Table II.

Random peptide derived GalNAc-T isoenzyme Thr/Ser acceptor rate ratios^a

Isoenzyme	Phylogenetic family	Intrinsic Thr/Ser ratiob	Slope	r 2
GalNAc-T1	Family Ia	14.9 ± 0.7	−0.7 ± 0.1	0.87
GalNAc-T2	Family Ib	6.1 ± 0.3	−0.1 ± 0.03	0.70
GalNAc-T3	Family Ic	18.1 ± 1.2	−0.7 ± 0.1	0.81
GalNAc-T4	Family IIa	2.2 ± 0.3	−0.01 ± 0.04	n.ac
GalNAc-T5	Family Id	6.9 ± 0.2	−0.4 ± 0.1	0.82
GalNAc-T6	Family Ic	17.5 ± 1.1	−0.3 ± 0.06	0.86
GalNAc-T7	Family IIb	6.4 ± 0.9	−0.2 ± 0.4	n.ac
GalNAc-T10	Family IIb	2.7 ± 0.2	−0.1 ± 0.5	n.ac
GalNAc-T11	Family If	6.6 ± 0.1	−0.04 ± 0.02	0.84
GalNAc-T12	Family IIa	1.94 ± 0.3	−0.009 ± 0.005	n.ac
GalNAc-T13	Family Ia	11.90 ± 0.7	−0.08 ± 0.05	0.4
GalNAc-T16	Family Ib	5.65 ± 0.4	−0.2 ± 0.09	0.83

^aValues obtained from the least squares linear fit of the plots of Thr/Ser rate ratio vs. percent. Thr peptide glycosylation given in Figure 2.

^bTaken as the Y intercept of the plots in Figure 2.

^c r  ² values not reported as the Thr/Ser rate ratios do not vary with the percent glycosylation.