TY  - JOUR
  - Suda, S,Lawton, EM,Wistuba, D,Cotter, PD,Hill, C,Ross, RP
  - 2012
  - January
  - Journal of Bacteriology
  - Homologues and Bioengineered Derivatives of LtnJ Vary in Ability to Form D-Alanine in the Lantibiotic Lacticin 3147
  - Validated
  - ()
  - D-AMINO-ACID LACTOCOCCUS-LACTIS SKIN SECRETIONS PEPTIDE CONVERSION BIOSYNTHESIS MUTAGENESIS SERINE ENZYME NISIN
  - 194
  - 708
  - 714
  - Ltn alpha and Ltn beta are individual components of the two-peptide lantibiotic lacticin 3147 and are unusual in that, although ribosomally synthesized, they contain D-amino acids. These result from the dehydration of L-serine to dehydroalanine by LtnM and subsequent stereospecific hydrogenation to D-alanine by LtnJ. Homologues of LtnJ are rare but have been identified in silico in Staphylococcus aureus C55 (SacJ), Pediococcus pentosaceus FBB61 (PenN), and Nostoc punctiforme PCC73102 (NpnJ, previously called NpunJ [P.D. Cotter et al., Proc. Natl. Acad. Sci. U.S.A. 102: 18584-18589, 2005]). Here, the ability of these enzymes to catalyze D-alanine formation in the lacticin 3147 system was assessed through heterologous enzyme production in a Delta ltnJ mutant. PenN successfully incorporated D-alanines in both peptides, and SacJ modified Ltnj alpha only, while NpnJ was unable to modify either peptide. Site-directed mutagenesis was also employed to identify residues of key importance in LtnJ. The most surprising outcome from these investigations was the generation of peptides by specific LtnJ mutants which exhibited less bioactivity than those generated by the Delta ltnJ strain. We have established that the reduced activity of these peptides is due to the inability of the associated LtnJ enzymes to generate D-alanine residues in a stereospecific manner, resulting in the presence of both D-and L-alanines at the relevant locations in the lacticin 3147 peptides.
  - DOI 10.1128/JB.06185-11
DA  - 2012/01
ER  - 

@article{V160747722,
   = {Suda,  S and Lawton,  EM and Wistuba,  D and Cotter,  PD and Hill,  C and Ross,  RP },
   = {2012},
   = {January},
   = {Journal of Bacteriology},
   = {Homologues and Bioengineered Derivatives of LtnJ Vary in Ability to Form D-Alanine in the Lantibiotic Lacticin 3147},
   = {Validated},
   = {()},
   = {D-AMINO-ACID LACTOCOCCUS-LACTIS SKIN SECRETIONS PEPTIDE CONVERSION BIOSYNTHESIS MUTAGENESIS SERINE ENZYME NISIN},
   = {194},
  pages = {708--714},
   = {{Ltn alpha and Ltn beta are individual components of the two-peptide lantibiotic lacticin 3147 and are unusual in that, although ribosomally synthesized, they contain D-amino acids. These result from the dehydration of L-serine to dehydroalanine by LtnM and subsequent stereospecific hydrogenation to D-alanine by LtnJ. Homologues of LtnJ are rare but have been identified in silico in Staphylococcus aureus C55 (SacJ), Pediococcus pentosaceus FBB61 (PenN), and Nostoc punctiforme PCC73102 (NpnJ, previously called NpunJ [P.D. Cotter et al., Proc. Natl. Acad. Sci. U.S.A. 102: 18584-18589, 2005]). Here, the ability of these enzymes to catalyze D-alanine formation in the lacticin 3147 system was assessed through heterologous enzyme production in a Delta ltnJ mutant. PenN successfully incorporated D-alanines in both peptides, and SacJ modified Ltnj alpha only, while NpnJ was unable to modify either peptide. Site-directed mutagenesis was also employed to identify residues of key importance in LtnJ. The most surprising outcome from these investigations was the generation of peptides by specific LtnJ mutants which exhibited less bioactivity than those generated by the Delta ltnJ strain. We have established that the reduced activity of these peptides is due to the inability of the associated LtnJ enzymes to generate D-alanine residues in a stereospecific manner, resulting in the presence of both D-and L-alanines at the relevant locations in the lacticin 3147 peptides.}},
   = {DOI 10.1128/JB.06185-11},
  source = {IRIS}
}