Duplicate divergence of two bacterial small heat shock proteins reduces the demand for Hsp70 in refolding of substrates

Autoři: Igor Obuchowski aff001;  Artur Piróg aff001;  Milena Stolarska aff001;  Bartłomiej Tomiczek aff001;  Krzysztof Liberek aff001
Působiště autorů: Department of Molecular and Cellular Biology, Intercollegiate Faculty of Biotechnology UG-MUG, University of Gdansk, Gdansk, Poland aff001
Vyšlo v časopise: Duplicate divergence of two bacterial small heat shock proteins reduces the demand for Hsp70 in refolding of substrates. PLoS Genet 15(10): e32767. doi:10.1371/journal.pgen.1008479
Kategorie: Research Article
doi: 10.1371/journal.pgen.1008479


Small heat shock proteins (sHsps) are a conserved class of ATP-independent chaperones that bind to aggregation-prone polypeptides at stress conditions. sHsps encage these polypeptides in assemblies, shielding them from further aggregation. To facilitate their subsequent solubilization and refolding by Hsp70 (DnaK) and Hsp100 (ClpB) chaperones, first, sHsps need to dissociate from the assemblies. In most γ-proteobacteria, these functions are fulfilled by a single sHsp (IbpA), but in a subset of Enterobacterales, a two-protein sHsp (IbpA and IbpB) system has evolved. To gain insight into the emergence of complexity within this chaperone system, we reconstructed the phylogeny of γ-proteobacteria and their sHsps. We selected proteins representative of systems comprising either one or two sHsps and analysed their ability to form sHsps-substrate assemblies. All the tested IbpA proteins, but not IbpB, stably interact with an aggregating substrate. Moreover, in Escherichia coli cells, ibpA but not ibpB suppress the growth defect associated with low DnaK level, which points to the major protective role of IbpA during the breakdown of protein quality control. We also examined how sHsps affect the association of Hsp70 with the assemblies at the initial phase of disaggregation and how they affect protein recovery after stress. Our results suggest that a single gene duplication event has given rise to the sHsp system consisting of a strong canonical binder, IbpA, and its non-canonical paralog IbpB that enhances sHsps dissociation from the assemblies. The cooperation between the sHsps reduces the demand for Hsp70 needed to outcompete them from the assemblies by promoting sHsps dissociation without compromising assembly formation at heat shock. This potentially increases the robustness and elasticity of sHsps protection against irreversible aggregation.

Klíčová slova:

Binding analysis – Evolutionary genetics – Glycerol – Heat shock response – Luciferase – Phylogenetics – Sedimentation – Polypeptides


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