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Characterisation of the conformational preference and dynamics of the intrinsically disordered N-terminal region of Beclin 1 by NMR spectroscopy


Yao, S; Lee, EF; Pettikiriarachchi, A; Evangelista, M; Keizer, DW; Fairlie, WD
2016-06-08
Biochim Biophys Acta
Journal Article
Beclin 1 is a 450 amino acid protein that plays critical roles in the early stages of autophagosome formation. We recently reported the successful expression, purification and structural characterisation of the entire N-terminal region of Beclin 1 (residues 1-150), including its backbone NMR chemical shift assignments. Based on assigned backbone NMR chemical shifts, it has been established that the N-terminal region of Beclin 1 (1-150), including the BH3 domain (112-123), is intrinsically disordered in the absence of its interaction partners. Here, a detailed study of its conformational preference and backbone dynamics obtained from an analysis of its secondary structure populations using the delta2D method, and the measurements of effective hydrodynamic radius as well as 1H temperature coefficients, 1H solvent exchange rates, and 15N relaxation parameters of backbone amides using NMR spectroscopy is reported. These data provide further evidence for the intrinsically disordered nature of the N-terminal region of Beclin 1 and support the view that the helical conformation adopted by the Beclin 1 BH3 domain upon interaction with binding partners such as BCL-2 pro-survival proteins is likely induced rather than pre-existing.
Elsevier
Structural Biology
10.1016/j.bbapap.2016.06.005
27288992
Refer to article for additional funding acknowledgements
Refer to copyright notice on published article.

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Creation Date 2016-06-17 03:01:36 Last Modified 2018-07-11 09:38:16