Crystal structure of the liganded form of Thermotoga maritima glucose binding protein

Experimental Data Snapshot

  • Resolution: 1.70 Å
  • R-Value Free: 0.241 
  • R-Value Work: 0.203 
  • R-Value Observed: 0.205 

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Structure-based design of robust glucose biosensors using a Thermotoga maritima periplasmic glucose-binding protein.

Tian, Y.Cuneo, M.J.Changela, A.Hocker, B.Beese, L.S.Hellinga, H.W.

(2007) Protein Sci 16: 2240-2250

  • DOI: https://doi.org/10.1110/ps.072969407
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    We report the design and engineering of a robust, reagentless fluorescent glucose biosensor based on the periplasmic glucose-binding protein obtained from Thermotoga maritima (tmGBP). The gene for this protein was cloned from genomic DNA and overexpressed in Escherichia coli, the identity of its cognate sugar was confirmed, ligand binding was studied, and the structure of its glucose complex was solved to 1.7 Angstrom resolution by X-ray crystallography. TmGBP is specific for glucose and exhibits high thermostability (midpoint of thermal denaturation is 119 +/- 1 degrees C and 144 +/- 2 degrees C in the absence and presence of 1 mM glucose, respectively). A series of fluorescent conjugates was constructed by coupling single, environmentally sensitive fluorophores to unique cysteines introduced by site-specific mutagenesis at positions predicted to be responsive to ligand-induced conformational changes based on the structure. These conjugates were screened to identify engineered tmGBPs that function as reagentless fluorescent glucose biosensors. The Y13C*Cy5 conjugate is bright, gives a large response to glucose over concentration ranges appropriate for in vivo monitoring of blood glucose levels (1-30 mM), and can be immobilized in an orientation-specific manner in microtiter plates to give a reversible response to glucose. The immobilized protein retains its response after long-term storage at room temperature.

  • Organizational Affiliation

    Department of Biochemistry, Duke University Medical Center, Durham, North Carolina 27710, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Sugar ABC transporter, periplasmic sugar-binding protein
A, B
313Thermotoga maritimaMutation(s): 0 
Gene Names: tm0114
Find proteins for Q9WXW9 (Thermotoga maritima (strain ATCC 43589 / DSM 3109 / JCM 10099 / NBRC 100826 / MSB8))
Explore Q9WXW9 
Go to UniProtKB:  Q9WXW9
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9WXW9
Sequence Annotations
  • Reference Sequence
Small Molecules
Experimental Data & Validation

Experimental Data

  • Resolution: 1.70 Å
  • R-Value Free: 0.241 
  • R-Value Work: 0.203 
  • R-Value Observed: 0.205 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 148.2α = 90
b = 46.06β = 108.22
c = 118.4γ = 90
Software Package:
Software NamePurpose
ADSCdata collection
XDSdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2007-05-22
    Type: Initial release
  • Version 1.1: 2008-05-01
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Data collection, Database references, Derived calculations, Structure summary
  • Version 1.4: 2023-08-30
    Changes: Data collection, Database references, Refinement description, Structure summary