ART2A アクチベーター

ART2 activators encompass a group of chemical compounds that either provide the substrate required for ART2's enzymatic function or enhance its activity indirectly by stabilizing the enzyme and increasing substrate availability. Nicotinamide adenine dinucleotide (NAD+) is the principal substrate for ART2, and its increased concentration directly correlates with enhanced ART2 activity, as ART2 transfers ADP-ribose units from NAD+ to target proteins. Similarly, compounds like Nicotinamide, Nicotinic acid, Nicotinamide mononucleotide (NMN), and Nicotinamide riboside serve as precursors to NAD+, thus indirectly augmenting ART2's functional activity by expanding the pool of available NAD+. In contrast, compounds such as Thymidine and P1,P5-Di(adenosine-5') pentaphosphate act by preserving NAD+ levels, the former by inhibiting NAD+ degradation and the latter by blocking enzymes that consume NAD+, thereby indirectly supporting ART2's enzymatic action.

Furthermore, essential ions like Zinc (Zn2+) and Magnesium (Mg2+) play a crucial role as cofactors in the catalytic mechanism of ART2. Zinc ions can stabilize the ART2 structure, thus potentially enhancing its catalytic efficiency, while Magnesium ions are critical for the enzyme's optimal conformation and function. Adenosine and Deoxyadenosine contribute to the cellular salvage pathways, leading to increased NAD+ synthesis and hence facilitating ART2's ADP-ribosyltransferase activity.