1FHT

RNA-BINDING DOMAIN OF THE U1A SPLICEOSOMAL PROTEIN U1A117, NMR, 43 STRUCTURES


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Submitted: 43 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Solution structure of the N-terminal RNP domain of U1A protein: the role of C-terminal residues in structure stability and RNA binding.

Avis, J.M.Allain, F.H.Howe, P.W.Varani, G.Nagai, K.Neuhaus, D.

(1996) J.Mol.Biol. 257: 398-411

  • DOI: 10.1006/jmbi.1996.0171

  • PubMed Abstract: 
  • The solution structure of a fragment of the human U1A spliceosomal protein containing residues 2 to 117 (U1A117) determined using multi-dimensional heteronuclear NMR is presented. The C-terminal region of the molecule is considerably more ordered in ...

    The solution structure of a fragment of the human U1A spliceosomal protein containing residues 2 to 117 (U1A117) determined using multi-dimensional heteronuclear NMR is presented. The C-terminal region of the molecule is considerably more ordered in the free protein than thought previously and its conformation is different from that seen in the crystal structure of the complex with U1 RNA hairpin II. The residues between Asp90 and Lys98 form an alpha-helix that lies across the beta-sheet, with residues IIe93, IIe94 and Met97 making contacts with Leu44, Phe56 and IIe58. This interaction prevents solvent exposure of hydrophobic residues on the surface of the beta-sheet, thereby stabilising the protein. Upon RNA binding, helix C moves away from this position, changing its orientation by 135 degrees to allow Tyr13, Phe56 and Gln54 to stack with bases of the RNA, and also allowing Leu44 to contact the RNA. The new position of helix C in the complex with RNA is stabilised by hydrophobic interactions from IIe93 and IIe94 to IIe58, Leu 41, Val62 and His 10, as well as a hydrogen bond between Ser91 and Thr11. The movement of helix C mainly involves changes in the main-chain torsion angles of Thr89, Asp90 and Ser91, the helix thereby acting as a "lid" over the RNA binding surface.


    Related Citations: 
    • Crystal Structure at 1.92 A Resolution of the RNA-Binding Domain of the U1A Spliceosomal Protein Complexed with an RNA Hairpin
      Oubridge, C.,Ito, N.,Evans, P.R.,Teo, C.H.,Nagai, K.
      (1994) Nature 372: 432
    • Crystal Structure of the RNA-Binding Domain of the U1 Small Nuclear Ribonucleoprotein A
      Nagai, K.,Oubridge, C.,Jessen, T.H.,Li, J.,Evans, P.R.
      (1990) Nature 348: 515


    Organizational Affiliation

    MRC Laboratory of Molecular Biology, Cambridge, UK.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
U1 SMALL NUCLEAR RIBONUCLEOPROTEIN A
A
116Homo sapiensGene Names: SNRPA
Find proteins for P09012 (Homo sapiens)
Go to Gene View: SNRPA
Go to UniProtKB:  P09012
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Submitted: 43 
  • Olderado: 1FHT Olderado
Software Package:
Software NamePurpose
X-PLORrefinement
X-PLORmodel building
X-PLORphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1996-07-11
    Type: Initial release
  • Version 1.1: 2008-03-24
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance