Crystal Structure of the Debrominase Bmp8 C82A in Complex with 2,3,4-tribromopyrrole

Experimental Data Snapshot

  • Resolution: 3.19 Å
  • R-Value Free: 0.282 
  • R-Value Work: 0.232 
  • R-Value Observed: 0.234 

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Bacterial Tetrabromopyrrole Debrominase Shares a Reductive Dehalogenation Strategy with Human Thyroid Deiodinase.

Chekan, J.R.Lee, G.Y.El Gamal, A.Purdy, T.N.Houk, K.N.Moore, B.S.

(2019) Biochemistry 58: 5329-5338

  • DOI: https://doi.org/10.1021/acs.biochem.9b00318
  • Primary Citation of Related Structures:  
    6OHI, 6OHJ

  • PubMed Abstract: 

    Enzymatic dehalogenation is an important and well-studied biological process in both the detoxification and catabolism of small molecules, many of which are anthropogenic in origin. However, dedicated dehalogenation reactions that replace a halogen atom with a hydrogen are rare in the biosynthesis of natural products. In fact, the debrominase Bmp8 is the only known example. It catalyzes the reductive debromination of the coral settlement cue and the potential human toxin 2,3,4,5-tetrabromopyrrole as part of the biosynthesis of the antibiotic pentabromopseudilin. Using a combination of protein crystallography, mutagenesis, and computational modeling, we propose a catalytic mechanism for Bmp8 that is reminiscent of that catalyzed by human deiodinases in the maintenance of thyroid hormones. The identification of the key catalytic residues enabled us to recognize divergent functional homologues of Bmp8. Characterization of one of these homologues demonstrated its debromination activity even though it is found in a completely distinct genomic context. This observation suggests that additional enzymes outside those associated with the tetrabromopyrrole biosynthetic pathway may be able to alter the lifetime of this compound in the environment.

  • Organizational Affiliation

    Skaggs School of Pharmacy and Pharmaceutical Sciences , University of California San Diego , La Jolla , California 92093 , United States.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Debrominase Bmp8
A, B
195Marinomonas mediterranea MMB-1Mutation(s): 1 
Gene Names: Marme_4087
Find proteins for F2K073 (Marinomonas mediterranea (strain ATCC 700492 / JCM 21426 / NBRC 103028 / MMB-1))
Explore F2K073 
Go to UniProtKB:  F2K073
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupF2K073
Sequence Annotations
  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
Query on MKV

Download Ideal Coordinates CCD File 
D [auth B]2,3,4-tribromo-1H-pyrrole
C4 H2 Br3 N
Query on SO4

Download Ideal Coordinates CCD File 
O4 S
Experimental Data & Validation

Experimental Data

  • Resolution: 3.19 Å
  • R-Value Free: 0.282 
  • R-Value Work: 0.232 
  • R-Value Observed: 0.234 
  • Space Group: P 61 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 65.817α = 90
b = 65.817β = 90
c = 288.848γ = 120
Software Package:
Software NamePurpose
XDSdata reduction
AutoPROCdata scaling

Structure Validation

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Ligand Structure Quality Assessment 

Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)United States--
National Science Foundation (NSF, United States)United States--

Revision History  (Full details and data files)

  • Version 1.0: 2019-05-29
    Type: Initial release
  • Version 1.1: 2019-06-05
    Changes: Data collection, Database references
  • Version 1.2: 2019-11-27
    Changes: Author supporting evidence
  • Version 1.3: 2020-01-08
    Changes: Database references