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Quantitative interaction analysis permits molecular insights into functional NOX4 NADPH oxidase heterodimer assembly. | LitMetric

AI Article Synopsis

Article Abstract

Protein-protein interactions critically regulate many biological systems, but quantifying functional assembly of multipass membrane complexes in their native context is still challenging. Here, we combined modeling-assisted protein modification and information from human disease variants with a minimal-size fusion tag, split-luciferase-based approach to probe assembly of the NADPH oxidase 4 (NOX4)-p22 enzyme, an integral membrane complex with unresolved structure, which is required for electron transfer and generation of reactive oxygen species (ROS). Integrated analyses of heterodimerization, trafficking, and catalytic activity identified determinants for the NOX4-p22 interaction, such as heme incorporation into NOX4 and hot spot residues in transmembrane domains 1 and 4 in p22 Moreover, their effect on NOX4 maturation and ROS generation was analyzed. We propose that this reversible and quantitative protein-protein interaction technique with its small split-fragment approach will provide a protein engineering and discovery tool not only for NOX research, but also for other intricate membrane protein complexes, and may thereby facilitate new drug discovery strategies for managing NOX-associated diseases.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5995528PMC
http://dx.doi.org/10.1074/jbc.RA117.001045DOI Listing

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