Table 2. pK_a for Asp234 in GtACR1 and Asp212 in BR.

	GtACR1			BR
pKa	Asp234	−4.9		Asp212	−2.0*
Contribution
	Schiff base	−9.7		Schiff base	−8.7*
	Arg94	−3.3		Arg82	−6.3*
	Tyr72	−3.3		Tyr57	−3.4*
	Tyr207	−3.4		Tyr185	−3.3*
	Ser97	0.5		Asp85	6.0*

^*See Saito et al., 2012.