Involved in the degradation of the pyridine ring of trigonelline (TG; N-methylnicotinate) into succinate and methylamine as carbon and nitrogen sources, respectively. Catalyzes the NAD(+)-dependent oxidation of succinate semialdehyde to succinate. H2O + NAD(+) + succinate semialdehyde = 2 H(+) + NADH + succinate kcat is 61.5 sec(-1) for NAD as substrate. Homotetramer. Belongs to the aldehyde dehydrogenase family.