5YGG

Crystal structure of Fructokinase Double-Mutant (T261C-H108C) from Vibrio cholerae O395 in fructose, ADP and potassium ion bound form


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.67 Å
  • R-Value Free: 0.195 
  • R-Value Work: 0.163 
  • R-Value Observed: 0.165 

Starting Model: experimental
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This is version 1.3 of the entry. See complete history


Literature

Large-scale conformational changes and redistribution of surface negative charge upon sugar binding dictate the fidelity of phosphorylation in Vibrio cholerae fructokinase.

Paul, R.Chatterjee, S.Nath, S.Sen, U.

(2018) Sci Rep 8: 16925-16925

  • DOI: https://doi.org/10.1038/s41598-018-35236-3
  • Primary Citation of Related Structures:  
    5YGG

  • PubMed Abstract: 

    Fructokinase (FRK) catalyzes the first step of fructose metabolism i.e., D-fructose to D-fructose-6-phosphate (F6P), however, the mechanistic insights of this reaction are elusive yet. Here we demonstrate that the putative Vibrio cholerae fructokinase (VcFRK) exhibit strong fructose-6-kinase activity allosterically modulated by K + /Cs + . We have determined the crystal structures of apo-VcFRK and its complex with fructose, fructose-ADP-Ca 2+ , fructose-ADP-Ca 2+ -BeF 3 - . Collectively, we propose the catalytic mechanism and allosteric activation of VcFRK in atomistic details explaining why K + /Cs + are better activator than Na + . Structural results suggest that apo VcFRK allows entry of fructose in the active site, sequester it through several conserved H-bonds and attains a closed form through large scale conformational changes. A double mutant (H108C/T261C-VcFRK), that arrests the closed form but unable to reopen for F6P release, is catalytically impotent highlighting the essentiality of this conformational change. Negative charge accumulation around ATP upon fructose binding, is presumed to redirect the γ-phosphate towards fructose for efficient phosphotransfer. Reduced phosphotransfer rate of the mutants E205Q and E110Q supports this view. Atomic resolution structure of VcFRK-fructose-ADP-Ca 2+ -BeF 3 - , reported first time for any sugar kinase, suggests that BeF 3 - moiety alongwith R176, Ca 2+ and 'anion hole' limit the conformational space for γ-phosphate favoring in-line phospho-transfer.


  • Organizational Affiliation

    Crystallography and Molecular Biology Division, Saha Institute of Nuclear Physics, HBNI, 1/AF Bidhan Nagar, Kolkata, 700064, India.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Fructokinase323Vibrio cholerae O395Mutation(s): 2 
Gene Names: cscKVC0395_0600
EC: 2.7.1.4
UniProt
Find proteins for A0A0H3AER7 (Vibrio cholerae serotype O1 (strain ATCC 39541 / Classical Ogawa 395 / O395))
Explore A0A0H3AER7 
Go to UniProtKB:  A0A0H3AER7
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupA0A0H3AER7
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.67 Å
  • R-Value Free: 0.195 
  • R-Value Work: 0.163 
  • R-Value Observed: 0.165 
  • Space Group: P 2 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 41.76α = 90
b = 64.33β = 90
c = 116.4γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
iMOSFLMdata reduction
Aimlessdata scaling
PHENIXphasing

Structure Validation

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Ligand Structure Quality Assessment 


Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2018-09-26
    Type: Initial release
  • Version 1.1: 2020-05-13
    Changes: Data collection, Database references
  • Version 1.2: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Data collection, Derived calculations, Structure summary
  • Version 1.3: 2023-11-22
    Changes: Data collection, Database references, Refinement description, Structure summary