8ECE image
Entry Detail
PDB ID:
8ECE
Keywords:
Title:
E. coli L-asparaginase II mutant (V27T) in complex with L-Glu
Biological Source:
Source Organism:
PDB Version:
Deposition Date:
2022-09-01
Release Date:
2022-11-16
Method Details:
Experimental Method:
Resolution:
1.86 Å
R-Value Free:
0.19
R-Value Work:
0.14
R-Value Observed:
0.14
Space Group:
P 21 21 21
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:L-asparaginase 2
Mutations:V27T
Chain IDs:A, B, C, D
Chain Length:334
Number of Molecules:4
Biological Source:Escherichia coli K-12
Primary Citation
The E. coli L-asparaginase V27T mutant: structural and functional characterization and comparison with theoretical predictions.
Febs Lett. 596 3060 3068 (2022)
PMID: 36310372 DOI: 10.1002/1873-3468.14526

Abstact

Bacterial L-asparaginases have been used for over 40 years as anticancer drugs. Ardalan et al. (Medical Hypotheses 112, 7-17, 2018) proposed that the V27T mutant of Escherichia coli type II L-asparaginase, EcAII(V27T), should display altered biophysical and catalytic properties compared to the wild-type enzyme, EcAII(wt), rendering it more favourable as a pharmaceutical. They postulated that EcAII(V27T) would exhibit reduced glutaminolytic activity and be more stable compared to EcAII(wt). Their postulates, however, were purely theoretical. Here, we characterized experimentally selected properties of EcAII(V27T). We found asparaginolytic activity of this mutant unchanged, whereas its glutaminolytic activity was fourfold lower compared with EcAII(wt). We did not observe significant differences in stabilities of EcAII(wt) and EcAII(V27T). Crystal structures of the complexes with L-Asp and L-Glu showed considerable differences in binding modes of both substrates.

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