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Assessing protein conformational landscapes: integration of DEER data in Maximum Occurrence analysis

Abstract

The properties of the conformational landscape of a biomolecule is of capital importance to understand its function. It is widely accepted that a statistical ensemble is far more representative than a single structure, especially for proteins with disordered regions. While experimental data provide the most important handle on the conformational variability that the system is experiencing, they usually report on either time or ensemble averages. Since the available number of conformations largely outnumber the (independent) available experimental data, the latter can be equally well reproduced by a variety of ensembles. We have proposed the Maximum Occurrence (MaxOcc) approach to provide an upper bound of the statistical weight of each conformation. This method is expected to converge towards the true statistical weights by increasing the number of independent experimental datasets. In this paper we explore the ability of DEER (Double Electron Electron Resonance) data, which report on the distance distrbution between two spin labels attached to a biomolecule, to restrain the MaxOcc values and its complementarity to previously introduced experimental techniques such as NMR and Small-Angle X-ray Scattering. We here present the case of Ca2+ bound calmodulin (CaM) as a test case and show that DEER data impose a sizeable reduction of the conformational space described by high MaxOcc conformations.

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Publication details

The article was accepted on 12 Oct 2018 and first published on 13 Oct 2018


Article type: Paper
DOI: 10.1039/C8CP06195E
Citation: Phys. Chem. Chem. Phys., 2018, Accepted Manuscript
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    Assessing protein conformational landscapes: integration of DEER data in Maximum Occurrence analysis

    L. Gigli, W. Andralojc, A. Dalaloyan, G. Parigi, E. Ravera, D. Goldfarb and C. Luchinat, Phys. Chem. Chem. Phys., 2018, Accepted Manuscript , DOI: 10.1039/C8CP06195E

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