A tiny snippet in Nursing Times mentioned research done at St. Andrews, which looked at inhibiting MRSA with a combination of the antibiotic lysostaphin and ranalexin, a peptide found in bullfrogs.
This is, I am sure, a paper in the Journal of Antimicrobial Chemotherapy:
Graham S, Coote PJ.
Potent, synergistic inhibition of Staphylococcus aureus upon exposure to a combination of the endopeptidase lysostaphin and the cationic peptide ranalexin.J Antimicrob Chemother. 2007 Apr;59(4):759-62. Epub 2007 Feb 26.
The PubMed record is here - and the full text link should work for University of Leicester members (you may need to login with Athens off campus).