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Homo sapiens

ABSTRACT: Genome-wide maps of histone H3K27 acetylation in A549 and MSR-A549 cells.

PROVIDER: PRJNA379622 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR5356310.fastq.gz	Fastqsanger.gz
	SRR5356311.fastq.gz	Fastqsanger.gz
	SRR5356312.fastq.gz	Fastqsanger.gz
	SRR5356313.fastq.gz	Fastqsanger.gz
	SRR5356314.fastq.gz	Fastqsanger.gz

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Genome-wide maps of histone H3K27 acetylation in A549 and MSR-A549 cells.

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mRNA expression profile of A549 cells and MSR-A549 cells with or without JQ1 treatment

Project description:To establish effective multitargeted KRAS pathway therapy, we analyzed mediators of acquired resistance to chronic momelotinib and MEK inhibitor exposure in A549 cells. Since inhibitor resistance was completely reversible after drug withdrawal for several passages, suggesting epigenetic reprogramming, we investigated whole mRNA expression profiles in A549, momelotinib and selumetinib resistant (MSR)-A549 cells and MSR-A549 cells following drug withdrawal for 10 days. In parallel, we also examined mRNA expression profiles of MSR-A549 cells treated with the BET inhibitor JQ1, to identify specific targets regulated by H3K27 acetylation.

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Crystal structure of Homo sapiens kynureninase.

Project description:Kynureninase is a member of a large family of catalytically diverse but structurally homologous pyridoxal 5'-phosphate (PLP) dependent enzymes known as the aspartate aminotransferase superfamily or alpha-family. The Homo sapiens and other eukaryotic constitutive kynureninases preferentially catalyze the hydrolytic cleavage of 3-hydroxy-l-kynurenine to produce 3-hydroxyanthranilate and l-alanine, while l-kynurenine is the substrate of many prokaryotic inducible kynureninases. The human enzyme was cloned with an N-terminal hexahistidine tag, expressed, and purified from a bacterial expression system using Ni metal ion affinity chromatography. Kinetic characterization of the recombinant enzyme reveals classic Michaelis-Menten behavior, with a Km of 28.3 +/- 1.9 microM and a specific activity of 1.75 micromol min-1 mg-1 for 3-hydroxy-dl-kynurenine. Crystals of recombinant kynureninase that diffracted to 2.0 A were obtained, and the atomic structure of the PLP-bound holoenzyme was determined by molecular replacement using the Pseudomonas fluorescens kynureninase structure (PDB entry 1qz9) as the phasing model. A structural superposition with the P. fluorescens kynureninase revealed that these two structures resemble the "open" and "closed" conformations of aspartate aminotransferase. The comparison illustrates the dynamic nature of these proteins' small domains and reveals a role for Arg-434 similar to its role in other AAT alpha-family members. Docking of 3-hydroxy-l-kynurenine into the human kynureninase active site suggests that Asn-333 and His-102 are involved in substrate binding and molecular discrimination between inducible and constitutive kynureninase substrates.

| S-EPMC2531291 | biostudies-literature

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