A Neutralizable Epitope Common to the Envelope Glycoproteins of Ecotropic, Polytropic, Xenotropic, and Amphotropic Murine Leukemia Viruses
Overview
Authors
Affiliations
An epitope common to all classes of murine leukemia viruses (MuLVs) was detected by reactivity of MuLVs with a rat monoclonal antibody (MAb) termed 83A25. The antibody is of the immunoglobulin G2a isotype and was derived after fusion of NS-1 myeloma cells with spleen cells from a Fischer rat immunized with a Friend polytropic MuLV. The antibody reacted with nearly all members of the ecotropic, polytropic, xenotropic, and amphotropic classes of MuLVs. Unreactive viruses were limited to the Friend ecotropic MuLV, Rauscher MuLV, and certain recombinant derivatives of Friend ecotropic MuLV. The presence of an epitope common to nearly all MuLVs facilitated a direct quantitative focal immunofluorescence assay for MuLVs, including the amphotropic MuLVs for which no direct assay has been previously available. Previously described MAbs which react with all classes of MuLVs have been limited to those which react with virion core or transmembrane proteins. In contrast, protein immunoblot and immunoprecipitation analyses established that the epitope reactive with MAb 83A25 resides in the envelope glycoproteins of the viruses. Structural comparisons of reactive and nonreactive Friend polytropic viruses localized the epitope near the carboxyl terminus of the glycoprotein. The epitope served as a target for neutralization of all classes of MuLV with MAb 83A25. The efficiency of neutralization varied with different MuLV isolates but did not correlate with MuLV interference groups.
Stem cell activity-coupled suppression of endogenous retrovirus governs adult tissue regeneration.
Lyu Y, Kim S, Humphrey E, Nayak R, Guan Y, Liang Q Cell. 2024; 187(26):7414-7432.e26.
PMID: 39476839 PMC: 11682924. DOI: 10.1016/j.cell.2024.10.007.
Adaptive immunity to retroelements promotes barrier integrity.
Wells A, Lima-Junior D, Link V, Smelkinson M, Krishnamurthy S, Chi L bioRxiv. 2024; .
PMID: 39149266 PMC: 11326312. DOI: 10.1101/2024.08.09.606346.
Reactivated endogenous retroviruses promote protein aggregate spreading.
Liu S, Heumuller S, Hossinger A, Muller S, Buravlova O, Lichtenthaler S Nat Commun. 2023; 14(1):5034.
PMID: 37596282 PMC: 10439213. DOI: 10.1038/s41467-023-40632-z.
Endogenous retroviruses promote homeostatic and inflammatory responses to the microbiota.
Lima-Junior D, Krishnamurthy S, Bouladoux N, Collins N, Han S, Chen E Cell. 2021; 184(14):3794-3811.e19.
PMID: 34166614 PMC: 8381240. DOI: 10.1016/j.cell.2021.05.020.
Epigenetic silencing by SETDB1 suppresses tumour intrinsic immunogenicity.
Griffin G, Wu J, Iracheta-Vellve A, Patti J, Hsu J, Davis T Nature. 2021; 595(7866):309-314.
PMID: 33953401 PMC: 9166167. DOI: 10.1038/s41586-021-03520-4.