ADP-ribosyltransferase that mediates mono-ADP-ribosylation of glutamate, aspartate and cysteine residues on target proteins (PubMed:23275542, PubMed:25043379, PubMed:30373764). Acts as a negative regulator of AHR by mediating mono-ADP-ribosylation of AHR, leading to inhibit transcription activator activity of AHR (PubMed:23275542, PubMed:30373764). L-aspartyl-[protein] + NAD(+) = 4-O-(ADP-D-ribosyl)-L-aspartyl-[protein] + nicotinamide L-glutamyl-[protein] + NAD(+) = 5-O-(ADP-D-ribosyl)-L-glutamyl-[protein] + nicotinamide L-cysteinyl-[protein] + NAD(+) = H(+) + nicotinamide + S-(ADP-D-ribosyl)-L-cysteinyl-[protein] ADP-ribosyltransferase activity is inhibited by PJ34; inhibition is however not specific to TIPARP and other PARP-domain containing proteins are also inhibited by PJ34 (PubMed:30373764). Partially inhibited by KU0058948 (PubMed:30373764). Interacts with AHR. Auto-mono-ADP-ribosylated. Belongs to the ARTD/PARP family.