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Operon structure and cotranslational subunit association direct protein assembly in bacteria

Item Type:Article
Title:Operon structure and cotranslational subunit association direct protein assembly in bacteria
Creators Name:Shieh, Y.W. and Minguez, P. and Bork, P. and Auburger, J.J. and Guilbride, D.L. and Kramer, G. and Bukau, B.
Abstract:Assembly of protein complexes is considered a post-translational process involving random collision of subunits. We show that within the Escherichia coli cytosol, bacterial luciferase subunits LuxA and LuxB assemble into complexes close to the site of subunit synthesis. Assembly efficiency decreases markedly if subunits are synthesized on separate mRNAs from genes integrated at distant chromosomal sites. Subunit assembly initiates cotranslationally on nascent LuxB in vivo. The ribosome-associated chaperone Trigger Factor delays the onset of cotranslational interactions until the LuxB dimer interface is fully exposed. Protein assembly thus is directly coupled to the translation process, and involves spatially confined, actively chaperoned cotranslational subunit interactions. Bacterial gene organization into operons therefore reflects a fundamental mechanism for spatiotemporal regulation vital to effective cotranslational protein complex assembly.
Keywords:Bacteria, Bacterial Genes, Bacterial Luciferases, Bacterial Proteins, Escherichia coli, Gene Order, Green Fluorescent Proteins, Luminescent Proteins, Molecular Chaperones, Operon, Protein Biosynthesis, Protein Subunits, Recombinant Fusion Proteins, Ribosomes, RNA Messenger , Secondary Protein Structure, Vibrio
Publisher:American Association for the Advancement of Science
Page Range:678-680
Date:6 November 2015
Official Publication:https://doi.org/10.1126/science.aac8171
PubMed:View item in PubMed

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