New and Improved Antimicrobial Peptides!

A team of scientists out of MIT, the University of Brasilia, and the University of British Colombia have engineered a naturally occurring antimicrobial peptide called clavanin-A to increase its effectiveness. They added five hydrophobic amino acids to the N-terminus of the original sequence. Adding the hydrophobic residues will improve its interaction with the cell and its ability to permeate the cell membrane. In its new form, clavanin-MO has the ability to kill E. coli and S. aureus. It has also been found to stifle the inflammatory response that causes sepsis and also has the ability to destroy certain biofilms.2

Another antimicrobial peptide, lugdunin, which we highlight in a recent product spotlight, has been identified from human nasal secretions. Lugdunin is a macrocyclic thiazolidine peptide produced by the bacterium, S. lugdunensis. Lugdunin has been found to kill methicillin-resistant S. aureus (MRSA) and vancomycin-resistant Enterococcus. The researchers hope it can be used as a preventative medicine as well as an antibiotic. 1


  1. A. Nowogrodski, Nature News, (2016, July 27) Retrieved from
  2. J. Raphael, Nature World News, (2016, Nov 3). Retrieved from Full article retrieved from



Industry News

Denise Karounos

See all articles from Denise Karounos

Denise Karounos joined Peptides International in October 2016. After completing her BS in chemistry from West Virginia University, she spent time as an organic chemist at Bachem Bioscience synthesizing peptides and amino acid derivatives. Denise has experience with both solid and solution-phase peptide synthesis, and has worked under both research and cGMP settings. After completing her MBA from Saint Joseph’s University, Denise transitioned into product management of peptides and amino acid derivatives. In her marketing role, she had many duties including but not limited to product management, market research, creating and producing marketing materials, handling US catalog distribution and customer database, email marketing, quoting and inside sales, sales calls, and coordinating and attending trade conferences. 

At PI, Denise's duties encompass both sales and marketing, bringing to bear her extensive lab and sales support experience. Contact her today and see how Denise can assist you with your peptide research project.