Table 2.

Torsion angles (°) of the side-chains of His252 and Trp253

	His252		Trp253
	κ1	κ2	κ1	κ2
Type-I A subunit	177.7	74.0	−81.6	−35.4
Type-I B subunit	175.2	78.3	−78.1	−40.4
Type-II ACT	−168.3	50.5	54.9	11.8
Type-II ISB	−165.3	59.4	−131.3	14.1