Biotin-bound streptavidin

Experimental Data Snapshot

  • Resolution: 3.20 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

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This is version 1.3 of the entry. See complete history


Single particle cryo-EM reconstruction of 52 kDa streptavidin at 3.2 Angstrom resolution.

Fan, X.Wang, J.Zhang, X.Yang, Z.Zhang, J.C.Zhao, L.Peng, H.L.Lei, J.Wang, H.W.

(2019) Nat Commun 10: 2386-2386

  • DOI: https://doi.org/10.1038/s41467-019-10368-w
  • Primary Citation of Related Structures:  
    6J6J, 6J6K

  • PubMed Abstract: 

    The fast development of single-particle cryogenic electron microscopy (cryo-EM) has made it more feasible to obtain the 3D structure of well-behaved macromolecules with a molecular weight higher than 300 kDa at ~3 Å resolution. However, it remains a challenge to obtain the high-resolution structures of molecules smaller than 200 kDa using single-particle cryo-EM. In this work, we apply the Cs-corrector-VPP-coupled cryo-EM to study the 52 kDa streptavidin (SA) protein supported on a thin layer of graphene and embedded in vitreous ice. We are able to solve both the apo-SA and biotin-bound SA structures at near-atomic resolution using single-particle cryo-EM. We demonstrate that the method has the potential to determine the structures of molecules as small as 39 kDa.

  • Organizational Affiliation

    Ministry of Education Key Laboratory of Protein Sciences, Beijing Advanced Innovation Center for Structural Biology, Beijing Frontier Research Center of Biological Structures, School of Life Sciences, Tsinghua University, Beijing, 100084, China. hongweiwang@tsinghua.edu.cn.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
A, B, C, D
119Streptomyces avidiniiMutation(s): 0 
Find proteins for P22629 (Streptomyces avidinii)
Explore P22629 
Go to UniProtKB:  P22629
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP22629
Sequence Annotations
  • Reference Sequence
Small Molecules
Binding Affinity Annotations 
IDSourceBinding Affinity
BTN BindingDB:  6J6J Kd: 1 (nM) from 1 assay(s)
ΔH: min: -1.23e+2, max: -6.69e+1 (kJ/mol) from 12 assay(s)
Experimental Data & Validation

Experimental Data

  • Resolution: 3.20 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 
EM Software:
TaskSoftware PackageVersion

Structure Validation

View Full Validation Report

Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
Ministry of Science and Technology (China)China2016YFA0501100 to H.W.

Revision History  (Full details and data files)

  • Version 1.0: 2019-05-29
    Type: Initial release
  • Version 1.1: 2019-06-19
    Changes: Data collection, Database references
  • Version 1.2: 2019-11-06
    Changes: Data collection, Other
  • Version 1.3: 2020-08-05
    Changes: Data collection