8WV4

C-reactive protein, pentamer

8WV4 の概要

• エントリーDOI: 10.2210/pdb8wv4/pdb
• EMDBエントリー: 37864
• 分子名称: C-reactive protein(1-205), CALCIUM ION (2 entities in total)
• 機能のキーワード: pentraxin, immune system, acute-phase reactant
• 由来する生物種: Homo sapiens (human)
• タンパク質・核酸の鎖数: 5
• 化学式量合計: 125708.16

構造登録者

Yadav, S.,Vinothkumar, K.R. (登録日: 2023-10-23, 公開日: 2024-07-17, 最終更新日: 2024-10-23)

主引用文献

Yadav, S.,Vinothkumar, K.R.
Factors affecting macromolecule orientations in thin films formed in cryo-EM.
Acta Crystallogr D Struct Biol, 80:535-550, 2024

PubMed Abstract: The formation of a vitrified thin film embedded with randomly oriented macromolecules is an essential prerequisite for cryogenic sample electron microscopy. Most commonly, this is achieved using the plunge-freeze method first described nearly 40 years ago. Although this is a robust method, the behaviour of different macromolecules shows great variation upon freezing and often needs to be optimized to obtain an isotropic, high-resolution reconstruction. For a macromolecule in such a film, the probability of encountering the air-water interface in the time between blotting and freezing and adopting preferred orientations is very high. 3D reconstruction using preferentially oriented particles often leads to anisotropic and uninterpretable maps. Currently, there are no general solutions to this prevalent issue, but several approaches largely focusing on sample preparation with the use of additives and novel grid modifications have been attempted. In this study, the effect of physical and chemical factors on the orientations of macromolecules was investigated through an analysis of selected well studied macromolecules, and important parameters that determine the behaviour of proteins on cryo-EM grids were revealed. These insights highlight the nature of the interactions that cause preferred orientations and can be utilized to systematically address orientation bias for any given macromolecule and to provide a framework to design small-molecule additives to enhance sample stability and behaviour.

PubMed: 38935342
DOI: 10.1107/S2059798324005229

実験手法

ELECTRON MICROSCOPY (3.3 Å)