1A9N

CRYSTAL STRUCTURE OF THE SPLICEOSOMAL U2B''-U2A' PROTEIN COMPLEX BOUND TO A FRAGMENT OF U2 SMALL NUCLEAR RNA


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.38 Å
  • R-Value Free: 0.328 
  • R-Value Work: 0.282 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Crystal structure of the spliceosomal U2B"-U2A' protein complex bound to a fragment of U2 small nuclear RNA.

Price, S.R.Evans, P.R.Nagai, K.

(1998) Nature 394: 645-650

  • DOI: 10.1038/29234

  • PubMed Abstract: 
  • We have determined the crystal structure at 2.4 A resolution of a ternary complex between the spliceosomal U2B"/U2A' protein complex and hairpin-loop IV of U2 small nuclear RNA. Unlike its close homologue the U1A protein, U2B" binds to its cognate RN ...

    We have determined the crystal structure at 2.4 A resolution of a ternary complex between the spliceosomal U2B"/U2A' protein complex and hairpin-loop IV of U2 small nuclear RNA. Unlike its close homologue the U1A protein, U2B" binds to its cognate RNA only in the presence of U2A', which contains leucine-rich repeats in its sequence. The concave surface of a parallel beta-sheet within the leucine-rich-repeat region of U2A' interacts with the ribonucleoprotein domain of U2B" on the surface opposite its RNA-binding surface. The basic carboxy-terminal region of U2A' interacts with the RNA stem. The crystal structure reveals how protein-protein interaction regulates RNA-binding specificity, and how replacing only a few key residues allows the U2B" and U1A proteins to discriminate between their cognate RNA hairpins by forming alternative networks of interactions.


    Organizational Affiliation

    MRC Laboratory of Molecular Biology, Cambridge, UK.




Macromolecules

Find similar proteins by: Sequence  |  Structure


Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
U2A'
A, C
176Homo sapiensGene Names: SNRPA1
Find proteins for P09661 (Homo sapiens)
Go to Gene View: SNRPA1
Go to UniProtKB:  P09661
Entity ID: 3
MoleculeChainsSequence LengthOrganismDetails
SPLICEOSOMAL U2B''
B, D
96Homo sapiensGene Names: SNRPB2
Find proteins for P08579 (Homo sapiens)
Go to Gene View: SNRPB2
Go to UniProtKB:  P08579
Entity ID: 1
MoleculeChainsLengthOrganism
RNA (5'-R(*CP*CP*UP*GP*GP*UP*AP*UP*UP*GP*CP*AP*GP*UP*AP*CP*CP*UP*CP*CP*AP*GP* GP*U)-3')Q,R24Homo sapiens
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.38 Å
  • R-Value Free: 0.328 
  • R-Value Work: 0.282 
  • Space Group: P 21 21 2
Unit Cell:
Length (Å)Angle (°)
a = 98.370α = 90.00
b = 128.240β = 90.00
c = 66.650γ = 90.00
Software Package:
Software NamePurpose
SCALAdata scaling
CCP4data scaling
REFMACrefinement
MOSFLMdata reduction
SHARPphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1998-09-23
    Type: Initial release
  • Version 1.1: 2008-05-22
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance