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MIRAVA POLYSCOPE – All in one and on for all: the perfect image
Science beyond Barriers

abberior dyes & labels

2023
Analytical Chemistry

Determining the Functional Oligomeric State of Membrane-Associated Protein Oligomers Forming Membrane Pores on Giant Lipid Vesicles

Authors:

Vandana Singh, Sabína Macharová, Petra Riegerová, Julia P. Steringer, Hans-Michael Müller, Fabio Lolicato, Walter Nickel, Martin Hof, and Radek Šachl

Keywords:

Membranes, Oligomerization, Oligomers, Peptides and proteins, Vesicles

Abstract:

Several peripheral membrane proteins are known to form membrane pores through multimerization. In many cases, in biochemical reconstitution experiments, a complex distribution of oligomeric states has been observed that may, in part, be irrelevant to their physiological functions. This phenomenon makes it difficult to identify the functional oligomeric states of membrane lipid interacting proteins, for example, during the formation of transient membrane pores. Using fibroblast growth factor 2 (FGF2) as an example, we present a methodology applicable to giant lipid vesicles by which functional oligomers can be distinguished from nonspecifically aggregated proteins without functionality. Two distinct populations of fibroblast growth factor 2 were identified with (i) dimers to hexamers and (ii) a broad population of higher oligomeric states of membrane-associated FGF2 oligomers significantly distorting the original unfiltered histogram of all detectable oligomeric species of FGF2. The presented statistical approach is relevant for various techniques for characterizing membrane-dependent protein oligomerization.

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Superresolution & Confocal Systems

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