6EEX

L-GSTSTA from degenerate octameric repeats in InaZ, residues 707-712

6EEX の概要

• エントリーDOI: 10.2210/pdb6eex/pdb
• 分子名称: L-GSTSTA from ice nucleaction protein, inaZ (2 entities in total)
• 機能のキーワード: amyloid, racemic, ice nucleation, microed, inaz, pseudomonas syringae, protein fibril
• 由来する生物種: Pseudomonas syringae
• タンパク質・核酸の鎖数: 1
• 化学式量合計: 522.51

構造登録者

Zee, C.,Glynn, C.,Gallagher-Jones, M.,Miao, J.,Santiago, C.G.,Cascio, D.,Gonen, T.,Sawaya, M.R.,Rodriguez, J.A. (登録日: 2018-08-15, 公開日: 2019-04-03, 最終更新日: 2024-03-13)

主引用文献

Zee, C.T.,Glynn, C.,Gallagher-Jones, M.,Miao, J.,Santiago, C.G.,Cascio, D.,Gonen, T.,Sawaya, M.R.,Rodriguez, J.A.
Homochiral and racemic MicroED structures of a peptide repeat from the ice-nucleation protein InaZ.
IUCrJ, 6:197-205, 2019

PubMed Abstract: The ice-nucleation protein InaZ from contains a large number of degenerate repeats that span more than a quarter of its sequence and include the segment GSTSTA. structures of this repeat segment, resolved to 1.1 Å by microfocus X-ray crystallography and to 0.9 Å by the cryo-EM method MicroED, were determined from both racemic and homochiral crystals. The benefits of racemic protein crystals for structure determination by MicroED were evaluated and it was confirmed that the phase restriction introduced by crystal centrosymmetry increases the number of successful trials during the phasing of the electron diffraction data. Both homochiral and racemic GSTSTA form amyloid-like protofibrils with labile, corrugated antiparallel β-sheets that mate face to back. The racemic GSTSTA protofibril represents a new class of amyloid assembly in which all-left-handed sheets mate with their all-right-handed counterparts. This determination of racemic amyloid assemblies by MicroED reveals complex amyloid architectures and illustrates the racemic advantage in macromolecular crystallography, now with submicrometre-sized crystals.

PubMed: 30867917
DOI: 10.1107/S2052252518017621

実験手法

X-RAY DIFFRACTION (1.1 Å)