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- PDB-7jz6: The Cryo-EM structure of the Catalase-peroxidase from Escherichia coli -

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Basic information

Entry
Database: PDB / ID: 7jz6
TitleThe Cryo-EM structure of the Catalase-peroxidase from Escherichia coli
ComponentsCatalase-peroxidase
KeywordsOXIDOREDUCTASE / catalase-peroxidase
Function / homology
Function and homology information


catalase-peroxidase / catalase activity / hydrogen peroxide catabolic process / cellular response to hydrogen peroxide / heme binding / metal ion binding / cytosol
Similarity search - Function
Catalase-peroxidase haem / Peroxidases heam-ligand binding site / Peroxidase, active site / Peroxidases active site signature. / Plant heme peroxidase family profile. / Haem peroxidase / Peroxidase / Peroxidases proximal heme-ligand signature. / Haem peroxidase superfamily
Similarity search - Domain/homology
PROTOPORPHYRIN IX CONTAINING FE / Catalase-peroxidase
Similarity search - Component
Biological speciesEscherichia coli (E. coli)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 2.53 Å
AuthorsSu, C.-C.
Funding support United States, 1items
OrganizationGrant numberCountry
National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID) United States
CitationJournal: Nat Methods / Year: 2021
Title: A 'Build and Retrieve' methodology to simultaneously solve cryo-EM structures of membrane proteins.
Authors: Chih-Chia Su / Meinan Lyu / Christopher E Morgan / Jani Reddy Bolla / Carol V Robinson / Edward W Yu /
Abstract: Single-particle cryo-electron microscopy (cryo-EM) has become a powerful technique in the field of structural biology. However, the inability to reliably produce pure, homogeneous membrane protein ...Single-particle cryo-electron microscopy (cryo-EM) has become a powerful technique in the field of structural biology. However, the inability to reliably produce pure, homogeneous membrane protein samples hampers the progress of their structural determination. Here, we develop a bottom-up iterative method, Build and Retrieve (BaR), that enables the identification and determination of cryo-EM structures of a variety of inner and outer membrane proteins, including membrane protein complexes of different sizes and dimensions, from a heterogeneous, impure protein sample. We also use the BaR methodology to elucidate structural information from Escherichia coli K12 crude membrane and raw lysate. The findings demonstrate that it is possible to solve high-resolution structures of a number of relatively small (<100 kDa) and less abundant (<10%) unidentified membrane proteins within a single, heterogeneous sample. Importantly, these results highlight the potential of cryo-EM for systems structural proteomics.
History
DepositionSep 1, 2020Deposition site: RCSB / Processing site: RCSB
Revision 1.0Jan 20, 2021Provider: repository / Type: Initial release
Revision 1.1Mar 6, 2024Group: Data collection / Database references / Category: chem_comp_atom / chem_comp_bond / database_2
Item: _database_2.pdbx_DOI / _database_2.pdbx_database_accession

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Structure visualization

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Assembly

Deposited unit
A: Catalase-peroxidase
B: Catalase-peroxidase
C: Catalase-peroxidase
D: Catalase-peroxidase
hetero molecules


Theoretical massNumber of molelcules
Total (without water)322,9168
Polymers320,4504
Non-polymers2,4664
Water32418
1


  • Idetical with deposited unit
  • defined by author
TypeNameSymmetry operationNumber
identity operation1_5551
Buried area18460 Å2
ΔGint-140 kcal/mol
Surface area99890 Å2

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Components

#1: Protein
Catalase-peroxidase / CP / Peroxidase/catalase / KatG


Mass: 80112.586 Da / Num. of mol.: 4 / Source method: isolated from a natural source / Source: (natural) Escherichia coli (E. coli) / References: UniProt: A0A037YMJ1, catalase-peroxidase
#2: Chemical
ChemComp-HEM / PROTOPORPHYRIN IX CONTAINING FE / HEME


Mass: 616.487 Da / Num. of mol.: 4
Source method: isolated from a genetically manipulated source
Formula: C34H32FeN4O4
#3: Water ChemComp-HOH / water


Mass: 18.015 Da / Num. of mol.: 18 / Source method: isolated from a natural source / Formula: H2O
Has ligand of interestN

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Experimental details

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Experiment

ExperimentMethod: ELECTRON MICROSCOPY
EM experimentAggregation state: PARTICLE / 3D reconstruction method: single particle reconstruction

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Sample preparation

ComponentName: KatG / Type: COMPLEX / Entity ID: #1 / Source: NATURAL
Molecular weightExperimental value: NO
Source (natural)Organism: Escherichia coli (E. coli)
Buffer solutionpH: 7.5
SpecimenConc.: 0.5 mg/ml / Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
VitrificationCryogen name: ETHANE

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Electron microscopy imaging

Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company
MicroscopyModel: FEI TITAN KRIOS
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: FLOOD BEAM
Electron lensMode: BRIGHT FIELD
Image recordingElectron dose: 50 e/Å2 / Film or detector model: GATAN K3 BIOQUANTUM (6k x 4k)

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Processing

EM softwareName: cryoSPARC / Version: 1.4 / Category: 3D reconstruction
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
3D reconstructionResolution: 2.53 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 123643 / Symmetry type: POINT

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