3LEZ

Crystal structure of a halotolerant bacterial beta-lactamase


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.25 Å
  • R-Value Free: 0.174 
  • R-Value Work: 0.154 
  • R-Value Observed: 0.155 

wwPDB Validation   3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

An antibiotic-resistance enzyme from a deep-sea bacterium

Toth, M.Smith, C.Frase, H.Mobashery, S.Vakulenko, S.

(2010) J Am Chem Soc 132: 816-823

  • DOI: 10.1021/ja908850p
  • Primary Citation of Related Structures:  
    3LEZ

  • PubMed Abstract: 
  • We describe herein a highly proficient class A beta-lactamase OIH-1 from the bacterium Oceanobacillus iheyensis, whose habitat is the sediment at a depth of 1050 m in the Pacific Ocean. The OIH-1 structure was solved by molecular replacement and refined at 1 ...

    We describe herein a highly proficient class A beta-lactamase OIH-1 from the bacterium Oceanobacillus iheyensis, whose habitat is the sediment at a depth of 1050 m in the Pacific Ocean. The OIH-1 structure was solved by molecular replacement and refined at 1.25 A resolution. OIH-1 has evolved to be an extremely halotolerant beta-lactamase capable of hydrolyzing its substrates in the presence of NaCl at saturating concentration. Not only is this the most highly halotolerant bacterial enzyme structure known to date, it is also the highest resolution halophilic protein structure yet determined. Evolution of OIH-1 in the salinity of the ocean has resulted in a molecular surface that is coated with acidic residues, a marked difference from beta-lactamases of terrestrial sources. OIH-1 is the first example of an antibiotic-resistance enzyme that has evolved in the depths of the ocean in isolation from clinical selection and gives us an extraordinary glimpse into protein evolution under extreme conditions. It represents evidence for the existence of a reservoir of antibiotic-resistance enzymes in nature among microbial populations from deep oceanic sources.


    Organizational Affiliation

    Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, Indiana 46556, USA.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Beta-lactamase A260Oceanobacillus iheyensisMutation(s): 0 
Gene Names: OB2793oih-1
EC: 3.5.2.6
Find proteins for Q8EMP8 (Oceanobacillus iheyensis (strain DSM 14371 / CIP 107618 / JCM 11309 / KCTC 3954 / HTE831))
Explore Q8EMP8 
Go to UniProtKB:  Q8EMP8
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.25 Å
  • R-Value Free: 0.174 
  • R-Value Work: 0.154 
  • R-Value Observed: 0.155 
  • Space Group: P 31 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 55.98α = 90
b = 55.98β = 90
c = 165.89γ = 120
Software Package:
Software NamePurpose
Blu-Icedata collection
MOLREPphasing
PHENIXrefinement
XDSdata reduction
XSCALEdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2010-02-02
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance