Abstract
This work is aimed at investigating the effects of recombinant bovine lactoferrampin–lactoferricin (LFA-LFC) instead of chlortetracycline on intestinal microflora in weaned piglets. The high cost of peptide production from either native digestion or chemical synthesis limits the clinical application of antimicrobial peptides. The expression of recombinant peptides in yeast may be an effective alternative. In the current study, recombinant LFA-LFC was produced via fed-batch fermentation in recombinant strain Pichia pastoris (KM71) XS10. Uniform design U6(64) was used to optimize the fermentation conditions. The target peptide purified via cation-exchange and size-exclusion chromatography was added into the dietary of weaned piglets. After 21 days, the Lactobacilli, Bifidobacteria, and Enterobacteria in the chyme of the gut were quantified using real-time polymerase chain reaction. The results showed that approximately 82 mg of LFA-LFC was secreted into 1 L of medium under optimized conditions. Moreover, purified peptide showed strong antimicrobial activities against all the tested microorganisms. Compared with the control group, the LFA-LFC group increased the amount of Lactobacilli and Bifidobacteria (P < 0.05) in the chyme of the stomach, duodenum, jejunum, ileum, colon, and caecum. These results show that dietary supplementation with LFA-LFC can affect intestinal microflora in weaned piglets.
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Acknowledgments
This work was jointly supported by the National Basic Research Program of China (2009CB118800), National Scientific and technology Key Project (2011BAD26B002-5), Knowledge Innovation Program of the Chinese Academy of Sciences (XMXX281177, KSCX2-EW-B-10, KSCX2-EW-G-16, and KZCX2-EW-QN411), and NSFC Project (30901041, 31072042, 31001016, 31101729, and 31101730).
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Tang, XS., Shao, H., Li, TJ. et al. Dietary Supplementation with Bovine Lactoferrampin–Lactoferricin Produced by Pichia pastoris Fed-batch Fermentation Affects Intestinal Microflora in Weaned Piglets. Appl Biochem Biotechnol 168, 887–898 (2012). https://doi.org/10.1007/s12010-012-9827-0
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DOI: https://doi.org/10.1007/s12010-012-9827-0