细菌 Actinobacillus seminis DnaK 与牛的转激素,乳酸铁素和血红蛋白相互作用,作为一种假定的铁获取机制
Candelario Vazquez-Cruz1, Edmundo Reyes-Malpica2, J Fernando Montes-García2
1Centro de Investigaciones en Ciencias Microbiológicas, BUAP, Apdo. Postal1622,, Puebla, México.
Folia microbiologica
|May 10, 2025
概括
雌性杆菌 (Actinobacilus seminis) 是导致绵羊皮膜炎的一种病因,它利用特定的铁获取机制,包括一种转激素结合蛋白和DnaK,在铁限制下生存. 这些适应性可能有助于它感染各种宿主组织的能力.
科学领域:
- 微生物学 微生物学
- 动物科学动物科学
- 生物化学 生物化学
背景情况:
- 绵羊上腺炎是由Actinobacilus seminis引起的,导致丸缩,降低生育能力和绵羊不育.
- 铁对微生物生长至关重要,了解Actinobacilus seminis的铁获取对于疾病管理至关重要.
研究的目的:
- 为了研究 Actinobacilus seminis 在缺乏铁的条件下使用的铁获取机制.
- 为了确定参与铁吸收的蛋白质及其在细菌毒性中的作用.
主要方法:
- 用铁合剂和补充剂进行细菌生长测定.
- 蛋白质组分析 (蛋白质的上下表达).
- 用于蛋白质鉴定 (DnaK) 的质谱和与铁结合蛋白的相互作用研究.
主要成果:
- 在铁的限制下,Actinobacilus seminis增加了一种转激素结合蛋白的表达,并减少了七种蛋白质 (酶,粘合素) 的表达.
- 通过铁化,细菌生长减少了40%,但通过FeCl3.3恢复了.
- 没有检测到 siderophore 生产,但 siderophore 载体存在.
- 鉴定了DnaK蛋白 (70kDa),并表明它能结合转移素,乳酸铁素和血红蛋白,这表明它在铁的获取中起着作用.
- 在铁限制下,DnaK表达在37°C下降,但在40°C下降并没有,并被羊血清识别出来.
结论:
- 种类 Actinobacilus seminis 采用多种铁获取策略,包括转激素结合和可能通过 DnaK 介导的铁吸收.
- 细菌的铁获取机制取决于温度,可能涉及 siderophore 载体.
- 这些多样化的机制可能有助于病原体感染不同宿主组织的能力,并导致绵羊表膜炎.
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