Synergistic improvement of PQQ-dependent D-sorbitol dehydrogenase activity from
6-(N-hydroxyethyl) amino-6-deoxy-l-sorbofuranose (6NSL) is the direct precursor of miglitol for diabetes therapy. The regio- and stereo-selective dehydrogenation offered by the membrane-bound d-sorbitol dehydrogenase (mSLDH) from Gluconobacter oxydans provides an elegant enzymatic method for 6NSL pr...
Ausführliche Beschreibung
Gespeichert in:
| Autor*in: |
Ke, Xia [verfasserIn] Pan-Hong, Yu [verfasserIn] Hu, Zhong-Ce [verfasserIn] Chen, Liang [verfasserIn] Sun, Xin-Qiang [verfasserIn] Zheng, Yu-Guo [verfasserIn] |
|---|
| Format: |
E-Artikel |
|---|---|
| Sprache: |
Englisch |
| Erschienen: |
2019 |
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| Schlagwörter: |
|---|
| Übergeordnetes Werk: |
Enthalten in: Journal of biotechnology - Amsterdam [u.a.] : Elsevier Science, 1984, 300, Seite 55-62 |
|---|---|
| Übergeordnetes Werk: |
volume:300 ; pages:55-62 |
| DOI / URN: |
10.1016/j.jbiotec.2019.05.007 |
|---|
| Katalog-ID: |
ELV002414627 |
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| 520 | |a 6-(N-hydroxyethyl) amino-6-deoxy-l-sorbofuranose (6NSL) is the direct precursor of miglitol for diabetes therapy. The regio- and stereo-selective dehydrogenation offered by the membrane-bound d-sorbitol dehydrogenase (mSLDH) from Gluconobacter oxydans provides an elegant enzymatic method for 6NSL production. In this study, two subunits sldA and sldB of mSLDH were introduced into G. oxydans ZJB-605, and the specific enzyme activity of mSLDH towards NHEG was enhanced by 2.15-fold. However, the endogenous PQQ level was dramatically reduced in the recombinant strain and became a bottleneck to support the holo-enzyme activity. A combined supplementation of four amino acids (Glu, Ile, Ser, Arg) involved in biosynthesis of PQQ in conventional media effectively increased extracellular accumulation of PQQ by 1.49-fold, which further enhanced mSLDH activity by 1.33-fold. The synergic improvement of mSLDH activity provided in this study supports the superior high dehydrogenate activity towards substrate N-2-hydroxyethyl-glucamine, 184.28 g·L−1 of 6NSL was produced after a repeated bioconversion process catalyzed by the resting cells of G. oxydans/pBB-sldAB, all of which presenting a great potential of their industrial application in 6NSL biosynthesis. | ||
| 650 | 4 | |a Membrane-bound D-sorbitol dehydrogenase | |
| 650 | 4 | |a Pyrroloquinoline quinine | |
| 650 | 4 | |a Miglitol | |
| 700 | 1 | |a Pan-Hong, Yu |e verfasserin |4 aut | |
| 700 | 1 | |a Hu, Zhong-Ce |e verfasserin |4 aut | |
| 700 | 1 | |a Chen, Liang |e verfasserin |4 aut | |
| 700 | 1 | |a Sun, Xin-Qiang |e verfasserin |4 aut | |
| 700 | 1 | |a Zheng, Yu-Guo |e verfasserin |4 aut | |
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10.1016/j.jbiotec.2019.05.007 doi (DE-627)ELV002414627 (ELSEVIER)S0168-1656(19)30163-4 DE-627 ger DE-627 rda eng 540 DE-600 58.30 bkl Ke, Xia verfasserin aut Synergistic improvement of PQQ-dependent D-sorbitol dehydrogenase activity from 2019 nicht spezifiziert zzz rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier 6-(N-hydroxyethyl) amino-6-deoxy-l-sorbofuranose (6NSL) is the direct precursor of miglitol for diabetes therapy. The regio- and stereo-selective dehydrogenation offered by the membrane-bound