Distribution of 5'-triphosphate Termini on the MRNA of Escherichia Coli

Overview

Journal J Bacteriol

Publisher American Society for Microbiology

Specialty Microbiology

Date 1989 Jan 1

PMID 2464575

Citations 11

Authors

C D Bieger

D P NIERLICH

Affiliations

Soon will be listed here.

Abstract

We have determined the distribution of 5'-nucleoside triphosphates on the RNA in Escherichia coli. These groups represent the initial nucleoside triphosphate incorporated when RNA polymerase initiates transcription. It was estimated that at least 15% of polysome-associated messengers had triphosphates. This was interpreted to mean that removal of the triphosphate or messenger leader is not necessary for the functioning of most mRNAs but that a substantial amount of messenger processing occurs in the polysome pool. We found that the ratio of GTP- to ATP-initiated messengers was about 2 to 1. Since prior work has indicated that G- and A-initiated RNAs decay at the same rate and since a compilation of messenger start sites shows an A preference, this value implies that there is a significant physiological selection of G-initiated transcripts. We also characterized the 5'-terminal groups on RNAs in other fractions. A small amount was found associated with 30S ribosomes, presumably in initiation complexes; such complexes have not previously been detected in situ. In addition, it was concluded that the 5' terminus of rRNA precursors is processed more rapidly than is implied by the current literature.

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