Mutational analysis of sequences in the recF gene of Escherichia coli K-12 that affect expression.

TitleMutational analysis of sequences in the recF gene of Escherichia coli K-12 that affect expression.
Publication TypeJournal Article
Year of Publication1994
AuthorsSandler SJ, Clark AJ
JournalJ Bacteriol
Volume176
Issue13
Pagination4011-6
Date Published1994 Jul
ISSN0021-9193
KeywordsBacterial Proteins, Base Sequence, DNA Mutational Analysis, DNA-Binding Proteins, Escherichia coli, Escherichia coli Proteins, Gene Expression Regulation, Bacterial, Genes, Bacterial, Half-Life, Lac Operon, Molecular Sequence Data, Protein Biosynthesis, Recombinant Fusion Proteins, Regulatory Sequences, Nucleic Acid, Ribosomes
Abstract

The level of translation of recF-lacZ fusions is reduced 20-fold by nucleotides 49 to 146 of recF. In this region of recF, we found a previously described ribosome-interactive sequence called epsilon and a hexapyrimidine tract located just upstream of the epsilon sequence. Mutational studies indicate that the hexapyrimidine sequence is involved in at least some of the reduced translation. When the hexapyrimidine sequence is mutant, mutating epsilon increases the level of translation maximally. We ruled out the possibility that ribosome frameshifting explains most of the effect of these two sequences on expression and suspect that multiple mechanisms may be responsible. In a separate report, we show that mutations in the hexapyrimidine tract and epsilon increase expression of the full-sized recF gene.

Alternate JournalJ. Bacteriol.
PubMed ID8021183