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Integrated Approaches to Reveal Genes Crucial for Tannin Degradation in Aureobasidium melanogenum T9

文献类型： 外文期刊

作者： Zhang, Lin-Lin 1 ; Li, Jie 2 ; Wang, Yi-Lin 3 ; Liu, Song 4 ; Wang, Zhi-Peng 5 ; Yu, Xin-Jun 6 ;

作者机构： 1.Shandong Univ Sci & Technol, Coll Chem & Environm Engn, Qingdao 266510, Shandong, Peoples R China

2.Chinese Acad Fishery Sci, Yellow Sea Fisheries Res Inst, Qingdao Natl Lab Marine Sci & Technol, Lab Marine Fisheries & Aquaculture, Qingdao 266071, Shandong, Peoples R China

3.China Univ Petr, Coll Sci, Qingdao 266580, Shandong, Peoples R China

4.Dev & Reform Bur, West Coast New Area, Qingdao 266000, Shandong, Peoples R China

5.Chinese Acad Fishery Sci, Yellow Sea Fisheries Res Inst, Minist Agr & Rural Affairs, Key Lab Sustainable Dev Polar Fishery, Qingdao 266071, Shandong, Peoples R China

6.Zhejiang Univ Technol, Coll Biotechnol & Bioengn, Key Lab Bioorgan Synth Zhejiang Prov, Hangzhou 310014, Zhejiang, Peoples R China

关键词： tannins biodegradation; Aureobasidium melanogenum; Tannase; gallic acid decarboxylase

期刊名称：BIOMOLECULES （ 影响因子：4.879； 五年影响因子：5.362 ）

ISSN：

年卷期： 2019 年 9 卷 9 期

页码：

收录情况： SCI

摘要： Tannins biodegradation by a microorganism is one of the most efficient ways to produce bioproducts of high value. However, the mechanism of tannins biodegradation by yeast has been little explored. In this study, Aureobasidium melanogenum T9 isolated from red wine starter showed the ability for tannins degradation and had its highest biomass when the initial tannic acid concentration was 20 g/L. Furthermore, the genes involved in the tannin degradation process were analyzed. Genes tan A, tan B and tan C encoding three different tannases respectively were identified in the A. melanogenum T9. Among these genes, tan A and tan B can be induced by tannin acid simultaneously at both gene transcription and protein expression levels. Our assay result showed that the deletion of tanA and tanB resulted in tannase activity decline with 51.3 +/- 4.1 and 64.1 +/- 1.9 U/mL, respectively, which is much lower than that of A. melanogenum T9 with 91.3 +/- 5.8 U/mL. In addition, another gene coding gallic acid decarboxylase (gad) was knocked out to better clarify its function. Mutant Delta gad completely lost gallic acid decarboxylase activity and no pyrogallic acid was seen during the entire cultivation process, confirming that there was a sole gene encoding decarboxylase in the A. melanogenum T9. These results demonstrated that tanA, tanB and gad were crucial for tannin degradation and provided new insights for the mechanism of tannins biodegradation by yeast. This finding showed that A. melanogenum has potential in the production of tannase and metabolites, such as gall acid and pyrogallol.

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