What is it about?
Protein crystallography is a reliable technique that can be used to find the structure of small proteins, which is key information for drug design and development. However, a major limitation of protein crystallography is that most proteins do not readily crystallize independently; only about 30% are naturally crystallizable, limiting the utility of current visualization methods. The Human Translocation ETS Leukemia protein Sterile Alpha Motif (TELSAM) is a protein crystallization chaperone that has shown promise in aiding the crystallization of recalcitrant proteins. Previous studies have demonstrated that TELSAM can significantly enhance the crystallization propensity of target proteins compared to the proteins alone. In this study, we explore the effect of different TELSAM fusions on the crystallization ability, as the number of target proteins per turn of the polymer (target protein density) differs in each fusion. We tested 3 different TELSAM fusions with two target proteins in this study. At the same time, we tested how the availability of the His tag can affect the crystallization of the protein because cleaving off the His tag needs additional steps and time.
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Why is it important?
We were able to obtain crystals for most of our constructs and publish the structures of 3 different TELSAM fusions (PDB: 9DOC, PDB: 9CPL, PDB: 9O0H). We obtained the highest resolution (1.2Å) for one of our target proteins (vWA) and for TELSAM. The presence of a His tag was found to have either a positive or negative effect, depending on the display density and the specific target protein. This study enables us to recommend the most suitable TELSAM fusion strategy for crystallizing proteins of interest. These insights enhance the utility of TELSAM fusion crystallography, accelerating structural biology research and paving the way for novel approaches in drug design.
Perspectives
I hope this study will extend the applications of TELSAM and enhance the crystallization of recalcitrant proteins. It will open new pathways in future protein research and drug development.
Prasadika Samarawickrama Hetti Arachchige
Brigham Young University
Read the Original
This page is a summary of: What is the best target protein density for TELSAM fusion crystallization, Structural Dynamics, March 2025, American Institute of Physics,
DOI: 10.1063/4.0000409.
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Resources
RCSB PDB
The von Willebrand factor A domain of human capillary morphogenesis gene II, flexibly fused to the 1TEL crystallization chaperone, Thr-Val linker variant, at 1.2 Angstrom resolution
RCSB PDB
The ubiquitin-associated domain of human thirty-eight negative kinase 1, fused to the 2TEL crystallization chaperone via a 2-glycine linker
RCSB PDB
The ubiquitin-associated domain of human thirty-eight negative kinase 1, fused to the 3TEL crystallization chaperone via a 2-glycine linker
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