Table 4.

Accessibility of NH₂OH to PSII donor side in isolated PSII complexes

PSII activity*
Sample	0 μM NH2OH	10 μM NH2OH
CP47-tagged PSII	834 ± 12	568 ± 11
	(100 ± 1.4)	(68.1 ± 1.3)
ΔpsbQ/CP47-tagged PSII	572 ± 24	301 ± 10
	(100 ± 4.1)	(52.6 ± 1.8)
PsbQ-tagged PSII	1,023 ± 12	789 ± 18
	(100 ± 1.2)	(77.1 ± 1.8)

*Oxygen evolution rates are given in units of μmol O₂ · mg Chl⁻¹ · h⁻¹ ± the standard error of the mean (n = 3), and the values in parentheses indicate the percent activity ± the standard error of the mean (n = 3) relative to that in the absence of NH₂OH for each sample.