Acid stress induces cross-protection for cadmium tolerance of multi-stress-tolerant Pichia kudriavzevii by regulating cadmium transport and antioxidant defense system
文献类型： 外文期刊
作者： Li, Chunsheng 1 ; Xu, Ying 2 ; Li, Laihao 1 ; Yang, Xianqing 1 ; Wang, Yueqi 1 ;
作者机构： 1.Chinese Acad Fishery Sci, Natl R&D Ctr Aquat Prod Proc, South China Sea Fisheries Res Inst, Key Lab Aquat Prod Proc,Minist Agr & Rural Affair, Guangzhou 510300, Guangdong, Peoples R China
2.Ocean Univ China, Coll Food Sci & Engn, Qingdao 266003, Peoples R China
关键词： Cross-protection; Acid stress; Cadmium tolerance; Cadmium conjugation; Antioxidant enzyme
期刊名称：JOURNAL OF HAZARDOUS MATERIALS （ 影响因子：10.588； 五年影响因子：10.129 ）
ISSN： 0304-3894
年卷期： 2019 年 366 卷
页码：
收录情况： SCI
摘要： The toxicity of cadmium (Cd) is the major limitation to its removal using microorganisms. The Cd tolerance of Pichia kudriavzevii was obviously enhanced by acid stress based on multi-stress cross-protection. RNA-Seq showed that most differentially expressed genes (DEGs) in the Pentose phosphate pathway, Citrate cycle (TCA cycle), Glycolysis/Gluconeogenesis, Peroxisome and Glutathione metabolism were up-regulated by acid stress. The up-regulated expression of genes related to ATP synthesis (GOR1, ALD5, ADH4, ADH6, MDH2, IDH1, IDH2, and ATP19) and Cd transport (GSTY2, GTO2, GLO2, and YOR1), and the improvement of intracellular GSH level and GST activity, reduced the Cd toxicity towards P. kudriavzevii. Cd efflux by YOR1 played a key role in the decline of intracellular Cd level. Acid stress obviously improved the gene expression levels and activities of antioxidant enzymes (SOD, POD, and CAT), which inhibited the Cd-induced ROS outburst and oxidative damage of proteins and membrane lipids. In addition, the enhanced expression of HSP12 protected P. kudriavzevii from the damage of Cd stress. These results provide some important clues to reconstruct robust strains using for Cd removal in aquatic environments.
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