来自黑海地毯的甲基-辅酶M减少酶的结构,这些地毯无氧氧化甲
Seigo Shima1, Martin Krueger, Tobias Weinert
1Max Planck Institute for Terrestrial Microbiology, Karl-Frisch-Strasse 10, D-35043 Marburg, Germany. shima@mpi-marburg.mpg.de
Nature
|November 29, 2011
概括
研究人员阐明了甲氧化甲 (AOM) 的甲激活酶的结构. 这种酶,ANME-1 MCR,与其甲原性对应物共享基质,但具有不同的特征.
科学领域:
- 微生物学和生物化学
- 结构生物学 结构生物学
- 生物地质化学生物地质化学
背景情况:
- 甲 (AOM) 与硫酸盐的无氧氧化是一种关键的微生物过程,由无氧甲类古生物 (ANME) 和减少硫酸盐的细菌组成的联盟驱动.
- 负责ANME古生物中的甲激活的酶被认为是甲基辅酶M减少酶 (MCR) 的同类物,也存在于甲原古生物中.
研究的目的:
- 为了确定ANME-1 MCR复合体的X射线结构.
- 了解AOM中甲激活的结构基础.
- 为了比较ANME-1 MCR与甲原性古生物的MCR.
主要方法:
- 从黑海收集的微生物联盟中净化ANME-1 MCR.
- 在280kDa的ANME-1 MCR复合体中结晶.
- 进行X射线衍射分析以确定2.1 Å分辨率的结构.
主要成果:
- 成功确定了ANME-1 MCR复合体的X射线结构.
- 发现ANME-1 MCR与辅酶M和辅酶B及其基质复合在一起.
- 与甲原性MCR相比,确定了关键的结构差异,包括F430修饰,富含氨酸的补丁和改变的翻译后修饰.
结论:
- 这项研究为ANME古物中的甲激活酶提供了第一个结构洞察力.
- 鉴定到的结构变化表明,ANME-1 MCR应适应其在AOM中的作用.
- 这些发现提升了我们对微生物甲循环和酶进化的理解.
更多相关视频
相关概念视频
01:12Carbon Skeletons
84.6K
Life on Earth is carbon-based, as all macromolecules that make up living organisms contain carbon atoms. All organic compounds have a carbon backbone. Each carbon atom is tetravalent and can bond with four other atoms, making it an extraordinarily flexible component of biological molecules. Because carbon’s valence electrons are stable, it rarely becomes an ion. As the carbon chain increases in length, structural modifications such as ring structures, double bonds, and branching side...
84.6K
01:45Destabilization of Microtubules
2.9K
The destabilization of microtubules can occur during different stages of the microtubule lifecycle, such as nucleation or elongation. It can take place at either end of the microtubule or in the microtubule lattices as a whole. The lifespan of individual microtubules within a cell varies according to the cell type and stage of the cell cycle. During interphase, the lifespan of the microtubule is about 30 minutes, while during cell division, it is about 15 minutes. In axonal microtubules of...
2.9K
01:23Role of Matrix Metalloproteases in Degradation of ECM
2.9K
Matrix metalloproteases (MMPs) are enzymes involved in the hydrolysis of proteins and glycoproteins of the extracellular matrix. MMPs are essential for the migration and proliferation of cells through the dense matrix network, throughout embryonic development, and throughout morphogenesis. The first MMP activity discovered was a collagenase in a tadpole's tail undergoing metamorphosis. The active collagen deposition and modifications lead to the morphogenesis of tadpoles into the adult...
2.9K
01:18Amino Acid Catabolism
1.7K
Microorganisms rely on proteins as an essential carbon and energy source, particularly in environments with limited polysaccharides or lipids. However, proteins are too large to cross the plasma membrane unaided, necessitating enzymatic degradation. Microbes secrete extracellular proteases and peptidases that hydrolyze proteins into peptides, which can then be transported across the membrane. Once inside the cell, intracellular proteases degrade these peptides into free amino acids, which...
1.7K
01:25Microbial Mats
67
Microbial communities forming biofilms and mats represent complex, spatially structured ecosystems where metabolic processes are stratified according to light, oxygen, and nutrient gradients. Biofilms are initial colonization stages, only a few millimeters thick, while mature microbial mats can reach centimeter-scale thickness and display intricate vertical organization. Their structural and functional heterogeneity allows microorganisms to occupy distinct ecological niches within a few...
67
01:18Deep Sea Microbial Ecology
53
The deep ocean and its underlying sediments represent vast, largely unexplored microbial habitats that extend far beyond the sunlit photic zone. The photic (euphotic) zone typically spans the upper ~100–200 meters of pelagic waters in the open ocean, but its depth varies geographically and seasonally, where sufficient light supports photosynthetic life. Below this lies the deep sea, spanning roughly 1000–6000 meters (bathypelagic to abyssal zones), with deeper hadal trenches...
53