Document Detail

Detailed mapping of determinants within the porcine endogenous retrovirus envelope surface unit identifies critical residues for human cell infection within the proline-rich region.
MedLine Citation:
PMID:  22696659     Owner:  NLM     Status:  MEDLINE    
Replication-competent porcine endogenous retroviruses (PERVs) are either human cell tropic (PERV-A and PERV-B) or non-human cell tropic (PERV-C). We previously demonstrated that PERV in vitro cell tropism is modulated by 2 residues within the C terminus of SU and that the PERV receptor binding domain (RBD) extends beyond the variable regions A and B (VRA and VRB, respectively), to include the proline rich-region (PRR) of SU (M. Gemeniano et al., Virology 346:108-117, 2000; T. Argaw et al., J. Virol. 82:7483-7489, 2008). The present study aimed to identify the specific elements within the PERV RBD that interact with the C-terminal elements of SU to facilitate human cell infection. We constructed a series of chimeric and mutated envelopes between PERV-A and PERV-C and using pseudotyped retroviral vectors to map the human cell tropism-determining sequences within the PERV RBD. We show that the PRR from PERV-A is both necessary and sufficient to allow human cell infection when substituted into the homologous region of the PERV-C envelope carrying two C-terminal amino acid substitutions shown to influence human cell tropism, Q374R and I412V (PERV-Crv). Furthermore, substitution of a single amino acid residue in the PRR of the non-human-tropic PERV-Crv envelope allows vectors carrying this envelope to infect human cells. Receptor interference assays showed that these modified PERV-C envelopes do not bind either of the human PERV-A receptors, suggesting the presence of a distinct human PERV-C receptor. Finally, vectors carrying these modified PERV-C envelopes infect primary human endothelial cells, a cell type likely to be exposed to PERV in clinical use of certain porcine xenotransplantation products.
Takele Argaw; Carolyn A Wilson
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2012-06-13
Journal Detail:
Title:  Journal of virology     Volume:  86     ISSN:  1098-5514     ISO Abbreviation:  J. Virol.     Publication Date:  2012 Sep 
Date Detail:
Created Date:  2012-08-10     Completed Date:  2012-11-05     Revised Date:  2013-07-12    
Medline Journal Info:
Nlm Unique ID:  0113724     Medline TA:  J Virol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  9096-104     Citation Subset:  IM    
Gene Transfer and Immunogenicity Branch, Division of Cellular and Gene Therapies, Center for Biologics Evaluation and Research, FDA, Bethesda, Maryland, USA.
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MeSH Terms
Amino Acid Motifs
Amino Acid Sequence
Cell Line
Endogenous Retroviruses / chemistry,  genetics,  physiology*
Gammaretrovirus / chemistry,  genetics,  physiology*
Gene Products, env / chemistry*,  genetics,  metabolism*
Molecular Sequence Data
Proline / genetics,  metabolism
Protein Structure, Tertiary
Swine / virology*
Viral Tropism
Virus Internalization
Grant Support
//Howard Hughes Medical Institute
Reg. No./Substance:
0/Gene Products, env; 147-85-3/Proline

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