d-sorbitol dehydrogenase (mSLDH) from Gluconobacter oxydans provides an elegant enzymatic method for 6NSL production. In this study, two subunits sldA and sldB of mSLDH were introduced into G. oxydans ZJB-605, and the specific enzyme activity of mSLDH towards NHEG was enhanced by 2.15-fold. However, the endogenous PQQ level was dramatically reduced in the recombinant strain and became a bottleneck to support the holo-enzyme activity. A combined supplementation of four amino acids (Glu, Ile, Ser, Arg) involved in biosynthesis of PQQ in conventional media effectively increased extracellular accumulation of PQQ by 1.49-fold, which further enhanced mSLDH activity by 1.33-fold. The synergic improvement of mSLDH activity provided in this study supports the superior high dehydrogenate activity towards substrate N-2-hydroxyethyl-glucamine, 184.28 g·L−1 of 6NSL was produced after a repeated bioconversion process catalyzed by the resting cells of G. oxydans/pBB-sldAB, all of which presenting a great potential of their industrial application in 6NSL biosynthesis. Membrane-bound D-sorbitol dehydrogenase Pyrroloquinoline quinine Miglitol Pan-Hong, Yu verfasserin aut Hu, Zhong-Ce verfasserin aut Chen, Liang verfasserin aut Sun, Xin-Qiang verfasserin aut Zheng, Yu-Guo verfasserin aut Enthalten in Journal of biotechnology Amsterdam [u.a.] : Elsevier Science, 1984 300, Seite 55-62 Online-Ressource (DE-627)320570851 (DE-600)2016476-2 (DE-576)090956125 1873-4863 nnns volume:300 pages:55-62 GBV_USEFLAG_U SYSFLAG_U GBV_ELV SSG-OLC-PHA GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_32 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_74 GBV_ILN_90 GBV_ILN_95 GBV_ILN_100 GBV_ILN_101 GBV_ILN_105 GBV_ILN_110 GBV_ILN_150 GBV_ILN_151 GBV_ILN_224 GBV_ILN_370 GBV_ILN_602 GBV_ILN_702 GBV_ILN_2003 GBV_ILN_2004 GBV_ILN_2005 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2015 GBV_ILN_2020 GBV_ILN_2021 GBV_ILN_2025 GBV_ILN_2027 GBV_ILN_2034 GBV_ILN_2038 GBV_ILN_2044 GBV_ILN_2048 GBV_ILN_2049 GBV_ILN_2050 GBV_ILN_2056 GBV_ILN_2059 GBV_ILN_2061 GBV_ILN_2064 GBV_ILN_2065 GBV_ILN_2068 GBV_ILN_2111 GBV_ILN_2112 GBV_ILN_2113 GBV_ILN_2118 GBV_ILN_2122 GBV_ILN_2129 GBV_ILN_2143 GBV_ILN_2147 GBV_ILN_2148 GBV_ILN_2152 GBV_ILN_2153 GBV_ILN_2190 GBV_ILN_2336 GBV_ILN_2507 GBV_ILN_2522 GBV_ILN_4035 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4242 GBV_ILN_4251 GBV_ILN_4305 GBV_ILN_4313 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4326 GBV_ILN_4333 GBV_ILN_4334 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4393 58.30 Biotechnologie AR 300 55-62 |
| spelling |
10.1016/j.jbiotec.2019.05.007 doi (DE-627)ELV002414627 (ELSEVIER)S0168-1656(19)30163-4 DE-627 ger DE-627 rda eng 540 DE-600 58.30 bkl Ke, Xia verfasserin aut Synergistic improvement of PQQ-dependent D-sorbitol dehydrogenase activity from 2019 nicht spezifiziert zzz rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier 6-(N-hydroxyethyl) amino-6-deoxy-l-sorbofuranose (6NSL) is the direct precursor of miglitol for diabetes therapy. The regio- and stereo-selective dehydrogenation offered by the membrane-bound d-sorbitol dehydrogenase (mSLDH) from Gluconobacter oxydans provides an elegant enzymatic method for 6NSL production. In this study, two subunits sldA and sldB of mSLDH were introduced into G. oxydans ZJB-605, and the