6E1C

Crystal structure of a MauG-like protein associated with microbial copper homeostasis


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.62 Å
  • R-Value Free: 0.278 
  • R-Value Work: 0.198 
  • R-Value Observed: 0.205 

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This is version 1.2 of the entry. See complete history


Literature

MbnH is a diheme MauG-like protein associated with microbial copper homeostasis.

Kenney, G.E.Dassama, L.M.K.Manesis, A.C.Ross, M.O.Chen, S.Hoffman, B.M.Rosenzweig, A.C.

(2019) J Biol Chem 294: 16141-16151

  • DOI: 10.1074/jbc.RA119.010202
  • Primary Citation of Related Structures:  
    6E1C

  • PubMed Abstract: 
  • Methanobactins (Mbns) are ribosomally-produced, post-translationally modified peptidic copper-binding natural products produced under conditions of copper limitation. Genes encoding Mbn biosynthetic and transport proteins have been identified in a wide variety of bacteria, indicating a broader role for Mbns in bacterial metal homeostasis ...

    Methanobactins (Mbns) are ribosomally-produced, post-translationally modified peptidic copper-binding natural products produced under conditions of copper limitation. Genes encoding Mbn biosynthetic and transport proteins have been identified in a wide variety of bacteria, indicating a broader role for Mbns in bacterial metal homeostasis. Many of the genes in the Mbn operons have been assigned functions, but two genes usually present, mbnP and mbnH , encode uncharacterized proteins predicted to reside in the periplasm. MbnH belongs to the bacterial diheme cytochrome c peroxidase (bCcP)/MauG protein family, and MbnP contains no domains of known function. Here, we performed a detailed bioinformatic analysis of both proteins and have biochemically characterized MbnH from Methylosinus ( Ms. ) trichosporium OB3b. We note that the mbnH and mbnP genes typically co-occur and are located proximal to genes associated with microbial copper homeostasis. Our bioinformatics analysis also revealed that the bCcP/MauG family is significantly more diverse than originally appreciated, and that MbnH is most closely related to the MauG subfamily. A 2.6 Å resolution structure of Ms. trichosporium OB3b MbnH combined with spectroscopic data and peroxidase activity assays provided evidence that MbnH indeed more closely resembles MauG than bCcPs, although its redox properties are significantly different from those of MauG. The overall similarity of MbnH to MauG suggests that MbnH could post-translationally modify a macromolecule, such as internalized CuMbn or its uncharacterized partner protein, MbnP. Our results indicate that MbnH is a MauG-like diheme protein that is likely involved in microbial copper homeostasis and represents a new family within the bCcP/MauG superfamily.


    Organizational Affiliation

    Departments of Molecular Biosciences and Chemistry, Northwestern University, Evanston, Illinois 60208 amyr@northwestern.edu.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Di-heme enzymeA, B388Methylosinus trichosporium OB3bMutation(s): 0 
Gene Names: CQW49_07135
UniProt
Find proteins for A0A2D2CY72 (Methylosinus trichosporium OB3b)
Explore A0A2D2CY72 
Go to UniProtKB:  A0A2D2CY72
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.62 Å
  • R-Value Free: 0.278 
  • R-Value Work: 0.198 
  • R-Value Observed: 0.205 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 71.557α = 90
b = 85.757β = 90
c = 133.6γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
HKL-2000data scaling
PDB_EXTRACTdata extraction
HKL-2000data reduction
PHENIXphasing

Structure Validation

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Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)United StatesF32GM110934
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)United StatesGM118035

Revision History  (Full details and data files)

  • Version 1.0: 2019-07-17
    Type: Initial release
  • Version 1.1: 2020-01-01
    Changes: Author supporting evidence
  • Version 1.2: 2020-01-29
    Changes: Database references