8QT6

Cryo-EM structure of Streptococcus pneumoniae NADPH oxidase


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 2.29 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Starting Model: in silico
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wwPDB Validation   3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

Structural and mechanistic insights into Streptococcus pneumoniae NADPH oxidase.

Dubach, V.R.A.San Segundo-Acosta, P.Murphy, B.J.

(2024) Nat Struct Mol Biol 

  • DOI: https://doi.org/10.1038/s41594-024-01348-w
  • Primary Citation of Related Structures:  
    8QT6, 8QT7, 8QT9, 8QTA

  • PubMed Abstract: 

    Nicotinamide adenine dinucleotide phosphate (NADPH) oxidases (NOXs) have a major role in the physiology of eukaryotic cells by mediating reactive oxygen species production. Evolutionarily distant proteins with the NOX catalytic core have been found in bacteria, including Streptococcus pneumoniae NOX (SpNOX), which is proposed as a model for studying NOXs because of its high activity and stability in detergent micelles. We present here cryo-electron microscopy structures of substrate-free and nicotinamide adenine dinucleotide (NADH)-bound SpNOX and of NADPH-bound wild-type and F397A SpNOX under turnover conditions. These high-resolution structures provide insights into the electron-transfer pathway and reveal a hydride-transfer mechanism regulated by the displacement of F397. We conducted structure-guided mutagenesis and biochemical analyses that explain the absence of substrate specificity toward NADPH and suggest the mechanism behind constitutive activity. Our study presents the structural basis underlying SpNOX enzymatic activity and sheds light on its potential in vivo function.


  • Organizational Affiliation

    Redox and Metalloprotein Research Group, Max Planck Institute of Biophysics, Frankfurt am Main, Germany.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
FAD-binding FR-type domain-containing protein399Streptococcus pneumoniaeMutation(s): 0 
Gene Names: spr0531
Membrane Entity: Yes 
UniProt
Find proteins for Q8CZ28 (Streptococcus pneumoniae (strain ATCC BAA-255 / R6))
Explore Q8CZ28 
Go to UniProtKB:  Q8CZ28
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ8CZ28
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 2.29 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 
EM Software:
TaskSoftware PackageVersion
MODEL REFINEMENTPHENIX
MODEL REFINEMENTCoot
RECONSTRUCTIONcryoSPARC

Structure Validation

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Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Max Planck SocietyGermany--

Revision History  (Full details and data files)

  • Version 1.0: 2024-07-24
    Type: Initial release
  • Version 1.1: 2024-07-31
    Changes: Data collection, Database references