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Structural basis for PoxtA-mediated resistance to Phenicol and Oxazolidinone antibiotics

ABSTRACT: Structural basis for PoxtA-mediated resistance to Phenicol and Oxazolidinone antibiotics

PROVIDER: PRJNA743321 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR15030831_1.fastq.gz	Fastqsanger.gz
	SRR15030831_2.fastq.gz	Fastqsanger.gz
	SRR15030832_1.fastq.gz	Fastqsanger.gz
	SRR15030832_2.fastq.gz	Fastqsanger.gz
	SRR15030833_1.fastq.gz	Fastqsanger.gz

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Structural basis for PoxtA-mediated resistance to Phenicol and Oxazolidinone antibiotics

Project description:PoxtA and OptrA are ATP binding cassette (ABC) proteins of the F subtype (ABCF) that confer resistance to oxazolidinone, such as linezolid, and phenicol antibiotics, such as chloramphenicol. PoxtA/OptrA are often encoded on mobile genetic elements, facilitating their rapid spread amongst Gram-positive bacteria. These target protection proteins are thought to confer resistance by binding to the ribosome and dislodging the antibiotics from their binding sites. However, a structural basis for their mechanism of action has been lacking. Here by investigating 5'P mRNA decay intermediates, that provide ribosome protection data, we show that PoxtA protects against Linezolid specific stalls. Furthermore, we present cryo-electron microscopy structures of PoxtA in complex with the Enterococcus faecalis 70S ribosome at 2.9–3.1 Å, as well as the complete E. faecalis 70S ribosome at 2.2–2.5 Å. The structures reveal that PoxtA binds within the ribosomal E-site with its antibiotic resistance domain (ARD) extending towards the peptidyltransferase center (PTC) on the large ribosomal subunit. At its closest point, the ARD of PoxtA is still located >15 Å from the linezolid and chloramphenicol binding sites, suggesting that drug release is elicited indirectly. Instead, we observe that the ARD of PoxtA perturbs the CCA-end of the P-site tRNA causing it to shift by ~4 Å out of the PTC, which correlates with a register shift of one amino acid for the attached nascent polypeptide chain. Given that linezolid and chloramphenicol are context-specific translation elongation inhibitors, we postulate that PoxtA/OptrA confer resistance to oxazolidinones and phenicols indirectly by perturbing the P-site tRNA and thereby altering the conformation of the attached nascent chain to disrupt the drug binding site.

2022-02-12 | GSE179348 | GEO

Structural basis of ABCF-mediated resistance to pleuromutilin, lincosamide, and streptogramin A antibiotics in Gram-positive pathogens

Project description:Structural basis of ABCF-mediated resistance to pleuromutilin, lincosamide, and streptogramin A antibiotics in Gram-positive pathogens

| PRJNA680786 | ENA

Structural basis for DNMT3A-mediated de novo DNA methylation

Project description:Structural basis for DNMT3A-mediated de novo DNA methylation

| PRJNA388375 | ENA

Structural Basis for Target-Directed MicroRNA Degradation

Project description:Structural Basis for Target-Directed MicroRNA Degradation

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Structural basis of virulence activation in Francisella tularensis

Project description:Structural basis of virulence activation in Francisella tularensis

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The structural basis for cohesin/CTCF anchored loops

Project description:The structural basis for cohesin/CTCF anchored loops

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Structural basis of a novel Interferon b signaling axis mediated via the ifnar1 receptor

Project description:Type I interferons (IFNs) are a family of cytokines that play an important role in regulating immune responses to pathogens and tumors and are used therapeutically. All IFNs are considered to signal via the heterodimeric IFNAR1-IFNAR2 complex, yet some subtypes such as IFN? can exhibit distinct functional properties, although the molecular basis of this is unclear. Here we demonstrate IFN uniquely and specifically ligates to IFNAR1 in an IFNAR2-independent manner and provide the structural basis of the IFNAR1-IFN interaction. We show that the IFNAR1-IFN complex transduces signals to modulate the expression of a set of genes independently of IFNAR2. Moreover, we show the in vivo importance of the IFNAR1-IFN signaling axis in a murine model of LPS-induced septic shock. Thus, we provide a molecular basis for understanding specific functions of IFN?. Interferon b induced gene expression in peritoneal exudate cells was measured 3hr post intra-peritoneal injection of 10,000IU/ml of interferon beta or saline into wildtype and Ifnar2-/- mice. Three independant experiments were performed for each treatment in both genotypes using different mice for each sample.

2013-07-13 | E-GEOD-48827 | biostudies-arrayexpress

Structural basis of APH(3')-IIIa-mediated resistance to N1-substituted aminoglycoside antibiotics.

Project description:Butirosin is unique among the naturally occurring aminoglycosides, having a substituted amino group at position 1 (N1) of the 2-deoxystreptamine ring with an (S)-4-amino-2-hydroxybutyrate (AHB) group. While bacterial resistance to aminoglycosides can be ascribed chiefly to drug inactivation by plasmid-encoded aminoglycoside-modifying enzymes, the presence of an AHB group protects the aminoglycoside from binding to many resistance enzymes, and hence, the antibiotic retains its bactericidal properties. Consequently, several semisynthetic N1-substituted aminoglycosides, such as amikacin, isepamicin, and netilmicin, were developed. Unfortunately, butirosin, amikacin, and isepamicin are not resistant to inactivation by 3'-aminoglycoside O-phosphotransferase type IIIa [APH(3')-IIIa]. We report here the crystal structure of APH(3')-IIIa in complex with an ATP analog, AMPPNP [adenosine 5'-(beta,gamma-imido)triphosphate], and butirosin A to 2.4-A resolution. The structure shows that butirosin A binds to the enzyme in a manner analogous to other 4,5-disubstituted aminoglycosides, and the flexible antibiotic-binding loop is key to the accommodation of structurally diverse substrates. Based on the crystal structure, we have also constructed a model of APH(3')-IIIa in complex with amikacin, a commonly used semisynthetic N1-substituted 4,6-disubstituted aminoglycoside. Together, these results suggest a strategy to further derivatize the AHB group in order to generate new aminoglycoside derivatives that can elude inactivation by resistance enzymes while maintaining their ability to bind to the ribosomal A site.

| S-EPMC2704631 | biostudies-literature

Structural basis of a novel Interferon b signaling axis mediated via the ifnar1 receptor

2013-07-13 | GSE48827 | GEO

Structural basis of ABCF-mediated resistance to pleuromutilin, lincosamide, and streptogramin A antibiotics in Gram-positive pathogens

Project description:We present evidence of mechanistically diverse allosteric relays converging on a few peptidyltransferase center (PTC) nucleotides, and propose a general model of antibiotic resistance mediated by these ARE-ABCFs

2021-04-29 | GSE162168 | GEO

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