In vitro Assay to Evaluate Cation Transport of Ionophores.
Bio Protoc 2022;
12:e4552. [PMID:
36532682 PMCID:
PMC9724011 DOI:
10.21769/bioprotoc.4552]
[Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2022] [Revised: 09/19/2022] [Accepted: 09/19/2022] [Indexed: 11/19/2022] Open
Abstract
Ion homeostasis is a fundamental regulator of cellular processes and depends upon lipid membranes, which function as ion permeability barriers. Ionophores facilitate ion transport across cell membranes and offer a way to manipulate cellular ion composition. Here, we describe a calcein quenching assay based on large unilamellar vesicles that we used to evaluate divalent cation transport of the ionophore 4-Br-A23187. This assay can be used to study metal transport by ionophores and membrane proteins, under well-defined conditions. This protocol was validated in: Proteomics (2022), DOI: 10.1002/pmic.202200061 Graphical abstract.
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