8BK8

Cryo-EM structure of beta-galactosidase at 2.9 A resolution plunged 205 ms after mixing with apoferritin


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 2.90 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Time-resolved cryo-EM using a combination of droplet microfluidics with on-demand jetting.

Torino, S.Dhurandhar, M.Stroobants, A.Claessens, R.Efremov, R.G.

(2023) Nat Methods 20: 1400-1408

  • DOI: https://doi.org/10.1038/s41592-023-01967-z
  • Primary Citation of Related Structures:  
    8BK7, 8BK8, 8BK9, 8BKA, 8BKB, 8BKG, 8BKZ, 8BL2, 8BL7, 8BLC, 8BLD, 8BLE, 8BLF, 8BLY, 8BM0, 8BM1, 8BMD, 8BMO, 8BMT

  • PubMed Abstract: 

    Single-particle cryogenic electron microscopy (cryo-EM) allows reconstruction of high-resolution structures of proteins in different conformations. Protein function often involves transient functional conformations, which can be resolved using time-resolved cryo-EM (trEM). In trEM, reactions are arrested after a defined delay time by rapid vitrification of protein solution on the EM grid. Despite the increasing interest in trEM among the cryo-EM community, making trEM samples with a time resolution below 100 ms remains challenging. Here we report the design and the realization of a time-resolved cryo-plunger that combines a droplet-based microfluidic mixer with a laser-induced generator of microjets that allows rapid reaction initiation and plunge-freezing of cryo-EM grids. Using this approach, a time resolution of 5 ms was achieved and the protein density map was reconstructed to a resolution of 2.1 Å. trEM experiments on GroEL:GroES chaperonin complex resolved the kinetics of the complex formation and visualized putative short-lived conformations of GroEL-ATP complex.


  • Organizational Affiliation

    Center for Structural Biology, Vlaams Instituut voor Biotechnologie, Brussels, Belgium.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Beta-galactosidase
A, B, C, D
1,031Escherichia coliMutation(s): 0 
Gene Names: lacZb0344JW0335
EC: 3.2.1.23
UniProt
Find proteins for P00722 (Escherichia coli (strain K12))
Explore P00722 
Go to UniProtKB:  P00722
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP00722
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 2.90 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 
EM Software:
TaskSoftware PackageVersion
MODEL REFINEMENTPHENIX1.20.1

Structure Validation

View Full Validation Report



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
European Research Council (ERC)European Union726436
Research Foundation - Flanders (FWO)BelgiumG0H5916N
Research Foundation - Flanders (FWO)BelgiumG054617N

Revision History  (Full details and data files)

  • Version 1.0: 2023-08-09
    Type: Initial release
  • Version 1.1: 2023-08-30
    Changes: Data collection, Database references
  • Version 1.2: 2023-09-13
    Changes: Database references