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Borzova VA, Eronina TB, Mikhaylova VV, Roman SG, Chernikov AM, Chebotareva NA. Effect of Chemical Chaperones on the Stability of Proteins during Heat- or Freeze-Thaw Stress. Int J Mol Sci 2023; 24:10298. [PMID: 37373447 DOI: 10.3390/ijms241210298] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2023] [Revised: 06/15/2023] [Accepted: 06/16/2023] [Indexed: 06/29/2023] Open
Abstract
The importance of studying the structural stability of proteins is determined by the structure-function relationship. Protein stability is influenced by many factors among which are freeze-thaw and thermal stresses. The effect of trehalose, betaine, sorbitol and 2-hydroxypropyl-β-cyclodextrin (HPCD) on the stability and aggregation of bovine liver glutamate dehydrogenase (GDH) upon heating at 50 °C or freeze-thawing was studied by dynamic light scattering, differential scanning calorimetry, analytical ultracentrifugation and circular dichroism spectroscopy. A freeze-thaw cycle resulted in the complete loss of the secondary and tertiary structure, and aggregation of GDH. All the cosolutes suppressed freeze-thaw- and heat-induced aggregation of GDH and increased the protein thermal stability. The effective concentrations of the cosolutes during freeze-thawing were lower than during heating. Sorbitol exhibited the highest anti-aggregation activity under freeze-thaw stress, whereas the most effective agents stabilizing the tertiary structure of GDH were HPCD and betaine. HPCD and trehalose were the most effective agents suppressing GDH thermal aggregation. All the chemical chaperones stabilized various soluble oligomeric forms of GDH against both types of stress. The data on GDH were compared with the effects of the same cosolutes on glycogen phosphorylase b during thermal and freeze-thaw-induced aggregation. This research can find further application in biotechnology and pharmaceutics.
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Affiliation(s)
- Vera A Borzova
- Bach Institute of Biochemistry, Federal Research Centre "Fundamentals of Biotechnology" of the Russian Academy of Sciences, Leninsky pr. 33, 119071 Moscow, Russia
| | - Tatiana B Eronina
- Bach Institute of Biochemistry, Federal Research Centre "Fundamentals of Biotechnology" of the Russian Academy of Sciences, Leninsky pr. 33, 119071 Moscow, Russia
| | - Valeriya V Mikhaylova
- Bach Institute of Biochemistry, Federal Research Centre "Fundamentals of Biotechnology" of the Russian Academy of Sciences, Leninsky pr. 33, 119071 Moscow, Russia
| | - Svetlana G Roman
- Bach Institute of Biochemistry, Federal Research Centre "Fundamentals of Biotechnology" of the Russian Academy of Sciences, Leninsky pr. 33, 119071 Moscow, Russia
| | - Andrey M Chernikov
- Bach Institute of Biochemistry, Federal Research Centre "Fundamentals of Biotechnology" of the Russian Academy of Sciences, Leninsky pr. 33, 119071 Moscow, Russia
| | - Natalia A Chebotareva
- Bach Institute of Biochemistry, Federal Research Centre "Fundamentals of Biotechnology" of the Russian Academy of Sciences, Leninsky pr. 33, 119071 Moscow, Russia
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Chebotareva NA, Eronina TB, Mikhaylova VV, Roman SG, Tugaeva KV, Kurganov BI. Effect of Trehalose on Oligomeric State and Anti-Aggregation Activity of αB-Crystallin. Biochemistry (Mosc) 2022; 87:121-130. [PMID: 35508907 DOI: 10.1134/s0006297922020043] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/20/2021] [Revised: 10/21/2021] [Accepted: 10/22/2021] [Indexed: 06/14/2023]
Abstract
αB-Crystallin (αB-Cr), one of the main crystalline lens proteins, along with other crystallins maintains lens transparency suppressing protein aggregation and thus preventing cataractogenesis. αB-Cr belongs to the class of molecular chaperones; being expressed in many tissues it has a dynamic quaternary structure, which is essential for its chaperone-like activity. Shift in the equilibrium between ensembles of oligomers of different size allows regulating the chaperone activity. Trehalose is known to inhibit protein aggregation in vivo and in vitro, and it is widely used in biotechnology. The results of studying the effect of trehalose on the chaperone-like activity of crystallins can serve as a basis for the design of drugs delaying cataractogenesis. We have studied the trehalose effect on the quaternary structure and anti-aggregation activity of αB-Cr using muscle glycogen phosphorylase b (Phb) as a target protein. According to the dynamic light scattering data, trehalose affects the nucleation stage of Phb thermal aggregation at 48°C, and an increase in the αB-Cr adsorption capacity (AC0) is the main effect of trehalose on the aggregation process in the presence of the protein chaperone (AC0 increases 1.5-fold in the presence of 66 mM trehalose). According to the sedimentation analysis data, trehalose stabilizes the dimeric form of Phb at the stages of denaturation and dissociation and enhances the interaction of αB-Cr with the target protein. Moreover, trehalose shifts the equilibrium between the αB-Cr oligomers towards the smaller forms. Thus, trehalose affects the quaternary structure of αB-Cr and increases its anti-aggregation activity at the nucleation stage.
