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首页> 外文期刊>Journal of bacteriology >Lactococcus lactis Metabolism and Gene Expression during Growth on Plant Tissues
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Lactococcus lactis Metabolism and Gene Expression during Growth on Plant Tissues

机译:乳酸乳球菌在植物组织生长过程中的代谢和基因表达

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Lactic acid bacteria have been isolated from living, harvested, and fermented plant materials; however, the adaptations these bacteria possess for growth on plant tissues are largely unknown. In this study, we investigated plant habitat-specific traits of Lactococcus lactis during growth in an Arabidopsis thaliana leaf tissue lysate (ATL). L. lactis KF147, a strain originally isolated from plants, exhibited a higher growth rate and reached 7.9-fold-greater cell densities during growth in ATL than the dairy-associated strain L. lactis IL1403. Transcriptome profiling (RNA-seq) of KF147 identified 853 induced and 264 repressed genes during growth in ATL compared to that in GM17 laboratory culture medium. Genes induced in ATL included those involved in the arginine deiminase pathway and a total of 140 carbohydrate transport and metabolism genes, many of which are involved in xylose, arabinose, cellobiose, and hemicellulose metabolism. The induction of those genes corresponded with L. lactis KF147 nutrient consumption and production of metabolic end products in ATL as measured by gas chromatography-time of flight mass spectrometry (GC-TOF/MS) untargeted metabolomic profiling. To assess the importance of specific plant-inducible genes for L. lactis growth in ATL, xylose metabolism was targeted for gene knockout mutagenesis. Wild-type L. lactis strain KF147 but not an xylA deletion mutant was able to grow using xylose as the sole carbon source. However, both strains grew to similarly high levels in ATL, indicating redundancy in L. lactis carbohydrate metabolism on plant tissues. These findings show that certain strains of L. lactis are well adapted for growth on plants and possess specific traits relevant for plant-based food, fuel, and feed fermentations.
机译:乳酸菌是从活的,收获的和发酵的植物材料中分离出来的。然而,这些细菌对植物组织生长的适应性在很大程度上尚不清楚。在这项研究中,我们调查了拟南芥叶组织裂解液(ATL)生长过程中乳酸乳球菌的植物栖息地特定性状。乳酸乳球菌KF147,最初从植物中分离出来的菌株,在ATL生长期间的生长速率比乳业相关的乳酸乳球菌IL1403更高,并且达到了7.9倍的细胞密度。与GM17实验室培养基相比,KF147的转录组图谱(RNA-seq)在ATL生长期间鉴定出853个诱导基因和264个被抑制基因。在ATL中诱导的基因包括与精氨酸脱亚氨酶途径有关的基因和总共140个碳水化合物转运和代谢基因,其中许多与木糖,阿拉伯糖,纤维二糖和半纤维素代谢有关。通过气相色谱-飞行时间质谱(GC-TOF / MS)非目标代谢组学分析测量,这些基因的诱导与乳酸乳球菌KF147的营养消耗和ATL代谢终产物的产生相对应。为了评估特定植物诱导性基因对ATL中乳酸乳球菌生长的重要性,将木糖代谢靶向基因敲除诱变。使用木糖作为唯一碳源,野生型乳酸乳球菌菌株KF147却不能生长 xylA 缺失突变体。但是,两种菌株的ATL均增长至相似的高水平,表明植物组织上乳酸乳杆菌碳水化合物代谢的冗余。这些发现表明,乳酸乳球菌的某些菌株非常适合在植物上生长,并具有与基于植物的食物,燃料和饲料发酵相关的特定性状。

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