Microbial Cell Factories

Table 3 Acidifying capacities of S. thermophilus in milk

From: The fast milk acidifying phenotype of Streptococcus thermophilus can be acquired by natural transformation of the genomic island encoding the cell-envelope proteinase PrtS

Strains	UHT milk		Reconstituted milk
	Vmax	pH 5.2	Vmax	pH 5.2
	(pH U x 10 ^-4 /min)	(min)	(pH Ux 10 ^-4 /min)	(min)
DGCC7666	48	656	52	475
PrtS⁺ CL1	125	291	143	169
PrtS⁺ CL2	114	295	142	172
PrtS⁺ CL3	109	276	141	169
PrtS⁺ CL4	116	290	150	181
PrtS⁺ CL6	132	266	143	174
LMG18311	51	713	81	605
PrtS⁺ CL3A	122	284	159	164
PrtS⁺ CL6A	106	276	148	164
PrtS⁺ CL9A	125	277	156	159
PrtS⁺ CL10A	111	285	143	173
PrtS⁺ CL17A	102	379	155	167
PrtS⁺ CL21A	126	261	157	161
PrtS⁺ CL23A	128	296	158	168
DGCC7666	71	460	107	281
PrtS⁺ CLB1	166	181	153	178
DGCC7710	99	386	138	231
PrtS^-	33	948	29	1110
SrtA^-	115	361	143	213

Kinetics parameters: Vmax, maximum acidification rate in pH units x 10^-4 per minute and pH 5.2, time to reach pH 5.2 in minutes

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ISSN: 1475-2859

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