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Xenopus fibrinogen: characterization of the mRNAs for the three subunits.
Holland LJ
,
Wangh LJ
.
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We purified and characterized the mRNAs coding for each of the three subunits of Xenopus fibrinogen. Purification was accomplished by electrophoretic separation of liver polyadenylated RNA in a fully denaturing gel, followed by recovery of the RNA from the gel via transfer to an ion-exchange membrane. This procedure yielded fractions which were highly enriched for the mRNAs for each of the fibrinogen chains. The fibrinogen mRNAs were identified by two methods: (i) in vitro translation followed by subunit-specific cleavage with the proteases thrombin and batroxobin; and (ii) cross-hybridization with cDNA clones for individual subunits of rat fibrinogen. The results demonstrate that the A alpha and gamma chains of frog fibrinogen are each coded by a single mRNA species. The A alpha mRNA is ca. 3,100 nucleotides in length, which is nearly twice the minimum size required to code for the A alpha precursor polypeptide. The gamma chain mRNA comprises about 1,600 bases and includes only a small untranslated region. In contrast, the B beta subunit is synthesized from two mRNAs, one of which is 2,500 and the other 1,800 nucleotides long. The 2,500-base mRNA includes a large noncoding region, whereas the smaller one is near the minimum required size. The larger B beta mRNA is ca, fivefold more abundant that the smaller species.
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