与BLOC-one相关的异种-八种美式复合体的结构和组装
Xuan Ge1, Jinqi Ren2, Kewei Gu1
1Key Laboratory of Biomacromolecules (CAS), National Laboratory of Biomacromolecules, CAS Center for Excellence in Biomacromolecules, Institute of Biophysics, Chinese Academy of Sciences, 15 Datun Road, Beijing 100101, China; College of Life Sciences, University of Chinese Academy of Sciences, Beijing 100049, China.
Structure (London, England : 1993)
|December 31, 2024
概括
BLOC-one相关复合体 (BORC) 形成了一个棒状结构,对囊泡运输至关重要. 研究人员阐明了它的组装以及它如何招募ARL8,揭示了细胞功能至关重要的层次过程.
科学领域:
- 细胞生物学 细胞生物学
- 结构生物学 结构生物学
- 分子机制的分子机制
背景情况:
- BLOC-one相关综合体 (BORC) 是一个由八个子单元组成的综合体,调节了 lysosomal 和 synaptic 囊泡的传输.
- BORC的功能包括招募小GTPaseARL8,但其结构基础是未知的.
- 了解BORC的结构和组合是解读其生物作用的关键.
研究的目的:
- 为了确定BORC组装的结构机制.
- 阐明BORC如何与ARL8.8相互作用并激活ARL8.
- 为了提供一个结构模型的异种-octameric BORC复合体.
主要方法:
- 在体外复制BORC复合物.
- 冷电子显微镜和结构建模.
- 生物化学试验用于研究亚单元相互作用和ARL8结合.
主要成果:
- BORC形成了一个延伸的,棒状结构,由两个四个子单元半复合体组成,端到端连接.
- 观察到等级组合,其中BORCS1/2/3/5形成了一个核心支架.
- ARL8关联主要由BORCS5调解,并取决于适当的BORC组合.
结论:
- 该研究揭示了BORC综合体的详细结构和层次组装路径.
- BORC的结构模型为ARL8的招聘和激活提供了洞察力.
- 这些发现为了解BORC介导的囊泡贩运在健康和疾病方面提供了基础.
相关概念视频
Protein Complex Assembly
10.5K
Proteins can form homomeric complexes with another unit of the same protein or heteromeric complexes with different types. Most protein complexes self-assemble spontaneously via ordered pathways, while some proteins need assembly factors that guide their proper assembly. Despite the crowded intracellular environment, proteins usually interact with their correct partners and form functional complexes.
Many viruses self-assemble into a fully functional unit using the infected host cell to...
Many viruses self-assemble into a fully functional unit using the infected host cell to...
10.5K
Assembly of Signaling Complexes
5.7K
Multiprotein signaling complexes are formed in a dynamic process involving protein-protein interactions at the cytoplasmic domain of transmembrane receptors or enzymatic and non-enzymatic proteins associated with the receptor. These complexes ensure the activation and propagation of intracellular signals that regulate cell functions.
Interaction domains in cell signaling
Interaction domains recognize exposed features of their binding partners containing post-translationally modified sequences,...
Interaction domains in cell signaling
Interaction domains recognize exposed features of their binding partners containing post-translationally modified sequences,...
5.7K
Protein Complexes with Interchangeable Parts
2.5K
Groups of proteins may form a complex where each protein in this complex has a different role in the overall execution of the complex’s function. Often some of the proteins in the complex can be replaced by a closely related variant to give a complex that contains many of the same components yet is functionally distinct.
The SCF ubiquitin ligase is a protein complex of five individual proteins. This complex attaches ubiquitin to other target proteins to mark them for degradation. In order...
The SCF ubiquitin ligase is a protein complex of five individual proteins. This complex attaches ubiquitin to other target proteins to mark them for degradation. In order...
2.5K
Assembly of Complex Microtubule Structures
1.8K
Complex microtubule structures are present in resting cells and in dividing cells. In resting cells, they are responsible for maintaining the cellular architecture, tracks for intracellular transport, positioning of organelles, assembly of cilia and flagella. They mediate the bipolar spindle assembly for chromosomal segregation and positioning of the cell division plate in dividing cells. The formation of microtubule complex structures depends on the cell type, cell stage, and cell function.
1.8K
The Nucleosome Core Particle
862
Nucleosomes are the DNA-histone complex, where the DNA strand is wound around the histone core. The histone core is an octamer containing two copies of H2A, H2B, H3, and H4 histone proteins.
Nucleosomes, paradoxically, perform two opposite functions simultaneously. On the one hand, their primary aim is to protect the delicate DNA strands from physical damage and help achieve a higher compaction ratio. On the other hand, they must allow polymerase enzymes to access histone-bound DNA during...
Nucleosomes, paradoxically, perform two opposite functions simultaneously. On the one hand, their primary aim is to protect the delicate DNA strands from physical damage and help achieve a higher compaction ratio. On the other hand, they must allow polymerase enzymes to access histone-bound DNA during...
862
Assembly of Cytoskeletal Filaments
17.4K
Cytoskeletal filaments are polymeric forms of smaller protein subunits. However, individual cytoskeletal filaments may easily disassemble or associate with other similar filaments to form rigid structures. Microfilaments, made of actin monomers, rely on actin-binding proteins to form bundles and create networks of individual actin filaments. Microtubules rely on microtubule-associated proteins (MAPs) to form sturdy cylindrical structures. However, the proteins involved in forming complex...
17.4K