specific enzyme activity of mSLDH towards NHEG was enhanced by 2.15-fold. However, the endogenous PQQ level was dramatically reduced in the recombinant strain and became a bottleneck to support the holo-enzyme activity. A combined supplementation of four amino acids (Glu, Ile, Ser, Arg) involved in biosynthesis of PQQ in conventional media effectively increased extracellular accumulation of PQQ by 1.49-fold, which further enhanced mSLDH activity by 1.33-fold. The synergic improvement of mSLDH activity provided in this study supports the superior high dehydrogenate activity towards substrate N-2-hydroxyethyl-glucamine, 184.28 g·L−1 of 6NSL was produced after a repeated bioconversion process catalyzed by the resting cells of G. oxydans/pBB-sldAB, all of which presenting a great potential of their industrial application in 6NSL biosynthesis. Membrane-bound D-sorbitol dehydrogenase Pyrroloquinoline quinine Miglitol Pan-Hong, Yu verfasserin aut Hu, Zhong-Ce verfasserin aut Chen, Liang verfasserin aut Sun, Xin-Qiang verfasserin aut Zheng, Yu-Guo verfasserin aut Enthalten in Journal of biotechnology Amsterdam [u.a.] : Elsevier Science, 1984 300, Seite 55-62 Online-Ressource (DE-627)320570851 (DE-600)2016476-2 (DE-576)090956125 1873-4863 nnns volume:300 pages:55-62 GBV_USEFLAG_U SYSFLAG_U GBV_ELV SSG-OLC-PHA GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_32 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_74 GBV_ILN_90 GBV_ILN_95 GBV_ILN_100 GBV_ILN_101 GBV_ILN_105 GBV_ILN_110 GBV_ILN_150 GBV_ILN_151 GBV_ILN_224 GBV_ILN_370 GBV_ILN_602 GBV_ILN_702 GBV_ILN_2003 GBV_ILN_2004 GBV_ILN_2005 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2015 GBV_ILN_2020 GBV_ILN_2021 GBV_ILN_2025 GBV_ILN_2027 GBV_ILN_2034 GBV_ILN_2038 GBV_ILN_2044 GBV_ILN_2048 GBV_ILN_2049 GBV_ILN_2050 GBV_ILN_2056 GBV_ILN_2059 GBV_ILN_2061 GBV_ILN_2064 GBV_ILN_2065 GBV_ILN_2068 GBV_ILN_2111 GBV_ILN_2112 GBV_ILN_2113 GBV_ILN_2118 GBV_ILN_2122 GBV_ILN_2129 GBV_ILN_2143 GBV_ILN_2147 GBV_ILN_2148 GBV_ILN_2152 GBV_ILN_2153 GBV_ILN_2190 GBV_ILN_2336 GBV_ILN_2507 GBV_ILN_2522 GBV_ILN_4035 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4242 GBV_ILN_4251 GBV_ILN_4305 GBV_ILN_4313 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4326 GBV_ILN_4333 GBV_ILN_4334 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4393 58.30 Biotechnologie AR 300 55-62 |
| allfields_unstemmed |
10.1016/j.jbiotec.2019.05.007 doi (DE-627)ELV002414627 (ELSEVIER)S0168-1656(19)30163-4 DE-627 ger DE-627 rda eng 540 DE-600 58.30 bkl Ke, Xia verfasserin aut Synergistic improvement of PQQ-dependent D-sorbitol dehydrogenase activity from 2019 nicht spezifiziert zzz rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier 6-(N-hydroxyethyl) amino-6-deoxy-l-sorbofuranose (6NSL) is the direct precursor of miglitol for diabetes therapy. The regio- and stereo-selective dehydrogenation offered by the membrane-bound d-sorbitol dehydrogenase (mSLDH) from Gluconobacter oxydans provides an elegant enzymatic method for 6NSL production. In this study, two subunits sldA and sldB of mSLDH were introduced into G. oxydans ZJB-605, and the specific enzyme activity of mSLDH towards NHEG was enhanced by 2.15-fold. However, the endogenous PQQ level was dramatically reduced in the recombinant strain and became a bottleneck to support the holo-enzyme activity. A