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Chernova LS, Vishnyakov IE, Börner J, Bogachev MI, Thormann KM, Kayumov AR. The Functionality of IbpA from Acholeplasma laidlawii Is Governed by Dynamic Rearrangement of Its Globular-Fibrillar Quaternary Structure. Int J Mol Sci 2023; 24:15445. [PMID: 37895124 PMCID: PMC10607609 DOI: 10.3390/ijms242015445] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2023] [Revised: 10/18/2023] [Accepted: 10/20/2023] [Indexed: 10/29/2023] Open
Abstract
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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Affiliation(s)
- Liliya S. Chernova
- Institute of Fundamental Medicine and Biology, Kazan Federal University, Kremlevskaya 18, 420008 Kazan, Russia;
- Institute of Cytology, Russian Academy of Sciences, Tikhoretsky Ave. 4, 194064 St. Petersburg, Russia;
- Institute of Microbiology and Molecular Biology, Justus Liebig University, Heinrich-Buff-Ring 26, 35392 Giessen, Germany; (J.B.); (K.M.T.)
| | - Innokentii E. Vishnyakov
- Institute of Cytology, Russian Academy of Sciences, Tikhoretsky Ave. 4, 194064 St. Petersburg, Russia;
| | - Janek Börner
- Institute of Microbiology and Molecular Biology, Justus Liebig University, Heinrich-Buff-Ring 26, 35392 Giessen, Germany; (J.B.); (K.M.T.)
| | - Mikhail I. Bogachev
- Centre for Digital Telecommunication Technologies, St. Petersburg Electrotechnical University, Professora Popova 5, 197376 St. Petersburg, Russia;
| | - Kai M. Thormann
- Institute of Microbiology and Molecular Biology, Justus Liebig University, Heinrich-Buff-Ring 26, 35392 Giessen, Germany; (J.B.); (K.M.T.)
| | - Airat R. Kayumov
- Institute of Fundamental Medicine and Biology, Kazan Federal University, Kremlevskaya 18, 420008 Kazan, Russia;
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Houben B, Michiels E, Ramakers M, Konstantoulea K, Louros N, Verniers J, van der Kant R, De Vleeschouwer M, Chicória N, Vanpoucke T, Gallardo R, Schymkowitz J, Rousseau F. Autonomous aggregation suppression by acidic residues explains why chaperones favour basic residues. EMBO J 2020; 39:e102864. [PMID: 32237079 PMCID: PMC7265246 DOI: 10.15252/embj.2019102864] [Citation(s) in RCA: 26] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2019] [Revised: 02/26/2020] [Accepted: 02/27/2020] [Indexed: 12/13/2022] Open
Abstract
Many chaperones favour binding to hydrophobic sequences that are flanked by basic residues while disfavouring acidic residues. However, the origin of this bias in protein quality control remains poorly understood. Here, we show that while acidic residues are the most efficient aggregation inhibitors, they are also less compatible with globular protein structure than basic amino acids. As a result, while acidic residues allow for chaperone-independent control of aggregation, their use is structurally limited. Conversely, we find that, while being more compatible with globular structure, basic residues are not sufficient to autonomously suppress protein aggregation. Using Hsp70, we show that chaperones with a bias towards basic residues are structurally adapted to prioritize aggregating sequences whose structural context forced the use of the less effective basic residues. The hypothesis that emerges from our analysis is that the bias of many chaperones for basic residues results from fundamental thermodynamic and kinetic constraints of globular structure. This also suggests the co-evolution of basic residues and chaperones allowed for an expansion of structural variety in the protein universe.
