title: Biased codon usage in signal peptides: a role in protein export.
abstract: The signal peptide of proteins exported via the general secretory pathway encodes structural features that enable the targeting and export of the protein to the periplasm. Recent studies have shown biased codon usage at the second amino acid position and a high usage of non-optimal codons within the signal peptide. Altering these biases in codon usage can have deleterious effects on protein folding and export. We propose that these codon-usage biases act in concert to optimize the export process through modulating ribosome spacing on the transcript. This highlights a new aspect of protein export and implies that codon usage in the signal peptide encodes signals that are important for protein targeting and export to the periplasm.
authors.affiliation: School of Molecular and Microbial Sciences, University of Queensland, St. Lucia 4072, Brisbane, QLD, Australia.
authors.forename: Yaramah M
authors.initials: YM
authors.lastname: Zalucki
authors.forename: Ifor R
authors.initials: IR
authors.lastname: Beacham
authors.forename: Michael P
authors.initials: MP
authors.lastname: Jennings
mesh_terms: D000595:Amino Acid Sequence; D003062:Codon; D004926:Escherichia coli / Q000737:chemistry / Q000235:genetics* / Q000378:metabolism*; D029968:Escherichia coli Proteins / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D008969:Molecular Sequence Data; D014176:Protein Biosynthesis; D017510:Protein Folding; D021382:Protein Sorting Signals; D021381:Protein Transport
chemical_list: D003062:Codon; D029968:Escherichia coli Proteins; D021382:Protein Sorting Signals