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The Functionality of IbpA from Acholeplasma laidlawii Is Governed by Dynamic Rearrangement of Its Globular–Fibrillar Quaternary Structure

Small heat shock proteins (sHSPs) represent a first line of stress defense in many bacteria. The primary function of these molecular chaperones involves preventing irreversible protein denaturation and aggregation. In Escherichia coli, fibrillar EcIbpA binds unfolded proteins and keeps them in a fol...

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Autores principales: Chernova, Liliya S., Vishnyakov, Innokentii E., Börner, Janek, Bogachev, Mikhail I., Thormann, Kai M., Kayumov, Airat R.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2023
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10607609/
https://www.ncbi.nlm.nih.gov/pubmed/37895124
http://dx.doi.org/10.3390/ijms242015445
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author Chernova, Liliya S.
Vishnyakov, Innokentii E.
Börner, Janek
Bogachev, Mikhail I.
Thormann, Kai M.
Kayumov, Airat R.
author_facet Chernova, Liliya S.
Vishnyakov, Innokentii E.
Börner, Janek
Bogachev, Mikhail I.
Thormann, Kai M.
Kayumov, Airat R.
author_sort Chernova, Liliya S.
collection PubMed
description Small heat shock proteins (sHSPs) represent a first line of stress defense in many bacteria. The primary function of these molecular chaperones involves preventing irreversible protein denaturation and aggregation. In Escherichia coli, fibrillar EcIbpA binds unfolded proteins and keeps them in a folding-competent state. Further, its structural homologue EcIbpB induces the transition of EcIbpA to globules, thereby facilitating the substrate transfer to the HSP70-HSP100 system for refolding. The phytopathogenic Acholeplasma laidlawii possesses only a single sHSP, AlIbpA. Here, we demonstrate non-trivial features of the function and regulation of the chaperone-like activity of AlIbpA according to its interaction with other components of the mycoplasma multi-chaperone network. Our results show that the efficiency of the A. laidlawii multi-chaperone system is driven with the ability of AlIbpA to form both globular and fibrillar structures, thus combining functions of both IbpA and IbpB when transferring the substrate proteins to the HSP70-HSP100 system. In contrast to EcIbpA and EcIbpB, AlIbpA appears as an sHSP, in which the competition between the N- and C-terminal domains regulates the shift of the protein quaternary structure between a fibrillar and globular form, thus representing a molecular mechanism of its functional regulation. While the C-terminus of AlIbpA is responsible for fibrils formation and substrate capture, the N-terminus seems to have a similar function to EcIbpB through facilitating further substrate protein disaggregation using HSP70. Moreover, our results indicate that prior to the final disaggregation process, AlIbpA can directly transfer the substrate to HSP100, thereby representing an alternative mechanism in the HSP interaction network.
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spelling pubmed-106076092023-10-28 The Functionality of IbpA from Acholeplasma laidlawii Is Governed by Dynamic Rearrangement of Its Globular–Fibrillar Quaternary Structure Chernova, Liliya S. Vishnyakov, Innokentii E. Börner, Janek Bogachev, Mikhail I. Thormann, Kai M. Kayumov, Airat R. Int J Mol Sci Article Small heat shock proteins (sHSPs) represent a first line of stress defense in many bacteria. The primary function of these molecular chaperones involves preventing irreversible protein denaturation and aggregation. In Escherichia coli, fibrillar EcIbpA binds unfolded proteins and keeps them in a folding-competent state. Further, its structural homologue EcIbpB induces the transition of EcIbpA to globules, thereby facilitating the substrate transfer to the HSP70-HSP100 system for refolding. The phytopathogenic Acholeplasma laidlawii possesses only a single sHSP, AlIbpA. Here, we demonstrate non-trivial features of the function and regulation of the chaperone-like activity of AlIbpA according to its interaction with other components of the mycoplasma multi-chaperone network. Our results show that the efficiency of the A. laidlawii multi-chaperone system is driven with the ability of AlIbpA to form both globular and fibrillar structures, thus combining functions of both IbpA and IbpB when transferring the substrate proteins to the HSP70-HSP100 system. In contrast to EcIbpA and EcIbpB, AlIbpA appears as an sHSP, in which the competition between the N- and C-terminal domains regulates the shift of the protein quaternary structure between a fibrillar and globular form, thus representing a molecular mechanism of its functional regulation. While the C-terminus of AlIbpA is responsible for fibrils formation and substrate capture, the N-terminus seems to have a similar function to EcIbpB through facilitating further substrate protein disaggregation using HSP70. Moreover, our results indicate that prior to the final disaggregation process, AlIbpA can directly transfer the substrate to HSP100, thereby representing an alternative mechanism in the HSP interaction network. MDPI 2023-10-22 /pmc/articles/PMC10607609/ /pubmed/37895124 http://dx.doi.org/10.3390/ijms242015445 Text en © 2023 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Chernova, Liliya S.
Vishnyakov, Innokentii E.
Börner, Janek
Bogachev, Mikhail I.
Thormann, Kai M.
Kayumov, Airat R.
The Functionality of IbpA from Acholeplasma laidlawii Is Governed by Dynamic Rearrangement of Its Globular–Fibrillar Quaternary Structure
title The Functionality of IbpA from Acholeplasma laidlawii Is Governed by Dynamic Rearrangement of Its Globular–Fibrillar Quaternary Structure
title_full The Functionality of IbpA from Acholeplasma laidlawii Is Governed by Dynamic Rearrangement of Its Globular–Fibrillar Quaternary Structure
title_fullStr The Functionality of IbpA from Acholeplasma laidlawii Is Governed by Dynamic Rearrangement of Its Globular–Fibrillar Quaternary Structure
title_full_unstemmed The Functionality of IbpA from Acholeplasma laidlawii Is Governed by Dynamic Rearrangement of Its Globular–Fibrillar Quaternary Structure
title_short The Functionality of IbpA from Acholeplasma laidlawii Is Governed by Dynamic Rearrangement of Its Globular–Fibrillar Quaternary Structure
title_sort functionality of ibpa from acholeplasma laidlawii is governed by dynamic rearrangement of its globular–fibrillar quaternary structure
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10607609/
https://www.ncbi.nlm.nih.gov/pubmed/37895124
http://dx.doi.org/10.3390/ijms242015445
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