Improvement of stress tolerance and riboflavin production of Bacillus subtilis by introduction of heat shock proteins from thermophilic bacillus strains
Abstract In this study, stress tolerance devices consisting of heat shock protein (HSP) genes from thermophiles Geobacillus and Parageobacillus were introduced into riboflavin-producing strain Bacillus subtilis 446 to improve its stress tolerance and riboflavin production. The 12 HSP homologs were s...
Ausführliche Beschreibung
Autor*in: |
Wang, Junyang [verfasserIn] |
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Artikel |
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Sprache: |
Englisch |
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2019 |
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Anmerkung: |
© Springer-Verlag GmbH Germany, part of Springer Nature 2019 |
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Übergeordnetes Werk: |
Enthalten in: Applied microbiology and biotechnology - Springer Berlin Heidelberg, 1984, 103(2019), 11 vom: 09. Apr., Seite 4455-4465 |
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Übergeordnetes Werk: |
volume:103 ; year:2019 ; number:11 ; day:09 ; month:04 ; pages:4455-4465 |
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DOI / URN: |
10.1007/s00253-019-09788-x |
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Katalog-ID: |
OLC2050801157 |
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520 | |a Abstract In this study, stress tolerance devices consisting of heat shock protein (HSP) genes from thermophiles Geobacillus and Parageobacillus were introduced into riboflavin-producing strain Bacillus subtilis 446 to improve its stress tolerance and riboflavin production. The 12 HSP homologs were selected from 28 Geobacillus and Parageobacillus genomes according to their sequence clustering and phylogenetically analysis which represents the diversity of HSPs from thermophilic bacillus. The 12 HSP genes and 2 combinations of them (PtdnaK-PtdnaJ-PtgrpE and PtgroeL-PtgroeS) were heterologously expressed in B. subtilis 446 under the control of a strong constitutive promoter P43. Most of the 14 engineered strains showed increased cell density at 44 to 48 °C and less cell death at 50 °C compared with the control strains. Among them, strains B.s446-HSP20-3, B.s446-HSP20-2, and B.s446-PtDnaK-PtDnaJ-PtGrpE increased their cell densities over 25% at 44 to 48 °C. They also showed 5-, 4-, and 4-fold improved cell survivals after the 10-h heat shock treatment at 50 °C, respectively. These three strains also showed reduced cell death rates under osmotic stress of 10% NaCl, indicating that the introduction of HSPs improved not only the heat tolerance of B. subtilis 446 but also its osmotic tolerance. Fermentation of these three strains at higher temperatures of 39 and 43 °C showed 23–66% improved riboflavin titers, as well as 24-h shortened fermentation period. These results indicated that implanting HSPs from thermophiles to B. subtilis 446 would be an efficient approach to improve its stress tolerance and riboflavin production. | ||
650 | 4 | |a Molecular chaperones | |
650 | 4 | |a Heat tolerance | |
650 | 4 | |a Riboflavin production | |
650 | 4 | |a Osmotic tolerance | |
700 | 1 | |a Wang, Weishan |4 aut | |
700 | 1 | |a Wang, Huizhuan |4 aut | |
700 | 1 | |a Yuan, Fang |4 aut | |
700 | 1 | |a Xu, Zhen |4 aut | |
700 | 1 | |a Yang, Keqian |4 aut | |
700 | 1 | |a Li, Zilong |4 aut | |
700 | 1 | |a Chen, Yihua |4 aut | |
700 | 1 | |a Fan, Keqiang |0 (orcid)0000-0003-2420-1889 |4 aut | |
