ジャーナル: Sci Adv / 年: 2025 タイトル: MprF from is a promiscuous lipid scramblase with broad substrate specificity. 著者: Matthew T K Hankins / Matyas Parrag / Alisa A Garaeva / Jennifer C Earp / Markus A Seeger / Phillip J Stansfeld / Maike Bublitz / 要旨: The multiple peptide resistance factor (MprF) is a bifunctional membrane protein found in many bacteria, including and . MprF modifies inner leaflet lipid headgroups through aminoacylation and ...The multiple peptide resistance factor (MprF) is a bifunctional membrane protein found in many bacteria, including and . MprF modifies inner leaflet lipid headgroups through aminoacylation and translocates modified lipid to the outer leaflet. This activity provides increased resistance to antimicrobial agents. MprF presents a promising target in multiresistant pathogens, but structural information is limited and both substrate specificity and energization of MprF-mediated lipid transport are poorly understood. Here, we present the cryo-EM structure of MprF from (MprF) bound to a synthetic nanobody. MprF adopts an "open" conformation with a wide, lipid-exposed groove on the periplasmic side that induces a local membrane deformation in molecular dynamics simulations. Using an in vitro liposome transport assay, we demonstrate that MprF translocates a wide range of different lipids without an external energy source. This suggests that MprF is the first dedicated lipid scramblase to be characterized in bacteria.
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