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Chen YZ, Rong WT, Qin YC, Lu LY, Liu J, Li MJ, Xin L, Li XD, Guan DL. Integrative analysis of microbiota and metabolomics in chromium-exposed silkworm ( Bombyx mori) midguts based on 16S rDNA sequencing and LC/MS metabolomics. Front Microbiol 2023; 14:1278271. [PMID: 37954243 PMCID: PMC10635416 DOI: 10.3389/fmicb.2023.1278271] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2023] [Accepted: 09/27/2023] [Indexed: 11/14/2023] Open
Abstract
The gut microbiota, a complex ecosystem integral to host wellbeing, is modulated by environmental triggers, including exposure to heavy metals such as chromium. This study aims to comprehensively explore chromium-induced gut microbiota and metabolomic shifts in the quintessential lepidopteran model organism, the silkworm (Bombyx mori). The research deployed 16S rDNA sequence analysis and LC/MS metabolomics in its experimental design, encompassing a control group alongside low (12 g/kg) and high (24 g/kg) feeding chromium dosing regimens. Considerable heterogeneity in microbial diversity resulted between groups. Weissella emerged as potentially resilient to chromium stress, while elevated Propionibacterium was noted in the high chromium treatment group. Differential analysis tools LEfSe and random forest estimation identified key species like like Cupriavidus and unspecified Myxococcales, offering potential avenues for bioremediation. An examination of gut functionality revealed alterations in the KEGG pathways correlated with biosynthesis and degradation, suggesting an adaptive metabolic response to chromium-mediated stress. Further results indicated consequential fallout in the context of metabolomic alterations. These included an uptick in histidine and dihydropyrimidine levels under moderate-dose exposure and a surge of gentisic acid with high-dose chromium exposure. These are critical players in diverse biological processes ranging from energy metabolism and stress response to immune regulation and antioxidative mechanisms. Correlative analyses between bacterial abundance and metabolites mapped noteworthy relationships between marker bacterial species, such as Weissella and Pelomonas, and specific metabolites, emphasizing their roles in enzyme regulation, synaptic processes, and lipid metabolism. Probiotic bacteria showed robust correlations with metabolites implicated in stress response, lipid metabolism, and antioxidant processes. Our study reaffirms the intricate ties between gut microbiota and metabolite profiles and decodes some systemic adaptations under heavy-metal stress. It provides valuable insights into ecological and toxicological aspects of chromium exposure that can potentially influence silkworm resilience.
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Affiliation(s)
- Ya-Zhen Chen
- Guangxi Key Laboratory of Sericulture Ecology and Applied Intelligent Technology, Hechi University, Hechi, China
- Guangxi Collaborative Innovation Center of Modern Sericulture and Silk, Hechi University, Hechi, China
| | - Wan-Tao Rong
- Guangxi Key Laboratory of Sericulture Ecology and Applied Intelligent Technology, Hechi University, Hechi, China
- Guangxi Collaborative Innovation Center of Modern Sericulture and Silk, Hechi University, Hechi, China
| | - Ying-Can Qin
- Guangxi Key Laboratory of Sericulture Ecology and Applied Intelligent Technology, Hechi University, Hechi, China
- Guangxi Collaborative Innovation Center of Modern Sericulture and Silk, Hechi University, Hechi, China
| | - Lin-Yuan Lu
- Guangxi Key Laboratory of Sericulture Ecology and Applied Intelligent Technology, Hechi University, Hechi, China
- Guangxi Collaborative Innovation Center of Modern Sericulture and Silk, Hechi University, Hechi, China
| | - Jing Liu
- Guangxi Key Laboratory of Sericulture Ecology and Applied Intelligent Technology, Hechi University, Hechi, China
- Guangxi Collaborative Innovation Center of Modern Sericulture and Silk, Hechi University, Hechi, China
| | - Ming-Jie Li
- Guangxi Key Laboratory of Sericulture Ecology and Applied Intelligent Technology, Hechi University, Hechi, China
- Guangxi Collaborative Innovation Center of Modern Sericulture and Silk, Hechi University, Hechi, China
| | - Lei Xin
- Guangxi Key Laboratory of Sericulture Ecology and Applied Intelligent Technology, Hechi University, Hechi, China
- Guangxi Collaborative Innovation Center of Modern Sericulture and Silk, Hechi University, Hechi, China
| | - Xiao-Dong Li
- Guangxi Key Laboratory of Sericulture Ecology and Applied Intelligent Technology, Hechi University, Hechi, China
- Guangxi Collaborative Innovation Center of Modern Sericulture and Silk, Hechi University, Hechi, China
| | - De-Long Guan
- Guangxi Key Laboratory of Sericulture Ecology and Applied Intelligent Technology, Hechi University, Hechi, China
- Guangxi Collaborative Innovation Center of Modern Sericulture and Silk, Hechi University, Hechi, China
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Wang L, Ding MY, Wang J, Gao JG, Liu RM, Li HT. Effects of Site-Directed Mutagenesis of Cysteine on the Structure of Sip Proteins. Front Microbiol 2022; 13:805325. [PMID: 35572629 PMCID: PMC9100928 DOI: 10.3389/fmicb.2022.805325] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2021] [Accepted: 02/22/2022] [Indexed: 11/16/2022] Open
Abstract
Bacillus thuringiensis, a gram-positive bacteria, has three insecticidal proteins: Vip (vegetative insecticidal protein), Cry (crystal), and Sip (secreted insecticidal protein). Of the three, Sip proteins have insecticidal activity against larvae of Coleoptera. However, the Sip1Aa protein has little solubility in the supernatant because of inclusion bodies. This makes it more difficult to study, and thus research on Sip proteins is limited, which hinders the study of their mechanistic functions and insecticidal mechanisms. This highlights the importance of further investigation of the Sip1Aa protein. Disulfide bonds play an important role in the stability and function of proteins. Here, we successfully constructed mutant proteins with high insecticidal activity. The tertiary structure of the Sip1Aa protein was analyzed with homologous modeling and bioinformatics to predict the conserved domain of the protein. Cysteine was used to replace amino acids via site-directed mutagenesis. We successfully constructed Sip149-251, Sip153-248, Sip158-243, and Sip178-314 mutant proteins with higher solubility than Sip1Aa. Sip153-248 and Sip158-243 were the most stable compared to Sip1Aa, followed by Sip149-251 and Sip178-314. The insecticidal activity of Sip153-248 (Sip158-243) was 2.76 (2.26) times higher than that of Sip1Aa. The insecticidal activity of Sip149-251 and Sip178-314 did not differ significantly from that of Sip1Aa. Basic structural properties, physicochemical properties, and the spatial structure of the mutation site of Sip1Aa and the mutant proteins were analyzed. These results provide a molecular basis for using Sip1Aa to control Coleopteran insects and contribute to the study of the Sip1Aa insecticidal mechanism.
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Affiliation(s)
- Lin Wang
- College of Life Science, Northeast Agricultural University, Harbin, China
| | - Ming-Yue Ding
- College of Life Science, Northeast Agricultural University, Harbin, China
| | - Jing Wang
- College of Life Science, Northeast Agricultural University, Harbin, China
| | - Ji-Guo Gao
- College of Life Science, Northeast Agricultural University, Harbin, China
- *Correspondence: Ji-Guo Gao,
| | - Rong-Mei Liu
- College of Life Science, Northeast Agricultural University, Harbin, China
| | - Hai-Tao Li
- College of Life Science, Northeast Agricultural University, Harbin, China
- State Key Laboratory for Biology of Plant Diseases and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing, China
- Hai-Tao Li,
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