Proteomic analysis of Escherichia coli detergent-resistant membranes (DRM)

Autoři: José E. Guzmán-Flores aff001;  Lidia Steinemann-Hernández aff001;  Luis E. González de la Vara aff002;  Marina Gavilanes-Ruiz aff003;  Tony Romeo aff004;  Adrián F. Alvarez aff001;  Dimitris Georgellis aff001
Působiště autorů: Departamento de Genética Molecular, Instituto de Fisiología Celular, Universidad Nacional Autónoma de México, México City, México aff001;  Departamento de Biotecnología y Bioquímica, Unidad Irapuato, Cinvestav-IPN, Irapuato, Gto, México aff002;  Departamento de Bioquímica, Facultad de Química, Universidad Nacional Autónoma de México, Mexico City, México aff003;  Department of Microbiology and Cell Science, IFAS, University of Florida, Gainesville, Florida, United States of America aff004
Vyšlo v časopise: PLoS ONE 14(10)
Kategorie: Research Article
doi: 10.1371/journal.pone.0223794


Membrane microdomains or lipid rafts compartmentalize cellular processes by laterally organizing membrane components. Such sub-membrane structures were mainly described in eukaryotic cells, but, recently, also in bacteria. Here, the protein content of lipid rafts in Escherichia coli was explored by mass spectrometry analyses of Detergent Resistant Membranes (DRM). We report that at least three of the four E. coli flotillin homologous proteins were found to reside in DRM, along with 77 more proteins. Moreover, the proteomic data were validated by subcellular localization, using immunoblot assays and fluorescence microscopy of selected proteins. Our results confirm the existence of lipid raft-like microdomains in the inner membrane of E. coli and represent the first comprehensive profiling of proteins in these bacterial membrane platforms.

Klíčová slova:

Cell membranes – Lipids – Lipoproteins – Membrane proteins – Outer membrane proteins – Signal peptides – Integral membrane proteins – Transmembrane transport proteins


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