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Affiliation(s)
- Natalia A Chebotareva
- Bach Institute of Biochemistry, Federal Research Centre "Fundamentals of Biotechnology" of the Russian Academy of Sciences, Moscow, 119071, Russia.
| | - Tatiana B Eronina
- Bach Institute of Biochemistry, Federal Research Centre "Fundamentals of Biotechnology" of the Russian Academy of Sciences, Moscow, 119071, Russia
| | - Valeriya V Mikhaylova
- Bach Institute of Biochemistry, Federal Research Centre "Fundamentals of Biotechnology" of the Russian Academy of Sciences, Moscow, 119071, Russia
| | - Svetlana G Roman
- Bach Institute of Biochemistry, Federal Research Centre "Fundamentals of Biotechnology" of the Russian Academy of Sciences, Moscow, 119071, Russia
| | - Kristina V Tugaeva
- Bach Institute of Biochemistry, Federal Research Centre "Fundamentals of Biotechnology" of the Russian Academy of Sciences, Moscow, 119071, Russia
| | - Boris I Kurganov
- Bach Institute of Biochemistry, Federal Research Centre "Fundamentals of Biotechnology" of the Russian Academy of Sciences, Moscow, 119071, Russia
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Chebotareva NA, Roman SG, Borzova VA, Eronina TB, Mikhaylova VV, Kurganov BI. Chaperone-Like Activity of HSPB5: The Effects of Quaternary Structure Dynamics and Crowding. Int J Mol Sci 2020; 21:ijms21144940. [PMID: 32668633 PMCID: PMC7404038 DOI: 10.3390/ijms21144940] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2020] [Revised: 07/04/2020] [Accepted: 07/10/2020] [Indexed: 11/16/2022] Open
Abstract
Small heat-shock proteins (sHSPs) are ATP-independent molecular chaperones that interact with partially unfolded proteins, preventing their aberrant aggregation, thereby exhibiting a chaperone-like activity. Dynamics of the quaternary structure plays an important role in the chaperone-like activity of sHSPs. However, relationship between the dynamic structure of sHSPs and their chaperone-like activity remains insufficiently characterized. Many factors (temperature, ions, a target protein, crowding etc.) affect the structure and activity of sHSPs. The least studied is an effect of crowding on sHSPs activity. In this work the chaperone-like activity of HSPB5 was quantitatively characterized by dynamic light scattering using two test systems, namely test systems based on heat-induced aggregation of muscle glycogen phosphorylase b (Phb) at 48 °C and dithiothreitol-induced aggregation of α-lactalbumin at 37 °C. Analytical ultracentrifugation was used to control the oligomeric state of HSPB5 and target proteins. The possible anti-aggregation functioning of suboligomeric forms of HSPB5 is discussed. The effect of crowding on HSPB5 anti-aggregation activity was characterized using Phb as a target protein. The duration of the nucleation stage was shown to decrease with simultaneous increase in the relative rate of aggregation of Phb in the presence of HSPB5 under crowded conditions. Crowding may subtly modulate sHSPs activity.
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Chebotareva NA, Eronina TB, Roman SG, Mikhaylova VV, Kleymenov SY, Kurganov BI. Kinetic regime of Ca 2+ and Mg 2+-induced aggregation of phosphorylase kinase at 40 °C. Int J Biol Macromol 2019; 138:181-187. [PMID: 31279057 DOI: 10.1016/j.ijbiomac.2019.06.240] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2019] [Revised: 06/28/2019] [Accepted: 06/29/2019] [Indexed: 10/26/2022]
Abstract
Many functions of phosphorylase kinase (PhK) are regulated by Ca2+ and Mg2+ ions. Ca2+ and Mg2+ ions stimulate activity of PhK, induce the changes in the tertiary and quaternary structure of the hexadecameric enzyme molecule, provoke association/aggregation of PhK molecules, enhance PhK binding to glycogen. To establish the kinetic regime of Ca2+ and Mg2+-induced aggregation of PhK from rabbit skeletal muscles at 40 °C, in the present work the kinetics of aggregation was studied at various protein concentrations using the dynamic light scattering. The proposed mechanism of aggregation involves the stage of unfolding of the protein molecule with retention of the integrity of its oligomeric structure, the nucleation stage and stages of the growth of protein aggregates. The initial rate of the aggregation process at the stage of aggregate growth depends linearly on the protein concentration. This means that the order of aggregation with respect to the protein is equal to unity and the aggregation rate is limited by the rate of protein unfolding. The rate constant of the first order characterizing the stage of protein unfolding was found to be equal to 0.071 min-1 (40 mM Hepes, pH 6.8, 100 mM NaCl, 0.1 mM Ca2+, 10 mM Mg2+).
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Affiliation(s)
- Natalia A Chebotareva
- Laboratory of Structural Biochemistry of Proteins, Bach Institute of Biochemistry, Federal Research Centre "Fundamentals of Biotechnology" of the Russian Academy of Sciences, Leninsky pr. 33, Moscow 119071, Russia
| | - Tatiana B Eronina
- Laboratory of Structural Biochemistry of Proteins, Bach Institute of Biochemistry, Federal Research Centre "Fundamentals of Biotechnology" of the Russian Academy of Sciences, Leninsky pr. 33, Moscow 119071, Russia
| | - Svetlana G Roman
- Laboratory of Structural Biochemistry of Proteins, Bach Institute of Biochemistry, Federal Research Centre "Fundamentals of Biotechnology" of the Russian Academy of Sciences, Leninsky pr. 33, Moscow 119071, Russia
| | - Valeriya V Mikhaylova
- Laboratory of Structural Biochemistry of Proteins, Bach Institute of Biochemistry, Federal Research Centre "Fundamentals of Biotechnology" of the Russian Academy of Sciences, Leninsky pr. 33, Moscow 119071, Russia
| | - Sergey Yu Kleymenov
- Laboratory of Structural Biochemistry of Proteins, Bach Institute of Biochemistry, Federal Research Centre "Fundamentals of Biotechnology" of the Russian Academy of Sciences, Leninsky pr. 33, Moscow 119071, Russia; Koltsov Institute of Developmental Biology, Russian Academy of Sciences, Moscow, Russia
| | - Boris I Kurganov
- Laboratory of Structural Biochemistry of Proteins, Bach Institute of Biochemistry, Federal Research Centre "Fundamentals of Biotechnology" of the Russian Academy of Sciences, Leninsky pr. 33, Moscow 119071, Russia.