combined supplementation of four amino acids (Glu, Ile, Ser, Arg) involved in biosynthesis of PQQ in conventional media effectively increased extracellular accumulation of PQQ by 1.49-fold, which further enhanced mSLDH activity by 1.33-fold. The synergic improvement of mSLDH activity provided in this study supports the superior high dehydrogenate activity towards substrate N-2-hydroxyethyl-glucamine, 184.28 g·L−1 of 6NSL was produced after a repeated bioconversion process catalyzed by the resting cells of G. oxydans/pBB-sldAB, all of which presenting a great potential of their industrial application in 6NSL biosynthesis. Membrane-bound D-sorbitol dehydrogenase Pyrroloquinoline quinine Miglitol Pan-Hong, Yu verfasserin aut Hu, Zhong-Ce verfasserin aut Chen, Liang verfasserin aut Sun, Xin-Qiang verfasserin aut Zheng, Yu-Guo verfasserin aut Enthalten in Journal of biotechnology Amsterdam [u.a.] : Elsevier Science, 1984 300, Seite 55-62 Online-Ressource (DE-627)320570851 (DE-600)2016476-2 (DE-576)090956125 1873-4863 nnns volume:300 pages:55-62 GBV_USEFLAG_U SYSFLAG_U GBV_ELV SSG-OLC-PHA GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_32 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_74 GBV_ILN_90 GBV_ILN_95 GBV_ILN_100 GBV_ILN_101 GBV_ILN_105 GBV_ILN_110 GBV_ILN_150 GBV_ILN_151 GBV_ILN_224 GBV_ILN_370 GBV_ILN_602 GBV_ILN_702 GBV_ILN_2003 GBV_ILN_2004 GBV_ILN_2005 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2015 GBV_ILN_2020 GBV_ILN_2021 GBV_ILN_2025 GBV_ILN_2027 GBV_ILN_2034 GBV_ILN_2038 GBV_ILN_2044 GBV_ILN_2048 GBV_ILN_2049 GBV_ILN_2050 GBV_ILN_2056 GBV_ILN_2059 GBV_ILN_2061 GBV_ILN_2064 GBV_ILN_2065 GBV_ILN_2068 GBV_ILN_2111 GBV_ILN_2112 GBV_ILN_2113 GBV_ILN_2118 GBV_ILN_2122 GBV_ILN_2129 GBV_ILN_2143 GBV_ILN_2147 GBV_ILN_2148 GBV_ILN_2152 GBV_ILN_2153 GBV_ILN_2190 GBV_ILN_2336 GBV_ILN_2507 GBV_ILN_2522 GBV_ILN_4035 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4242 GBV_ILN_4251 GBV_ILN_4305 GBV_ILN_4313 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4326 GBV_ILN_4333 GBV_ILN_4334 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4393 58.30 Biotechnologie AR 300 55-62 |
| allfieldsGer |
10.1016/j.jbiotec.2019.05.007 doi (DE-627)ELV002414627 (ELSEVIER)S0168-1656(19)30163-4 DE-627 ger DE-627 rda eng 540 DE-600 58.30 bkl Ke, Xia verfasserin aut Synergistic improvement of PQQ-dependent D-sorbitol dehydrogenase activity from 2019 nicht spezifiziert zzz rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier 6-(N-hydroxyethyl) amino-6-deoxy-l-sorbofuranose (6NSL) is the direct precursor of miglitol for diabetes therapy. The regio- and stereo-selective dehydrogenation offered by the membrane-bound d-sorbitol dehydrogenase (mSLDH) from Gluconobacter oxydans provides an elegant enzymatic method for 6NSL production. In this study, two subunits sldA and sldB of mSLDH were introduced into G. oxydans ZJB-605, and the specific enzyme activity of mSLDH towards NHEG was enhanced by 2.15-fold. However, the endogenous PQQ level was dramatically reduced in the recombinant strain and became a bottleneck to support the holo-enzyme activity. A combined supplementation of four amino acids (Glu, Ile, Ser, Arg) involved in biosynthesis of PQQ in conventional media effectively increased extracellular accumulation of PQQ by 1.49-fold, which further enhanced mSLDH