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Affiliation(s)
- Bert Houben
- Switch Laboratory, VIB Center for Brain and Disease Research, Leuven, Belgium
- Department of Cellular and Molecular Medicine, KULeuven, Leuven, Belgium
| | - Emiel Michiels
- Switch Laboratory, VIB Center for Brain and Disease Research, Leuven, Belgium
- Department of Cellular and Molecular Medicine, KULeuven, Leuven, Belgium
| | - Meine Ramakers
- Switch Laboratory, VIB Center for Brain and Disease Research, Leuven, Belgium
- Department of Cellular and Molecular Medicine, KULeuven, Leuven, Belgium
| | - Katerina Konstantoulea
- Switch Laboratory, VIB Center for Brain and Disease Research, Leuven, Belgium
- Department of Cellular and Molecular Medicine, KULeuven, Leuven, Belgium
| | - Nikolaos Louros
- Switch Laboratory, VIB Center for Brain and Disease Research, Leuven, Belgium
- Department of Cellular and Molecular Medicine, KULeuven, Leuven, Belgium
| | - Joffré Verniers
- Switch Laboratory, VIB Center for Brain and Disease Research, Leuven, Belgium
- Department of Cellular and Molecular Medicine, KULeuven, Leuven, Belgium
| | - Rob van der Kant
- Switch Laboratory, VIB Center for Brain and Disease Research, Leuven, Belgium
- Department of Cellular and Molecular Medicine, KULeuven, Leuven, Belgium
| | - Matthias De Vleeschouwer
- Switch Laboratory, VIB Center for Brain and Disease Research, Leuven, Belgium
- Department of Cellular and Molecular Medicine, KULeuven, Leuven, Belgium
| | - Nuno Chicória
- Switch Laboratory, VIB Center for Brain and Disease Research, Leuven, Belgium
- Department of Cellular and Molecular Medicine, KULeuven, Leuven, Belgium
| | - Thomas Vanpoucke
- Switch Laboratory, VIB Center for Brain and Disease Research, Leuven, Belgium
- Department of Cellular and Molecular Medicine, KULeuven, Leuven, Belgium
| | - Rodrigo Gallardo
- Switch Laboratory, VIB Center for Brain and Disease Research, Leuven, Belgium
- Department of Cellular and Molecular Medicine, KULeuven, Leuven, Belgium
| | - Joost Schymkowitz
- Switch Laboratory, VIB Center for Brain and Disease Research, Leuven, Belgium
- Department of Cellular and Molecular Medicine, KULeuven, Leuven, Belgium
| | - Frederic Rousseau
- Switch Laboratory, VIB Center for Brain and Disease Research, Leuven, Belgium
- Department of Cellular and Molecular Medicine, KULeuven, Leuven, Belgium
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Chernova LS, Bogachev MI, Chasov VV, Vishnyakov IE, Kayumov AR. N- and C-terminal regions of the small heat shock protein IbpA from Acholeplasma laidlawii competitively govern its oligomerization pattern and chaperone-like activity. RSC Adv 2020; 10:8364-8376. [PMID: 35497866 PMCID: PMC9050003 DOI: 10.1039/c9ra10172a] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2019] [Accepted: 02/18/2020] [Indexed: 12/11/2022] Open
Abstract
Small heat shock proteins (sHSPs) are ubiquitous molecular chaperones preventing the irreversible denaturation of proteins. While in Escherichia coli two sHSPs IbpA and IbpB work in strong cooperation, the sole Mollicute with free-living ability Acholeplasma laidlawii carries a single gene encoding the sHSP protein AlIbpA. In vitro, independently of the temperature, AlIbpA forms a heterogeneous mixture of approximately 24-mer globules, fibrils and huge protein aggregates. The removal of either 12 or 25 N-terminal amino acids led to the formation of fibrils and enhanced the protein ability to prevent the temperature-induced aggregation of insulin, assuming the fibrillar form as an active protein. In turn, the deletion of the C-terminus or substitution of C-terminal LEL motif by SEP decreased the temperature stability of AlIbpA and eliminated its chaperone function completely, although the protein remained predominantly in a globular state. This suggests that the C-terminal LEL motif is necessary for the chaperon-like activity of AlIbpA and fibril formation. Double N- and C-terminal truncations abolished both the chaperone-like activity and huge oligomer formation. Since the globular form of sHSPs is considered as their inactive form, our data suggest that the N-terminus of AlIbpA is responsible for the huge globule (low-active form) formation and behaves as an intramolecular inhibitor of the fibrils (active form) formation and substrates binding. Taken together these data demonstrate non-trivial properties of AlIbpA, in which the competitive action of N- and C-termini governs the equilibrium between either fibrillar or globular structures representing a possible molecular mechanism of the AlIbpA activity regulation. The CTD provides fibrils (active form) formation. The NTD leads to globules formation and behaves as an intramolecular inhibitor of CTD. Their competition governs the equilibrium between either fibrills or globules regulating the AlIbpA activity.![]()
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Affiliation(s)
- Liliya S Chernova
