The TELSAM Protein Polymer significantly Improves the Speed of Crystallization of target proteins

Presented During:

08/01/2021: 12:20 PM - 12:40 PM


2021: 71st ACA Annual Meeting

Session Type:

Oral Talk 

Presenting Author :

sara soleimani  

Additional Author(s):

Supeshala Sarath Nawarathnage  
Parag Gajjar  
Brigham Young University
Braydan Bezzant  
Brigham Young University
Moriah Longhurst  
Brigham Young University
Tobin Smith  
Brigham Young University
Maria Pedroza  
Brigham Young University
Seth Brown  
Brigham Young University
Tzanko Duokov  
Macromolecular Crystallography Group, Structural Molecular Biology Resource, SSRL
James Moody  
Diana Ramirez  
California State Univesity, Chico

Abstract Body:

The development of novel crystallization approaches that require less time, effort, and expense can significantly increase the success rate of target proteins crystallization and accelerate structure determination of many biotechnology and disease-relevant proteins. Specifically, improved crystallization methods will accelerate study of the molecular mechanisms of disease. Polymer forming crystallization chaperones (PFCCs) are a potentially better type of crystallization chaperone. One potential PFCC is the sterile alpha motif domain (SAM) of the human Translocation ETS Leukemia protein. In this study, the effectiveness of TELSAM protein polymers to reliably form well-diffracting crystals of Capillary Morphogenesis Gene 2 (CMG2) is investigated. CMG2 is involved in cancer, where its overexpression is associated with increased tumor grade and poor patient survival. The long-term goal of this research is to develop crystallization methods that could lead to diffraction-quality crystals from greater than 70% of targeted proteins of interest. A TELSAM-target protein fusion can crystallize more rapidly than the same target protein alone. In this work the results on CMG2 alone, 1TEL-flex-CMG2, 1TEL-flex-CMG2+PGM, 1TEL-flex-DARPin will be presented. TELSAM accelerates the rate of crystal formation by as much as 27-fold versus the target protein alone, likely by using avidity to stabilize weak crystal contacts made by the target protein. In addition, TELSAM-target protein fusions can form well-ordered, diffracting crystals using flexible TELSAM-target linkers. The TELSAM polymers themselves need not directly touch one another in the crystal lattice to make crystal lattice. We conclude that TELSAM is a powerful crystallization chaperone warranting future investigation.

Additional Information - ORAL (2021)

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