Homo sapiens
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ABSTRACT:
PROVIDER: PRJNA87683 | ENA |
REPOSITORIES: ENA
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Project description:HeLa cells were serum starved and either preincubated with DMSO (vehicle), preincubated with U0126 (10µM in DMSO) and infected with CVB3 (MOI 10), or preincubated with DMSO (vehicle) and infected with CVB3. Following infection, virus was removed and fresh media containing 10% fetal bovine serum was added for the remainder of the infectious process. At 0, 30 minutes, 3 and 9 hours following CVB3 infection (N=3 plates per time point), RNA was isolated, processed and hybridized to GeneChip®s (N=3 per sample) Keywords: time-course
2003-10-07 | GSE697 | GEO
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2003-10-09 | GSE712 | GEO
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2007-09-28 | E-GEOD-697 | biostudies-arrayexpress
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Project description:Brucella melitensis-infected HeLa cells gene expression
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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