PMID:16137683

Citation	Viegas, SC, Schmidt, D, Kasche, V, Arraiano, CM and Ignatova, Z (2005) Effect of the increased stability of the penicillin amidase mRNA on the protein expression levels. FEBS Lett. 579:5069-73
Abstract	Several factors at transcriptional, post-transcriptional or post-translational level determine the fate of a target protein and can severely restrict its yield. Here, we focus on the post-transcriptional regulation of the biosynthesis of the periplasmic protein, penicillin amidase (PA). The PA mRNA stability was determined under depleted RNase conditions in strains carrying single or multiple RNase deletions. Single deletion of the endonuclease RNase E yielded, as the highest, a fourfold stabilization of the PA mRNA. This effect, however, was reduced twice at post-translational level. The RNase II, generating secondary exonucleolytic cleavages in the mRNA, although not significantly influencing the PA mRNA decay, led also to an increase of the amount of mature PA. The non-proportional correlation between increased mRNA longevity and amount of active enzyme propose that the rational strategies for yield improvement must be based on a simultaneous tuning of more than one yield restricting factor.
Links	PubMed Online version:10.1016/j.febslet.2005.08.018
Keywords	Escherichia coli Proteins/genetics; Escherichia coli Proteins/metabolism; Gene Expression Regulation; Penicillin Amidase/genetics; Penicillin Amidase/metabolism; Protein Processing, Post-Translational; RNA Processing, Post-Transcriptional; RNA Stability; RNA, Messenger/metabolism; Ribonucleases/metabolism
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