-S. To determine whether these viruses have identical host ranges, we evaluated the susceptibility of several cell lines to either GALV-S or SSAV infection. GALV-S and SSAV have the same host range with the exception of Chinese hamster lung E36 cells, which are susceptible to GALV-S but not SSAV. We used retroviral vectors that differ only in their envelope composition (e.g., they contain either SSAV or GALV-S envelope protein) to show that the envelope of SSAV restricts entry into E36 cells. Although unable to infect E36 cells, SSAV infects GALV-resistant murine cells expressing the E36-derived viral receptor, HaPit2. These results suggest that the receptors present on E36 cells function for SSAV. We have constructed several vectors containing GALV-S/SSAV chimeric envelope proteins to map the region of the SSAV envelope that blocks infection of E36 cells. Vectors bearing chimeric envelopes comprised of the N-terminal region of the GALV-S SU protein and the C-terminal region of SSAV infect E36 cells, whereas vectors containing the N-terminal portion of the SSAV SU protein and C-terminal portion of GALV-S fail to infect E36 cells. This finding indicates that the region of the SSAV envelope protein responsible for restricting SSAV infection of E36 cells lies within its amino-terminal region.

* Corresponding author. Mailing address: Building 36, Room 2A11, Laboratory of Cellular and Molecular Regulation, National Institute of Mental Health, Bethesda, MD 20892. Phone: (301) 402-1641. Fax: (301) 402-6808. E-mail: m_eiden{at}codon.nih.gov.

Journal of Virology, December 1998, p. 9453-9458, Vol. 72, No. 12
0022-538X/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.


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