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Title: Preparation of biologically active recombinant human progastrin(1-80).
Austin Authors: McQueen, Kim;Kovac, Suzana;Ho, Po-Ki;Rorison, Kristy;Pannequin, Julie;Neumann, Greg;Shulkes, Arthur;Baldwin, Graham S
Affiliation: University of Melbourne Department of Surgery, Austin and Repatriation Medical Centre, Melbourne, Victoria, Australia
Issue Date: 1-Oct-2002
Publication information: Journal of Protein Chemistry; 21(7): 465-71
Abstract: The bacterial expression of human progastrin(6-80) has been reported previously [Baldwin, G.S. et al. (2001) J. Biol. Chem. 276: 7791-7796]. The aims of the present study were to prepare full-length recombinant human progastrin(1-80) and to compare its biological activity with that of progastrin(6-80) in vitro, to determine whether or not the N-terminal five amino acids contributed to activity. A fusion protein of glutathione-S-transferase and human progastrin(1-80) was expressed in Escherichia coli, collected on glutathione-agarose beads, and cleaved with enterokinase. Progastrin(1-80) was purified by reversed-phase and anion exchange HPLC and characterized by radioimmunoassay, amino acid sequencing, and mass spectrometry. No differences were detected in the extent of stimulation by progastrin(1-80) and progastrin(6-80) in proliferation and migration assays with the mouse gastric cell line IMGE-5. We conclude that residues 1-5 of progastrin(1-80) are not essential for biological activity.
Gov't Doc #: 12523650
Journal: Journal of protein chemistry
Type: Journal Article
Subjects: Amino Acid Sequence
Amino Acids.analysis
Cell Division.drug effects
Cell Line, Transformed
Cell Movement.drug effects
Chromatography, High Pressure Liquid.methods
Escherichia coli.genetics.metabolism
Gastric Mucosa.cytology
Glutathione Transferase.genetics
Mice, Transgenic
Molecular Sequence Data
Protein Precursors.biosynthesis.genetics.pharmacology
Recombinant Fusion Proteins.biosynthesis.genetics.pharmacology
Spectrometry, Mass, Electrospray Ionization
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