title: Cloning, expression, and purification of the uropathogenic Escherichia coli invasin DraD.
abstract: In this study we presented a very efficient expression system, based on pET30LIC/Ek vector, for producing DraD invasin of the uropathogenic Escherichia coli and a one-step chromatography purification procedure for obtaining pure recombinant protein (DraD-C-His(6)). This protein has a molecular weight of 14,818 and calculated pI of 6.6. It contains a polyhistidine tag at the C-terminus (13 additional amino acids) that allowed single-step isolation by Ni affinity chromatography. Also, we obtained specific antibodies against DraD invasin to develop tools for characterizing the expression and biological function of this protein. The amount and quality of DraD-C-His(6) fusion protein purified from E. coli overexpression system seems to be fully appropriate for crystallographic studies (soluble form), and for establishing role of the protein in bacterium (cultured cell line interaction and in the internalization process) and for obtaining rabbit polyclonal antisera (insoluble form).
authors.affiliation: Department of Microbiology, Technical University of Gdansk, ul. Narutowicza 11/12, Gdansk, 80-952, Poland.
authors.forename: B
authors.initials: B
authors.lastname: Zalewska
authors.forename: R
authors.initials: R
authors.lastname: Piatek
authors.forename: H
authors.initials: H
authors.lastname: Cieślinski
authors.forename: B
authors.initials: B
authors.lastname: Nowicki
authors.forename: J
authors.initials: J
authors.lastname: Kur
mesh_terms: D018829:Adhesins, Bacterial; D000595:Amino Acid Sequence; D000818:Animals; D001426:Bacterial Proteins / Q000737:chemistry / Q000235:genetics* / Q000302:isolation & purification* / Q000378:metabolism; D001483:Base Sequence; D003001:Cloning, Molecular; D004926:Escherichia coli / Q000472:pathogenicity; D029968:Escherichia coli Proteins / Q000737:chemistry / Q000235:genetics* / Q000302:isolation & purification* / Q000378:metabolism; D015870:Gene Expression; D005822:Genetic Vectors; D006639:Histidine / Q000737:chemistry; D007526:Isoelectric Point; D008969:Molecular Sequence Data; D008970:Molecular Weight; D017434:Protein Structure, Tertiary; D011817:Rabbits; D011993:Recombinant Fusion Proteins / Q000737:chemistry / Q000302:isolation & purification / Q000378:metabolism; D012995:Solubility; D014169:Transformation, Bacterial; D014552:Urinary Tract Infections / Q000382:microbiology
chemical_list: D018829:Adhesins, Bacterial; D001426:Bacterial Proteins; D029968:Escherichia coli Proteins; D011993:Recombinant Fusion Proteins; C053476:invasin, Yersinia; D006639:Histidine