3VPE

Crystal Structure of Metallo-beta-Lactamase SMB-1


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.60 Å
  • R-Value Free: 0.200 
  • R-Value Work: 0.165 
  • R-Value Observed: 0.166 

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This is version 1.0 of the entry. See complete history


Literature

Structural Insights into the Subclass B3 Metallo-beta-Lactamase SMB-1 and the Mode of Inhibition by the Common Metallo- -Lactamase Inhibitor Mercaptoacetate

Wachino, J.Yamaguchi, Y.Mori, S.Kurosaki, H.Arakawa, Y.Shibayama, K.

(2013) Antimicrob Agents Chemother 57: 101-109

  • DOI: 10.1128/AAC.01264-12
  • Primary Citation of Related Structures:  
    3VPE, 3VQZ

  • PubMed Abstract: 
  • A novel subclass B3 metallo-β-lactamase (MBL), SMB-1, recently identified from a Serratia marcescens clinical isolate, showed a higher hydrolytic activity against a wide range of β-lactams than did the other subclass B3 MBLs, i.e., BJP-1 and FEZ-1, from environmental bacteria ...

    A novel subclass B3 metallo-β-lactamase (MBL), SMB-1, recently identified from a Serratia marcescens clinical isolate, showed a higher hydrolytic activity against a wide range of β-lactams than did the other subclass B3 MBLs, i.e., BJP-1 and FEZ-1, from environmental bacteria. To identify the mechanism underlying the differences in substrate specificity among the subclass B3 MBLs, we determined the structure of SMB-1, using 1.6-Å diffraction data. Consequently, we found that SMB-1 reserves a space in the active site to accommodate β-lactam, even with a bulky R1 side chain, due to a loss of amino acid residues corresponding to F31 and L226 of BJP-1, which protrude into the active site to prevent β-lactam from binding. The protein also possesses a unique amino acid residue, Q157, which probably plays a role in recognition of β-lactams via the hydrogen bond interaction, which is missing in BJP-1 and FEZ-1, whose K(m) values for β-lactams are particularly high. In addition, we determined the mercaptoacetate (MCR)-complexed SMB-1 structure and revealed the mode of its inhibition by MCR: the thiolate group bridges to two zinc ions (Zn1 and Zn2). One of the carboxylate oxygen atoms of MCR makes contact with Zn2 and Ser221, and the other makes contact with T223 and a water molecule. Our results demonstrate the possibility that MCR could be a potent inhibitor for subclass B3 MBLs and that the screening technique using MCR as an inhibitor would be effective for detecting subclass B3 MBL producers.


    Organizational Affiliation

    Department of Bacteriology II, National Institute of Infectious Diseases, Musashi-Murayama, Tokyo, Japan. wachino@nih.go.jp



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Metallo-beta-lactamaseA262Serratia marcescensMutation(s): 0 
Gene Names: blaSMB-1SMB-1
EC: 3.5.2.6
UniProt
Find proteins for G5ELM3 (Serratia marcescens)
Explore G5ELM3 
Go to UniProtKB:  G5ELM3
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.60 Å
  • R-Value Free: 0.200 
  • R-Value Work: 0.165 
  • R-Value Observed: 0.166 
  • Space Group: P 31
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 67.829α = 90
b = 67.829β = 90
c = 48.67γ = 120
Software Package:
Software NamePurpose
HKL-2000data collection
AMoREphasing
REFMACrefinement
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2013-02-13
    Type: Initial release