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. 2008 Jun 13;190(16):5642–5649. doi: 10.1128/JB.00526-08

TABLE 3.

Comparison of CDP-ribitol synthase activities of different loci

Activity, enzyme, and substrate Km (μM) kcat (s−1) kcat/Km (M−1/s−1)
Reductase activity
    TarI′J′
        NADPH 6.21 ± 1.07 0.41 ± 0.01 6.60 × 104
        Ribulose-5-P 11.0 ± 0.9 3.73 × 104
    TarIJa
        NADPH 6.74 ± 1.64 0.79 ± 0.06 1.17 × 105
        Ribulose-5-P 28.5 ± 13.1 2.77 × 104
Cytidylyltransferase activity
    TarI′J′
        CTP 38.7 ± 6.20 66.7 ± 1.4 1.72 × 106
        Ribitol-5-P 102.2 ± 9.6 6.53 × 105
    TarIJa
        CTP 78.9 ± 33.2 76.8 ± 6.5 9.73 × 105
        Ribitol-5-P 1,280 ± 390 5.98 × 104
a

Data for TarIJ were previously published by Pereira et al. (26).