title: The amino-terminal domain of human signal transducers and activators of transcription 1: overexpression, purification and characterization.
abstract: The dual functional signal transducers and activators of transcription (STAT) proteins are latent cytoplasmic transcription factors that play crucial roles in host defense. Animals that lack these proteins are highly susceptible to microbial and viral infections and chemically induced primary tumours. We have over expressed the amino-terminal domain of human STAT1 (hSTAT1) in Escherichia coli and purified it by affinity chromatography and gel filtration chromatography. The entire process has been monitored by gel electrophoresis. The pure protein has been characterized by mass spectrometry and 2-dimensional nuclear magnetic resonance (2D-NMR) spectroscopy. Our results indicate that the N-terminus of hSTAT1 exists as a dimer in solution.
authors.affiliation: Department of Pharmaceutical Chemistry, Bombay College of Pharmacy, Kalina, Mumbai 400 098, India.
authors.forename: Arati
authors.initials: A
authors.lastname: Prabhu
authors.forename: Evans
authors.initials: E
authors.lastname: Coutinho
authors.forename: Sudha
authors.initials: S
authors.lastname: Srivastava
mesh_terms: D000595:Amino Acid Sequence; D002846:Chromatography, Affinity / Q000379:methods; D002853:Chromatography, Liquid / Q000379:methods; D004591:Electrophoresis, Polyacrylamide Gel / Q000379:methods; D004926:Escherichia coli / Q000235:genetics*; D015870:Gene Expression; D005982:Glutathione Transferase / Q000235:genetics* / Q000378:metabolism; D006801:Humans; D008969:Molecular Sequence Data; D019906:Nuclear Magnetic Resonance, Biomolecular / Q000379:methods; D010957:Plasmids; D017433:Protein Structure, Secondary; D050794:STAT1 Transcription Factor / Q000096:biosynthesis* / Q000737:chemistry* / Q000235:genetics / Q000302:isolation & purification; D019032:Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization / Q000379:methods
chemical_list: D050794:STAT1 Transcription Factor; C494079:STAT1 protein, human; D005982:Glutathione Transferase