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Chebotareva NA, Eronina TB, Roman SG, Mikhaylova VV, Sluchanko NN, Gusev NB, Kurganov BI. Oligomeric state of αB-crystallin under crowded conditions. Biochem Biophys Res Commun 2018; 508:1101-1105. [PMID: 30551876 DOI: 10.1016/j.bbrc.2018.12.015] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2018] [Accepted: 12/03/2018] [Indexed: 12/12/2022]
Abstract
Small heat shock proteins (sHsps) are molecular chaperones preventing protein aggregation. Dynamics of quaternary structure plays an important role in the chaperone-like activity of sHsps. However, an interrelation between the oligomeric state and chaperone-like activity of sHsps remains insufficiently characterized. Most of the accumulated data were obtained in dilute protein solutions, leaving the question of the oligomeric state of sHsps in crowded intracellular media largely unanswered. Here, we analyzed the effect of crowding on the oligomeric state of αB-crystallin (αB-Cr) using analytical ultracentrifugation. Marked increase in the sedimentation coefficient of αB-Cr was observed in the presence of polyethylene glycol (PEG), polyvinylpyrrolidone (PVP) and trimethylamine N-oxide (TMAO) at 48 °C. An especially pronounced effect was detected for the PEG and TMAO mixture, where the sedimentation coefficient (s20,w) of αB-Cr increased from 10.7 S in dilute solution up to 40.7 S in the presence of crowding agents. In the PEG + TMAO mixture, addition of model protein substrate (muscle glycogen phosphorylase b) induced dissociation of large αB-Cr oligomers and formation of complexes with smaller sedimentation coefficients, supporting the idea that, under crowding conditions, protein substrates can promote dissociation of large αB-Cr oligomers.
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Affiliation(s)
- Natalia A Chebotareva
- Laboratory of Structural Biochemistry of Proteins, Bach Institute of Biochemistry, Federal Research Centre "Fundamentals of Biotechnology" of the Russian Academy of Sciences, Leninsky pr. 33, Moscow, 119071, Russia.
| | - Tatiana B Eronina
- Laboratory of Structural Biochemistry of Proteins, Bach Institute of Biochemistry, Federal Research Centre "Fundamentals of Biotechnology" of the Russian Academy of Sciences, Leninsky pr. 33, Moscow, 119071, Russia
| | - Svetlana G Roman
- Laboratory of Structural Biochemistry of Proteins, Bach Institute of Biochemistry, Federal Research Centre "Fundamentals of Biotechnology" of the Russian Academy of Sciences, Leninsky pr. 33, Moscow, 119071, Russia
| | - Valeriya V Mikhaylova
- Laboratory of Structural Biochemistry of Proteins, Bach Institute of Biochemistry, Federal Research Centre "Fundamentals of Biotechnology" of the Russian Academy of Sciences, Leninsky pr. 33, Moscow, 119071, Russia
| | - Nikolai N Sluchanko
- Laboratory of Structural Biochemistry of Proteins, Bach Institute of Biochemistry, Federal Research Centre "Fundamentals of Biotechnology" of the Russian Academy of Sciences, Leninsky pr. 33, Moscow, 119071, Russia; Department of Biophysics, School of Biology, M.V. Lomonosov Moscow State University, Lenin Hills 1, Building 24, Moscow, 119991, Russia
| | - Nikolai B Gusev
- Department of Biochemistry, School of Biology, M.V. Lomonosov Moscow State University, Lenin Hills 1, Building 12, Moscow, 119991, Russia
| | - Boris I Kurganov
- Laboratory of Structural Biochemistry of Proteins, Bach Institute of Biochemistry, Federal Research Centre "Fundamentals of Biotechnology" of the Russian Academy of Sciences, Leninsky pr. 33, Moscow, 119071, Russia
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Chebotareva NA, Roman SG, Kurganov BI. Dissociative mechanism for irreversible thermal denaturation of oligomeric proteins. Biophys Rev 2016; 8:397-407. [PMID: 28510015 PMCID: PMC5418479 DOI: 10.1007/s12551-016-0220-z] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2016] [Accepted: 09/13/2016] [Indexed: 01/09/2023] Open
Abstract
Protein stability is a fundamental characteristic essential for understanding conformational transformations of the proteins in the cell. When using protein preparations in biotechnology and biomedicine, the problem of protein stability is of great importance. The kinetics of denaturation of oligomeric proteins may have characteristic properties determined by the quaternary structure. The kinetic schemes of denaturation can include the multiple stages of conformational transitions in the protein oligomer and stages of reversible dissociation of the oligomer. In this case, the shape of the kinetic curve of denaturation or the shape of the melting curve registered by differential scanning calorimetry can vary with varying the protein concentration. The experimental data illustrating dissociative mechanism for irreversible thermal denaturation of oligomeric proteins have been summarized in the present review. The use of test systems based on thermal aggregation of oligomeric proteins for screening of agents possessing anti-aggregation activity is discussed.
