Table I. Percentage of photoaffinity labelling by 8-azido-[α-³²P]ATP remaining after displacement with unlabelled ATP or ADP.

	NBD1 (%)		NBD2 (%)
	ATP	ADP	ATP	ADP
SUR1	12 ± 10	21 ± 14	52 ± 11	45 ± 11
SUR1-S830R	8 ± 3.7	25 ± 9.0	43 ± 11	33 ± 6.8
SUR1-S1482R	9 ± 5.1	21 ± 11	39 ± 14	34 ± 8.4

Values are expressed as a percentage of 8-azido-[α-³²P]ATP bound in the absence of unlabelled ATP (100 µM) or ADP (100 µM). Experiments were performed in the presence of 1 mM Mg²⁺, as described in Materials and methods.