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10.1007/s00253-019-09788-x doi (DE-627)OLC2050801157 (DE-He213)s00253-019-09788-x-p DE-627 ger DE-627 rakwb eng 570 VZ 12 ssgn BIODIV DE-30 fid Wang, Junyang verfasserin aut Improvement of stress tolerance and riboflavin production of Bacillus subtilis by introduction of heat shock proteins from thermophilic bacillus strains 2019 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © Springer-Verlag GmbH Germany, part of Springer Nature 2019 Abstract In this study, stress tolerance devices consisting of heat shock protein (HSP) genes from thermophiles Geobacillus and Parageobacillus were introduced into riboflavin-producing strain Bacillus subtilis 446 to improve its stress tolerance and riboflavin production. The 12 HSP homologs were selected from 28 Geobacillus and Parageobacillus genomes according to their sequence clustering and phylogenetically analysis which represents the diversity of HSPs from thermophilic bacillus. The 12 HSP genes and 2 combinations of them (PtdnaK-PtdnaJ-PtgrpE and PtgroeL-PtgroeS) were heterologously expressed in B. subtilis 446 under the control of a strong constitutive promoter P43. Most of the 14 engineered strains showed increased cell density at 44 to 48 °C and less cell death at 50 °C compared with the control strains. Among them, strains B.s446-HSP20-3, B.s446-HSP20-2, and B.s446-PtDnaK-PtDnaJ-PtGrpE increased their cell densities over 25% at 44 to 48 °C. They also showed 5-, 4-, and 4-fold improved cell survivals after the 10-h heat shock treatment at 50 °C, respectively. These three strains also showed reduced cell death rates under osmotic stress of 10% NaCl, indicating that the introduction of HSPs improved not only the heat tolerance of B. subtilis 446 but also its osmotic tolerance. Fermentation of these three strains at higher temperatures of 39 and 43 °C showed 23–66% improved riboflavin titers, as well as 24-h shortened fermentation period. These results indicated that implanting HSPs from thermophiles to B. subtilis 446 would be an efficient approach to improve its stress tolerance and riboflavin production. Molecular chaperones Heat tolerance Riboflavin production Osmotic tolerance Wang, Weishan aut Wang, Huizhuan aut Yuan, Fang aut Xu, Zhen aut Yang, Keqian aut Li, Zilong aut Chen, Yihua aut Fan, Keqiang (orcid)0000-0003-2420-1889 aut Enthalten in Applied microbiology and biotechnology Springer Berlin Heidelberg, 1984 103(2019), 11 vom: 09. Apr., Seite 4455-4465 (DE-627)129942634 (DE-600)392453-1 (DE-576)015507750 0175-7598 nnns volume:103 year:2019 number:11 day:09 month:04 pages:4455-4465 https://doi.org/10.1007/s00253-019-09788-x lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC FID-BIODIV SSG-OLC-TEC SSG-OLC-CHE SSG-OLC-PHA SSG-OLC-DE-84 GBV_ILN_70 GBV_ILN_267 GBV_ILN_2018 GBV_ILN_4277 GBV_ILN_4305 AR 103 2019 11 09 04 4455-4465 |
spelling |
10.1007/s00253-019-09788-x doi (DE-627)OLC2050801157 (DE-He213)s00253-019-09788-x-p DE-627 ger DE-627 rakwb eng 570 VZ 12 ssgn BIODIV DE-30 fid Wang, Junyang verfasserin aut Improvement of stress tolerance and riboflavin production of Bacillus subtilis by introduction of heat shock proteins from thermophilic bacillus strains 2019 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © Springer-Verlag GmbH Germany, part of Springer Nature 2019 Abstract In this study, stress tolerance devices consisting of heat shock protein (HSP) genes from thermophiles Geobacillus and Parageobacillus were introduced into riboflavin-producing strain Bacillus subtilis 446 to improve its stress tolerance and riboflavin production. The 12 HSP homologs were selected from 28 Geobacillus and Parageobacillus genomes according to their sequence clustering and phylogenetically analysis which represents the diversity of HSPs from thermophilic bacillus. The 12 HSP genes and 2 combinations of them (PtdnaK-PtdnaJ-PtgrpE and PtgroeL-PtgroeS) were heterologously expressed in B. subtilis 446 under the control of a strong constitutive promoter P43. Most of the 14 engineered strains showed increased cell density at 44 to 48 °C and less cell death at 50 °C compared with the control strains. Among them, strains B.s446-HSP20-3, B.s446-HSP20-2, and B.s446-PtDnaK-PtDnaJ-PtGrpE increased their cell densities over 25% at 44 to 48 °C. They also showed 5-, 4-, and 4-fold improved cell survivals after the 10-h heat shock treatment at 50 °C, respectively. These three strains also showed reduced cell death rates under osmotic stress of 10% NaCl, indicating that the introduction of HSPs improved not only the heat tolerance of B. subtilis 446 but also its osmotic tolerance. Fermentation