Experimental Data Snapshot

  • Resolution: 2.10 Å
  • R-Value Free: 0.224 
  • R-Value Work: 0.176 
  • R-Value Observed: 0.177 

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Structure and function of the Bacillus hybrid enzyme GluXyn-1: native-like jellyroll fold preserved after insertion of autonomous globular domain.

Ay, J.Gotz, F.Borriss, R.Heinemann, U.

(1998) Proc Natl Acad Sci U S A 95: 6613-6618

  • DOI: https://doi.org/10.1073/pnas.95.12.6613
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    The 1,3-1,4-beta-glucanase from Bacillus macerans (wtGLU) and the 1, 4-beta-xylanase from Bacillus subtilis (wtXYN) are both single-domain jellyroll proteins catalyzing similar enzymatic reactions. In the fusion protein GluXyn-1, the two proteins are joined by insertion of the entire XYN domain into a surface loop of cpMAC-57, a circularly permuted variant of wtGLU. GluXyn-1 was generated by protein engineering methods, produced in Escherichia coli and shown to fold spontaneously and have both enzymatic activities at wild-type level. The crystal structure of GluXyn-1 was determined at 2.1 A resolution and refined to R = 17.7% and R(free) = 22.4%. It shows nearly ideal, native-like folding of both protein domains and a small, but significant hinge bending between the domains. The active sites are independent and accessible explaining the observed enzymatic activity. Because in GluXyn-1 the complete XYN domain is inserted into the compact folding unit of GLU, the wild-type-like activity and tertiary structure of the latter proves that the folding process of GLU does not depend on intramolecular interactions that are short-ranged in the sequence. Insertion fusions of the GluXyn-1 type may prove to be an easy route toward more stable bifunctional proteins in which the two parts are more closely associated than in linear end-to-end protein fusions.

  • Organizational Affiliation

    Forschungsgruppe Kristallographie, Max-Delbrück-Centrum für Molekulare Medizin, Robert-Rössle-Strasse 10, D-13122 Berlin, Germany.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
A, B
394Bacillus subtilisMutation(s): 0 
EC: (PDB Primary Data), (PDB Primary Data)
Find proteins for P23904 (Paenibacillus macerans)
Explore P23904 
Go to UniProtKB:  P23904
Find proteins for P18429 (Bacillus subtilis (strain 168))
Explore P18429 
Go to UniProtKB:  P18429
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupsP23904P18429
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.10 Å
  • R-Value Free: 0.224 
  • R-Value Work: 0.176 
  • R-Value Observed: 0.177 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 45.27α = 90
b = 133.7β = 99.76
c = 77.95γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
SCALAdata scaling
CCP4data scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 1999-05-11
    Type: Initial release
  • Version 1.1: 2008-03-24
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2023-08-02
    Changes: Database references, Derived calculations, Refinement description