Intracellular mono-ADP-ribosyltransferase that may play a role in different processes through the mono-ADP-ribosylation of proteins involved in those processes. Required for amino acid starvation-induced mono-ADP-ribosylation and subsequent formation of Sec bodies - which are stress assemblies that promote cell survival by preserving components of the ER exit sites (ERES) during amino-acid starvation. Catalyzes the mono-ADP-ribosylation of Sec16 which is essential for Sec body formation. L-aspartyl-[protein] + NAD(+) = 4-O-(ADP-D-ribosyl)-L-aspartyl-[protein] + nicotinamide L-lysyl-[protein] + NAD(+) = H(+) + N(6)-(ADP-D-ribosyl)-L-lysyl-[protein] + nicotinamide L-glutamyl-[protein] + NAD(+) = 5-O-(ADP-D-ribosyl)-L-glutamyl-[protein] + nicotinamide Membrane localization is required for mono-ADP-ribosylation and Sec body formation. The lumenal and transmembrane domains are necessary for mono-ADP-ribosylation and Sec body formation. Belongs to the ARTD/PARP family.