of these three strains at higher temperatures of 39 and 43 °C showed 23–66% improved riboflavin titers, as well as 24-h shortened fermentation period. These results indicated that implanting HSPs from thermophiles to B. subtilis 446 would be an efficient approach to improve its stress tolerance and riboflavin production. Molecular chaperones Heat tolerance Riboflavin production Osmotic tolerance Wang, Weishan aut Wang, Huizhuan aut Yuan, Fang aut Xu, Zhen aut Yang, Keqian aut Li, Zilong aut Chen, Yihua aut Fan, Keqiang (orcid)0000-0003-2420-1889 aut Enthalten in Applied microbiology and biotechnology Springer Berlin Heidelberg, 1984 103(2019), 11 vom: 09. Apr., Seite 4455-4465 (DE-627)129942634 (DE-600)392453-1 (DE-576)015507750 0175-7598 nnns volume:103 year:2019 number:11 day:09 month:04 pages:4455-4465 https://doi.org/10.1007/s00253-019-09788-x lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC FID-BIODIV SSG-OLC-TEC SSG-OLC-CHE SSG-OLC-PHA SSG-OLC-DE-84 GBV_ILN_70 GBV_ILN_267 GBV_ILN_2018 GBV_ILN_4277 GBV_ILN_4305 AR 103 2019 11 09 04 4455-4465 |
allfields_unstemmed |
10.1007/s00253-019-09788-x doi (DE-627)OLC2050801157 (DE-He213)s00253-019-09788-x-p DE-627 ger DE-627 rakwb eng 570 VZ 12 ssgn BIODIV DE-30 fid Wang, Junyang verfasserin aut Improvement of stress tolerance and riboflavin production of Bacillus subtilis by introduction of heat shock proteins from thermophilic bacillus strains 2019 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © Springer-Verlag GmbH Germany, part of Springer Nature 2019 Abstract In this study, stress tolerance devices consisting of heat shock protein (HSP) genes from thermophiles Geobacillus and Parageobacillus were introduced into riboflavin-producing strain Bacillus subtilis 446 to improve its stress tolerance and riboflavin production. The 12 HSP homologs were selected from 28 Geobacillus and Parageobacillus genomes according to their sequence clustering and phylogenetically analysis which represents the diversity of HSPs from thermophilic bacillus. The 12 HSP genes and 2 combinations of them (PtdnaK-PtdnaJ-PtgrpE and PtgroeL-PtgroeS) were heterologously expressed in B. subtilis 446 under the control of a strong constitutive promoter P43. Most of the 14 engineered strains showed increased cell density at 44 to 48 °C and less cell death at 50 °C compared with the control strains. Among them, strains B.s446-HSP20-3, B.s446-HSP20-2, and B.s446-PtDnaK-PtDnaJ-PtGrpE increased their cell densities over 25% at 44 to 48 °C. They also showed 5-, 4-, and 4-fold improved cell survivals after the 10-h heat shock treatment at 50 °C, respectively. These three strains also showed reduced cell death rates under osmotic stress of 10% NaCl, indicating that the introduction of HSPs improved not only the heat tolerance of B. subtilis 446 but also its osmotic tolerance. Fermentation of these three strains at higher temperatures of 39 and 43 °C showed 23–66% improved riboflavin titers, as well as 24-h shortened fermentation period. These results indicated that implanting HSPs from thermophiles to B. subtilis 446 would be an efficient approach to improve its stress tolerance and riboflavin production. Molecular chaperones Heat tolerance Riboflavin production Osmotic tolerance Wang, Weishan aut Wang, Huizhuan aut Yuan, Fang aut Xu, Zhen aut Yang, Keqian aut Li, Zilong aut Chen, Yihua aut Fan, Keqiang (orcid)0000-0003-2420-1889 aut Enthalten in Applied microbiology and biotechnology Springer Berlin Heidelberg, 1984 103(2019), 11 vom: 09. Apr., Seite 4455-4465 (DE-627)129942634 (DE-600)392453-1 (DE-576)015507750 0175-7598 nnns volume:103 year:2019 number:11 day:09 month:04 pages:4455-4465 https://doi.org/10.1007/s00253-019-09788-x lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC FID-BIODIV SSG-OLC-TEC SSG-OLC-CHE SSG-OLC-PHA SSG-OLC-DE-84 GBV_ILN_70 GBV_ILN_267 GBV_ILN_2018 GBV_ILN_4277 GBV_ILN_4305 AR 103 2019 11 09 04 4455-4465 |
allfieldsGer |
