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Applied and Environmental Microbiology, September 2007, p. 5809-5816, Vol. 73, No. 18
0099-2240/07/$08.00+0     doi:10.1128/AEM.01104-07
Copyright © 2007, American Society for Microbiology. All Rights Reserved.

Dissection and Modulation of the Four Distinct Activities of Nisin by Mutagenesis of Rings A and B and by C-Terminal Truncation{triangledown} ,{dagger}

Rick Rink,1 Jenny Wierenga,1 Anneke Kuipers,1 Leon D. Kluskens,1 Arnold J. M. Driessen,2 Oscar P. Kuipers,3 and Gert N. Moll1*

BiOMaDe Technology Foundation, Groningen, The Netherlands,1 Department of Microbiology,2 Department of Molecular Genetics, Groningen Biomolecular Sciences and Biotechnology Institute, University of Groningen, Groningen, The Netherlands3

Received 17 May 2007/ Accepted 21 July 2007

Nisin A is a pentacyclic antibiotic peptide produced by various Lactococcus lactis strains. Nisin displays four different activities: (i) it autoinduces its own synthesis; (ii) it inhibits the growth of target bacteria by membrane pore formation; (iii) it inhibits bacterial growth by interfering with cell wall synthesis; and, in addition, (iv) it inhibits the outgrowth of spores. Here we investigate the structural requirements and relevance of the N-terminal thioether rings of nisin by randomization of the ring A and B positions. The data demonstrate that: (i) mutation of ring A results in variants with enhanced activity and a modulated spectrum of target cells; (ii) for the cell growth-inhibiting activity of nisin, ring A is rather promiscuous with respect to its amino acid composition, whereas the bulky amino acid residues in ring B abolish antimicrobial activity; (iii) C-terminally truncated nisin A mutants lacking rings D and E retain significant antimicrobial activity but are unable to permeabilize the target membrane; (iv) the dehydroalanine in ring A is not essential for the inhibition of the outgrowth of Bacillus cells; (v) some ring A mutants have significant antimicrobial activities but have decreased autoinducing activities; (vi) the opening of ring B eliminates antimicrobial activity while retaining autoinducing activity; and (vii) some ring A mutants escape the nisin immune system(s) and are toxic to the nisin-producing strain NZ9700. These data demonstrate that the various activities of nisin can be engineered independently and provide a basis for the design and synthesis of tailor-made analogs with desired activities.


* Corresponding author. Mailing address: BiOMaDe Technology Foundation, Nijenborgh 4, 9747 AG Groningen, The Netherlands. Phone: 31 50 363 80 70. Fax: 31 50 363 44 29. E-mail: Moll{at}biomade.nl

{triangledown} Published ahead of print on 27 July 2007.

{dagger} Supplemental material for this article may be found at http://aem.asm.org/.


Applied and Environmental Microbiology, September 2007, p. 5809-5816, Vol. 73, No. 18
0099-2240/07/$08.00+0     doi:10.1128/AEM.01104-07
Copyright © 2007, American Society for Microbiology. All Rights Reserved.




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