5AEB

Crystal structure of the class B3 di-zinc metallo-beta-lactamase LRA- 12 from an Alaskan soil metagenome.


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.10 Å
  • R-Value Free: 0.235 
  • R-Value Work: 0.184 
  • R-Value Observed: 0.187 

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This is version 1.1 of the entry. See complete history


Literature

Crystal structure and kinetic analysis of the class B3 di-zinc metallo-beta-lactamase LRA-12 from an Alaskan soil metagenome.

Rodriguez, M.M.Herman, R.Ghiglione, B.Kerff, F.D'Amico Gonzalez, G.Bouillenne, F.Galleni, M.Handelsman, J.Charlier, P.Gutkind, G.Sauvage, E.Power, P.

(2017) PLoS One 12: e0182043-e0182043

  • DOI: 10.1371/journal.pone.0182043
  • Primary Citation of Related Structures:  
    5AEB

  • PubMed Abstract: 
  • We analyzed the kinetic properties of the metagenomic class B3 β-lactamase LRA-12, and determined its crystallographic structure in order to compare it with prevalent metallo-β-lactamases (MBLs) associated with clinical pathogens. We showed that LRA-12 confers extended-spectrum resistance on E ...

    We analyzed the kinetic properties of the metagenomic class B3 β-lactamase LRA-12, and determined its crystallographic structure in order to compare it with prevalent metallo-β-lactamases (MBLs) associated with clinical pathogens. We showed that LRA-12 confers extended-spectrum resistance on E. coli when expressed from recombinant clones, and the MIC values for carbapenems were similar to those observed in enterobacteria expressing plasmid-borne MBLs such as VIM, IMP or NDM. This was in agreement with the strong carbapenemase activity displayed by LRA-12, similar to GOB β-lactamases. Among the chelating agents evaluated, dipicolinic acid inhibited the enzyme more strongly than EDTA, which required pre-incubation with the enzyme to achieve measurable inhibition. Structurally, LRA-12 contains the conserved main structural features of di-zinc class B β-lactamases, and presents unique structural signatures that differentiate this enzyme from others within the family: (i) two loops (α3-β7 and β11-α5) that could influence antibiotic entrance and remodeling of the active site cavity; (ii) a voluminous catalytic cavity probably responsible for the high hydrolytic efficiency of the enzyme; (iii) the absence of disulfide bridges; (iv) a unique Gln116 at metal-binding site 1; (v) a methionine residue at position 221that replaces Cys/Ser found in other B3 β-lactamases in a predominantly hydrophobic environment, likely playing a role in protein stability. The structure of LRA-12 indicates that MBLs exist in wild microbial populations in extreme environments, or environments with low anthropic impact, and under the appropriate antibiotic selective pressure could be captured and disseminated to pathogens.


    Organizational Affiliation

    Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Buenos Aires, Argentina.



Macromolecules
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
LRA-12A, B272uncultured bacterium BLR12Mutation(s): 0 
Gene Names: blaLRA-12AKSOIL_0006
EC: 3.5.2.6
UniProt
Find proteins for B5L5V5 (uncultured bacterium BLR12)
Explore B5L5V5 
Go to UniProtKB:  B5L5V5
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupB5L5V5
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.10 Å
  • R-Value Free: 0.235 
  • R-Value Work: 0.184 
  • R-Value Observed: 0.187 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 47.148α = 90
b = 80.616β = 98.83
c = 78.288γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
XDSdata reduction
SCALAdata scaling
PHASERphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2015-09-16
    Type: Initial release
  • Version 1.1: 2017-08-09
    Changes: Database references