Abstract
We examined the conformational preferences of mutants of thymosin β4, an actin monomer sequestering protein by NMR spectroscopy in 60% (v/v) trifluoroethanol. Under these conditions, the wild‐type thymosin β4 conformation consists of an α‐helix (helix I) extending from residues 5–16 with a more stable fragment from lysine 11 to lysine 16 and a second α‐helix (helix II) encompassing residues 31–39. The point mutations studied here are located in helix I or in the LKKTET segment (residues 17–22) that form the two main entities of interaction with the actin molecule. The α‐1H conformational shifts allow us to investigate the helicity of the polypeptides at the residue level and to correlate these structures with their biological activity. We determine that an extension of helix I at its C‐terminal end over the LKK‐segment results in loss of activity. The correct termination of this helix is connected to a specific orientation of the polypeptide essential for a cooperative action of the thymosin β4 binding entities required for full activity.
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Dates
Type | When |
---|---|
Created | 22 years, 5 months ago (March 11, 2003, 7:47 a.m.) |
Deposited | 1 year, 10 months ago (Oct. 15, 2023, 9:17 p.m.) |
Indexed | 11 months, 1 week ago (Sept. 15, 2024, 3:33 p.m.) |
Issued | 25 years, 2 months ago (June 1, 2000) |
Published | 25 years, 2 months ago (June 1, 2000) |
Published Online | 22 years ago (Aug. 18, 2003) |
Published Print | 25 years, 2 months ago (June 1, 2000) |
@article{Simenel_2000, title={Structural requirements for thymosin β4 in its contact with actin: An NMR‐analysis of thymosin β4 mutants in solution and correlation with their biological activity}, volume={267}, ISSN={1432-1033}, url={http://dx.doi.org/10.1046/j.1432-1327.2000.01380.x}, DOI={10.1046/j.1432-1327.2000.01380.x}, number={12}, journal={European Journal of Biochemistry}, publisher={Wiley}, author={Simenel, Catherine and Van Troys, Marleen and Vandekerckhove, Joël and Ampe, Christophe and Delepierre, Muriel}, year={2000}, month=jun, pages={3530–3538} }