Ghosh A,Â Kar RK,Â Jana J,Â Saha A,Â Jana B,Â Krishnamoorthy J,Â Kumar D,Â Ghosh S,Â Chatterjee S,Â Bhunia A, Â ChemMedChem, 2014, 9, 2052-8.
Indolicidin (IR13), a 13-residue antimicrobial peptideÂ from the cathelicidin family, is known to exhibit a broad spectrum of antimicrobial activity against various microorganisms. ThisÂ peptideÂ inhibits bacterial DNA synthesis resulting in cell filamentation. However, the precise mechanism remains unclear and requires further investigation. The central PWWP motif of IR13 provides a unique structural element that can wrap around, and thus stabilize, duplex B-type DNA structures. Replacements of the central Trp-Trp pair with Ala-Ala, His-His, or Phe-Phe residues in the PxxP motif significantly affects the ability of theÂ peptideÂ to stabilize duplex DNA. Results of microscopy studies in conjunction with spectroscopic data confirm that the DNA duplex is stabilized by IR13, thereby inhibiting DNA replication and transcription. In this study we provide high-resolution structural information on the interaction between indolicidin and DNA, which will be beneficial for the design of novel therapeutic antibiotics based onÂ peptide scaffolds.