TABLE 2.

Lysine decarboxylase activities of the wild type and cadA mutant JR203 in LBS (pH 7.5) and LBS (pH 5.0) after growth transition

Strain	pHa	Lysine decarboxylase activity (units A600−1) atb:
		1	2	4	6
WTd	7.5	0.0	2.6	1.2	0.4
WT	5.0	22.0	55.2	26.2	21.6
WTc	5.0	35.2	123.0	51.8	44.2
JR203	7.5	0.0	0.1	0.0	0.0
JR203	5.0	0.0	1.8	0.2	0.2
JR203	5.0	0.0	1.7	0.2	0.2

^aMedium pH after transition.

^b1, 2, 4, and 6 denote the time points (h) following the transition.

^cLysine (15 mM) was added to the medium right after the transition.

^dWT, wild type.