Table I.

Relative rate constants for phosphoryl transfer from the phosphoenzyme intermediate of β-PGM to acceptors ROH (Scheme 1)^a

ROH	Activator	(kcat)rel
HOH	None	1b
HOH	HPO32−	580
c	None	7 × 104
c	HPO32−	2 × 109
d	None	3 × 1010

^aThese data are abstracted from Table I of Jencks (1975), and were later reported in Ray and Long (1976).

^bThe value of (k_cat)_rel = 3.2 × 10⁻⁸ s⁻¹ was determined for phosphoryl transfer from β-PGM to water. The other values of (k_cat)_rel are reported for reactions at saturating concentrations of ROH and activator.

^cFor transfer of the phosphoryl group to O-1 of xylose.

^dFor transfer of the phosphoryl group to O-6 of β-glucose 6-phosphate.