Crystal structure of Bacillus licheniformis trehalose-6-phosphate hydrolase (TreA), mutant R201Q, in complex with PNG

Experimental Data Snapshot

  • Resolution: 2.05 Å
  • R-Value Free: 0.214 
  • R-Value Work: 0.171 
  • R-Value Observed: 0.171 

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Bacillus licheniformis trehalose-6-phosphate hydrolase structures suggest keys to substrate specificity

Lin, M.-G.Chi, M.-C.Naveen, V.Li, Y.-C.Lin, L.-L.Hsiao, C.-D.

(2016) Acta Crystallogr D Struct Biol 72: 59-70

  • DOI: https://doi.org/10.1107/S2059798315020756
  • Primary Citation of Related Structures:  
    5BRP, 5BRQ

  • PubMed Abstract: 

    Trehalose-6-phosphate hydrolase (TreA) belongs to glycoside hydrolase family 13 (GH13) and catalyzes the hydrolysis of trehalose 6-phosphate (T6P) to yield glucose and glucose 6-phosphate. The products of this reaction can be further metabolized by the energy-generating glycolytic pathway. Here, crystal structures of Bacillus licheniformis TreA (BlTreA) and its R201Q mutant complexed with p-nitrophenyl-α-D-glucopyranoside (R201Q-pPNG) are presented at 2.0 and 2.05 Å resolution, respectively. The overall structure of BlTreA is similar to those of other GH13 family enzymes. However, detailed structural comparisons revealed that the catalytic site of BlTreA contains a long loop that adopts a different conformation from those of other GH13 family members. Unlike the homologous regions of Bacillus cereus oligo-1,6-glucosidase (BcOgl) and Erwinia rhapontici isomaltulose synthase (NX-5), the surface potential of the BlTreA active site exhibits a largely positive charge contributed by the four basic residues His281, His282, Lys284 and Lys292. Mutation of these residues resulted in significant decreases in the enzymatic activity of BlTreA. Strikingly, the (281)HHLK(284) motif and Lys292 play critical roles in substrate discrimination by BlTreA.

  • Organizational Affiliation

    Institute of Bioinformatics and Structural Biology, National Tsing Hua University, Hsinchu 300, Taiwan.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Glycoside Hydrolase Family 13
A, B, C, D
568Bacillus licheniformis DSM 13 = ATCC 14580Mutation(s): 1 
Gene Names: treABL03069
Find proteins for Q65MI2 (Bacillus licheniformis (strain ATCC 14580 / DSM 13 / JCM 2505 / CCUG 7422 / NBRC 12200 / NCIMB 9375 / NCTC 10341 / NRRL NRS-1264 / Gibson 46))
Explore Q65MI2 
Go to UniProtKB:  Q65MI2
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ65MI2
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.05 Å
  • R-Value Free: 0.214 
  • R-Value Work: 0.171 
  • R-Value Observed: 0.171 
  • Space Group: P 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 60.252α = 80.3
b = 97.388β = 88.15
c = 108.539γ = 72.18
Software Package:
Software NamePurpose
Cootmodel building
HKL-2000data processing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2016-03-02
    Type: Initial release
  • Version 1.1: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Data collection, Derived calculations, Structure summary
  • Version 1.2: 2023-11-08
    Changes: Data collection, Database references, Refinement description, Structure summary