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菌根细菌的结构和功能分析氨酸脱硫酶载入的囊素

Yanting Tang¹, Yanyan Liu¹, Mingjing Zhang²

¹College of Life Sciences, State Key Laboratory of Medicinal Chemical Biology, Frontiers Science Center for Cell Responses, Nankai University, Tianjin, China.

Communications biology

|December 20, 2024

概括

封装蛋白纳米隔间,如Mmp1装载有氨酸脱硫酶 (Enc-CD),保护载荷蛋白. 这项研究揭示了Mmp1封装素系统.

科学领域:

*分子生物学和结构生物学.
* 生物化学和生物物理学.
* 微生物学和传染病.

背景情况:

* 囊素是参与诸如抗压和生物合成等细胞过程的蛋白质纳米区.
*2家族囊素,包括Mmp1和囊脱硫酶 (Enc-CD),是丰富的,但不太了解.
*Mmp1封装素系统的组装,机制和功能需要详细的研究.

研究的目的:

* 来隔离和描述Enc-CD装载的Mmp1囊系统从Mycobacterium smegmatis中.
* 确定Mmp1封装组件和Enc-CD加载的结构基础.
* 阐明Mmp1囊对其货物的保护作用.

主要方法:

* Mmp1囊系统的隔离和净化.
*冷电子显微镜 (cryo-EM) 用于Mmp1封装蛋白结构的确定.
*X射线晶体学用于裸体Enc-CD结构的确定.
* 生物化学测定以评估货物保护.

主要成果:

* 确定了Mmp1封装素 (T=1) 在2.60 Å和 homodecamer 在2.69 Å的冷-EM结构.
* 确定了2.10 Å的二维Enc-CD的晶体结构.
* 证明Mmp1封装素保护Enc-CD免受氧化,并保持其稳定性.
* 识别了Enc-CD中介载入Mmp1纳米隔间的N端无序区域.

结论:

*Mmp1封闭素系统保护氨酸脱硫酶 (Enc-CD),促进硫储存在Mycobacterium smegmatis中.
*对Mmp1-Enc-CD相互作用的结构洞察力为开发新型抗菌菌疗法提供了基础.
* 这项工作增强了对封装纳米隔间功能和货物装载机制的理解.

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