title: Expression and purification of exendin-4, a GLP-1 receptor agonist, in Escherichia coli.
abstract: Exendin-4 is a 39 amino acid peptide isolated from salivary secretions of Gila monster (Heloderma suspectum). It shows 53% sequence similarity to glucagon-like peptide-1 (GLP-1), which is evaluated for the regulation of plasma glucose in type 2 diabetes. Exendin-4 is a potent and long-acting agonist of GLP-1 receptor. In the present study, the exendin-4 gene obtained by PCR with an enterokinase site at N-terminus and a termination codon at C-terminus was expressed in Escherichia coli strain BL21 (DE3) harboring pET32a(+). The fusion protein was purified by chromatography on Ni-NTA-agarose column. Recombinant exendin-4 was obtained by enterokinase cleavage of the fusion protein and subsequent purification. The yield of recombinant exendin-4 was 3.15mg/10g bacteria. The obtained recombinant exendin-4 shows glucose-lowering action in vivo.
authors.affiliation: State Key Laboratory of Bioreactor Engineering, Institute of Biochemistry, East China University of Science and Technology, Shanghai 200237, PR China. xiao_pu@yahoo.com.cn
authors.forename: Xiaopu
authors.initials: X
authors.lastname: Yin
authors.forename: Dongzhi
authors.initials: D
authors.lastname: Wei
authors.forename: Lina
authors.initials: L
authors.lastname: Yi
authors.forename: Xinyi
authors.initials: X
authors.lastname: Tao
authors.forename: Yushu
authors.initials: Y
authors.lastname: Ma
mesh_terms: D000818:Animals; D001483:Base Sequence; D001786:Blood Glucose / Q000187:drug effects; D003001:Cloning, Molecular; D004926:Escherichia coli / Q000235:genetics*; D000077270:Exenatide; D005786:Gene Expression Regulation; D000067757:Glucagon-Like Peptide-1 Receptor; D005947:Glucose / Q000494:pharmacology; D008297:Male; D008969:Molecular Sequence Data; D010455:Peptides / Q000235:genetics* / Q000302:isolation & purification* / Q000494:pharmacology; D051381:Rats; D017208:Rats, Wistar; D018027:Receptors, Glucagon / Q000819:agonists*; D011993:Recombinant Fusion Proteins / Q000235:genetics / Q000302:isolation & purification / Q000494:pharmacology; D014688:Venoms / Q000235:genetics* / Q000302:isolation & purification* / Q000494:pharmacology
chemical_list: D001786:Blood Glucose; C000593835:Glp1r protein, rat; D000067757:Glucagon-Like Peptide-1 Receptor; D010455:Peptides; D018027:Receptors, Glucagon; D011993:Recombinant Fusion Proteins; D014688:Venoms; D000077270:Exenatide; D005947:Glucose