- Kazan Federal University 18 Kremlevskaya street 420008 Kazan Russia +7-843-233-78-02.,Institute of Cytology, Russian Academy of Sciences 4 Tikhoretsky Avenue 194064 St-Petersburg Russia +7-812-297-03-28
| | - Mikhail I Bogachev
- St. Petersburg Electrotechnical University 5 Professor Popov street 197376 St. Petersburg Russia
| | - Vitaly V Chasov
- Kazan Federal University 18 Kremlevskaya street 420008 Kazan Russia +7-843-233-78-02
| | - Innokentii E Vishnyakov
- Institute of Cytology, Russian Academy of Sciences 4 Tikhoretsky Avenue 194064 St-Petersburg Russia +7-812-297-03-28.,Peter the Great St.Petersburg Polytechnic University 29 Polytechnicheskaya street 195251 St-Petersburg Russia
| | - Airat R Kayumov
- Kazan Federal University 18 Kremlevskaya street 420008 Kazan Russia +7-843-233-78-02.,Institute of Cytology, Russian Academy of Sciences 4 Tikhoretsky Avenue 194064 St-Petersburg Russia +7-812-297-03-28
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Fritsch TE, Siqueira FM, Schrank IS. Global analysis of sRNA target genes in Mycoplasma hyopneumoniae. BMC Genomics 2018; 19:767. [PMID: 30352553 PMCID: PMC6199787 DOI: 10.1186/s12864-018-5136-5] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2018] [Accepted: 10/01/2018] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Small RNAs (sRNAs) are noncoding molecules that regulate different cellular activities in several bacteria. The role of sRNAs in gene expression regulation is poorly characterized in the etiological agent of porcine enzootic pneumonia Mycoplasma hyopneumoniae. We performed a global analysis of the sRNAs, sRNA target genes and regulatory elements previously identified in their genome and analyzed the expression of some sRNAs and their target genes by quantitative RT-PCR (qPCR) in three different culture conditions. RESULTS Seven of the 145 sRNA target genes are organized as monocistronic genes (mCs) while the other 138 sRNA target genes are organized into transcriptional units (TU). The identification of transcriptional regulatory elements (promoter motif, DNA repeat sequence or intrinsic terminator) was verified in 116 of the 145 sRNA target genes. Moreover, the 29 sRNA target genes without regulatory elements revealed the presence of at least one regulatory element in the boundaries of the TU or in other internal genes of the TU. We verified that 16 sRNAs showed differential expression, seven in heat shock condition and 14 in oxidative stress condition. Analysis of the differential expression of the sRNA target genes showed that the tested sRNAs possibly regulate gene expression. The sRNA target genes were up- or down-regulated possibly in response to sRNA only under oxidative stress condition. Moreover, the sRNA target genes are involved in diverse processes of the cell, some of which could be linked to transcription processes and cell homeostasis. CONCLUSION Our results indicate that bacterial sRNAs could regulate a number of targets with various outcomes, and different correlations between the levels of sRNA transcripts and their target gene mRNAs were found, which suggest that the regulation of gene expression via sRNAs may play an important role in mycoplasma.
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Affiliation(s)
- Tiago Ebert Fritsch
- Centro de Biotecnologia, Programa de Pós-Graduação em Biologia Celular e Molecular, Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre, RS Brazil
| | - Franciele Maboni Siqueira
- Centro de Biotecnologia, Programa de Pós-Graduação em Biologia Celular e Molecular, Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre, RS Brazil
| | - Irene Silveira Schrank
- Centro de Biotecnologia, Programa de Pós-Graduação em Biologia Celular e Molecular, Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre, RS Brazil
- Departamento de Biologia Molecular e Biotecnologia – Centro de Biotecnologia, Universidade Federal do Rio Grande do Sul (UFRGS), Av. Bento Gonçalves 9500, P. 43421, C.P. 15005, CEP, Porto Alegre, RS 91501-970 Brazil
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Kayumov AR, Bogachev MI, Manuvera VA, Lazarev VN, Sabantsev AV, Artamonova TO, Borchsenius SN, Vishnyakov IE. Recombinant small heat shock protein from Acholeplasma laidlawii increases the Escherichia coli viability in thermal stress by selective protein rescue. Mol Biol 2017. [DOI: 10.1134/s0026893317010083] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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The Temperature-Dependent Selectivity of Potential Interaction Partners for the Small Heat Shock Protein IbpA from Acholeplasma laidlawii. BIONANOSCIENCE 2016. [DOI: 10.1007/s12668-016-0259-0] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Vishnyakov IE, Levitskii SA, Borchsenius SN. The effect of heat shock on phytopathogenic mycoplasma Acholeplasma laidlawii PG-8A. ACTA ACUST UNITED AC 2015. [DOI: 10.1134/s1990519x15020108] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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