5BRQ

Crystal structure of Bacillus licheniformis trehalose-6-phosphate hydrolase (TreA)

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.00 Å
  • R-Value Free: 0.245 
  • R-Value Work: 0.181 
  • R-Value Observed: 0.182 

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Literature

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: 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 e ...

    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 Molecular Biology, Academia Sinica, Taipei 115, Taiwan.



Macromolecules
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(by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Glycoside Hydrolase Family 13 A, B, C, D568Bacillus licheniformis DSM 13 = ATCC 14580Mutation(s): 0 
Gene Names: treA, BL03069
EC: 3.2.1.93
Find proteins for Q65MI2 (Bacillus licheniformis (strain ATCC 14580 / DSM 13 / JCM 2505 / NBRC 12200 / NCIMB 9375 / NRRL NRS-1264 / Gibson 46))
Explore Q65MI2 
Go to UniProtKB:  Q65MI2
Protein Feature View
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  • Reference Sequence
Small Molecules
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.00 Å
  • R-Value Free: 0.245 
  • R-Value Work: 0.181 
  • R-Value Observed: 0.182 
  • Space Group: P 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 59.802α = 98.2
b = 97.584β = 91.44
c = 108.336γ = 108.15
Software Package:
Software NamePurpose
PHENIXrefinement

Structure Validation

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Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2016-03-02
    Type: Initial release