Structural basis for PoxtA-mediated resistance to phenicol and oxazolidinone antibiotics.

ABSTRACT: PoxtA and OptrA are ATP binding cassette (ABC) proteins of the F subtype (ABCF). They confer resistance to oxazolidinone and phenicol antibiotics, such as linezolid and chloramphenicol, which stall translating ribosomes when certain amino acids are present at a defined position in the nascent polypeptide chain. These proteins are often encoded on mobile genetic elements, facilitating their rapid spread amongst Gram-positive bacteria, and are thought to confer resistance by binding to the ribosome and dislodging the bound antibiotic. However, the mechanistic basis of this resistance remains unclear. Here we refine the PoxtA spectrum of action, demonstrate alleviation of linezolid-induced context-dependent translational stalling, and present cryo-electron microscopy structures of PoxtA in co

SUBMITTER: Crowe-McAuliffe C 

PROVIDER: S-EPMC8987054 | biostudies-literature | 2022 Apr

REPOSITORIES: biostudies-literature