Thermal behaviour and tolerance to ionic liquid [emim]OAc in GH10 xylanase from Thermoascus aurantiacus SL16W
© 2014, Springer Japan. GH10 xylanase from Thermoascus aurantiacus strain SL16W (TasXyn10A) showed high stability and activity up to 70–75 °C. The enzyme’s half-lives were 101 h, 65 h, 63 min and 6 min at 60, 70, 75 and 80 °C, respectively. The melting point (Tm), as measured by DSC, was 78.5 °C, wh...
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th-cmuir.6653943832-531782018-09-04T09:52:39Z Thermal behaviour and tolerance to ionic liquid [emim]OAc in GH10 xylanase from Thermoascus aurantiacus SL16W Niwat Chawachart Sasikala Anbarasan Samuel Turunen He Li Chartchai Khanongnuch Michael Hummel Herbert Sixta Tom Granström Saisamorn Lumyong Ossi Turunen Biochemistry, Genetics and Molecular Biology Immunology and Microbiology © 2014, Springer Japan. GH10 xylanase from Thermoascus aurantiacus strain SL16W (TasXyn10A) showed high stability and activity up to 70–75 °C. The enzyme’s half-lives were 101 h, 65 h, 63 min and 6 min at 60, 70, 75 and 80 °C, respectively. The melting point (Tm), as measured by DSC, was 78.5 °C, which is in line with a strong activity decrease at 75–80 °C. The biomass-dissolving ionic liquid 1-ethyl-3-methylimidazolium acetate ([emim]OAc) in 30 % concentration had a small effect on the stability of TasXyn10A; Tmdecreased by only 5 °C. It was also observed that [emim]OAc inhibited much less GH10 xylanase (TasXyn10A) than the studied GH11 xylanases. The Kmof TasXyn10A increased 3.5-fold in 15 % [emim]OAc with xylan as the substrate, whereas the approximate level of Vmaxwas not altered. The inhibition of enzyme activity by [emim]OAc was lesser at higher substrate concentrations. Therefore, high solid concentrations in industrial conditions may mitigate the inhibition of enzyme activity by ionic liquids. Molecular docking experiments indicated that the [emim] cation has major binding sites near the catalytic residues but in lower amounts in GH10 than in GH11 xylanases. Therefore, [emim] cation likely competes with the substrate when binding to the active site. The docking results indicated why the effect is lower in GH10. 2018-09-04T09:44:45Z 2018-09-04T09:44:45Z 2014-11-01 Journal 14334909 14310651 2-s2.0-84937511922 10.1007/s00792-014-0679-0 https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=84937511922&origin=inward http://cmuir.cmu.ac.th/jspui/handle/6653943832/53178 |
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Biochemistry, Genetics and Molecular Biology Immunology and Microbiology Niwat Chawachart Sasikala Anbarasan Samuel Turunen He Li Chartchai Khanongnuch Michael Hummel Herbert Sixta Tom Granström Saisamorn Lumyong Ossi Turunen Thermal behaviour and tolerance to ionic liquid [emim]OAc in GH10 xylanase from Thermoascus aurantiacus SL16W |
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© 2014, Springer Japan. GH10 xylanase from Thermoascus aurantiacus strain SL16W (TasXyn10A) showed high stability and activity up to 70–75 °C. The enzyme’s half-lives were 101 h, 65 h, 63 min and 6 min at 60, 70, 75 and 80 °C, respectively. The melting point (Tm), as measured by DSC, was 78.5 °C, which is in line with a strong activity decrease at 75–80 °C. The biomass-dissolving ionic liquid 1-ethyl-3-methylimidazolium acetate ([emim]OAc) in 30 % concentration had a small effect on the stability of TasXyn10A; Tmdecreased by only 5 °C. It was also observed that [emim]OAc inhibited much less GH10 xylanase (TasXyn10A) than the studied GH11 xylanases. The Kmof TasXyn10A increased 3.5-fold in 15 % [emim]OAc with xylan as the substrate, whereas the approximate level of Vmaxwas not altered. The inhibition of enzyme activity by [emim]OAc was lesser at higher substrate concentrations. Therefore, high solid concentrations in industrial conditions may mitigate the inhibition of enzyme activity by ionic liquids. Molecular docking experiments indicated that the [emim] cation has major binding sites near the catalytic residues but in lower amounts in GH10 than in GH11 xylanases. Therefore, [emim] cation likely competes with the substrate when binding to the active site. The docking results indicated why the effect is lower in GH10. |
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Niwat Chawachart Sasikala Anbarasan Samuel Turunen He Li Chartchai Khanongnuch Michael Hummel Herbert Sixta Tom Granström Saisamorn Lumyong Ossi Turunen |
author_facet |
Niwat Chawachart Sasikala Anbarasan Samuel Turunen He Li Chartchai Khanongnuch Michael Hummel Herbert Sixta Tom Granström Saisamorn Lumyong Ossi Turunen |
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Niwat Chawachart |
title |
Thermal behaviour and tolerance to ionic liquid [emim]OAc in GH10 xylanase from Thermoascus aurantiacus SL16W |
title_short |
Thermal behaviour and tolerance to ionic liquid [emim]OAc in GH10 xylanase from Thermoascus aurantiacus SL16W |
title_full |
Thermal behaviour and tolerance to ionic liquid [emim]OAc in GH10 xylanase from Thermoascus aurantiacus SL16W |
title_fullStr |
Thermal behaviour and tolerance to ionic liquid [emim]OAc in GH10 xylanase from Thermoascus aurantiacus SL16W |
title_full_unstemmed |
Thermal behaviour and tolerance to ionic liquid [emim]OAc in GH10 xylanase from Thermoascus aurantiacus SL16W |
title_sort |
thermal behaviour and tolerance to ionic liquid [emim]oac in gh10 xylanase from thermoascus aurantiacus sl16w |
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2018 |
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https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=84937511922&origin=inward http://cmuir.cmu.ac.th/jspui/handle/6653943832/53178 |
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