KMID : 1094720120170040729
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Biotechnology and Bioprocess Engineering 2012 Volume.17 No. 4 p.729 ~ p.738
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Characterization of a family 3 polysaccharide lyase with broad temperature adaptability, thermo-alkali stability, and ethanol tolerance
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Zhou Junpei
Dong Yanyan Gao Yajie Tang Xianghua Li Junjun Yang Yunjuan Xu Bo Xie Zhenrong Huang Zunxi
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Abstract
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The 774-bp pectate lyase gene plyAI4 from Bacillus sp. I4 was cloned and expressed in E. coli. The gene encodes a 257-residue polypeptide (PlyAI4, 28.3 kDa) with the highest identities of 97.3% with a putative pectate lyase from Bacillus subtilis BSn5 (ADV94306) and 60.3% with an identified pectate lyase of the polysaccharide lyase family (PL) 3 from Paenibacillus amylolyticus 27C64 (ADB78774). The purified recombinant PlyAI4 (rPlyAI4) exhibited apparently optimal activity at pH 10.5 ¡ 11.0 and 50¡ÆC. Compared with the majority of reported alkaline pectate lyases, rPlyAI4 exhibited more residual enzyme activity at 20¡ÆC (¡45%) or at 70¡ÆC (¡50%) and better thermostability at 70¡ÆC (¡60 min half-life at 70¡ÆC). In the presence of 20% (v/v) ethanol, pectate lyase activity was enhanced by 0.2 fold. After incubation in 40% (v/v) ethanol at 37¡ÆC and pH 8.5 for 1 h, the purified rPelAI4 retained more than 75% of the initial activity. Sequence analysis proposed a new signature block, A-D-G-[V/I]-H, for PL 3 pectate lyases. These properties may prove to be important with regards to PlyAI4 for basic research and industrial application.
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KEYWORD
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pectate lyase, temperature adaptability, thermoalkali stability, ethanol, signature block
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