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首页> 外文期刊>Journal of bacteriology >Characterization of Alginate Lyase from Pseudomonas syringae pv. syringae
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Characterization of Alginate Lyase from Pseudomonas syringae pv. syringae

机译:丁香假单胞菌PV藻酸盐裂解酶的表征。丁香科

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摘要

The gene encoding alginate lyase (algL) inPseudomonas syringae pv. syringae was cloned, sequenced, and overexpressed in Escherichia coli. Alginate lyase activity was optimal when the pH was 7.0 and when assays were conducted at 42°C in the presence of 0.2 M NaCl. In substrate specificity studies, AlgL from P. syringae showed a preference for deacetylated polymannuronic acid. Sequence alignment with other alginate lyases revealed conserved regions within AlgL likely to be important for the structure and/or function of the enzyme. Site-directed mutagenesis of histidine and tryptophan residues at positions 204 and 207, respectively, indicated that these amino acids are critical for lyase activity.
机译:丁香假单胞菌pv中藻酸盐裂解酶( algL )的编码基因。在大肠埃希氏菌中克隆丁香丁香科,测序并过表达。当pH值为7.0以及在0.2 M NaCl存在下于42°C进行测定时,藻酸盐裂解酶活性最佳。在底物特异性研究中,来自 P的AlgL。丁香科植物表现出对脱乙酰聚甘露糖醛酸的偏好。与其他藻酸盐裂解酶的序列比对揭示了AlgL中的保守区域可能对酶的结构和/或功能很重要。组氨酸和色氨酸残基分别在位置204和207的定点诱变表明这些氨基酸对于裂解酶活性至关重要。

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