title: Bimodal protein solubility distribution revealed by an aggregation analysis of the entire ensemble of Escherichia coli proteins.
abstract: Protein folding often competes with intermolecular aggregation, which in most cases irreversibly impairs protein function, as exemplified by the formation of inclusion bodies. Although it has been empirically determined that some proteins tend to aggregate, the relationship between the protein aggregation propensities and the primary sequences remains poorly understood. Here, we individually synthesized the entire ensemble of Escherichia coli proteins by using an in vitro reconstituted translation system and analyzed the aggregation propensities. Because the reconstituted translation system is chaperone-free, we could evaluate the inherent aggregation propensities of thousands of proteins in a translation-coupled manner. A histogram of the solubilities, based on data from 3,173 translated proteins, revealed a clear bimodal distribution, indicating that the aggregation propensities are not evenly distributed across a continuum. Instead, the proteins can be categorized into 2 groups, soluble and aggregation-prone proteins. The aggregation propensity is most prominently correlated with the structural classification of proteins, implying that the prediction of aggregation propensity requires structural information about the protein.
authors.affiliation: Department of Medical Genome Sciences, Graduate School of Frontier Sciences, University of Tokyo, Kashiwa, Chiba 277-8562, Japan.
authors.forename: Tatsuya
authors.initials: T
authors.lastname: Niwa
authors.forename: Bei-Wen
authors.initials: BW
authors.lastname: Ying
authors.forename: Katsuyo
authors.initials: K
authors.lastname: Saito
authors.forename: WenZhen
authors.initials: W
authors.lastname: Jin
authors.forename: Shoji
authors.initials: S
authors.lastname: Takada
authors.forename: Takuya
authors.initials: T
authors.lastname: Ueda
authors.forename: Hideki
authors.initials: H
authors.lastname: Taguchi
mesh_terms: D002474:Cell-Free System; D019281:Dimerization; D029968:Escherichia coli Proteins / Q000737:chemistry*; D014176:Protein Biosynthesis; D011489:Protein Denaturation; D017510:Protein Folding; D012995:Solubility
chemical_list: D029968:Escherichia coli Proteins