The crystal structure of EncM L144M mutant complex with dioxygen under 15 bars O2 pressure

Experimental Data Snapshot

  • Resolution: 2.00 Å
  • R-Value Free: 0.272 
  • R-Value Work: 0.240 
  • R-Value Observed: 0.241 

wwPDB Validation   3D Report Full Report

This is version 1.2 of the entry. See complete history


Enzymatic control of dioxygen binding and functionalization of the flavin cofactor.

Saleem-Batcha, R.Stull, F.Sanders, J.N.Moore, B.S.Palfey, B.A.Houk, K.N.Teufel, R.

(2018) Proc Natl Acad Sci U S A 115: 4909-4914

  • DOI: https://doi.org/10.1073/pnas.1801189115
  • Primary Citation of Related Structures:  
    6FOQ, 6FOW, 6FP3, 6FY8, 6FY9, 6FYA, 6FYB, 6FYC, 6FYD, 6FYE, 6FYF, 6FYG

  • PubMed Abstract: 

    The reactions of enzymes and cofactors with gaseous molecules such as dioxygen (O 2 ) are challenging to study and remain among the most contentious subjects in biochemistry. To date, it is largely enigmatic how enzymes control and fine-tune their reactions with O 2 , as exemplified by the ubiquitous flavin-dependent enzymes that commonly facilitate redox chemistry such as the oxygenation of organic substrates. Here we employ O 2 -pressurized X-ray crystallography and quantum mechanical calculations to reveal how the precise positioning of O 2 within a flavoenzyme's active site enables the regiospecific formation of a covalent flavin-oxygen adduct and oxygenating species (i.e., the flavin-N5-oxide) by mimicking a critical transition state. This study unambiguously demonstrates how enzymes may control the O 2 functionalization of an organic cofactor as prerequisite for oxidative catalysis. Our work thus illustrates how O 2 reactivity can be harnessed in an enzymatic environment and provides crucial knowledge for future rational design of O 2 -reactive enzymes.

  • Organizational Affiliation

    Center for Biological Systems Analysis (ZBSA), University of Freiburg, 79104 Freiburg, Germany.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Putative FAD-dependent oxygenase EncM
A, B
464Streptomyces maritimusMutation(s): 1 
Gene Names: encM
Find proteins for Q9KHK2 (Streptomyces maritimus)
Explore Q9KHK2 
Go to UniProtKB:  Q9KHK2
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9KHK2
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.00 Å
  • R-Value Free: 0.272 
  • R-Value Work: 0.240 
  • R-Value Observed: 0.241 
  • Space Group: P 21 2 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 79.794α = 90
b = 87.358β = 90
c = 128.287γ = 90
Software Package:
Software NamePurpose
XDSdata reduction
SCALAdata scaling

Structure Validation

View Full Validation Report

Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
German Research FoundationGermanyTE931/2-1

Revision History  (Full details and data files)

  • Version 1.0: 2018-05-02
    Type: Initial release
  • Version 1.1: 2018-05-16
    Changes: Data collection, Database references
  • Version 1.2: 2024-01-17
    Changes: Data collection, Database references, Refinement description