title: RNA-protein cross-linking in Escherichia coli 30S ribosomal subunits; determination of sites on 16S RNA that are cross-linked to proteins S3, S4, S5, S7, S8, S9, S11, S13, S19 and S21 by treatment with methyl p-azidophenyl acetimidate.
abstract: RNA-protein cross-links were introduced into E. coli 30S ribosomal subunits by treatment with methyl p-azidophenyl acetimidate. After partial nuclease digestion of the RNA moiety, a number of cross-linked RNA-protein complexes were isolated by a new three-step procedure. Protein and RNA analysis of the individual complexes gave the following results: Proteins S3, S4, S5 and S8 are cross-linked to the 5'-terminal tetranucleotide of 16S RNA. S5 is also cross-linked to the 16S RNA within an oligonucleotide encompassing positions 559-561. Proteins S11, S9, S19 and S7 are cross-linked to 16S RNA within oligonucleotides encompassing positions 702-705, 1130-1131, 1223-1231 and 1238-1240, respectively. Protein S13 is cross-linked to an oligonucleotide encompassing positions 1337-1338, and is also involved in an anomalous cross-link within positions 189-191. Protein S21 is cross-linked to the 3'-terminal dodecanucleotide of the 16S RNA.
mesh_terms: D001426:Bacterial Proteins / Q000032:analysis*; D001483:Base Sequence; D003432:Cross-Linking Reagents; D004926:Escherichia coli / Q000032:analysis; D007096:Imidoesters; D009690:Nucleic Acid Conformation; D012329:RNA, Bacterial / Q000032:analysis*; D012335:RNA, Ribosomal / Q000032:analysis*; D012269:Ribosomal Proteins / Q000032:analysis*
chemical_list: D001426:Bacterial Proteins; D003432:Cross-Linking Reagents; D007096:Imidoesters; D012329:RNA, Bacterial; D012335:RNA, Ribosomal; D012269:Ribosomal Proteins; C028066:methyl 4-azidophenylacetimidate