Structural basis for recognition of UUUOH 3'-terminii of nascent RNA pol III transcripts by La autoantigen

Experimental Data Snapshot

  • Resolution: 2.29 Å
  • R-Value Free: 0.288 
  • R-Value Work: 0.219 
  • R-Value Observed: 0.222 

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Structural Basis for Recognition and Sequestration of UUU(OH) 3' Temini of Nascent RNA Polymerase III Transcripts by La, a Rheumatic Disease Autoantigen.

Teplova, M.Yuan, Y.R.Phan, A.T.Malinina, L.Ilin, S.Teplov, A.Patel, D.J.

(2006) Mol Cell 21: 75-85

  • DOI: https://doi.org/10.1016/j.molcel.2005.10.027
  • Primary Citation of Related Structures:  
    1YTY, 1ZH5

  • PubMed Abstract: 

    The nuclear phosphoprotein La was identified as an autoantigen in patients with systemic lupus erythematosus and Sjogren's syndrome. La binds to and protects the UUU(OH) 3' terminii of nascent RNA polymerase III transcripts from exonuclease digestion. We report the 1.85 angstroms crystal structure of the N-terminal domain of human La, consisting of La and RRM1 motifs, bound to r(U1-G2-C3-U4-G5-U6-U7-U8-U9OH). The U7-U8-U9OH 3' end, in a splayed-apart orientation, is sequestered within a basic and aromatic amino acid-lined cleft between the La and RRM1 motifs. The specificity-determining U8 residue bridges both motifs, in part through unprecedented targeting of the beta sheet edge, rather than the anticipated face, of the RRM1 motif. Our structural observations, supported by mutation studies of both La and RNA components, illustrate the principles behind RNA sequestration by a rheumatic disease autoantigen, whereby the UUU(OH) 3' ends of nascent RNA transcripts are protected during downstream processing and maturation events.

  • Organizational Affiliation

    Structural Biology Program, Memorial Sloan-Kettering Cancer Center, New York, New York 10021, USA.


Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
Lupus La proteinC [auth A],
D [auth B]
194Homo sapiensMutation(s): 5 
Gene Names: SSB
UniProt & NIH Common Fund Data Resources
Find proteins for P05455 (Homo sapiens)
Explore P05455 
Go to UniProtKB:  P05455
GTEx:  ENSG00000138385 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP05455
Sequence Annotations
  • Reference Sequence

Find similar nucleic acids by:  Sequence   |   3D Structure  

Entity ID: 1
MoleculeChains LengthOrganismImage
5'-R(*UP*GP*CP*UP*GP*UP*UP*UP*U)-3'A [auth C],
B [auth D]
Sequence Annotations
  • Reference Sequence
Small Molecules
Modified Residues  1 Unique
IDChains TypeFormula2D DiagramParent
Query on MSE
C [auth A],
D [auth B]
Experimental Data & Validation

Experimental Data

  • Resolution: 2.29 Å
  • R-Value Free: 0.288 
  • R-Value Work: 0.219 
  • R-Value Observed: 0.222 
  • Space Group: P 21 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 153.69α = 90
b = 54.001β = 90
c = 56.684γ = 90
Software Package:
Software NamePurpose
HKL-2000data reduction
SCALEPACKdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2006-01-17
    Type: Initial release
  • Version 1.1: 2008-04-30
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Advisory, Version format compliance