Proteins DotY and DotZ modulate the dynamics and localization of the type IVB coupling complex of Legionella pneumophila.

Proteins DotY and DotZ modulate the dynamics and localization of the type IVB coupling complex of Legionella pneumophila.
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DOI:
10.1111/mmi.14847
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发表时间:
2022-03
影响因子:
3.6
通讯作者:
Waksman, Gabriel
Waksman, Gabriel
中科院分区:
生物学2区
文献类型:
--
作者:
Mace, Kevin;Meir, Amit;Lukoyanova, Natalya;Liu, Luying;Chetrit, David;Hospenthal, Manuela K.;Roy, Craig R.;Waksman, Gabriel

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嗜肺军团菌是一种感染肺泡巨噬细胞和原生动物的机会病原体。军团菌利用 IV 型分泌系统 (T4SS) 将 300 多种效应蛋白转移到宿主细胞中。在最近的一项研究中,我们分离并解析了 IV 型偶联复合物 (T4CC) 的冷冻电镜结构,这是一种与内膜相关的大型细胞质决定簇,可募集效应蛋白以递送至 T4SS 进行易位。 T4CC 由 DotLMNYZ 异质五聚核组成,灵活的 IcmSW 模块从该核中灵活突出。 DotY 和 DotZ 蛋白是新报道的该复合物的成员,但它们的作用仍然难以捉摸。在本研究中,我们观察了删除 DotY 和 DotZ 对 T4CC 稳定性和定位的影响。此外,我们发现这两种蛋白是相互依赖的,DotY 的缺失导致偶联复合物中 DotZ 的缺失,反之亦然。额外的冷冻电镜数据分析表明 IcmSW 模块的动态运动受到 DotY/Z 蛋白的修改。因此,我们确定了 DotY 和 DotZ 的可能功能,并揭示了它们对 T4CC 功能的重要性。 嗜肺军团菌利用 4 型分泌系统 (T4SS) 将 300 多种效应蛋白转移到宿主细胞中。这些由多蛋白复合物,即 4 型偶联复合物 (T4CC) 募集,这对于效应子结合和递送至 T4SS 至关重要。两种新发现的蛋白质 DotY 和 DotZ 先前被证明是 T4CC 的一部分,在此进一步表征,从而得出有关 T4CC 动力学、组装和细胞定位的新发现。
Legionella pneumophila is an opportunistic pathogen infecting alveolar macrophages and protozoa species. Legionella utilizes a Type IV Secretion System (T4SS) to translocate over 300 effector proteins into its host cell. In a recent study, we have isolated and solved the cryo‐EM structure of the Type IV Coupling Complex (T4CC), a large cytoplasmic determinant associated with the inner membrane that recruits effector proteins for delivery to the T4SS for translocation. The T4CC is composed of a DotLMNYZ hetero‐pentameric core from which the flexible IcmSW module flexibly protrudes. The DotY and DotZ proteins were newly reported members of this complex and their role remained elusive. In this study, we observed the effect of deleting DotY and DotZ on T4CC stability and localization. Furthermore, we found these two proteins are co‐dependent, whereby the deletion of DotY resulted in DotZ absence from the coupling complex, and vice versa. Additional cryo‐EM data analysis revealed the dynamic movement of the IcmSW module is modified by the DotY/Z proteins. We therefore determined the likely function of DotY and DotZ and revealed their importance on T4CC function. Legionella pneumophila utilizes the type 4 secretion system (T4SS) to translocate over 300 effector proteins into its host cell. These are recruited by a multiprotein complex, the type 4 coupling complex (T4CC), which is essential for effector binding and delivery to the T4SS. Two newly discovered proteins, DotY and DotZ, previously shown to be part of the T4CC, are here further characterized, leading to novel findings regarding T4CC dynamics, assembly, and cellular localization.
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