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. 1978 Jul;27(1):118–126. doi: 10.1128/jvi.27.1.118-126.1978

RNA associated with murine intracisternal type A particles codes for the main particle protein.

B M Paterson, S Segal, K K Lueders, E L Kuff
PMCID: PMC354145  PMID: 691107

Abstract

Intracisternal type A particles were isolated from MOPC-104E myeloma grown subcutaneously and from N 4 neuroblastoma cells in culture. Polyadenylated RNA was prepared from the particles and tested in a cell-free translation system derived from rabbit reticulocytes. RNA from the two sources directed the synthesis of multiple polypeptides with similar distributions of electrophoretic mobilities in sodium dodecyl sulfate-containing polyacrylamide gels, including one conponent of the same size as the major A-particle structural protein (73,000 daltons). Analysis of the RNAs by electrophoresis in methyl mercury-containing agarose gels revealed a 35S component common to A-particles from both cell types. This was a major component of the N4 preparations, whereas a 28S species predominated in the case of MOPC-104E. These two RNAs (35S from N4 cells and 28S from MOPC-104E), when isolated on isokinetic sucrose gradients, each directed the synthesis of a 73,000-molecular-weight polypeptide that comigrated on gels with authentic A-particle structural protein. Idnetity of the cell-free product was confirmed by two-dimensional analysis of the [35S]methionine-labeled tryptic peptides. The N4 RNA preparations also contained a major32S component which did not code effectively for the A-particle structural protein.

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Selected References

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