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Ji S, Pan Y, Zhu L, Tan J, Tang S, Yang Q, Zhang Z, Lou D, Wang B. A novel 7α-hydroxysteroid dehydrogenase: Magnesium ion significantly enhances its activity and thermostability. Int J Biol Macromol 2021; 177:111-118. [PMID: 33592267 DOI: 10.1016/j.ijbiomac.2021.02.082] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2020] [Revised: 02/10/2021] [Accepted: 02/11/2021] [Indexed: 10/22/2022]
Abstract
7α-Hydroxysteroid dehydrogenase (7α-HSDH) plays an important role in the efficient biotransformation of taurochenodeoxycholic acid (TCDCA) to tauroursodeoxycholic acid (TUDCA). In this paper, a novel NADP(H)-dependent 7α-HSDH (named J-1-1) was discovered, heterologously expressed in Escherichia coli and biochemically characterized. J-1-1 exhibited high enzymatic activities. The specific activities of J-1-1 toward TCDCA, glycochenodeoxycholic acid (GCDCA) and ethyl benzoylacetate (EBA) were 188.3 ± 0.2, 217.6 ± 0.4, and 20.0 ± 0.2 U·mg-1, respectively, in 50 mM Glycine-NaOH, pH 10.5. Simultaneously, J-1-1 showed high thermostability; 73% of its activity maintained after heat treatment at 40 °C for 100 h. Particularly noteworthy is that magnesium ion could stabilize the structure of J-1-1, resulting in the enhancement of its enzymatic activity and thermostability. The enzymatic activity of J-1-1 increased 40-fold in the presence of 50 mM Mg2+, and T0.5 increased by approximately 6 °C. Furthermore, after heat treatment at 40 °C for 20 min, the control group only retained 52% of the residual enzyme activity, while the residual enzyme activity of the experimental group was still 77% of the J-1-1 enzyme activity with Mg2+ and without heat treatment. These properties of 7α-HSDH would be expected to contribute to more extensive applications in the biotransformation of related substrates.
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Affiliation(s)
- Shunlin Ji
- Key Laboratory of Biorheological Science and Technology, Ministry of Education, College of Bioengineering, Chongqing University, Chongqing 400030, PR China
| | - Yinping Pan
- Key Laboratory of Biorheological Science and Technology, Ministry of Education, College of Bioengineering, Chongqing University, Chongqing 400030, PR China
| | - Liancai Zhu
- Key Laboratory of Biorheological Science and Technology, Ministry of Education, College of Bioengineering, Chongqing University, Chongqing 400030, PR China; Modern Life Science Experiment Teaching Center, College of Bioengineering, Chongqing University, Chongqing 400030, PR China.
| | - Jun Tan
- Chongqing Key Laboratory of Medicinal Resources in the Three Gorges Reservoir Region, School of Biological & Chemical Engineering, Chongqing University of Education, Chongqing 400067, PR China
| | - Shijin Tang
- Key Laboratory of Biorheological Science and Technology, Ministry of Education, College of Bioengineering, Chongqing University, Chongqing 400030, PR China
| | - Qiong Yang
- Key Laboratory of Biorheological Science and Technology, Ministry of Education, College of Bioengineering, Chongqing University, Chongqing 400030, PR China; Chongqing Key Laboratory of Inorganic Special Functional Materials, Collaborative Innovation Center for Green Development in Wuling Mountain Areas, Yangtze Normal University, Chongqing 408100, PR China
| | - Zhi Zhang
- Key Laboratory of Biorheological Science and Technology, Ministry of Education, College of Bioengineering, Chongqing University, Chongqing 400030, PR China
| | - Deshuai Lou
- Chongqing Key Laboratory of Medicinal Resources in the Three Gorges Reservoir Region, School of Biological & Chemical Engineering, Chongqing University of Education, Chongqing 400067, PR China
| | - Bochu Wang
- Key Laboratory of Biorheological Science and Technology, Ministry of Education, College of Bioengineering, Chongqing University, Chongqing 400030, PR China.
