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. Author manuscript; available in PMC: 2009 Jun 11.
Published in final edited form as: FEBS Lett. 2008 May 12;582(13):1853–1858. doi: 10.1016/j.febslet.2008.04.054

Table 1.

Kinetic parameters of soybean Itpks

Km (µM) Vmax (µmol/mg/min) Vmax/Km
Ins(1,3,4)P3 Ins(3,4,5,6)P4 Ins(1,3,4)P3 Ins(3,4,5,6)P4 Ins(1,3,4)P3 Ins(3,4,5,6)P4
GmItpk1 3.7 ± 0.4 0.28 ± 0.004 0.5 ± 0.1 0.083 ± 0.02 0.135 0.3
GmItpk2 46.2 ± 6.1 0.78 ± 0.04 1.97 ± 0.3 0.76 ± 0.06 0.043 0.97
GmItpk3 43.4 ± 8.3 1.05 ± 0.16 0.86 ± 0.1 0.22 ± 0.1 0.02 0.21
GmItpk4 4.4 ± 0.6 0.7 ± 0.03 0.007±0.001 0.004±0.0003 0.002 0.006

Data are means and standard errors from 3–4 experiments.