A comparative study of the efficacy of alginate lyases in the presence of metal ions elevated in the cystic fibrosis lung milieu

IF 2.3 Q3 BIOCHEMISTRY & MOLECULAR BIOLOGY
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Abstract

Pseudomonas aeruginosa, a common cause of morbidity in cystic fibrosis, chronically infects the patient's lungs by forming an alginate-containing biofilm. Alginate lyases are polysaccharide lyases that lyse alginate and are, therefore, potential biofilm-disruptive agents. However, cystic fibrosis sputum contains high levels of metals such as iron and zinc. The efficacy of alginate lyases under these conditions of elevated metal concentrations has not been categorically determined. Here, we have assessed the enzyme activity of two exolytic and five endolytic alginate lyases in the presence of metal ions (Fe2+, Zn2+, Mn2+, Mg2+, Ca2+, Ni2+, Cu2+) elevated in the cystic fibrosis lung milieu. Several of these alginate lyases exhibited increased activity in the presence of Ca2+, and the polysaccharide lyase family 7 members studied here exhibited decreased activity in the presence of Zn2+. The enzyme activity of the PL7 alginate lyases from Cellulophaga algicola (CaAly/CaFLDAly) and Vibrio sp. (VspAlyVI) was not affected in the presence of a mix of all the above-mentioned metal ions at the elevated concentrations found in the cystic fibrosis lung milieu. Specific alginate lyases might, therefore, retain the ability to degrade the alginate-containing Pseudomonas biofilm in the presence of metal ions elevated in the cystic fibrosis lung milieu.

藻酸盐裂解酶在囊性纤维化肺环境中金属离子升高时的功效比较研究
铜绿假单胞菌是导致囊性纤维化发病的常见原因,它通过形成含有藻酸盐的生物膜长期感染患者的肺部。藻酸盐裂解酶是一种能裂解藻酸盐的多糖裂解酶,因此是潜在的生物膜破坏剂。然而,囊性纤维化痰中含有大量铁和锌等金属。在这些金属浓度升高的条件下,藻酸盐裂解酶的功效尚未明确确定。在此,我们评估了在囊性纤维化肺部环境中金属离子(Fe2+、Zn2+、Mn2+、Mg2+、Ca2+、Ni2+、Cu2+)含量升高的情况下,两种外溶性和五种内溶性藻酸盐裂解酶的酶活性。这些藻酸盐裂解酶中有几种在 Ca2+ 存在时活性增加,而本文研究的多糖裂解酶家族 7 成员在 Zn2+ 存在时活性降低。在囊性纤维化肺环境中浓度较高的上述所有金属离子混合存在时,来自 Cellulophaga algicola(CaAly/CaFLDAly)和弧菌(VspAlyVI)的 PL7 藻酸盐裂解酶的酶活性不受影响。因此,在囊性纤维化肺环境中金属离子浓度升高的情况下,特定的藻酸盐裂解酶仍有能力降解含藻酸盐的假单胞菌生物膜。
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来源期刊
Biochemistry and Biophysics Reports
Biochemistry and Biophysics Reports Biochemistry, Genetics and Molecular Biology-Biophysics
CiteScore
4.60
自引率
0.00%
发文量
191
审稿时长
59 days
期刊介绍: Open access, online only, peer-reviewed international journal in the Life Sciences, established in 2014 Biochemistry and Biophysics Reports (BB Reports) publishes original research in all aspects of Biochemistry, Biophysics and related areas like Molecular and Cell Biology. BB Reports welcomes solid though more preliminary, descriptive and small scale results if they have the potential to stimulate and/or contribute to future research, leading to new insights or hypothesis. Primary criteria for acceptance is that the work is original, scientifically and technically sound and provides valuable knowledge to life sciences research. We strongly believe all results deserve to be published and documented for the advancement of science. BB Reports specifically appreciates receiving reports on: Negative results, Replication studies, Reanalysis of previous datasets.
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