The von Willebrand factor A domain of human capillary morphogenesis gene II, flexibly fused to the 1TEL crystallization chaperone

Experimental Data Snapshot

  • Resolution: 2.77 Å
  • R-Value Free: 0.228 
  • R-Value Work: 0.203 
  • R-Value Observed: 0.204 

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Crystals of TELSAM-target protein fusions that exhibit minimal crystal contacts and lack direct inter-TELSAM contacts.

Nawarathnage, S.Soleimani, S.Mathis, M.H.Bezzant, B.D.Ramirez, D.T.Gajjar, P.Bunn, D.R.Stewart, C.Smith, T.Pedroza Romo, M.J.Brown, S.Doukov, T.Moody, J.D.

(2022) Open Biol 12: 210271-210271

  • DOI: https://doi.org/10.1098/rsob.210271
  • Primary Citation of Related Structures:  
    7N1O, 7N2B

  • PubMed Abstract: 

    While conducting pilot studies into the usefulness of fusion to TELSAM polymers as a potential protein crystallization strategy, we observed novel properties in crystals of two TELSAM-target protein fusions, as follows. (i) A TELSAM-target protein fusion can crystallize more rapidly and with greater propensity than the same target protein alone. (ii) TELSAM-target protein fusions can be crystallized at low protein concentrations. This unprecedented observation suggests a route to crystallize proteins that can only be produced in microgram amounts. (iii) The TELSAM polymers themselves need not directly contact one another in the crystal lattice in order to form well-diffracting crystals. This novel observation is important because it suggests that TELSAM may be able to crystallize target proteins too large to allow direct inter-polymer contacts. (iv) Flexible TELSAM-target protein linkers can allow target proteins to find productive binding modes against the TELSAM polymer. (v) TELSAM polymers can adjust their helical rise to allow fused target proteins to make productive crystal contacts. (vi). Fusion to TELSAM polymers can stabilize weak inter-target protein crystal contacts. We report features of these TELSAM-target protein crystal structures and outline future work needed to validate TELSAM as a crystallization chaperone and determine best practices for its use.

  • Organizational Affiliation

    Department of Chemistry and Biochemistry, Brigham Young University, Provo, UT, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Transcription factor ETV6,Isoform 4 of Anthrax toxin receptor 2257Homo sapiensMutation(s): 6 
UniProt & NIH Common Fund Data Resources
Find proteins for P41212 (Homo sapiens)
Explore P41212 
Go to UniProtKB:  P41212
PHAROS:  P41212
Find proteins for P58335 (Homo sapiens)
Explore P58335 
Go to UniProtKB:  P58335
PHAROS:  P58335
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupsP41212P58335
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.77 Å
  • R-Value Free: 0.228 
  • R-Value Work: 0.203 
  • R-Value Observed: 0.204 
  • Space Group: P 65
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 103.396α = 90
b = 103.396β = 90
c = 56.55γ = 120
Software Package:
Software NamePurpose
Cootmodel building
autoPROCdata reduction
autoPROCdata scaling

Structure Validation

View Full Validation Report

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2021-06-09
    Type: Initial release
  • Version 1.1: 2021-06-16
    Changes: Database references, Structure summary
  • Version 1.2: 2022-03-09
    Changes: Database references
  • Version 1.3: 2023-10-18
    Changes: Data collection, Refinement description