Crystal structure of the PKA-protein A fusion protein

Experimental Data Snapshot

  • Resolution: 3.20 Å
  • R-Value Free: 0.284 
  • R-Value Work: 0.239 
  • R-Value Observed: 0.242 

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Construction of novel repeat proteins with rigid and predictable structures using a shared helix method.

Youn, S.J.Kwon, N.Y.Lee, J.H.Kim, J.H.Choi, J.Lee, H.Lee, J.O.

(2017) Sci Rep 7: 2595-2595

  • DOI: https://doi.org/10.1038/s41598-017-02803-z
  • Primary Citation of Related Structures:  
    5H75, 5H76, 5H77, 5H78, 5H79, 5H7A, 5H7B, 5H7C, 5H7D, 5X3F, 5XBY

  • PubMed Abstract: 

    Generating artificial protein assemblies with complex shapes requires a method for connecting protein components with stable and predictable structures. Currently available methods for creating rigid protein assemblies rely on either complicated calculations or extensive trial and error. We describe a simple and efficient method for connecting two proteins via a fused alpha helix that is formed by joining two preexisting helices into a single extended helix. Because the end-to-end ligation of helices does not guarantee the formation of a continuous helix, we superimposed 1-2 turns of pairs of connecting helices by using a molecular graphics program. Then, we chose amino acids from the two natural sequences that would stabilize the connecting helix. This "shared helix method" is highly efficient. All the designed proteins that could be produced in Escherichia coli were readily crystallized and had the expected fusion structures. To prove the usefulness of this method, we produced two novel repeat proteins by assembling several copies of natural or artificial proteins with alpha helices at both termini. Their crystal structures demonstrated the successful assembly of the repeating units with the intended curved shapes. We propose that this method could dramatically expand the available repertoire of natural repeat proteins.

  • Organizational Affiliation

    Department of Chemistry, Korea Advanced Institute of Science and Technology, Daejeon, 34141, Korea.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
cAMP-dependent protein kinase type II-alpha regulatory subunit,Immunoglobulin G-binding protein A
A, B, C, D, E
A, B, C, D, E, F, G, H, I, J, K, L
90Homo sapiensStaphylococcus aureus
This entity is chimeric
Mutation(s): 2 
Gene Names: PRKAR2APKR2PRKAR2spa
UniProt & NIH Common Fund Data Resources
Find proteins for P38507 (Staphylococcus aureus)
Explore P38507 
Go to UniProtKB:  P38507
Find proteins for P13861 (Homo sapiens)
Explore P13861 
Go to UniProtKB:  P13861
PHAROS:  P13861
GTEx:  ENSG00000114302 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupsP38507P13861
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 3.20 Å
  • R-Value Free: 0.284 
  • R-Value Work: 0.239 
  • R-Value Observed: 0.242 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 71.588α = 90
b = 135.378β = 108.77
c = 88.988γ = 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: 2017-06-28
    Type: Initial release
  • Version 1.1: 2023-11-08
    Changes: Data collection, Database references, Refinement description