TABLE 2.

Specific activities of pectin-depolymerizing enzymes during growth on glucose, polygalacturonate (DE, 0%), and pectin (DE, 90%)^a

Carbon source	Sp act (mU/mg)
	PEL		PAL		PG
	Intracellular	Extracellular	Intracellular	Extracellular	Intracellular	Extracellular
Glucose	NDb	ND	ND	ND	ND	ND
Polygalacturonate	160 ± 4.0	846 ± 31	167 ± 3.8	615 ± 19	0.44 ± 0.02	4.48 ± 0.12
Pectin	181 ± 4.5	673 ± 25	126 ± 3.0	673 ± 22	0.33 ± 0.01	3.45 ± 0.11

^aCells were grown on MI medium containing a C source at a concentration of 1% and were disrupted as described in Materials and Methods. Intracellular and extracellular fractions were prepared as described in Materials and Methods. 

^bND, not detected.