4HR5

R2-like ligand-binding oxidase without metal cofactor


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.29 Å
  • R-Value Free: 0.237 
  • R-Value Work: 0.178 
  • R-Value Observed: 0.180 

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Ligand Structure Quality Assessment 


This is version 1.1 of the entry. See complete history


Literature

Direct observation of structurally encoded metal discrimination and ether bond formation in a heterodinuclear metalloprotein

Griese, J.J.Roos, K.Cox, N.Shafaat, H.S.Branca, R.M.M.Lehtio, J.Graslund, A.Lubitz, W.Siegbahn, P.E.M.Hogbom, M.

(2013) Proc Natl Acad Sci U S A 110: 17189-17194

  • DOI: https://doi.org/10.1073/pnas.1304368110
  • Primary Citation of Related Structures:  
    4HR0, 4HR4, 4HR5

  • PubMed Abstract: 

    Although metallocofactors are ubiquitous in enzyme catalysis, how metal binding specificity arises remains poorly understood, especially in the case of metals with similar primary ligand preferences such as manganese and iron. The biochemical selection of manganese over iron presents a particularly intricate problem because manganese is generally present in cells at a lower concentration than iron, while also having a lower predicted complex stability according to the Irving-Williams series (Mn(II) < Fe(II) < Ni(II) < Co(II) < Cu(II) > Zn(II)). Here we show that a heterodinuclear Mn/Fe cofactor with the same primary protein ligands in both metal sites self-assembles from Mn(II) and Fe(II) in vitro, thus diverging from the Irving-Williams series without requiring auxiliary factors such as metallochaperones. Crystallographic, spectroscopic, and computational data demonstrate that one of the two metal sites preferentially binds Fe(II) over Mn(II) as expected, whereas the other site is nonspecific, binding equal amounts of both metals in the absence of oxygen. Oxygen exposure results in further accumulation of the Mn/Fe cofactor, indicating that cofactor assembly is at least a two-step process governed by both the intrinsic metal specificity of the protein scaffold and additional effects exerted during oxygen binding or activation. We further show that the mixed-metal cofactor catalyzes a two-electron oxidation of the protein scaffold, yielding a tyrosine-valine ether cross-link. Theoretical modeling of the reaction by density functional theory suggests a multistep mechanism including a valyl radical intermediate.


  • Organizational Affiliation

    Stockholm Center for Biomembrane Research, Department of Biochemistry and Biophysics and Department of Physics, Stockholm University, SE-106 91 Stockholm, Sweden.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Ribonuleotide reductase small subunit316Geobacillus kaustophilus HTA426Mutation(s): 0 
Gene Names: GK2771
EC: 1.17.4.1
UniProt
Find proteins for Q5KW80 (Geobacillus kaustophilus (strain HTA426))
Explore Q5KW80 
Go to UniProtKB:  Q5KW80
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ5KW80
Sequence Annotations
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  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
PLM
Query on PLM

Download Ideal Coordinates CCD File 
B [auth A]PALMITIC ACID
C16 H32 O2
IPCSVZSSVZVIGE-UHFFFAOYSA-N
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.29 Å
  • R-Value Free: 0.237 
  • R-Value Work: 0.178 
  • R-Value Observed: 0.180 
  • Space Group: I 2 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 56.757α = 90
b = 97.043β = 90
c = 127.64γ = 90
Software Package:
Software NamePurpose
DNAdata collection
PHENIXmodel building
PHENIXrefinement
XDSdata reduction
XDSdata scaling
PHENIXphasing

Structure Validation

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Ligand Structure Quality Assessment 


Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2013-10-16
    Type: Initial release
  • Version 1.1: 2013-11-06
    Changes: Database references