A-zyme, N-acetylgalactosaminidase

Experimental Data Snapshot

  • Resolution: 2.30 Å
  • R-Value Free: 0.220 
  • R-Value Work: 0.192 
  • R-Value Observed: 0.193 

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Bacterial Glycosidases for the Production of Universal Red Blood Cells.

Liu, Q.P.Sulzenbacher, G.Yuan, H.Bennett, E.P.Pietz, G.Saunders, K.Spence, J.Nudelman, E.Levery, S.B.White, T.Neveu, J.M.Lane, W.S.Bourne, Y.Olsson, M.L.Henrissat, B.Clausen, H.

(2007) Nat Biotechnol 25: 454

  • DOI: https://doi.org/10.1038/nbt1298
  • Primary Citation of Related Structures:  
    2IXA, 2IXB

  • PubMed Abstract: 

    Enzymatic removal of blood group ABO antigens to develop universal red blood cells (RBCs) was a pioneering vision originally proposed more than 25 years ago. Although the feasibility of this approach was demonstrated in clinical trials for group B RBCs, a major obstacle in translating this technology to clinical practice has been the lack of efficient glycosidase enzymes. Here we report two bacterial glycosidase gene families that provide enzymes capable of efficient removal of A and B antigens at neutral pH with low consumption of recombinant enzymes. The crystal structure of a member of the alpha-N-acetylgalactosaminidase family reveals an unusual catalytic mechanism involving NAD+. The enzymatic conversion processes we describe hold promise for achieving the goal of producing universal RBCs, which would improve the blood supply while enhancing the safety of clinical transfusions.

  • Organizational Affiliation

    ZymeQuest Inc., 100 Cummings Center, Suite 436H, Beverly, Massachusetts 01915, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
ALPHA-N-ACETYLGALACTOSAMINIDASE444Elizabethkingia meningosepticaMutation(s): 0 
Find proteins for A4Q8F7 (Elizabethkingia meningoseptica)
Explore A4Q8F7 
Go to UniProtKB:  A4Q8F7
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupA4Q8F7
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.30 Å
  • R-Value Free: 0.220 
  • R-Value Work: 0.192 
  • R-Value Observed: 0.193 
  • Space Group: P 65 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 87.659α = 90
b = 87.659β = 90
c = 299.427γ = 120
Software Package:
Software NamePurpose
MOSFLMdata reduction
SCALAdata scaling

Structure Validation

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Ligand Structure Quality Assessment 

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2007-04-10
    Type: Initial release
  • Version 1.1: 2011-05-08
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2018-03-07
    Changes: Source and taxonomy
  • Version 1.4: 2024-05-08
    Changes: Data collection, Database references, Other