TABLE 3.

Expression of malK-lacZ in BRE1219 with plasmids encoding MalT fragments^a

Plasmid	Size of MalT′ (aa)	β-Galactosidase activity (U mg−1)
Vector		0.32
pACS20	325	0.31
pACS21	250	0.32
pACS22	200	0.25
pACS23	150	0.23
pACS24	100	0.27

^aThe activity of the isogenic malk′ mutant strain BRE1162 is 4.88 U mg⁻¹.