TABLE 3.

Conversion of phenolic compounds by npcB and npcA gene products in crude cell extract of E. coli

Substrate	Sp act (pmol/μg of protein/min)a	Relative activityb
4-NP	26.4 ± 2.2	100
4-NCA	25.0 ± 2.3	95
2,4,6-TNPc	<0.1
2,4,6-TCP	4.6 ± 0.7	17

^aResults are the mean of three independent experiments with standard deviations noted.

^bRelative activity was standardized by setting the activity for 4-NP as, 100.

^c2,4,6-TNP, 2,4,6-trinitrophenol.