TABLE 4.

Phenylethylamine- and 3-nitrotyramine-dependent O₂ uptake^a

Growth substrate	O2 uptake (nmol min−1 mg protein−1)b
	MG1655		MG1655 ΔnsrR
	Phenylethyl- amine	3-Nitroty- ramine	Phenylethyl- amine	3-Nitroty- ramine
Phenylethylamine	66 (5)	41 (3)	73 (11)	44 (7)
Glycerol	ND	ND	ND	3 (1)
3-Nitrotyramine	6 (3)	4 (2)	7 (2)	4 (1)

^aPhenylethylamine- and 3-nitrotyramine-dependent O₂ uptake in extracts of cells grown on phenylethylamine or glycerol (as the carbon source) or on 3-nitrotyramine (as the nitrogen source). Cultures were grown at 30°C in defined medium containing 5 mM phenylethylamine or 40 mM glycerol as the carbon source or containing 11.1 mM glucose as the carbon source with 2.56 mM nitrotyramine as the nitrogen source.

^bNumbers in parentheses are 1 standard deviation (SD). ND, not detectable (<2 nmol min⁻¹ mg protein⁻¹).