Multifaceted Stoichiometry Control of Bacterial Operons Revealed by Deep Proteome Quantification

Zhao, Jing and Zhang, Hong and Qin, Bo and Nikolay, Rainer and He, Qing-Yu and Spahn, Christian M. T. and Zhang, Gong (2019) Multifaceted Stoichiometry Control of Bacterial Operons Revealed by Deep Proteome Quantification. Frontiers in Genetics, 10. ISSN 1664-8021

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Abstract

More than half of the protein-coding genes in bacteria are organized in polycistronic operons composed of two or more genes. It remains under debate whether the operon organization maintains the stoichiometric expression of the genes within an operon. In this study, we performed a label-free data-independent acquisition hyper reaction monitoring mass-spectrometry (HRM-MS) experiment to quantify the Escherichia coli proteome in exponential phase and quantified 93.6% of the cytosolic proteins, covering 67.9% and 56.0% of the translating polycistronic operons in BW25113 and MG1655 strains, respectively. We found that the translational regulation contributes largely to the proteome complexity: the shorter operons tend to be more tightly controlled for stoichiometry than longer operons; the operons which mainly code for complexes is more tightly controlled for stoichiometry than the operons which mainly code for metabolic pathways. The gene interval (distance between adjacent genes in one operon) may serve as a regulatory factor for stoichiometry. The catalytic efficiency might be a driving force for differential expression of enzymes encoded in one operon. These results illustrated the multifaceted nature of the operon regulation: the operon unified transcriptional level and gene-specific translational level. This multi-level regulation benefits the host by optimizing the efficiency of the productivity of metabolic pathways and maintenance of different types of protein complexes.

Item Type: Article
Subjects: Euro Archives > Medical Science
Depositing User: Managing Editor
Date Deposited: 11 Mar 2023 06:02
Last Modified: 06 Feb 2024 03:49
URI: http://publish7promo.com/id/eprint/1982

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