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. 2009 Mar;21(3):876–891. doi: 10.1105/tpc.108.062612

Table 2.

Comparison of Apparent Affinities and Maximal Catalytic Activities of Arabidopsis URH1 Expressed in Yeast or E. coli

Substrate/Expression System Km (mM) Vmax (mmol h−1 mg−1 Protein)
Uridine yeast 2.1 0.030
Uridine E. coli 0.8 18.281
Inosine E. coli 1.4 0.869
Adenosine E. coli 0.7 0.028
IPR E. coli 0.4 0.005