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Eronina TB, Mikhaylova VV, Chebotareva NA, Shubin VV, Kleymenov SY, Kurganov BI. Effect of arginine on stability and aggregation of muscle glycogen phosphorylase b. Int J Biol Macromol 2020; 165:365-374. [PMID: 32961195 DOI: 10.1016/j.ijbiomac.2020.09.101] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2020] [Revised: 09/14/2020] [Accepted: 09/14/2020] [Indexed: 11/26/2022]
Abstract
Arginine (Arg) is frequently used in biotechnology and pharmaceutics to stabilize protein preparations. When using charged ions like Arg, it is necessary to take into account their contribution to the increase in ionic strength, in addition to the effect of Arg on particular processes occurring under the conditions of constancy of ionic strength. Here, we examined contribution of ionic strength (0.15 and 0.5 M) to the effects of Arg on denaturation, thermal inactivation and aggregation of skeletal muscle glycogen phosphorylase b (Phb). Dynamic light scattering, analytical ultracentrifugation, differential scanning calorimetry, circular dichroism and enzymatic activity assay were used to assess the effects of Arg at constant ionic strength compared with the effects of ionic strength alone. We found that high ionic strength did not affect the secondary structure of Phb, but changed conformation of the protein. Such a destabilization of the enzyme causes an increase in the initial rate of aggregation and inactivation of Phb thereby affecting its denaturation. Binding of Arg causes additional changes in the protein conformation, weakening the bonds between monomers in the dimer. This causes the dimer to dissociate into monomers, which rapidly aggregate. Thus, Arg acts on these processes much stronger than just ionic strength.
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Affiliation(s)
- Tatiana B Eronina
- Bach Institute of Biochemistry, Federal Research Centre "Fundamentals of Biotechnology", Russian Academy of Sciences, Leninsky pr. 33, Moscow 119071, Russia
| | - Valeriya V Mikhaylova
- Bach Institute of Biochemistry, Federal Research Centre "Fundamentals of Biotechnology", Russian Academy of Sciences, Leninsky pr. 33, Moscow 119071, Russia
| | - Natalia A Chebotareva
- Bach Institute of Biochemistry, Federal Research Centre "Fundamentals of Biotechnology", Russian Academy of Sciences, Leninsky pr. 33, Moscow 119071, Russia
| | - Vladimir V Shubin
- Bach Institute of Biochemistry, Federal Research Centre "Fundamentals of Biotechnology", Russian Academy of Sciences, Leninsky pr. 33, Moscow 119071, Russia
| | - Sergey Y Kleymenov
- Bach Institute of Biochemistry, Federal Research Centre "Fundamentals of Biotechnology", Russian Academy of Sciences, Leninsky pr. 33, Moscow 119071, Russia; Koltzov Institute of Developmental Biology, Russian Academy of Sciences, Vavilova 26, Moscow 119991, Russia
| | - Boris I Kurganov
- Bach Institute of Biochemistry, Federal Research Centre "Fundamentals of Biotechnology", Russian Academy of Sciences, Leninsky pr. 33, Moscow 119071, Russia.
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Effect of Arginine on Chaperone-Like Activity of HspB6 and Monomeric 14-3-3ζ. Int J Mol Sci 2020; 21:ijms21062039. [PMID: 32188159 PMCID: PMC7139691 DOI: 10.3390/ijms21062039] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2020] [Revised: 03/10/2020] [Accepted: 03/12/2020] [Indexed: 12/26/2022] Open
Abstract
The effect of protein chaperones HspB6 and the monomeric form of the protein 14-3-3ζ (14-3-3ζm) on a test system based on thermal aggregation of UV-irradiated glycogen phosphorylase b (UV-Phb) at 37 °C and a constant ionic strength (0.15 M) was studied using dynamic light scattering. A significant increase in the anti-aggregation activity of HspB6 and 14-3-3ζm was demonstrated in the presence of 0.1 M arginine (Arg). To compare the effects of these chaperones on UV-Phb aggregation, the values of initial stoichiometry of the chaperone-target protein complex (S0) were used. The analysis of the S0 values shows that in the presence of Arg fewer chaperone subunits are needed to completely prevent aggregation of the UV-Phb subunit. The changes in the structures of HspB6 and 14-3-3ζm induced by binding of Arg were evaluated by the fluorescence spectroscopy and differential scanning calorimetry. It was suggested that Arg caused conformational changes in chaperone molecules, which led to a decrease in the thermal stability of protein chaperones and their destabilization.
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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] [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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Eronina TB, Mikhaylova VV, Chebotareva NA, Shubin VV, Sluchanko NN, Kurganov BI. Comparative effects of trehalose and 2-hydroxypropyl-β-cyclodextrin on aggregation of UV-irradiated muscle glycogen phosphorylase b. Biochimie 2019; 165:196-205. [DOI: 10.1016/j.biochi.2019.08.006] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2019] [Accepted: 08/06/2019] [Indexed: 01/14/2023]
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