A phage display selected 7-mer peptide inhibitor of the Tannerella forsythia metalloprotease-like enzyme Karilysin can be truncated to Ser-Trp-Phe-Pro

• Published in: PloS one 2012-10, Vol.7 (10), p.e48537-e48537
• Main Authors: Skottrup, Peter Durand, Sørensen, Grete, Ksiazek, Miroslaw, Potempa, Jan, Riise, Erik
• Format: Article
• Language: English
• Subjects: Amino Acid Motifs; Amino Acid Sequence; Bacteria; Bacterial Proteins - antagonists & inhibitors; Bacterial Proteins - chemistry; Bacterial Proteins - metabolism; Bacteroides; Bacteroidetes - enzymology; Binders; Biochemistry; Biology; Biophysics; Catalysis; Catalytic Domain; Cloning; Conserved sequence; E coli; Enzymatic activity; Enzyme Inhibitors - chemistry; Enzyme Inhibitors - pharmacology; Enzymes; Fusion protein; Gram-negative bacteria; Gum disease; Immune response; Immune system; Inhibition; Inhibitors; Kinesis; Maltose; Maltose-binding protein; Matrix Metalloproteinases - chemistry; Matrix Metalloproteinases - metabolism; Medicine; Metalloproteinase; Models, Molecular; N-Terminus; Peptide Library; Peptides; Peptides - chemistry; Peptides - pharmacology; Periodontal disease; Periodontics; Phage display; Phages; Pharmacology; Porphyromonas gingivalis; Protein Binding; Protein Conformation; Proteins; Proteolysis - drug effects; Recombinant Fusion Proteins - antagonists & inhibitors; Recombinant Fusion Proteins - chemistry; Recombinant Fusion Proteins - metabolism; Rheumatoid arthritis; Serine; Solubility; Structure-function relationships; Systemic diseases
• ISSN: 1932-6203; 1932-6203
• DOI: 10.1371/journal.pone.0048537

Tannerella forsythia is a gram-negative bacteria, which is strongly associated with the development of periodontal disease. Karilysin is a newly identified metalloprotease-like enzyme, that is secreted from T. forsythia. Karilysin modulates the host immune response and is therefore considered a likely drug target. In this study peptides were selected towards the catalytic domain from Karilysin (Kly18) by phage display. The peptides were linear with low micromolar binding affinities. The two best binders (peptide14 and peptide15), shared the consensus sequence XWFPXXXGGG. A peptide15 fusion with Maltose Binding protein (MBP) was produced with peptide15 fused to the N-terminus of MBP. The peptide15-MBP was expressed in E. coli and the purified fusion-protein was used to verify Kly18 specific binding. Chemically synthesised peptide15 (SWFPLRSGGG) could inhibit the enzymatic activity of both Kly18 and intact Karilysin (Kly48). Furthermore, peptide15 could slow down the autoprocessing of intact Kly48 to Kly18. The WFP motif was important for inhibition and a truncation study further demonstrated that the N-terminal serine was also essential for Kly18 inhibition. The SWFP peptide had a Ki value in the low micromolar range, which was similar to the intact peptide15. In conclusion SWFP is the first reported inhibitor of Karilysin and can be used as a valuable tool in structure-function studies of Karilysin.