Secretory signal sequence non-optimal codons are required for expression and export of beta-lactamase

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Title Secretory signal sequence non-optimal codons are required for expression and export of beta-lactamase
Author Zalucki, Yaramah M.; Gittins, Karlee L.; Jennings, Michael Paul
Journal Name Biochemical and Biophysical Research Communications
Year Published 2008
Place of publication United States
Publisher Elsevier
Abstract In this study we altered the codon usage in the signal sequence of the bla gene, encoding beta-lactamase in Escherichia coli. Changing all of the thirteen non-optimal codons to optimal lowered expression 4-fold as measured by minimum inhibitory concentration (MIC) to the beta-lactam antibiotic ampicillin. The difference in ampicillin resistance was reduced at 28 degrees C compared to expression at 37 degrees C, suggesting that the optimised bla allele is misfolded and degraded by heat-shock regulated proteases. A screen was carried out, designed specifically to identify revertants with changes in codon usage resulting in higher MIC to ampicillin. The nine revertants revealed by this method all had optimal to non-optimal codon changes in the signal sequence. These results, and those of our previous study with maltose binding protein model system, confirm that non-optimal codons are important for expression and export of secretory proteins via both the SecB-dependent and -independent pathways.
Peer Reviewed Yes
Published Yes
Alternative URI http://dx.doi.org/10.1016/j.bbrc.2007.11.093
Volume 366
Issue Number 1
Page from 135
Page to 141
ISSN 0006-291X
Date Accessioned 2010-07-21
Language en_AU
Research Centre Institute for Glycomics
Faculty Faculty of Science, Environment, Engineering and Technology
Subject Protein Trafficking
URI http://hdl.handle.net/10072/33007
Publication Type Journal Articles (Refereed Article)
Publication Type Code c1x

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