1. Simple purification of human antimicrobial peptide dermcidin (MDCD-1L) by intein-mediated expression in E.coli
- Author
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Yong-Seok Kim, Shin-Geon Choi, and In-Pyo Hong
- Subjects
Recombinant Fusion Proteins ,Antimicrobial peptides ,Gene Expression ,Peptide ,Biology ,Protein Engineering ,Applied Microbiology and Biotechnology ,Inteins ,Micrococcus ,chemistry.chemical_compound ,Affinity chromatography ,Escherichia coli ,Humans ,Peptide sequence ,Gel electrophoresis ,chemistry.chemical_classification ,Methionine ,General Medicine ,Molecular biology ,Anti-Bacterial Agents ,Amino acid ,chemistry ,Biochemistry ,Peptides ,Intein ,Biotechnology - Abstract
Among human antimicrobial peptides (hAMPs), DCD-1L has a broad spectrum of antimicrobial activity over a wide pH range and in high salt concentrations. It offers a promising alternative to conventional antibiotics. The 458-bp-long dermcidin cDNA was amplified by PCR using a human fetal cDNA library as a template. The 147-bp fragment of the MDCD-1L gene encoding an additional methionine residue was subcloned into the pTYB11 vector. Recombinant MDCD-1L was expressed as an intein fusion protein in E. coli, and then purified by affinity chromatography using chitin beads. A small peptide with a molecular mass of about 5 kDa was detected by tricine gel electrophoresis. The recombinant MDCD-1L peptide was purified from the gel and its amino acid sequence was determined by nanoLC-ESI-MS/MS analysis. The initiating amino acid, methionine, remained attached to the N-terminal region of recombinant MDCD-1L. Purified MDCD-1L showed antimicrobial activity against a Micrococcus luteus test strain.
- Published
- 2010