title: Construction of Recombinant Pichia pastoris Carrying a Constitutive AvBD9 Gene and Analysis of Its Activity.
abstract: Avian beta-defensin 9 (AvBD9) is a small cationic peptide consisting of 41 amino acids that plays a crucial rule in innate immunity and acquired immunity in chickens. Owing to its wide antibacterial spectrum, lack of a residue, and failure to induce bacterial drug resistance, AvBD9 is expected to become a substitute for conventional antibiotics in the livestock and poultry industries. Using the preferred codon of Pichia pastoris, the mature AvBD9 peptide was designed and synthesized, based on the sequence from GenBank. The P. pastoris constitutive expression vector pGHKα was used to construct a pGHKα-AvBD9 recombinant plasmid. Restriction enzyme digestion was performed using SacI and BglII to remove the ampicillin resistance gene, and the plasmid was electrotransformed into P. pastoris GS115. High-expression strains with G418 resistance were screened, and the culture supernatant was analyzed by Tricine-SDS-PAGE and western blot assay to identify target bands of about 6 kDa. A concentrate of the supernatant containing AvBD9 was used for determination of antimicrobial activity. The supernatant concentrate was effective against Escherichia coli, Salmonella paratyphi, Salmonella pullorum, Pseudomonas aeruginosa, Enterococcus faecalis, and Enterobacter cloacae. The fermentation product of P. pastoris carrying the recombinant AvBD9 plasmid was adjusted to 1.0 × 10(8) CFU/ml and added to the drinking water of white feather broilers at different concentrations. The daily average weight gain and immune organ indices in broilers older than 7 days were significantly improved by the AvBD9 treatment.
authors.affiliation: College of Animal Science and Technology, Anhui Agricultural University, Hefei, Anhui 230036, P.R. China.
authors.forename: Jian
authors.initials: J
authors.lastname: Tu
authors.affiliation: College of Animal Science and Technology, Anhui Agricultural University, Hefei, Anhui 230036, P.R. China.
authors.forename: Kezong
authors.initials: K
authors.lastname: Qi
authors.affiliation: College of Animal Science and Technology, Anhui Agricultural University, Hefei, Anhui 230036, P.R. China.
authors.forename: Ting
authors.initials: T
authors.lastname: Xue
authors.affiliation: College of Animal Science and Technology, Anhui Agricultural University, Hefei, Anhui 230036, P.R. China.
authors.forename: Haiting
authors.initials: H
authors.lastname: Wei
authors.affiliation: College of Animal Science and Technology, Anhui Agricultural University, Hefei, Anhui 230036, P.R. China.
authors.forename: Yongzheng
authors.initials: Y
authors.lastname: Zhang
authors.affiliation: College of Animal Science and Technology, Anhui Agricultural University, Hefei, Anhui 230036, P.R. China.
authors.forename: Yanli
authors.initials: Y
authors.lastname: Wu
authors.affiliation: College of Animal Science and Technology, Anhui Agricultural University, Hefei, Anhui 230036, P.R. China.
authors.forename: Xiuhong
authors.initials: X
authors.lastname: Zhou
authors.affiliation: College of Animal Science and Technology, Anhui Agricultural University, Hefei, Anhui 230036, P.R. China.
authors.forename: Xiaolong
authors.initials: X
authors.lastname: Lv
mesh_terms: D000818:Animals; D000890:Anti-Infective Agents / Q000008:administration & dosage / Q000378:metabolism*; D001835:Body Weight; D002645:Chickens / Q000254:growth & development*; D004032:Diet / Q000379:methods*; D015870:Gene Expression; D006090:Gram-Negative Bacteria / Q000187:drug effects*; D008826:Microbial Sensitivity Tests; D010843:Pichia / Q000235:genetics; D011994:Recombinant Proteins / Q000235:genetics / Q000378:metabolism; D014170:Transformation, Genetic; D016896:Treatment Outcome; D023083:beta-Defensins / Q000008:administration & dosage / Q000235:genetics / Q000378:metabolism*
chemical_list: D000890:Anti-Infective Agents; D011994:Recombinant Proteins; D023083:beta-Defensins
keywords: AvBD9; Pichia pastoris; antibacterial activity; constitutive expression; white feather broiler