1H64

CRYSTAL STRUCTURE OF THE SM-RELATED PROTEIN OF P. ABYSSI: THE BIOLOGICAL UNIT IS A HEPTAMER


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.9 Å
  • R-Value Free: 0.281 
  • R-Value Work: 0.237 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Crystal Structures of the Pyrococcus Abyssi Sm Core and its Complex with RNA.Common Features of RNA Binding in Archaea and Eukarya

Thore, S.Mayer, C.Sauter, C.Weeks, S.Suck, D.

(2003) J.Biol.Chem. 278: 1239

  • DOI: 10.1074/jbc.M207685200
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • The Sm proteins are conserved in all three domains of life and are always associated with U-rich RNA sequences. Their proposed function is to mediate RNA-RNA interactions. We present here the crystal structures of Pyrococcus abyssi Sm protein (PA-Sm1 ...

    The Sm proteins are conserved in all three domains of life and are always associated with U-rich RNA sequences. Their proposed function is to mediate RNA-RNA interactions. We present here the crystal structures of Pyrococcus abyssi Sm protein (PA-Sm1) and its complex with a uridine heptamer. The overall structure of the protein complex, a heptameric ring with a central cavity, is similar to that proposed for the eukaryotic Sm core complex and found for other archaeal Sm proteins. RNA molecules bind to the protein at two different sites. They interact specifically inside the ring with three highly conserved residues, defining the uridine-binding pocket. In addition, nucleotides also interact on the surface formed by the N-terminal alpha-helix as well as a conserved aromatic residue in beta-strand 2 of the PA-Sm1 protein. The mutation of this conserved aromatic residue shows the importance of this second site for the discrimination between RNA sequences. Given the high structural homology between archaeal and eukaryotic Sm proteins, the PA-Sm1.RNA complex provides a model for how the small nuclear RNA contacts the Sm proteins in the Sm core. In addition, it suggests how Sm proteins might exert their function as modulators of RNA-RNA interactions.


    Organizational Affiliation

    Structural Biology Program, European Molecular Biology Laboratory, Meyerhofstrasse 1, 69117 Heidelberg, Germany.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
SNRNP SM-LIKE PROTEIN
1, 2, A, B, C, D, E, F, G, H, I, J, K, L, M, N, O, P, Q, R, S, T, U, V, W, X, Y, Z
75Pyrococcus abyssi (strain GE5 / Orsay)Mutation(s): 0 
Find proteins for Q9V0Y8 (Pyrococcus abyssi (strain GE5 / Orsay))
Go to UniProtKB:  Q9V0Y8
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.9 Å
  • R-Value Free: 0.281 
  • R-Value Work: 0.237 
  • Space Group: P 1
Unit Cell:
Length (Å)Angle (°)
a = 69.330α = 90.21
b = 70.160β = 97.70
c = 116.010γ = 107.48
Software Package:
Software NamePurpose
XDSdata reduction
AMoREphasing
CNSrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2002-12-19
    Type: Initial release
  • Version 1.1: 2011-05-08
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance