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Identification of an Abelson murine leukemia virus-encoded protein present in transformed fibroblast and lymphoid cells

Witte, O. N. and Rosenberg, N. and Paskind, M. and Shields, A. and Baltimore, D. (1978) Identification of an Abelson murine leukemia virus-encoded protein present in transformed fibroblast and lymphoid cells. Proceedings of the National Academy of Sciences of the United States of America, 75 (5). pp. 2488-2492. ISSN 0027-8424. PMCID PMC392579. doi:10.1073/pnas.75.5.2488.

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Extracts from lymphoid and fibroblast cell lines transformed by Abelson murine leukemia virus (A-MuLV) contain a protein of molecular weight 120,000 (P120). Immunoprecipitation with specific sera shows that P120 contains regions homologous to the 5'-terminal segment of the MULV gag gene complex--p15, p12, and at least part of p30--but lacks detectable determinants of p10, reverse transcriptase, and the envelope glycoprotein. P120 is phosphorylated and has an intracellular half-life of 3--6 hr. In vitro translation of virion RNA from A-MuLV, with Moloney MuLV as helper, yields a product of molecular weight 120,000 with serological reactivity similar to that of the cellular P120. Translation of the RNA from the helper gave no P120. P120 is expressed in all lymphoid and fibroblastic cell lines we have tested that were transformed by A-MuLV but is not detectable in a lymphoid line in which the A-MuLV genome was established by infection but was not responsible for the transformation. Expression of P120 is selectively retained in clones of A-MuLV-transformed lymphocytes that convert to a nonproducer state after loss of expression of helper MuLV intracellular precursors. These results suggest that the P120 product of the A-MuLV genome may be responsible for maintenance of the transformed phenotype of lymphoid and fibroblast cells transformed by the virus.

Item Type:Article
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URLURL TypeDescription CentralArticle
Witte, O. N.0000-0003-4461-4533
Baltimore, D.0000-0001-8723-8190
Additional Information:© 1978 National Academy of Sciences. Contributed by David Baltimore, March 9, 1978. This work was supported by a grant from the American Cancer Society, Grant CA-14051 from the National Cancer Institute, and a contract from the Virus Cancer Program of the National Cancer Institute. O.N.W. is a postdoctoral fellow of the Helen Hay Whitney Foundation. D.B. is a Research Professor of the American Cancer Society. The costs of publication of this article were defrayed in part by the payment of page charges. This article must therefore be hereby marked "advertisement" in accordance with 18 U. S. C. §1734 solely to indicate this fact.
Funding AgencyGrant Number
American Cancer SocietyUNSPECIFIED
National Cancer InstituteUNSPECIFIED
Helen Hay Whitney FoundationUNSPECIFIED
Subject Keywords:A-MuLV, Abelson murine leukemia virus; M-MuLV, Moloney murine leukemia virus; FFU, focus-forming units; PFU, plaque-forming units; NaDodSO4, sodium dodecyl sulfate
Issue or Number:5
PubMed Central ID:PMC392579
Record Number:CaltechAUTHORS:20120726-131518549
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:32753
Deposited On:30 Jul 2012 16:01
Last Modified:09 Nov 2021 21:29

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