Project description:Pancreatic Tumor samples from biopsy collected at different stages along with normal tissue samples from various organ sites including commercial normals arrayed on 2channel Agilent 60mer Oligo arrays (human v1 & v2), median normalized for cross comparison. Some normal samples temporarily removed to public due to Intelectual property conflict. Keywords: Pancreatic tumor comparison to normals for multimetric study
Project description:Expression profiling of 8 normal pancreatic and 14 PDAC tissues. Data was generated from Affymetrix arrays. Results provide a global profile of over 50,000 genes in normal and tumorous tissues, and comparison of the differentially expressed genes between the normal and tumor groups.
Project description:Aberrant gene expression between HCC tumor tissues, histologically normal adjacent liver tissues and peripheral blood mononuclear cell (PBMC) samples from healthy individuals and patients with pancreatic carcinoma, gastric carcinoma and HCC were identified using Affymetrix gene arrays. A 13-member HCC-specific gene signature was identified and validated via custom-designed quantitative multiplexed gene expression analysis using the GenomeLab GeXP Genetic Analysis System (GeXP).
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.