Enzyme Source | Model | Km,u or S50,u | Vmax | n | Clint,u or Clmax,u |
---|---|---|---|---|---|
µM | pmol/min/mg total protein | µl/min/mg protein | |||
Cabotegravir | |||||
rUGT1A1 | Two Site | 27 (6)a | 17 (1)a | 0.6 | |
rUGT1A3 | MM | 46 (7) | 3 (0.1) | 0.06 | |
rUGT1A7 | MM | 43 (5) | 10 (0.3) | 0.2 | |
rUGT1A8 | MM | 344 (44) | 40 (2) | 0.1 | |
rUGT1A9 | Hill | 56 (7) | 61.4 (3) | 1.26 (0) | 1.1 |
Dolutegravir | |||||
rUGT1A1 | MM | 216 (26) | 507 (50) | 2.3 | |
rUGT1A3 | MM | 62 (7) | 18 (0.7) | 0.3 | |
rUGT1A7 | MM | 9 (2) | 1 (0) | 0.1 | |
rUGT1A8 | Hill | 44 (5) | 7 (0) | 1.9 (0) | 0.2 |
rUGT1A9 | Hill | 39 (3) | 39 (2) | 1.9 (0) | 1.0 |
Raltegravir | |||||
rUGT1A1 | MM | 260 (17) | 334 (7) | 1.3 | |
rUGT1A3 | Hill | 41 (2) | 30 (1) | 1.7 (0) | 0.55 |
rUGT1A7 | MM | 452 (56) | 23 (1) | 0.05 | |
rUGT1A8 | MM | 386 (57) | 39 (2) | 0.1 | |
rUGT1A9 | Hill | 193 (12) | 459 (14) | 1.45 (0) | 1.3 |
Clint = Vmax/Km or Clmax = . n, Hill coefficient in the Hill equation.
↵a The low-affinity enzyme substrate concentration versus velocity did not saturate, and the estimated Km (>2 mM) and Vmax values were unreliable. Thus, only the high Km is presented and calculated for Clint,u.