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• W1990640418 abstract "A procedure is described for the isolation of highly purified heavy-chain immunoglobulin mRNAs from a variety of mouse plasmacytomas (IgA, IgG, and IgM producers). The use of fresh tissue and the rapid isolation and direct extraction of membrane-bound polyribosomes were found to be essential in obtaining large quantities of undegraded heavy-chain mRNAs. The individual mRNAs were purified by two cycles of oligo(dT)-cellulose chromatography, sodium dodecyl sulfate--sucrose gradient centrifugation, and electrophoresis on 98% formamide containing polyacrylamide gels. When added to a cell-free protein-synthesizing system from wheat germ, the MPC-11 gamma2b and H2020 alpha heavy-chain mRNAs efficiently directed the synthesis of a predominant product of 55 000 molecular weight, while the synthesis of a 70 000 dalton protein in addition to other lower molecular weight polypeptides were observed with MOPC 3741 mu mRNA. All of these proteins were immunoprecipitable with class-specific heavy-chain antisera, and in the case of the gamma2b in vitro products good correspondence in a comparative trypsin--chymotrypsin fingerpring with in vivo labeled gamma2b heavy chain was observed. The gamma2b and a alpha heavy-chain mRNAs possessed a chain length of approximately 1800 nucleotides and the mu mRNA a size of approximately 2150 nucleotides when examined under stringent denaturation conditions. The purities of the alpha, gamma2b, and mu mRNAs were estimated to be 60--80%, 50--70%, and 50--83%, respectively, on the basis of their hybridization rates with cDNA probes in comparison to mRNA standards of known complexity. Heavy-chain mRNAs of the same class isolated from different mouse strains (Balb/C or NZB) display no detectable sequence differences in cross hybridization experiments, even though the cDNA--mRNA hybrids are submitted to stringent S1 nuclease digestion. These results indicate that allotypic determinants represent only a minor fraction of the heavy-chain constant region sequence in the mouse." @default.
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• W1990640418 date "1978-05-02" @default.
• W1990640418 modified "2023-10-01" @default.
• W1990640418 title "Isolation, purification, and properties of mouse heavy-chain immunoglobulin mRNAs" @default.
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• W1990640418 doi "https://doi.org/10.1021/bi00602a022" @default.
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