A Novel Highly Thermostable Multifunctional Beta-Glycosidase from Crenarchaeon Acidilobus saccharovorans

IF 4.6 Q2 MATERIALS SCIENCE, BIOMATERIALS ACS Applied Bio Materials Pub Date : 2015-10-11 DOI:10.1155/2015/978632

V. Gumerov, A. Rakitin, A. Mardanov, N. Ravin

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引用次数: 15

Abstract

We expressed a putative β-galactosidase Asac_1390 from hyperthermophilic crenarchaeon Acidilobus saccharovorans in Escherichia coli and purified the recombinant enzyme. Asac_1390 is composed of 490 amino acid residues and showed high sequence similarity to family 1 glycoside hydrolases from various thermophilic Crenarchaeota. The maximum activity was observed at pH 6.0 and 93°C. The half-life of the enzyme at 90°C was about 7 hours. Asac_1390 displayed high tolerance to glucose and exhibits hydrolytic activity towards cellobiose and various aryl glucosides. The hydrolytic activity with p-nitrophenyl (pNP) substrates followed the order pNP-β-D-galactopyranoside (328 U mg−1), pNP-β-D-glucopyranoside (246 U mg−1), pNP-β-D-xylopyranoside (72 U mg−1), and pNP-β-D-mannopyranoside (28 U mg−1). Thus the enzyme was actually a multifunctional β-glycosidase. Therefore, the utilization of Asac_1390 may contribute to facilitating the efficient degradation of lignocellulosic biomass and help enhance bioconversion processes.

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一种新型高耐热性多功能β -糖苷酶

我们在大肠杆菌中表达了一种推测的β-半乳糖苷酶Asac_1390，并纯化了重组酶。Asac_1390由490个氨基酸残基组成，与各种嗜热绿藻的1家族糖苷水解酶具有高度的序列相似性。在pH 6.0和93°C条件下活性最高。酶在90℃下的半衰期约为7小时。Asac_1390对葡萄糖具有较高的耐受性，对纤维素二糖和各种芳基糖苷具有水解活性。对硝基苯基(pNP)底物的水解活性依次为:pNP-β- d -半乳糖苷(328 U mg−1)、pNP-β- d -葡萄糖吡喃苷(246 U mg−1)、pNP-β- d -木吡喃苷(72 U mg−1)和pNP-β- d -甘露吡喃苷(28 U mg−1)。因此，该酶实际上是一种多功能β-糖苷酶。因此，利用Asac_1390可能有助于促进木质纤维素生物质的有效降解，并有助于提高生物转化过程。

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