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Affiliation(s)
- Natalia A Chebotareva
- Bach Institute of Biochemistry, Research Center of Biotechnology of the Russian Academy of Sciences, Leninsky pr. 33, Moscow, 119071, Russia.
| | - Svetlana G Roman
- Bach Institute of Biochemistry, Research Center of Biotechnology of the Russian Academy of Sciences, Leninsky pr. 33, Moscow, 119071, Russia
| | - Boris I Kurganov
- Bach Institute of Biochemistry, Research Center of Biotechnology of the Russian Academy of Sciences, Leninsky pr. 33, Moscow, 119071, Russia
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Roman SG, Chebotareva NA, Kurganov BI. Anti-aggregation activity of small heat shock proteins under crowded conditions. Int J Biol Macromol 2016; 100:97-103. [PMID: 27234495 DOI: 10.1016/j.ijbiomac.2016.05.080] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2015] [Revised: 03/23/2016] [Accepted: 05/22/2016] [Indexed: 10/21/2022]
Abstract
It is becoming evident that small heat shock proteins (sHsps) are important players of protein homeostasis system. Their ability to bind misfolded proteins may play a crucial role in preventing protein aggregation in cells. The remarkable structural plasticity of sHsps is considered to underlie the mechanism of their activity. However, all our knowledge of the anti-aggregation functioning of sHsps is based on data obtained in vitro in media greatly different from the cellular highly crowded milieu. The present review highlights available data on the effect of crowding on the anti-aggregation activity of sHsps. There is some evidence that crowding affects conformation and dynamics of sHsps oligomers as well as their anti-aggregation properties. Crowding stimulates association of sHsp-client protein complexes into large-sized aggregates thus diminishing the apparent anti-aggregation activity of sHsps. Nevertheless, it is also shown that complexes between suboligomers (dissociated forms) of sHsps and client proteins may be stabilized and exist for longer period of time under crowded conditions. Moreover, crowding may retard the initial stages of aggregation which correspond to the formation of sHsp-containing nuclei and their clusters. Thus, dissociation of sHsps into suboligomers appears to be an important feature for the anti-aggregation activity of sHsps in crowded media.
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Affiliation(s)
- Svetlana G Roman
- Bach Institute of Biochemistry, Research Center of Biotechnology of the Russian Academy of Sciences, Leninsky pr. 33, Moscow 119071, Russia.
| | - Natalia A Chebotareva
- Bach Institute of Biochemistry, Research Center of Biotechnology of the Russian Academy of Sciences, Leninsky pr. 33, Moscow 119071, Russia
| | - Boris I Kurganov
- Bach Institute of Biochemistry, Research Center of Biotechnology of the Russian Academy of Sciences, Leninsky pr. 33, Moscow 119071, Russia
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Sluchanko NN, Roman SG, Chebotareva NA, Gusev NB. Chaperone-like activity of monomeric human 14-3-3ζ on different protein substrates. Arch Biochem Biophys 2014; 549:32-9. [PMID: 24681339 DOI: 10.1016/j.abb.2014.03.008] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2014] [Revised: 03/05/2014] [Accepted: 03/18/2014] [Indexed: 12/28/2022]
Abstract
Members of the 14-3-3 protein family interact with hundreds of different, predominantly phosphorylated, proteins. 14-3-3 dimers are prevalent but exist at the equilibrium with the monomers. Our previous studies using the engineered monomeric 14-3-3ζ (14-3-3ζm) showed that 14-3-3ζ monomer retained binding activity towards selected phosphorylated partners and, in addition, it prevented heat-induced aggregation of myosin subfragment 1. Since the chaperone-like activity of 14-3-3 monomers has been insufficiently studied, here we have analyzed the effect of 14-3-3ζm on the aggregation of different model proteins. We found that 14-3-3ζm demonstrated considerable chaperone-like activity by inhibiting the DTT-induced aggregation of insulin and thermally-induced aggregation of alcohol dehydrogenase and phosphorylase kinase. Importantly, the anti-aggregating activity of 14-3-3ζm was concentration-dependent and overall, was more pronounced than that of its dimeric counterpart. In some cases, the chaperone-like effect of 14-3-3ζm was comparable, or even higher, than that of the small heat shock proteins, HspB6 and HspB5. We suggest that 14-3-3s not only can bind and regulate the activity of multiple phosphoproteins, but also possess moonlighting chaperone-like activity, which is especially pronounced in the case of monomeric forms of 14-3-3 which can be present under certain stress conditions.