10.1007/s00253-019-09788-x doi (DE-627)OLC2050801157 (DE-He213)s00253-019-09788-x-p DE-627 ger DE-627 rakwb eng 570 VZ 12 ssgn BIODIV DE-30 fid Wang, Junyang verfasserin aut Improvement of stress tolerance and riboflavin production of Bacillus subtilis by introduction of heat shock proteins from thermophilic bacillus strains 2019 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © Springer-Verlag GmbH Germany, part of Springer Nature 2019 Abstract In this study, stress tolerance devices consisting of heat shock protein (HSP) genes from thermophiles Geobacillus and Parageobacillus were introduced into riboflavin-producing strain Bacillus subtilis 446 to improve its stress tolerance and riboflavin production. The 12 HSP homologs were selected from 28 Geobacillus and Parageobacillus genomes according to their sequence clustering and phylogenetically analysis which represents the diversity of HSPs from thermophilic bacillus. The 12 HSP genes and 2 combinations of them (PtdnaK-PtdnaJ-PtgrpE and PtgroeL-PtgroeS) were heterologously expressed in B. subtilis 446 under the control of a strong constitutive promoter P43. Most of the 14 engineered strains showed increased cell density at 44 to 48 °C and less cell death at 50 °C compared with the control strains. Among them, strains B.s446-HSP20-3, B.s446-HSP20-2, and B.s446-PtDnaK-PtDnaJ-PtGrpE increased their cell densities over 25% at 44 to 48 °C. They also showed 5-, 4-, and 4-fold improved cell survivals after the 10-h heat shock treatment at 50 °C, respectively. These three strains also showed reduced cell death rates under osmotic stress of 10% NaCl, indicating that the introduction of HSPs improved not only the heat tolerance of B. subtilis 446 but also its osmotic tolerance. Fermentation of these three strains at higher temperatures of 39 and 43 °C showed 23–66% improved riboflavin titers, as well as 24-h shortened fermentation period. These results indicated that implanting HSPs from thermophiles to B. subtilis 446 would be an efficient approach to improve its stress tolerance and riboflavin production. Molecular chaperones Heat tolerance Riboflavin production Osmotic tolerance Wang, Weishan aut Wang, Huizhuan aut Yuan, Fang aut Xu, Zhen aut Yang, Keqian aut Li, Zilong aut Chen, Yihua aut Fan, Keqiang (orcid)0000-0003-2420-1889 aut Enthalten in Applied microbiology and biotechnology Springer Berlin Heidelberg, 1984 103(2019), 11 vom: 09. Apr., Seite 4455-4465 (DE-627)129942634 (DE-600)392453-1 (DE-576)015507750 0175-7598 nnns volume:103 year:2019 number:11 day:09 month:04 pages:4455-4465 https://doi.org/10.1007/s00253-019-09788-x lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC FID-BIODIV SSG-OLC-TEC SSG-OLC-CHE SSG-OLC-PHA SSG-OLC-DE-84 GBV_ILN_70 GBV_ILN_267 GBV_ILN_2018 GBV_ILN_4277 GBV_ILN_4305 AR 103 2019 11 09 04 4455-4465 |
allfieldsSound |
10.1007/s00253-019-09788-x doi (DE-627)OLC2050801157 (DE-He213)s00253-019-09788-x-p DE-627 ger DE-627 rakwb eng 570 VZ 12 ssgn BIODIV DE-30 fid Wang, Junyang verfasserin aut Improvement of stress tolerance and riboflavin production of Bacillus subtilis by introduction of heat shock proteins from thermophilic bacillus strains 2019 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © Springer-Verlag GmbH Germany, part of Springer Nature 2019 Abstract In this study, stress tolerance devices consisting of heat shock protein (HSP) genes from thermophiles Geobacillus and Parageobacillus were introduced into riboflavin-producing strain Bacillus subtilis 446 to improve its stress tolerance and riboflavin production. The 12 HSP homologs were selected from 28 Geobacillus and Parageobacillus genomes according to their sequence clustering and phylogenetically analysis which represents the diversity of HSPs from thermophilic bacillus. The 12 HSP genes and 2 combinations of them (PtdnaK-PtdnaJ-PtgrpE and PtgroeL-PtgroeS) were heterologously expressed in B. subtilis 446 under the control of a strong constitutive promoter P43. Most of the 14 engineered strains showed increased cell density at 44 to 48 °C and less cell death at 50 °C compared with the control strains. Among them, strains B.s446-HSP20-3, B.s446-HSP20-2, and B.s446-PtDnaK-PtDnaJ-PtGrpE increased their cell densities over 25% at 44 to 48 °C. They also showed 5-, 