霍氏肠杆菌YT-3发酵烟草浸提液香味成分及其转录水平分析
Aroma components and transcriptome analysis of tobacco extracts fermented by Enterobacter hormaechei YT-3
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摘要: 【目的】 提升霍氏肠杆菌YT-3(Enterobacter hormaechei YT-3)发酵改善烟草浸提液香味成分能力,揭示其转化机制。【方法】 采用气相色谱-质谱(GC-MS)联用技术对发酵烟草浸提液香气组分进行定性、定量分析,利用转录组学探索YT-3发酵烟草浸提液潜在香气产生机制。【结果】 经发酵处理后,烟草浸提液香气质和香气量均显著提高,苯乙醇、乙偶姻、3-羟基-β-紫罗兰酮和巨豆三烯酮的质量浓度分别提升了55.62%、50.15%、17.81%和39.93%。转录组测序共获得1552个显著差异表达基因(DEGs),其中上调基因746个,下调基因806个;DEGs在氨基酸代谢、丁酸代谢、类胡萝卜素降解产物合成等途径上显著富集,芳醇脱氢酶(ADH)、苯乙醛脱氢酶(feaB)、α-乙酰乳酸合酶(ilv)、乙偶姻形成双乙酰还原酶(budC)、6-磷酸-β-葡萄糖苷酶(bglA)等基因与烟草浸提液中关键香味成分的生物合成密切相关。【结论】 霍氏肠杆菌YT-3能够利用烟草浸提液部分底物高效合成香味成分,为进一步改善其香气品质提供了一种新方法。
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关键词:
- 霍氏肠杆菌YT-3 /
- 烟草浸提液 /
- 香味成分 /
- 气相色谱-质谱联用技术 /
- 转录组分析
Abstract: 【Objective】 To enhance the aroma-improving capacity of Enterobacter hormaechei YT-3 fermentation on tobacco extracts and elucidate its conversion mechanism. 【Methods】 GC-MS was employed for qualitative and quantitative analysis of aroma components in fermented tobacco extracts. Transcriptomics was utilized to investigate the molecular mechanism underlying aroma production during YT-3 fermentation. 【Results】 Post-fermentation, both aroma quality and quantity of fermented tobacco extracts were significantly enhanced. The concentrations of phenylethanol, acetoin, 3-hydroxy-β-ionone, and megastigmatrienone increased by 55.62%, 50.15%, 17.81%, and 39.93%, respectively. Transcriptomic analysis identified 1552 differentially expressed genes (DEGs), comprising 746 upregulated and 806 downregulated genes. DEGs showed significant enrichment in pathways including amino acid metabolism, butyric acid metabolism, and carotenoid degradation product synthesis. Genes such as aryl alcohol dehydrogenase (ADH), phenylacetaldehyde dehydrogenase (feaB), α-acetyl lactate synthase (ilv), acetoin-forming diacetyl reductase (budC), and 6-phosphate-β-glucosidase (bglA) are critically involved in the biosynthesis of key aroma components in fermented tobacco extracts. 【Conclusion】 E.hormaechei YT-3 efficiently synthesizes aroma components using substrates in tobacco extracts, providing a novel approach to further enhance aroma quality. -
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