activity by 1.33-fold. The synergic improvement of mSLDH activity provided in this study supports the superior high dehydrogenate activity towards substrate N-2-hydroxyethyl-glucamine, 184.28 g·L−1 of 6NSL was produced after a repeated bioconversion process catalyzed by the resting cells of G. oxydans/pBB-sldAB, all of which presenting a great potential of their industrial application in 6NSL biosynthesis. Membrane-bound D-sorbitol dehydrogenase Pyrroloquinoline quinine Miglitol Pan-Hong, Yu verfasserin aut Hu, Zhong-Ce verfasserin aut Chen, Liang verfasserin aut Sun, Xin-Qiang verfasserin aut Zheng, Yu-Guo verfasserin aut Enthalten in Journal of biotechnology Amsterdam [u.a.] : Elsevier Science, 1984 300, Seite 55-62 Online-Ressource (DE-627)320570851 (DE-600)2016476-2 (DE-576)090956125 1873-4863 nnns volume:300 pages:55-62 GBV_USEFLAG_U SYSFLAG_U GBV_ELV SSG-OLC-PHA GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_32 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_74 GBV_ILN_90 GBV_ILN_95 GBV_ILN_100 GBV_ILN_101 GBV_ILN_105 GBV_ILN_110 GBV_ILN_150 GBV_ILN_151 GBV_ILN_224 GBV_ILN_370 GBV_ILN_602 GBV_ILN_702 GBV_ILN_2003 GBV_ILN_2004 GBV_ILN_2005 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2015 GBV_ILN_2020 GBV_ILN_2021 GBV_ILN_2025 GBV_ILN_2027 GBV_ILN_2034 GBV_ILN_2038 GBV_ILN_2044 GBV_ILN_2048 GBV_ILN_2049 GBV_ILN_2050 GBV_ILN_2056 GBV_ILN_2059 GBV_ILN_2061 GBV_ILN_2064 GBV_ILN_2065 GBV_ILN_2068 GBV_ILN_2111 GBV_ILN_2112 GBV_ILN_2113 GBV_ILN_2118 GBV_ILN_2122 GBV_ILN_2129 GBV_ILN_2143 GBV_ILN_2147 GBV_ILN_2148 GBV_ILN_2152 GBV_ILN_2153 GBV_ILN_2190 GBV_ILN_2336 GBV_ILN_2507 GBV_ILN_2522 GBV_ILN_4035 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4242 GBV_ILN_4251 GBV_ILN_4305 GBV_ILN_4313 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4326 GBV_ILN_4333 GBV_ILN_4334 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4393 58.30 Biotechnologie AR 300 55-62 |
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Synergistic improvement of PQQ-dependent D-sorbitol dehydrogenase activity from |
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Synergistic improvement of PQQ-dependent D-sorbitol dehydrogenase activity from |
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Ke, Xia |
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Ke, Xia Pan-Hong, Yu Hu, Zhong-Ce Chen, Liang Sun, Xin-Qiang Zheng, Yu-Guo |
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synergistic improvement of pqq-dependent d-sorbitol dehydrogenase activity from |
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Synergistic improvement of PQQ-dependent D-sorbitol dehydrogenase activity from |
| abstract |
6-(N-hydroxyethyl) amino-6-deoxy-l-sorbofuranose (6NSL) is the direct precursor of miglitol for diabetes therapy. The regio- and stereo-selective dehydrogenation offered by the membrane-bound d-sorbitol dehydrogenase (mSLDH) from Gluconobacter oxydans provides an elegant enzymatic method for 6NSL production. In this study, two subunits sldA and sldB of mSLDH were introduced into G. oxydans ZJB-605, and the specific enzyme activity of mSLDH towards NHEG was enhanced by 2.15-fold. However, the endogenous PQQ level was dramatically reduced in the recombinant strain and became a bottleneck to support the holo-enzyme activity. A combined supplementation of four