4-, and 4-fold improved cell survivals after the 10-h heat shock treatment at 50 °C, respectively. These three strains also showed reduced cell death rates under osmotic stress of 10% NaCl, indicating that the introduction of HSPs improved not only the heat tolerance of B. subtilis 446 but also its osmotic tolerance. Fermentation of these three strains at higher temperatures of 39 and 43 °C showed 23–66% improved riboflavin titers, as well as 24-h shortened fermentation period. These results indicated that implanting HSPs from thermophiles to B. subtilis 446 would be an efficient approach to improve its stress tolerance and riboflavin production. Molecular chaperones Heat tolerance Riboflavin production Osmotic tolerance Wang, Weishan aut Wang, Huizhuan aut Yuan, Fang aut Xu, Zhen aut Yang, Keqian aut Li, Zilong aut Chen, Yihua aut Fan, Keqiang (orcid)0000-0003-2420-1889 aut Enthalten in Applied microbiology and biotechnology Springer Berlin Heidelberg, 1984 103(2019), 11 vom: 09. Apr., Seite 4455-4465 (DE-627)129942634 (DE-600)392453-1 (DE-576)015507750 0175-7598 nnns volume:103 year:2019 number:11 day:09 month:04 pages:4455-4465 https://doi.org/10.1007/s00253-019-09788-x lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC FID-BIODIV SSG-OLC-TEC SSG-OLC-CHE SSG-OLC-PHA SSG-OLC-DE-84 GBV_ILN_70 GBV_ILN_267 GBV_ILN_2018 GBV_ILN_4277 GBV_ILN_4305 AR 103 2019 11 09 04 4455-4465 |
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Enthalten in Applied microbiology and biotechnology 103(2019), 11 vom: 09. Apr., Seite 4455-4465 volume:103 year:2019 number:11 day:09 month:04 pages:4455-4465 |
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Enthalten in Applied microbiology and biotechnology 103(2019), 11 vom: 09. Apr., Seite 4455-4465 volume:103 year:2019 number:11 day:09 month:04 pages:4455-4465 |
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Wang, Junyang @@aut@@ Wang, Weishan @@aut@@ Wang, Huizhuan @@aut@@ Yuan, Fang @@aut@@ Xu, Zhen @@aut@@ Yang, Keqian @@aut@@ Li, Zilong @@aut@@ Chen, Yihua @@aut@@ Fan, Keqiang @@aut@@ |
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Wang, Junyang ddc 570 ssgn 12 fid BIODIV misc Molecular chaperones misc Heat tolerance misc Riboflavin production misc Osmotic tolerance Improvement of stress tolerance and riboflavin production of Bacillus subtilis by introduction of heat shock proteins from thermophilic bacillus strains |
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improvement of stress tolerance and riboflavin production of bacillus subtilis by introduction of heat shock proteins from thermophilic bacillus strains |
title_auth |
Improvement of stress tolerance and riboflavin production of Bacillus subtilis by introduction of heat shock proteins from thermophilic bacillus strains |
abstract |
Abstract In this study, stress tolerance devices consisting of heat shock protein (HSP) genes from thermophiles Geobacillus and Parageobacillus were introduced into riboflavin-producing strain Bacillus subtilis 446 to improve its stress tolerance and riboflavin production. The 12 HSP homologs were selected from 28 Geobacillus and Parageobacillus genomes according to their sequence clustering and phylogenetically analysis which represents the diversity of HSPs from thermophilic bacillus. The 12 HSP genes and 2 combinations of them (PtdnaK-PtdnaJ-PtgrpE and PtgroeL-PtgroeS) were heterologously expressed in B. subtilis 446 under the control of a strong constitutive promoter P43. Most of the 14 engineered strains showed increased cell density at 44 to 48 °C and less cell death at 50 °C compared with the control strains. Among them, strains B.s446-HSP20-3, B.s446-HSP20-2, and B.s446-PtDnaK-PtDnaJ-PtGrpE increased their cell densities over 25% at 44 to 48 °C. They also showed 5-, 4-, and 4-fold improved cell survivals after the 10-h heat shock treatment at 50 °C, respectively. These three strains also showed reduced cell death rates under osmotic stress of 10% NaCl, indicating that the introduction of HSPs improved not only the heat tolerance of B. subtilis 446 but also its osmotic tolerance. Fermentation of these three strains at higher temperatures of 39 and 43 °C showed 23–66% improved riboflavin titers, as well as 24-h shortened fermentation period. These results indicated that implanting HSPs from thermophiles to B. subtilis 446 would be an efficient approach to improve its stress tolerance and riboflavin production. © Springer-Verlag GmbH Germany, part of Springer Nature 2019 |
