Dissection and modulation of the four distinct activities of nisin by mutagenesis of rings A and B and by C-terminal truncation.
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.
BiOMaDe Technology Foundation, Nijenborgh 4, 9747 AG Groningen, The Netherlands.
Rick
R
Rink
Jenny
J
Wierenga
Anneke
A
Kuipers
Leon D
LD
Kluskens
Arnold J M
AJ
Driessen
Oscar P
OP
Kuipers
Gert N
GN
Moll
D000900:Anti-Bacterial Agents / Q000096:biosynthesis* / Q000737:chemistry*; D001419:Bacteria / Q000187:drug effects / Q000254:growth & development; D001426:Bacterial Proteins; D016296:Mutagenesis; D016297:Mutagenesis, Site-Directed; D009561:Nisin / Q000096:biosynthesis / Q000737:chemistry / Q000235:genetics* / Q000494:pharmacology; D011487:Protein Conformation; D015202:Protein Engineering / Q000379:methods; D011994:Recombinant Proteins / Q000737:chemistry / Q000494:pharmacology; D013329:Structure-Activity Relationship
D000900:Anti-Bacterial Agents; D001426:Bacterial Proteins; D011994:Recombinant Proteins; D009561:Nisin