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Affiliation(s)
- Nikolai N Sluchanko
- A. N. Bach Institute of Biochemistry, Russian Academy of Sciences, Leninsky Prospect 33, Moscow 119071, Russian Federation.
| | - Svetlana G Roman
- A. N. Bach Institute of Biochemistry, Russian Academy of Sciences, Leninsky Prospect 33, Moscow 119071, Russian Federation
| | - Natalia A Chebotareva
- A. N. Bach Institute of Biochemistry, Russian Academy of Sciences, Leninsky Prospect 33, Moscow 119071, Russian Federation
| | - Nikolai B Gusev
- Department of Biochemistry, School of Biology, Moscow State University, Moscow 119991, Russian Federation
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Eronina TB, Chebotareva NA, Roman SG, Kleymenov SY, Makeeva VF, Poliansky NB, Muranov KO, Kurganov BI. Thermal denaturation and aggregation of apoform of glycogen phosphorylaseb. Effect of crowding agents and chaperones. Biopolymers 2014; 101:504-16. [DOI: 10.1002/bip.22410] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2013] [Accepted: 09/13/2013] [Indexed: 12/16/2022]
Affiliation(s)
- Tatyana B. Eronina
- Department of Structural Biochemistry of Proteins; A.N. Bach Institute of Biochemistry; Russian Academy of Sciences, Leninsky Prospect 33 Moscow 119071 Russia
| | - Natalia A. Chebotareva
- Department of Structural Biochemistry of Proteins; A.N. Bach Institute of Biochemistry; Russian Academy of Sciences, Leninsky Prospect 33 Moscow 119071 Russia
| | - Svetlana G. Roman
- Department of Structural Biochemistry of Proteins; A.N. Bach Institute of Biochemistry; Russian Academy of Sciences, Leninsky Prospect 33 Moscow 119071 Russia
| | - Sergey Yu. Kleymenov
- Koltsov's Institute of Developmental Biology; Russian Academy of Sciences, Vavilov st 26 Moscow 119334 Russia
| | - Valentina F. Makeeva
- Department of Structural Biochemistry of Proteins; A.N. Bach Institute of Biochemistry; Russian Academy of Sciences, Leninsky Prospect 33 Moscow 119071 Russia
| | - Nikolay B. Poliansky
- Emanuel Institute of Biochemical Physics; Russian Academy of Sciences, Kosygin st. 4 Moscow 119991 Russia
| | - Konstantin O. Muranov
- Emanuel Institute of Biochemical Physics; Russian Academy of Sciences, Kosygin st. 4 Moscow 119991 Russia
| | - Boris I. Kurganov
- Department of Structural Biochemistry of Proteins; A.N. Bach Institute of Biochemistry; Russian Academy of Sciences, Leninsky Prospect 33 Moscow 119071 Russia
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Roman SG, Chebotareva NA, Kurganov BI. Concentration dependence of chaperone-like activities of α-crystallin, αB-crystallin and proline. Int J Biol Macromol 2012; 50:1341-5. [DOI: 10.1016/j.ijbiomac.2012.03.015] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2011] [Revised: 03/16/2012] [Accepted: 03/22/2012] [Indexed: 01/03/2023]
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Roman SG, Chebotareva NA, Eronina TB, Kleymenov SY, Makeeva VF, Poliansky NB, Muranov KO, Kurganov BI. Does the Crowded Cell-like Environment Reduce the Chaperone-like Activity of α-Crystallin? Biochemistry 2011; 50:10607-23. [DOI: 10.1021/bi201030y] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Svetlana G. Roman
- Bach Institute of Biochemistry, Russian Academy of Sciences, Leninsky pr. 33, Moscow 119071, Russia
- Department of Physics, Moscow State University, Leninskie Gory, Moscow 119992, Russia
| | - Natalia A. Chebotareva
- Bach Institute of Biochemistry, Russian Academy of Sciences, Leninsky pr. 33, Moscow 119071, Russia
| | - Tatyana B. Eronina
- Bach Institute of Biochemistry, Russian Academy of Sciences, Leninsky pr. 33, Moscow 119071, Russia
| | - Sergey Yu. Kleymenov
- Bach Institute of Biochemistry, Russian Academy of Sciences, Leninsky pr. 33, Moscow 119071, Russia
- Kol’tsov Institute of Developmental
Biology, Russian Academy of Sciences, Vavilova
st. 26, Moscow 119991, Russia
| | - Valentina F. Makeeva
- Bach Institute of Biochemistry, Russian Academy of Sciences, Leninsky pr. 33, Moscow 119071, Russia
