5CIM

Structure of Mycobacterium thermoresistibile GlgE in complex with maltose (cocrystallisation with maltose-1-phosphate) at 3.32A resolution


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.32 Å
  • R-Value Free: 0.214 
  • R-Value Work: 0.178 
  • R-Value Observed: 0.180 

Starting Model: experimental
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This is version 2.1 of the entry. See complete history


Literature

Structure of Mycobacterium thermoresistibile GlgE defines novel conformational states that contribute to the catalytic mechanism.

Mendes, V.Blaszczyk, M.Maranha, A.Empadinhas, N.Blundell, T.L.

(2015) Sci Rep 5: 17144-17144

  • DOI: https://doi.org/10.1038/srep17144
  • Primary Citation of Related Structures:  
    5CGM, 5CIM, 5CJ5

  • PubMed Abstract: 

    GlgE, an enzyme of the pathway that converts trehalose to α-glucans, is essential for Mycobacterium tuberculosis. Inhibition of GlgE, which transfers maltose from a maltose-1-phosphate donor to α-glucan/maltooligosaccharide chain acceptor, leads to a toxic accumulation of maltose-1-phosphate that culminates in cellular death. Here we describe the first high-resolution mycobacterial GlgE structure from Mycobacterium thermoresistibile at 1.96 Å. We show that the structure resembles that of M. tuberculosis and Streptomyces coelicolor GlgEs, reported before, with each protomer in the homodimer comprising five domains. However, in M. thermoresistibile GlgE we observe several conformational states of the S domain and provide evidence that its high flexibility is important for enzyme activity. The structures here reported shed further light on the interactions between the N-terminal domains and the catalytic domains of opposing chains and how they contribute to the catalytic reaction. Importantly this work identifies a useful surrogate system to aid the development of GlgE inhibitors against opportunistic and pathogenic mycobacteria.


  • Organizational Affiliation

    Department of Biochemistry, University of Cambridge, Cambridge CB2 1GA, UK.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Alpha-1,4-glucan:maltose-1-phosphate maltosyltransferase
A, B
698Mycolicibacterium thermoresistibile ATCC 19527Mutation(s): 0 
Gene Names: glgEKEK_12948
EC: 2.4.99.16
UniProt
Find proteins for G7CL00 (Mycolicibacterium thermoresistibile (strain ATCC 19527 / DSM 44167 / CIP 105390 / JCM 6362 / NCTC 10409 / 316))
Explore G7CL00 
Go to UniProtKB:  G7CL00
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupG7CL00
Sequence Annotations
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  • Reference Sequence
Oligosaccharides

Help

Entity ID: 2
MoleculeChains Length2D Diagram Glycosylation3D Interactions
alpha-D-glucopyranose-(1-4)-alpha-D-glucopyranose
C
2N/A
Glycosylation Resources
GlyTouCan:  G07411ON
GlyCosmos:  G07411ON
Biologically Interesting Molecules (External Reference) 1 Unique
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.32 Å
  • R-Value Free: 0.214 
  • R-Value Work: 0.178 
  • R-Value Observed: 0.180 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 77.537α = 90
b = 112.967β = 90
c = 221.433γ = 90
Software Package:
Software NamePurpose
BUSTER-TNTrefinement
SCALAdata scaling
PDB_EXTRACTdata extraction
XDSdata reduction
PHASERphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2015-12-09
    Type: Initial release
  • Version 2.0: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Atomic model, Data collection, Derived calculations, Non-polymer description, Structure summary
  • Version 2.1: 2024-01-10
    Changes: Data collection, Database references, Refinement description, Structure summary