Table 2.

Parameters for relaxation of Trp synthase serine complexes⁹

	Positive P-jump						Negative P-jump
Cation ligand	ko,s−1	ΔVo‡ mL/mol−1	βo‡ mL/MPa−1	kc, s−1	ΔVc‡ mL/mol−1	βo‡ mL/MPa−1	ko,s−1	ΔVo‡ mL/mol−1	βo‡ mL/MPa−1	kc,s−1	ΔVc‡ mL/mol−1	βo‡ mL/βoMPa−1
Na+	1.09	−12	0.397	17.3	125	0.397	0.34	−48	0.230	5.45	89	0.229
NH4+	0.014	−127	−0.588	47.5	36	−0.630	0.0043	−153	−0.736	14.4	8	−0.736
Na+	0 (1.8 × 10−6)	−279	−1.46	0.139	−89	−1.46	0 (2.0 × 10−8)	−235	−1.32	0.0015	−46	−1.32
BZIa
	0 (3.9 × 10−8)	−349	−1.84	0.003	−160	−1.84	0 (3.2 × 10−7)	−285	−1.59	0.0247	−96	−1.59

^aValues in parentheses are calculated on the basis of k_c and K_eq from Table 1.