Chitinase B from Serratia Marcescens

Experimental Data Snapshot

  • Resolution: 1.90 Å
  • R-Value Free: 0.212 
  • R-Value Work: 0.183 
  • R-Value Observed: 0.183 

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Structure of a Two-Domain Chitotriosidase from Serratia Marcescens at 1.9 Angstrom Resoltuion

Van Aalten, D.M.F.Synstad, B.Brurberg, M.B.Hough, E.Riise, B.W.Eijsink, V.G.H.Wierenga, R.K.

(2000) Proc Natl Acad Sci U S A 97: 5842

  • DOI: https://doi.org/10.1073/pnas.97.11.5842
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    In this paper, we describe the structure of chitinase B from Serratia marcescens, which consists of a catalytic domain with a TIM-barrel fold and a 49-residue C-terminal chitin-binding domain. This chitinase is the first structure of a bacterial exochitinase, and it represents one of only a few examples of a glycosyl hydrolase structure having interacting catalytic and substrate-binding domains. The chitin-binding domain has exposed aromatic residues that contribute to a 55-A long continuous aromatic stretch extending into the active site. Binding of chitin oligomers is blocked beyond the -3 subsite, which explains why the enzyme has chitotriosidase activity and degrades the chitin chain from the nonreducing end. Comparison of the chitinase B structure with that of chitinase A explains why these enzymes act synergistically in the degradation of chitin.

  • Organizational Affiliation

    Biocenter Oulu, Department of Biochemistry, University of Oulu, Linnanmaa, FIN-90570 Oulu, Finland. dava@davapc1.bioch.dundee.ac.uk

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
A, B
499Serratia marcescensMutation(s): 0 
Find proteins for Q54276 (Serratia marcescens)
Explore Q54276 
Go to UniProtKB:  Q54276
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ54276
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 1.90 Å
  • R-Value Free: 0.212 
  • R-Value Work: 0.183 
  • R-Value Observed: 0.183 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 56.135α = 90
b = 106.586β = 90
c = 187.326γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2000-08-18
    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: 2019-07-24
    Changes: Data collection