title: [Cloning, expression, purification and activity assay of Trypanosoma brucei phenylalanyl-tRNA synthetase in Escherichia coli].
abstract: Phenylalany--tRNA synthetase is a key enzyme for protein synthesis in Trypanosoma. Its validation as an inhibition. target will enable the development of a new generation of anti-Trypanosoma drugs. However, little is known about the isolation of the Trypanosoma Phenylalanyl-tRNA synthetase. Here we report the cloning, expression, purification, and activity assay of Phenylalanyl-tRNA synthetase from Trypanosoma brucei in Escherichia coli host. We co-cloned the alpha-subunit and beta-subunit of Phenylalanyl-tRNA synthetase from Trypanosoma brucei genomic DNA into the co-expression vector pCOLADuet. We successfully expressed the Trypanosoma brucei Phenylalanyl-tRNA synthetase in E. coli host, purified the whole enzyme by Ni-Hind affinity column and verified it by Western blotting. In addition, we tested its enzymatic activity by isotope labeling. The whole work laid a solid foundation for in vitro the screening and optimization of Trypanosoma brucei phenylalanyl-tRNA synthetase inhibitors.
authors.affiliation: School of Pharmacy, Shanghai Jiaotong University, Shanghai 200240, China.
authors.forename: Ying
authors.initials: Y
authors.lastname: Yao
authors.forename: Guangwei
authors.initials: G
authors.lastname: Gao
authors.forename: Dawei
authors.initials: D
authors.lastname: Li
mesh_terms: D003001:Cloning, Molecular; D004926:Escherichia coli / Q000235:genetics / Q000378:metabolism; D005822:Genetic Vectors / Q000235:genetics; D010652:Phenylalanine-tRNA Ligase / Q000096:biosynthesis* / Q000235:genetics; D015800:Protozoan Proteins / Q000096:biosynthesis* / Q000235:genetics; D011994:Recombinant Proteins / Q000096:biosynthesis / Q000235:genetics / Q000378:metabolism*; D014346:Trypanosoma brucei brucei / Q000201:enzymology* / Q000235:genetics
chemical_list: D015800:Protozoan Proteins; D011994:Recombinant Proteins; D010652:Phenylalanine-tRNA Ligase