选择的肠球菌株作为益生菌的分子评估和验证
Abrar Hussain1, Saira Akram1, Diyar Ahmad1
1Third World Center for Science and Technology, H.E.J. Research Institute of Chemistry, University of Karachi, Karachi, 75270, Pakistan.
Probiotics and antimicrobial proteins
|September 21, 2023
概括
这项研究确定了11种来自局部Enterococci分离的有前途的益生菌菌株. 这些菌株没有表现出毒性因子或可转移的抗生素耐药性,显示出潜在的健康益处.
科学领域:
- 微生物学 微生物学
- 益生菌研究 益生菌研究
- 食品科学 食品科学 食品科学
背景情况:
- 益生菌,即带有健康益处的活微生物,对宿主健康至关重要.
- 乳酸细菌 (LAB),包括Enterococci,有使用作为益生菌的历史.
- 识别新型,安全和有效的益生菌菌株是一个持续的研究优先事项.
研究的目的:
- 从局部隔离的Enterococci菌株中选和识别潜在的益生菌候选者.
- 评估所选菌株的安全性,包括缺乏毒性特征和抗生素耐药性.
- 根据耐受性和粘附性质,评估选定菌株的益生菌潜力.
主要方法:
- 最初对122个菌株进行查,随后进行表型和基因型评估.
- 对毒性因子 (血清素,凝酶,生物膜,DNase) 和相关基因的评估.
- 抗生素耐药性分析,可转移性耐药性基因的检测,以及CRISPR-Cas分析.
- 鉴定产生素的基因 (EntP,EntB,EntA,EntQ).
- 耐受性测试 (酸,NaCl,胃汁) 和细胞粘附的评估 (自动和协同聚合).
主要成果:
- 根据安全性和耐受性标准选择了11种Enterococci菌株.
- 没有测试的菌株显示出血解素,凝酶,生物膜或DNase的产生.
- 分子分析显示,Enterococcus faecalis菌株中病毒性相关基因最小.
- 选择的菌株对十种常见的抗生素表现出敏感性,没有检测到可转移的耐药基因.
- 确定了产生氨酸的基因,菌株表现出有利的酸,NaCl和胃汁耐受性.
- 在选定的菌株中观察到有前途的自动和协同聚合特性.
结论:
- 选出的11种Enterococci菌株是安全的,并具有理想的益生菌特性.
- 这些菌株表现出对宿主状况的强大耐受性和良好的粘附潜力.
- 已识别的菌株代表了新型益生菌应用的有希望的候选人.
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