KMID : 0545120230330111521
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Journal of Microbiology and Biotechnology 2023 Volume.33 No. 11 p.1521 ~ p.1530
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Heterologous Expression and Characterization of a Thermostable ¥á-L-Rhamnosidase from Thermoclostridium stercorarium subsp. thermolacticum DSM 2910 and Its Application in the Biotransformation of Rutin
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Lin Ge
Yingying Liu Fangming Zhou Lingling Zhan Linguo Zhao
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Abstract
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An ¥á-L-rhamnosidase gene from Thermoclostridium. stercorarium subsp. thermolacticum DSM 2910 (TstRhaA) was cloned and expressed. The maximum TstRhaA activity of the protein reached 25.2 U/ml, and the molecular mass was approximately 106.6 kDa. The protein was purified 8.0-fold by Ni-TED affinity with an overall recovery of 16.6% and a specific activity of 187.9 U/mg. TstRhaA activity was the highest at 65¡ÆC and pH 6.5. In addition, it exhibited excellent thermal stability, better pH stability, good tolerance to low concentrations of organic reagents, and high catalytic activity for p-nitrophenyl-¥á-L-rhamnopyranoside (pNPR). Substrate specificity studies showed that TstRhaA exhibited a high specific activity for rutin. At 60¡ÆC, pH 6.5, and 0.3 U/ml enzyme dosage, 60 g/l rutin was converted to 45.55 g/l isoquercitrin within 150 min. The molar conversion rate of rutin and the yield of isoquercitrin were 99.8% and 12.22 g/l/h, respectively. The results suggested that TstRhaA could be used for mass production of isoquercitrin.
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KEYWORD
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Thermoclostridium stercorarium subsp. thermolacticum DSM 2910, ¥á-L-rhamnosidase, thermal stability, isoquercitrin
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