在Mycobacterium tuberculosis中对三种MoaE蛋白的结构比较:洞察莫利布多丁合成酶组合和特异性
Hyo Je Cho1, Seung Hyeon Yang1, Hyun-Shik Lee2
1Department of Biological Sciences and Biotechnology, Chungbuk National University, Cheongju, 28644, Republic of Korea.
概括
结核菌菌需要辅因子 (MoCo) 才能生存. 这项研究揭示了MoaE蛋白质如何与MoaD伙伴相互作用,形成功能性二氨酸合成酶复合体,这对MoCo生物合成至关重要.
科学领域:
- 生物化学 生物化学
- 结构生物学 结构生物学
- 微生物学 微生物学
背景情况:
- 酶对于Mycobacterium结核病的生存和致病性至关重要,需要辅因子 (MoCo).
- 二丁 (MPT) 合成酶对于MoCo生物合成至关重要,包括MoaD和MoaE子单元.
- 结核菌具有多个MoaE和MoaD同类,但它们的特定相互作用和功能作用尚不清楚.
研究的目的:
- 阐明M.结核病中MoaE和MoaD蛋白之间的功能特异性和相互作用动态的结构基础.
- 了解MoaE结构的变化如何影响它们组装成功能MPT合成酶复合体.
主要方法:
- 确定了所有三种M.结核病MoaE蛋白质的晶体结构.
- 使用拉下测试来研究不同MoaE和MoaD同类物之间的结合特异性.
主要成果:
- 这三种MoaE蛋白都具有保留的α/β头折叠,细微的序列变化产生了不同的结合接口.
- MoaE2和MoaXE对其特定的MoaD合作伙伴表现出选择性的绑定.
- MoaE1对所有 MoaD 形式表现出乱交的结合,但这种结构性可塑性可能导致酶性无活化.
结论:
- MoaE蛋白质的结构特征和结合特异性决定了M.结核病中功能MPT合成酶复合物的组装.
- 了解这些分子决定因素是理解MoCo生物合成及其在M.结核病发病过程中的作用的关键.
相关概念视频
01:57Gene Families
8.7K
Gene families consist of groups of genes proposed to have originated from a common ancestor. Typically these arise through events in which a gene or genes are mistakenly duplicated during cell division. Unlike their parent genes (which are subject to selection pressure to maintain function), these gene copies do not need to preserve their sequences and may evolve at a relatively faster rate.
Occasionally these regions can be adapted to take on new roles within the organism, becoming novel genes...
Occasionally these regions can be adapted to take on new roles within the organism, becoming novel genes...
8.7K
02:21Globular and Fibrous Proteins
43.0K
Many proteins can be classified into two distinct subtypes - globular or fibrous. These two types differ in their shapes and solubilities.
Globular proteins are also known as spheroproteins and typically are approximately round in shape. They contain a mix of amino acid types and contain differing sequences in their primary structures. Globular proteins have many different functions, such as enzymes, cellular messengers, and molecular transporters. These roles often require the proteins to be...
Globular proteins are also known as spheroproteins and typically are approximately round in shape. They contain a mix of amino acid types and contain differing sequences in their primary structures. Globular proteins have many different functions, such as enzymes, cellular messengers, and molecular transporters. These roles often require the proteins to be...
43.0K
01:29Cytoskeletal Proteins in Bacteria
3.2K
Bacterial cells were initially considered simple, randomly organized structures lacking a cytoskeleton. However, the discovery of cytoskeleton homologs in bacteria led to the change of this opinion. Bacterial cytoskeletal filaments regulate the cell shape, cell polarity, cell division, and partitioning of plasmids during cell division. It was later discovered that bacterial cytoskeletal proteins, mainly actin and tubulin homologs, are diverse compared to their eukaryotic counterparts. On the...
3.2K
01:21Structure of Porins
2.8K
Mitochondria, chloroplasts, and gram-negative bacteria have transmembrane, beta-barrel proteins called porins to mediate the free diffusion of ions and metabolites across the membrane. Mitochondrial porin precursors contain conserved amino acid sequences called beta signals at their C-terminal. Beta signals have a motif of PoXGXXHyXHy (Po-Polar, X-Any amino acid, G-Glycine, Hy-LargeHydrophobic), which are crucial for precursor recognition to initiate precursor assembly. Beta-barrel...
2.8K