对B型和E型Pasteurella multocida和结构相关的囊型多糖体进行了形态比较
Nicole I Richardson1, Neil Ravenscroft1, Michelle M Kuttel2
1Department of Chemistry, University of Cape Town, Rondebosch 7701, South Africa.
Glycobiology
|June 19, 2023
概括
帕斯图雷拉多达血清组B和E引起重要的牲畜疾病. 它们的囊多糖 (CPS) 的结构差异影响抗体结合,这表明需要双价疫苗才能有效地保护.
科学领域:
- 兽医微生物学 兽医微生物学
- 免疫学 免疫学 免疫学
- 结构生物学 结构生物学
背景情况:
- 帕斯托雷拉多种菌 (Pasteurella multocida) 是一种主要的兽医病原体,在全球范围内造成重大牲畜损失.
- 目前针对P. multocida的全细胞疫苗的疗效有限.
- 囊多糖 (CPS) 是关键的毒性因素和有希望的疫苗点.
研究的目的:
- 调查P. multocida血清组B和E囊多糖体 (CPS) 的结构基础.
- 将P. multocida CPS与Haemophilus influenzae CPS进行比较,以了解免疫逃避策略.
- 为了帮助开发改进的,潜在的双价,基于CPS的疫苗.
主要方法:
- 对P. multocida血清组B和E的CPS重复单元结构的阐明.
- 对P. multocida (血清组B,E) 和H. influenzae (类型e,d) 的比较分子建模.
- 分析结构差异及其对潜在抗体结合表位的影响.
主要成果:
- P. multocida 血清组 B 和 E 具有共同的 CPS 骨干,但在甘氨酸链接和侧链 (果黄和甘氨酸) 上有所不同.
- 结构变异显著改变CPS链形状和暴露的抗体结合表位.
- 果黄和甘氨酸侧链可能会屏蔽免疫性CPS骨干,促进免疫逃避.
结论:
- 在CPS中,微小的结构差异显著影响抗原性和免疫识别.
- 鉴定到的结构变异表明B和E血清组之间的交叉反应性有限.
- 基于CPS的双价疫苗可能需要针对P. multocida B和E血清组,以获得广泛的保护.
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