3ICX

Crystal structure of Sulfolobus solfataricus Nop5 (135-380)

3ICX の概要

• エントリーDOI: 10.2210/pdb3icx/pdb
• 分子名称: Pre mRNA splicing protein, SULFATE ION (2 entities in total)
• 機能のキーワード: c/d guide rna, 2'-o-methylation, coiled-coil, rna binding protein
• 由来する生物種: Sulfolobus solfataricus
• タンパク質・核酸の鎖数: 3
• 化学式量合計: 87151.14

構造登録者

Ye, K. (登録日: 2009-07-19, 公開日: 2009-08-25, 最終更新日: 2023-09-06)

主引用文献

Ye, K.,Jia, R.,Lin, J.,Ju, M.,Peng, J.,Xu, A.,Zhang, L.
Structural organization of box C/D RNA-guided RNA methyltransferase.
Proc.Natl.Acad.Sci.USA, 106:13808-13813, 2009

PubMed Abstract: Box C/D guide RNAs are abundant noncoding RNAs that primarily function to direct the 2'-O-methylation of specific nucleotides by base-pairing with substrate RNAs. In archaea, a bipartite C/D RNA assembles with L7Ae, Nop5, and the methyltransferase fibrillarin into a modification enzyme with unique substrate specificity. Here, we determined the crystal structure of an archaeal C/D RNA-protein complex (RNP) composed of all 3 core proteins and an engineered half-guide RNA at 4 A resolution, as well as 2 protein substructures at higher resolution. The RNP structure reveals that the C-terminal domains of Nop5 in the dimeric complex provide symmetric anchoring sites for 2 L7Ae-associated kink-turn motifs of the C/D RNA. A prominent protrusion in Nop5 seems to be important for guide RNA organization and function and for discriminating the structurally related U4 snRNA. Multiple conformations of the N-terminal domain of Nop5 and its associated fibrillarin in different structures indicate the inherent flexibility of the catalytic module, suggesting that a swinging motion of the catalytic module is part of the enzyme mechanism. We also built a model of a native C/D RNP with substrate and fibrillarin in an active conformation. Our results provide insight into the overall organization and mechanism of action of C/D RNA-guided RNA methyltransferases.

PubMed: 19666563
DOI: 10.1073/pnas.0905128106

実験手法

X-RAY DIFFRACTION (3.1 Å)