5MQ5

A protease-resistant N24S Escherichia coli Asparaginase mutant with outstanding stability and enhanced anti-leukaemic activity


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.60 Å
  • R-Value Free: 0.198 
  • R-Value Work: 0.147 

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Literature

A protease-resistant Escherichia coli asparaginase with outstanding stability and enhanced anti-leukaemic activity in vitro.

Maggi, M.Mittelman, S.D.Parmentier, J.H.Colombo, G.Meli, M.Whitmire, J.M.Merrell, D.S.Whitelegge, J.Scotti, C.

(2017) Sci Rep 7: 14479-14479

  • DOI: 10.1038/s41598-017-15075-4
  • Primary Citation of Related Structures:  
    5MQ5

  • PubMed Abstract: 
  • L-Asparaginases (ASNases) have been used as first line drugs for paediatric Acute Lymphoblastic Leukaemia (ALL) treatment for more than 40 years. Both the Escherichia coli (EcAII) and Erwinia chrysanthemi (ErAII) type II ASNases currently used in the ...

    L-Asparaginases (ASNases) have been used as first line drugs for paediatric Acute Lymphoblastic Leukaemia (ALL) treatment for more than 40 years. Both the Escherichia coli (EcAII) and Erwinia chrysanthemi (ErAII) type II ASNases currently used in the clinics are characterized by high in vivo instability, short half-life and the requirement of several administrations to obtain a pharmacologically active concentration. Moreover, they are sensitive to proteases (cathepsin B and asparagine endopeptidase) that are over-expressed by resistant leukaemia lymphoblasts, thereby impairing drug activity and pharmacokinetics. Herein, we present the biochemical, structural and in vitro antiproliferative characterization of a new EcAII variant, N24S. The mutant shows completely preserved asparaginase and glutaminase activities, long-term storage stability, improved thermal parameters, and outstanding resistance to proteases derived from leukaemia cells. Structural analysis demonstrates a modification in the hydrogen bond network related to residue 24, while Normal Mode-based geometric Simulation and Molecular Dynamics predict a general rigidification of the monomer as compared to wild-type. These improved features render N24S a potential alternative treatment to reduce the number of drug administrations in vivo and to successfully address one of the major current challenges of ALL treatment: spontaneous, protease-dependent and immunological inactivation of ASNase.


    Organizational Affiliation

    Department of Molecular Medicine, Unit of Immunology and General Pathology, University of Pavia, Pavia, Italy. claudia.scotti@unipv.it.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
L-asparaginase 2ABCD332Escherichia coliMutation(s): 1 
Gene Names: ansBb2957JW2924
EC: 3.5.1.1
Find proteins for P00805 (Escherichia coli (strain K12))
Explore P00805 
Go to UniProtKB:  P00805
Protein Feature View
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  • Reference Sequence
Small Molecules
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.60 Å
  • R-Value Free: 0.198 
  • R-Value Work: 0.147 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 152.003α = 90
b = 62.394β = 117.92
c = 142.271γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
iMOSFLMdata reduction
SCALAdata scaling
PHASERphasing

Structure Validation

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Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2017-11-15
    Type: Initial release
  • Version 2.0: 2019-10-16
    Type: Coordinate replacement
    Reason: Atoms with unrealistic or zero occupancies
    Changes: Advisory, Atomic model, Data collection, Derived calculations, Other, Refinement description, Structure summary