Boehning suspects that a calcium-calmodulin complex turns on the enzyme in response to millisecond pulses of neuronal activity, while CK2 activates it for seconds to minutes.
IRF3, a cytosolic protein, is inactive in uninfected cells; virus infection activates it by causing phosphorylation of its specific serine residues and its translocation to the nucleus, where it binds to the promoters of the target genes (Lin et al., 1998 and Sato et al., 1998).
In cultured cells, it was found that overexpression of YAP/TAZ inhibits β-catenin/TCF4 reporter activity and knockdown of YAP/TAZ activates it [ 90, 91].
CDC37 inhibited the HSP90 activity, whereas P23 and immunophilin FKBP51 activates it.
HslV protease has six subunits (Fig. 4), as does its unrelated chaperone ring HslU, which allosterically activates it [ 43].
IPA also inhibits PERK but, paradoxically, activates it at low concentrations, resulting in a bell-shaped activation profile.
Cohen-Armon and co-workers report an alternative mode of activation [ 85], where ERK2 interacts with PARP-1 and activates it independent of DNA strand breaks Figure 4B).
Such evidence would suggest a possible alternative interpretation of the results, in that the active form of caspase-3 binds pro-caspase-8 and activates it (Sartorius et al, 2001; Wajant, 2003), which in turn can activate caspase-3.
Nicholas Horne duly activates it: "Obviously Pietersen is the problem.
Future generations of the toy may incorporate a timer or even a motion sensor that activates it, but for now it runs only when you turn it on, and it runs only on batteries.
The phone, utilizing a specialized set of chips, listens at all times for the phrase "O.K., Google Now," which activates it, even if the screen is off and locked.
