5D97

Neutron crystal structure of H2O-solvent ribonuclease A

5D97 の概要

• エントリーDOI: 10.2210/pdb5d97/pdb
• 関連するPDBエントリー: 4ZZ4 5D6U
• 分子名称: Ribonuclease pancreatic, ISOPROPYL ALCOHOL (3 entities in total)
• 機能のキーワード: ribonuclease a, d/h contrast, hydrolase
• 由来する生物種: Bos taurus (Bovine)
• タンパク質・核酸の鎖数: 1
• 化学式量合計: 13768.42

構造登録者

Chatake, T.,Fujiwara, S. (登録日: 2015-08-18, 公開日: 2016-04-06, 最終更新日: 2024-11-20)

主引用文献

Chatake, T.,Fujiwara, S.
A technique for determining the deuterium/hydrogen contrast map in neutron macromolecular crystallography
Acta Crystallogr D Struct Biol, 72:71-82, 2016

PubMed Abstract: A difference in the neutron scattering length between hydrogen and deuterium leads to a high density contrast in neutron Fourier maps. In this study, a technique for determining the deuterium/hydrogen (D/H) contrast map in neutron macromolecular crystallography is developed and evaluated using ribonuclease A. The contrast map between the D2O-solvent and H2O-solvent crystals is calculated in real space, rather than in reciprocal space as performed in previous neutron D/H contrast crystallography. The present technique can thus utilize all of the amplitudes of the neutron structure factors for both D2O-solvent and H2O-solvent crystals. The neutron D/H contrast maps clearly demonstrate the powerful detectability of H/D exchange in proteins. In fact, alternative protonation states and alternative conformations of hydroxyl groups are observed at medium resolution (1.8 Å). Moreover, water molecules can be categorized into three types according to their tendency towards rotational disorder. These results directly indicate improvement in the neutron crystal structure analysis. This technique is suitable for incorporation into the standard structure-determination process used in neutron protein crystallography; consequently, more precise and efficient determination of the D-atom positions is possible using a combination of this D/H contrast technique and standard neutron structure-determination protocols.

PubMed: 26894536
DOI: 10.1107/S2059798315021269

実験手法

NEUTRON DIFFRACTION (1.8 Å)