abstractGer |
Abstract In this study, stress tolerance devices consisting of heat shock protein (HSP) genes from thermophiles Geobacillus and Parageobacillus were introduced into riboflavin-producing strain Bacillus subtilis 446 to improve its stress tolerance and riboflavin production. The 12 HSP homologs were selected from 28 Geobacillus and Parageobacillus genomes according to their sequence clustering and phylogenetically analysis which represents the diversity of HSPs from thermophilic bacillus. The 12 HSP genes and 2 combinations of them (PtdnaK-PtdnaJ-PtgrpE and PtgroeL-PtgroeS) were heterologously expressed in B. subtilis 446 under the control of a strong constitutive promoter P43. Most of the 14 engineered strains showed increased cell density at 44 to 48 °C and less cell death at 50 °C compared with the control strains. Among them, strains B.s446-HSP20-3, B.s446-HSP20-2, and B.s446-PtDnaK-PtDnaJ-PtGrpE increased their cell densities over 25% at 44 to 48 °C. They also showed 5-, 4-, and 4-fold improved cell survivals after the 10-h heat shock treatment at 50 °C, respectively. These three strains also showed reduced cell death rates under osmotic stress of 10% NaCl, indicating that the introduction of HSPs improved not only the heat tolerance of B. subtilis 446 but also its osmotic tolerance. Fermentation of these three strains at higher temperatures of 39 and 43 °C showed 23–66% improved riboflavin titers, as well as 24-h shortened fermentation period. These results indicated that implanting HSPs from thermophiles to B. subtilis 446 would be an efficient approach to improve its stress tolerance and riboflavin production. © Springer-Verlag GmbH Germany, part of Springer Nature 2019 |
abstract_unstemmed |
Abstract In this study, stress tolerance devices consisting of heat shock protein (HSP) genes from thermophiles Geobacillus and Parageobacillus were introduced into riboflavin-producing strain Bacillus subtilis 446 to improve its stress tolerance and riboflavin production. The 12 HSP homologs were selected from 28 Geobacillus and Parageobacillus genomes according to their sequence clustering and phylogenetically analysis which represents the diversity of HSPs from thermophilic bacillus. The 12 HSP genes and 2 combinations of them (PtdnaK-PtdnaJ-PtgrpE and PtgroeL-PtgroeS) were heterologously expressed in B. subtilis 446 under the control of a strong constitutive promoter P43. Most of the 14 engineered strains showed increased cell density at 44 to 48 °C and less cell death at 50 °C compared with the control strains. Among them, strains B.s446-HSP20-3, B.s446-HSP20-2, and B.s446-PtDnaK-PtDnaJ-PtGrpE increased their cell densities over 25% at 44 to 48 °C. They also showed 5-, 4-, and 4-fold improved cell survivals after the 10-h heat shock treatment at 50 °C, respectively. These three strains also showed reduced cell death rates under osmotic stress of 10% NaCl, indicating that the introduction of HSPs improved not only the heat tolerance of B. subtilis 446 but also its osmotic tolerance. Fermentation of these three strains at higher temperatures of 39 and 43 °C showed 23–66% improved riboflavin titers, as well as 24-h shortened fermentation period. These results indicated that implanting HSPs from thermophiles to B. subtilis 446 would be an efficient approach to improve its stress tolerance and riboflavin production. © Springer-Verlag GmbH Germany, part of Springer Nature 2019 |
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title_short |
Improvement of stress tolerance and riboflavin production of Bacillus subtilis by introduction of heat shock proteins from thermophilic bacillus strains |
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