Succinate-semialdehyde dehydrogenase 2 (SSADH2) and similar proteins are in this CD. SSADH1 (GabD1, EC=1.2.1.16) catalyzes the NADP(+)-dependent oxidation of succinate semialdehyde to succinate. SSADH activity in Mycobacterium tuberculosis is encoded by both gabD1 (Rv0234c) and gabD2 (Rv1731), however ,the Vmax of GabD1 was shown to be much higher than that of GabD2, and GabD2 (SSADH2) is likely to serve physiologically as a dehydrogenase for a different aldehyde(s).