"Structure and function of archaeal box C/D sRNP core proteins."
Aittaleb M, Rashid R, Chen Q, Palmer JR, Daniels CJ, Li H
Published 2003-04-01 in Nat Struct Biol volume 10 .
Pubmed ID: 12598892
DOI identifier: -
|Nop56p and Nop58p are two core proteins of the box C/D snoRNPs that interact concurrently with fibrillarin and snoRNAs to function in enzyme assembly and catalysis. Here we report the 2.9 A resolution co-crystal structure of an archaeal homolog of Nop56p/Nop58p, Nop5p, in complex with fibrillarin from Archaeoglobus fulgidus (AF) and the methyl donor S-adenosyl-L-methionine. The N-terminal domain of Nop5p forms a complementary surface to fibrillarin that serves to anchor the catalytic subunit and to stabilize cofactor binding. A coiled coil in Nop5p mediates dimerization of two fibrillarin-Nop5p heterodimers for optimal interactions with bipartite box C/D RNAs. Structural analysis and complementary biochemical data demonstrate that the conserved C-terminal domain of Nop5p harbors RNA-binding sites. A model of box C/D snoRNP assembly is proposed based on the presented structural and biochemical data.|
This publication refers to following proteins:
- FlpA (Archaeoglobus fulgidus)
- Nop56/58 (Archaeoglobus fulgidus)
Last modification of this entry: Sept. 6, 2012