Cryo-EM structure of alkane 1-monooxygenase AlkB-AlkG complex from Fontimonas thermophila

Experimental Data Snapshot

  • Resolution: 2.76 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation   3D Report Full Report

This is version 1.2 of the entry. See complete history


Structural basis for enzymatic terminal C-H bond functionalization of alkanes.

Chai, J.Guo, G.McSweeney, S.M.Shanklin, J.Liu, Q.

(2023) Nat Struct Mol Biol 30: 521-526

  • DOI: https://doi.org/10.1038/s41594-023-00958-0
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Alkane monooxygenase (AlkB) is a widely occurring integral membrane metalloenzyme that catalyzes the initial step in the functionalization of recalcitrant alkanes with high terminal selectivity. AlkB enables diverse microorganisms to use alkanes as their sole carbon and energy source. Here we present the 48.6-kDa cryo-electron microscopy structure of a natural fusion from Fontimonas thermophila between AlkB and its electron donor AlkG at 2.76 Å resolution. The AlkB portion contains six transmembrane helices with an alkane entry tunnel within its transmembrane domain. A dodecane substrate is oriented by hydrophobic tunnel-lining residues to present a terminal C-H bond toward a diiron active site. AlkG, an [Fe-4S] rubredoxin, docks via electrostatic interactions and sequentially transfers electrons to the diiron center. The archetypal structural complex presented reveals the basis for terminal C-H selectivity and functionalization within this broadly distributed evolutionary class of enzymes.

  • Organizational Affiliation

    Biology Department, Brookhaven National Laboratory, Upton, NY, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Alkane 1-monooxygenase471Fontimonas thermophilaMutation(s): 0 
Gene Names: SAMN04488120_10311
Membrane Entity: Yes 
Find proteins for A0A1I2I8Z9 (Fontimonas thermophila)
Explore A0A1I2I8Z9 
Go to UniProtKB:  A0A1I2I8Z9
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupA0A1I2I8Z9
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.76 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Structure Validation

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Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
Department of Energy (DOE, United States)United States--

Revision History  (Full details and data files)

  • Version 1.0: 2023-04-05
    Type: Initial release
  • Version 1.1: 2023-04-12
    Changes: Database references
  • Version 1.2: 2023-04-26
    Changes: Database references