PMID:1379079
| Citation |
Dontsova, OA, Rosen, KV, Bogdanova, SL, Skripkin, EA, Kopylov, AM and Bogdanov, AA (1992) Identification of the Escherichia coli 30S ribosomal subunit protein neighboring mRNA during initiation of translation. Biochimie 74:363-71 |
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| Abstract |
To identify the proteins of the 30S ribosomal subunit of E coli that neighbor mRNA in the ternary initiation complex (mRNA*30S subunit*tRNA(fMet), we used an affinity cross-linking approach in which photoactivated groups were attached to different positions along the mRNA chain. A series of mini-genes originating from the 5'-end region of the cro gene of lambda bacteriophage were constructed as templates for mini-mRNA synthesis. Two strategies were used to introduce photo-reactive agents into the message. According to the first, two transcripts were isolated from E coli and chemically derivatized at their 5'-ends with a photoinducible diaziril group. One of these messages allowed for localization of the 5'-end of the Shine-Dalgarno sequence while the other one allowed for labeling of the ribosome at the 5'-end side of the initiation AUG codon in the P site. According to the second approach, 5-azidouridine (5N3U) was randomly incorporated into mRNA transcripts during a T7 RNA polymerase catalyzed reaction by using a mixture of 5N3UTP and UTP. A message that had U residues at either -4, -3, -1, +2 and +14, +19, +20 positions was used (A from cro AUG is +1). Whereas cross-links with the 5N3U transcripts were essentially 'zero-length', the 5'-derivatized transcripts were covalently attached to ribosomal components about 14 A from the 5'-end. We found that proteins S1, S7, S5, S3 and S4 compose, or were close to, the ribosomal mRNA-binding site.(ABSTRACT TRUNCATED AT 250 WORDS) |
| Links | |
| Keywords |
Affinity Labels; Azides; Bacterial Proteins/chemistry; Bacterial Proteins/genetics; Base Sequence; Cross-Linking Reagents; Escherichia coli/genetics; Molecular Sequence Data; Peptide Chain Initiation, Translational/genetics; RNA, Bacterial/chemistry; RNA, Bacterial/genetics; RNA, Messenger/chemistry; RNA, Messenger/genetics; Ribosomal Proteins/chemistry; Ribosomal Proteins/genetics; Templates, Genetic; Uridine Triphosphate/analogs & derivatives |
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