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• W2017689151 abstract "Apolipoprotein B (apoB) mRNA editing is mediated by an enzyme complex which includes the catalytic subunit, apobec-1. Recombinant GST/APOBEC-1 binds with high specificity to a rat apoB RNA template as demonstrated by UV cross-linking and electrophoretic mobility shift assay (EMSA). ApoB RNA binding was competed by poly(U), poly(A,U), and tRNA, but not by poly(A) or other homopolymeric ribonucleotides. UV cross-linking of GST/APOBEC-1 to an apoB RNA template was uninfluenced by the binding of proteins of ~60 and ~44 kDa, present in S100 extracts prepared from different sources. The binding of these proteins was similarly uninfluenced by the simultaneous binding of GST/APOBEC-1. Moreover, the inclusion of heterologous S100 extracts in the RNA binding reactions completely abrogated the competitive displacement of GST/APOBEC-1 by tRNA. EMSA revealed the onset of RNA binding within 1-2 min, and its specificity was confirmed by a supershift with anti-GST/APOBEC-1 antisera. The structural specificity for apoB RNA binding, as inferred from EMSA, appears to be distinct from apoB RNA editing since wild-type chicken apoB RNA, which is not editable, and several mutant chicken apoB RNAs containing clustered mutations within the minimal apoB RNA editing cassette, bound with efficiency similar to the rat apoB RNA template. In conclusion, while the data suggest that apobec-1 binds AU-rich templates, the importance of this observation in the context of mammalian apoB mRNA editing remains unknown. Apolipoprotein B (apoB) mRNA editing is mediated by an enzyme complex which includes the catalytic subunit, apobec-1. Recombinant GST/APOBEC-1 binds with high specificity to a rat apoB RNA template as demonstrated by UV cross-linking and electrophoretic mobility shift assay (EMSA). ApoB RNA binding was competed by poly(U), poly(A,U), and tRNA, but not by poly(A) or other homopolymeric ribonucleotides. UV cross-linking of GST/APOBEC-1 to an apoB RNA template was uninfluenced by the binding of proteins of ~60 and ~44 kDa, present in S100 extracts prepared from different sources. The binding of these proteins was similarly uninfluenced by the simultaneous binding of GST/APOBEC-1. Moreover, the inclusion of heterologous S100 extracts in the RNA binding reactions completely abrogated the competitive displacement of GST/APOBEC-1 by tRNA. EMSA revealed the onset of RNA binding within 1-2 min, and its specificity was confirmed by a supershift with anti-GST/APOBEC-1 antisera. The structural specificity for apoB RNA binding, as inferred from EMSA, appears to be distinct from apoB RNA editing since wild-type chicken apoB RNA, which is not editable, and several mutant chicken apoB RNAs containing clustered mutations within the minimal apoB RNA editing cassette, bound with efficiency similar to the rat apoB RNA template. In conclusion, while the data suggest that apobec-1 binds AU-rich templates, the importance of this observation in the context of mammalian apoB mRNA editing remains unknown." @default.
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• W2017689151 date "1995-06-01" @default.
• W2017689151 modified "2023-10-06" @default.
• W2017689151 title "apobec-1, the Catalytic Subunit of the Mammalian Apolipoprotein B mRNA Editing Enzyme, Is a Novel RNA-binding Protein" @default.
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• W2017689151 doi "https://doi.org/10.1074/jbc.270.24.14762" @default.
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