. 2002 Feb;68(2):756–764. doi: 10.1128/AEM.68.2.756-764.2002

TABLE 1.

L. monocytogenes wild-type strains and derived spontaneous bacteriocin-resistant mutants

L. monocytogenes strain	Origin or reference	Bacteriocin phenotype^a
11	Human	Ped^r Nis^s
22	Human	Pedⁱ Nis^s
31	Human	Ped^s Nisⁱ
31P	This work	Ped^r mutant of 31^d
31N2	This work	Nis^r mutant of 31^b
33	Human	Pedⁱ Nis^s
59	Cattle	Pedⁱ Nis^s
114	Cattle	Ped^r Nis^s
124	Swine	Pedⁱ Nis^s
128	Swine	Pedⁱ Nis^s
201	Swine	Ped^s Nis^s
272	Swine	Ped^s Nis^s
272P	This work	Ped^r mutant of 272^d
288	Wastewater	Pedⁱ Nis^s
290	Sewage water	Pedⁱ Nis^s
317	Swine	Ped^r Nis^s
319	Swine	Ped^r Nis^s
322	Swine	Ped^r Nis^s
322N2	Gravesen et al. (15)	Nis^r mutant of 322^b
340	Swine	Pedⁱ Nis^s
358	Swine	Pedⁱ Nisⁱ
358N	Gravesen et al. (15)	Nis^r mutant of 358^c
386	Heat-treated pork	Ped^s Nis^s
387	Heat-treated pork	Ped^s Nisⁱ
393	Heat-treated pork	Ped^s Nisⁱ
412	Raw, salted pork	Ped^s Nis^s
412P	Gravesen et al. (16)	Ped^r mutant of 412^f
412N	Gravesen et al. (15)	Nis^r mutant of 412^e
412NP	Gravesen et al. (16)	Ped^r mutant of 412N^f
Scott A	Clinical	Ped^s Nis^s
ScottA-Ln	This work	Ped^r mutant of Scott A^g
VDL144	Reference strain	Ped^s Nis^s
GR9	This work	Ped^r mutant of VDL144^g
GR10	This work	Ped^r mutant of VDL144^g

Ped, pediocin; Nis, nisin. The superscripts “s,” “r,” and “i” indicate sensitive, resistant, and intermediate, respectively. The remaining superscript letters indicate the following. Spontaneous resistant mutants were isolated after 10 (“b”) or 27 (“c”) sequential passages on nisin-containing TSA or after 8 (“d”) passages on pediocin-containing TSA (pH 7.3, 30°C). Other mutants were isolated after a single exposure to 500 IU of nisin/ml (“e”) or 2,560 AU of pediocin/ml (“f”) (pH 6.5, 30°C) or from an agar diffusion assay, with Leuconostoc carnosum 4010 as an inhibitor, as single colonies in the inhibition zone in BHI soft agar (“g”).