PubMed · 6975082
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T Nishikawa, T Hashimoto, S Kurihara. 1981. Complement-fixing intercellular antibodies.. https://pubmed.ncbi.nlm.nih.gov/6975082/
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A deforming arthropathy confined to the hands developed in a woman with polymyositis of three year's duration. Roentgenograms showed distal subluxations of several fingers, especially the thumb, asymmetrical marginal erosions of the phalanges and periarticular calcifications. These roentgenographic findings are considered to be specific of polymyositis associated with anti-Jo-1 antibody.
In eukaryotes, many small nuclear RNAs contain either a trimethylguanosine cap structure of a gamma-monomethyl (me) cap structure. Previously, we reported the characterization of anti-mepppG antibodies which recognize methyl-capped RNAs with G as the initiation nucleotide. We report here the preparation of antibodies against mepppN cap structure. Anti-mepppN antibodies recognized only mepppN from a mixture of mepppN and pppN and immunoprecipitated mepppA-capped U3 small nucleolar RNA from a mixture of cowpea cell RNAs. These anti-mepppN antibodies recognized methylated nucleoside triphosphates (mepppA, mepppC, mepppG and mepppU) with nearly equal efficiency; however, these antibodies did not recognize methyl phosphate or methylated mononucleotides. These antibodies will be useful in the identification and characterization of all methyl-capped RNAs no matter which is the initiation nucleotide.
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