amino acids (Glu, Ile, Ser, Arg) involved in biosynthesis of PQQ in conventional media effectively increased extracellular accumulation of PQQ by 1.49-fold, which further enhanced mSLDH activity by 1.33-fold. The synergic improvement of mSLDH activity provided in this study supports the superior high dehydrogenate activity towards substrate N-2-hydroxyethyl-glucamine, 184.28 g·L−1 of 6NSL was produced after a repeated bioconversion process catalyzed by the resting cells of G. oxydans/pBB-sldAB, all of which presenting a great potential of their industrial application in 6NSL biosynthesis. |
| abstractGer |
6-(N-hydroxyethyl) amino-6-deoxy-l-sorbofuranose (6NSL) is the direct precursor of miglitol for diabetes therapy. The regio- and stereo-selective dehydrogenation offered by the membrane-bound d-sorbitol dehydrogenase (mSLDH) from Gluconobacter oxydans provides an elegant enzymatic method for 6NSL production. In this study, two subunits sldA and sldB of mSLDH were introduced into G. oxydans ZJB-605, and the specific enzyme activity of mSLDH towards NHEG was enhanced by 2.15-fold. However, the endogenous PQQ level was dramatically reduced in the recombinant strain and became a bottleneck to support the holo-enzyme activity. A combined supplementation of four amino acids (Glu, Ile, Ser, Arg) involved in biosynthesis of PQQ in conventional media effectively increased extracellular accumulation of PQQ by 1.49-fold, which further enhanced mSLDH activity by 1.33-fold. The synergic improvement of mSLDH activity provided in this study supports the superior high dehydrogenate activity towards substrate N-2-hydroxyethyl-glucamine, 184.28 g·L−1 of 6NSL was produced after a repeated bioconversion process catalyzed by the resting cells of G. oxydans/pBB-sldAB, all of which presenting a great potential of their industrial application in 6NSL biosynthesis. |
| abstract_unstemmed |
6-(N-hydroxyethyl) amino-6-deoxy-l-sorbofuranose (6NSL) is the direct precursor of miglitol for diabetes therapy. The regio- and stereo-selective dehydrogenation offered by the membrane-bound d-sorbitol dehydrogenase (mSLDH) from Gluconobacter oxydans provides an elegant enzymatic method for 6NSL production. In this study, two subunits sldA and sldB of mSLDH were introduced into G. oxydans ZJB-605, and the specific enzyme activity of mSLDH towards NHEG was enhanced by 2.15-fold. However, the endogenous PQQ level was dramatically reduced in the recombinant strain and became a bottleneck to support the holo-enzyme activity. A combined supplementation of four amino acids (Glu, Ile, Ser, Arg) involved in biosynthesis of PQQ in conventional media effectively increased extracellular accumulation of PQQ by 1.49-fold, which further enhanced mSLDH activity by 1.33-fold. The synergic improvement of mSLDH activity provided in this study supports the superior high dehydrogenate activity towards substrate N-2-hydroxyethyl-glucamine, 184.28 g·L−1 of 6NSL was produced after a repeated bioconversion process catalyzed by the resting cells of G. oxydans/pBB-sldAB, all of which presenting a great potential of their industrial application in 6NSL biosynthesis. |
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Pan-Hong, Yu Hu, Zhong-Ce Chen, Liang Sun, Xin-Qiang Zheng, Yu-Guo |
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