| | - Nikolay B. Poliansky
- Emanuel Institute of Biochemical Physics, Russian Academy of Sciences, Kosygin st. 4, Moscow 119991, Russia
| | - Konstantin O. Muranov
- Emanuel Institute of Biochemical Physics, Russian Academy of Sciences, Kosygin st. 4, Moscow 119991, Russia
| | - Boris I. Kurganov
- Bach Institute of Biochemistry, Russian Academy of Sciences, Leninsky pr. 33, Moscow 119071, Russia
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Eronina TB, Chebotareva NA, Kleymenov SY, Roman SG, Makeeva VF, Kurganov BI. Effect of 2-hydroxypropyl-β-cyclodextrin on thermal stability and aggregation of glycogen phosphorylase b from rabbit skeletal muscle. Biopolymers 2010; 93:986-93. [PMID: 20540152 DOI: 10.1002/bip.21508] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
The study of the kinetics of thermal aggregation of glycogen phosphorylase b (Phb) from rabbit skeletal muscles by dynamic light scattering at 48°C showed that 2-hydroxypropyl-β-cyclodextrin (HP-β-CD) accelerated the aggregation process and induced the formation of the larger protein aggregates. The reason of the accelerating effect of HP-β-CD is destabilization of the protein molecule under action of HP-β-CD. This conclusion was supported by the data on differential scanning calorimetry and the kinetic data on thermal inactivation of Phb. It is assumed that destabilization of the Phb molecule is due to preferential binding of HP-β-CD to intermediates of protein unfolding in comparison with the original native state. The conclusion regarding the ability of the native Phb for binding of HP-β-CD was substantiated by the data on the enzyme inhibition by HP-β-CD. © 2010 Wiley Periodicals, Inc. Biopolymers 93: 986-993, 2010.
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Affiliation(s)
- Tatyana B Eronina
- Department of Structural Biochemistry of Proteins, A.N. Bach Institute of Biochemistry, Russian Academy of Sciences, Leninsky Prospect 33, Moscow 119071, Russia.
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Richards FO, Klein RE, Gonzáles-Peralta C, Flores RZ, Roman SG, Ramírez JC, Flores GZ. Knowledge, attitudes and practices during a community-level ivermectin distribution campaign in Guatemala. Health Policy Plan 1995; 10:404-14. [PMID: 10154362 DOI: 10.1093/heapol/10.4.404] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Community acceptance and participation are essential for the success of mass ivermectin chemotherapy programmes for onchocerciasis (river blindness). To explore the local understanding of the purpose of ivermectin and willingness to continue taking the drug, we performed questionnaire surveys in four communities with hyperendemic onchocerciasis after each of three ivermectin treatment rounds. More than 100 respondents participated in each KAP survey, representing the heads of 30% of the households in each community. The respondents rarely stated that the goal of the ivermectin treatment programme was to prevent visual loss. Instead, they said they were taking the drug for their general well-being, to cure the onchocercal nodule (filaria), or to cure the microfilaria, a term newly introduced by agents of the treatment programme. The principal reason identified for refusal to take ivermectin was anxiety about drug-related adverse reactions, and there were marked differences between communities in acceptance of treatment. In one community over 50% of residents initially refused to take ivermectin, although participation rates improved somewhat after programmatic adjustments. We recommend that ivermectin distribution programmes establish surveillance activities to detect where acceptance is poor, so that timely and community-specific adjustments may be devised to improve participation.
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Affiliation(s)
- F O Richards
- Centers for Disease Control and Prevention, Atlanta, GA 30341, USA
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