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- W2058772709 abstract "The site of Escherichia coli 16S ribosomal RNA cross-linked to the 5'-anticodon base of A site bound E. coli valyl-tRNA was identified. Cross-linking was via the affinity probe 6-[(2-nitro-4-azidophenyl)amino]caproate (NAK) or 3-[[2-[(2-nitro-4-azidophenyl)amino]ethyl]dithio]propionate (SNAP) attached to the carboxyl group of the 5'-anticodon base 5-(carboxyethoxy)uridine via an ethylenediamine spacer [Gornicki, P., Ciesiolka, J., & Ofengand, J. (1985) Biochemistry (preceding paper in this issue)]. With both probes, RNase T1 digestion of the isolated 16S RNA-tRNA covalent complex, 5'-32P postlabeling, and gel electrophoresis yielded two oligonucleotides larger than any fragments from non-cross-linked tRNA or rRNA. Appearance of the oligomers was dependent on the presence of the probe on the tRNA. Unmodified tRNA in the A and/or P sites did not yield any product. The presence of elongation factor Tu in the incubation mixture was also required. Dithiothreitol (DDT) treatment of the SNAP-induced covalent complex prior to electrophoresis also abolished the oligomers. Only the larger of the two oligomers (present in a 3:1 ratio) was sequenced. The SNAP dimer was cleaved with DTT, and the rRNA and tRNA oligomers were separated and sequenced as monomers. The NAK dimer was sequenced without cleavage by taking advantage of the differences in electrophoretic mobility among sequence and/or composition isomers of the same length. In both cases, the rRNA oligomer was identified as UACACACCG1401, and the nucleotide cross-linked was shown to be the C1400 residue. The expected tRNA modification site was also identified.(ABSTRACT TRUNCATED AT 250 WORDS)" @default.
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- W2058772709 date "1985-08-27" @default.
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- W2058772709 title "Identification of the site of crosslinking in 16S rRNA of an aromatic azide photoaffinity probe attached to the 5'-anticodon base of A site-bound tRNA" @default.
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- W2058772709 doi "https://doi.org/10.1021/bi00339a031" @default.
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