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Journal of Bacteriology, February 2001, p. 1277-1283, Vol. 183, No. 4
Department of Microbiology, Miami University,
Oxford, Ohio 45056
Received 5 July 2000/Accepted 17 November 2000
Translational efficiency of an AUG, CUG, GUG, or UUG initiation
codon was measured for the naturally leaderless cI mRNA
from bacteriophage
0021-9193/01/$04.00+0 DOI: 10.1128/JB.183.4.1277-1283.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.
The Initiation Codon Affects Ribosome Binding and Translational
Efficiency in Escherichia coli of cI mRNA
with or without the 5' Untranslated Leader
. In a cI-lacZ
translational fusion, only AUG supported a high level of expression;
GUG supported a low level of expression, while UUG and CUG expression
was barely above background levels. Addition of an untranslated
lac leader and Shine-Dalgarno sequence to cI
increased expression but still showed a dependence on an AUG for
maximum expression. cI-lacZ mRNA with an
AUG initiation codon showed a greater in vitro ribosome binding
strength and a higher level of full-length in vivo mRNA, suggesting
that the initiation codon is an important determinant of ribosome
binding strength and translational efficiency for mRNA with or
without the 5' untranslated leader.
*
Corresponding author. Mailing address: Department of
Microbiology, Miami University, Oxford, OH 45056. Phone: (513)
529-1694. Fax: (513) 529-2431. E-mail: janssegr{at}muohio.edu
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