Abstract
We have purified three low-abundance hepatic mRNAs to near homogeneity by polysome immunoadsorption. The mRNAs coding for the precursor of ornithine transcarbamoylase [carbamoylphosphate:L-ornithine carbamoyltransferase, EC 2.1.3.3], the precursor of the beta-subunit of propionyl-CoA carboxylase [propionyl-CoA:carbon dioxide ligase (ADP-forming), EC 6.4.1.3], and cystathionine beta-synthase [L-serine hydro-lyase (adding homocysteine), EC 4.2.1.22], representing approximately 0.20, 0.02, and 0.015% of total hepatic mRNA, respectively, were purified 450- to 6,300-fold. We used the following steps: interaction of rat liver polysomes with an IgG fraction of monospecific antisera raised against each polypeptide; immobilization of polysome-antibody complexes on a protein A-Sepharose column; removal of the bulk of polysomes by extensive washing; dissociation of ribosomal subunits and elution of specific mRNA with EDTA; and isolation of the eluted mRNA by chromatography on an oligo(dT)-cellulose column. It seems likely that this procedure will permit isolation of other low-abundance mRNAs and subsequent cloning of their respective cDNAs.
MeSH Terms
Animals
Antigen-Antibody Complex
Carboxy-Lyases/genetics
Cystathionine beta-Synthase/genetics
Enzyme Precursors/genetics
Hydro-Lyases/genetics
Immune Sera
Liver/enzymology
Male
Methylmalonyl-CoA Decarboxylase
Ornithine Carbamoyltransferase/genetics
Poly A/genetics
Polyribosomes/metabolism
Protein Biosynthesis
RNA/genetics
RNA, Messenger/genetics,isolation & purification
Rats
Chemicals
Antigen-Antibody Complex
Enzyme Precursors
Immune Sera
RNA, Messenger
Poly A
RNA
Ornithine Carbamoyltransferase
Carboxy-Lyases
Hydro-Lyases
Cystathionine beta-Synthase
Methylmalonyl-CoA Decarboxylase
Authors & Affiliations
2 authors, click to expand affiliations / ORCID
Kraus J P
Rosenberg L E
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