Structure of the U1A variant A1-98 Y31H/Q36R/F56W triple mutant

Experimental Data Snapshot

  • Resolution: 1.84 Å
  • R-Value Free: 0.245 
  • R-Value Work: 0.213 

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Expanding crystallization tools for nucleic acid complexes using U1A protein variants.

Rosenbach, H.Victor, J.Borggrafe, J.Biehl, R.Steger, G.Etzkorn, M.Span, I.

(2020) J Struct Biol 210: 107480-107480

  • DOI: https://doi.org/10.1016/j.jsb.2020.107480
  • Primary Citation of Related Structures:  
    6SQN, 6SQQ, 6SQT, 6SQV, 6SR7

  • PubMed Abstract: 

    The major bottlenecks in structure elucidation of nucleic acids are crystallization and phasing. Co-crystallization with proteins is a straight forward approach to overcome these challenges. The human RNA-binding protein U1A has previously been established as crystallization module, however, the absence of UV-active residues and the predetermined architecture in the asymmetric unit constitute clear limitations of the U1A system. Here, we report three crystal structures of tryptophan-containing U1A variants, which expand the crystallization toolbox for nucleic acids. Analysis of the structures complemented by SAXS, NMR spectroscopy, and optical spectroscopy allow for insights into the potential of the U1A variants to serve as crystallization modules for nucleic acids. In addition, we report a fast and efficient protocol for crystallization of RNA by soaking and present a fluorescence-based approach for detecting RNA-binding in crystallo. Our results provide a new tool set for the crystallization of RNA and RNA:DNA complexes.

  • Organizational Affiliation

    Institut für Physikalische Biologie, Heinrich-Heine-Universitaet Duesseldorf, Universitaetsstrasse 1, 40225 Duesseldorf, Germany. Electronic address: hannah.rosenbach@hhu.de.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
U1 small nuclear ribonucleoprotein AA [auth AAA],
B [auth BBB],
C [auth CCC]
98Homo sapiensMutation(s): 3 
Gene Names: SNRPA
UniProt & NIH Common Fund Data Resources
Find proteins for P09012 (Homo sapiens)
Explore P09012 
Go to UniProtKB:  P09012
PHAROS:  P09012
GTEx:  ENSG00000077312 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP09012
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 1.84 Å
  • R-Value Free: 0.245 
  • R-Value Work: 0.213 
  • Space Group: P 32 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 89.81α = 90
b = 89.81β = 90
c = 86.56γ = 120
Software Package:
Software NamePurpose
xia2data reduction
Aimlessdata scaling

Structure Validation

View Full Validation Report

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2020-05-13
    Type: Initial release
  • Version 1.1: 2024-05-15
    Changes: Data collection, Database references, Derived calculations