6G6G

Crystal structure of a parallel six-helix coiled coil CC-Type2-FI

6G6G の概要

• エントリーDOI: 10.2210/pdb6g6g/pdb
• 分子名称: CC-Type2-FI (2 entities in total)
• 機能のキーワード: de novo, coiled coil, alpha-helical bundle, synthetic construct, de novo protein
• 由来する生物種: synthetic construct
• タンパク質・核酸の鎖数: 12
• 化学式量合計: 40451.22

構造登録者

Rhys, G.G.,Brady, R.L.,Woolfson, D.N. (登録日: 2018-04-01, 公開日: 2018-10-17)

主引用文献

Rhys, G.G.,Wood, C.W.,Lang, E.J.M.,Mulholland, A.J.,Brady, R.L.,Thomson, A.R.,Woolfson, D.N.
Maintaining and breaking symmetry in homomeric coiled-coil assemblies.
Nat Commun, 9:4132-4132, 2018

PubMed Abstract: In coiled-coil (CC) protein structures α-helices wrap around one another to form rope-like assemblies. Most natural and designed CCs have two-four helices and cyclic (C) or dihedral (D) symmetry. Increasingly, CCs with five or more helices are being reported. A subset of these higher-order CCs is of interest as they have accessible central channels that can be functionalised; they are α-helical barrels. These extended cavities are surprising given the drive to maximise buried hydrophobic surfaces during protein folding and assembly in water. Here, we show that α-helical barrels can be maintained by the strategic placement of β-branched aliphatic residues lining the lumen. Otherwise, the structures collapse or adjust to give more-complex multi-helix assemblies without C or D symmetry. Nonetheless, the structural hallmark of CCs-namely, knobs-into-holes packing of side chains between helices-is maintained leading to classes of CCs hitherto unobserved in nature or accessed by design.

PubMed: 30297707
DOI: 10.1038/s41467-018-06391-y

実験手法

X-RAY DIFFRACTION (1.7 Å)