Aldehyde dehydrogenase that shows activity toward n-alkanals (C(4) to C(14)), with a preference for longer carbon chains. The best substrate is tetradecanal. a long-chain fatty aldehyde + H2O + NAD(+) = a long-chain fatty acid + 2 H(+) + NADH Completely inhibited by p-chloromercuribenzoate and N-ethylmaleimide. Strongly inhibited by iodoacetate. Inhibited by Pb(2+), Fe(3+), Ag(+) and Hg(2+) and partially inhibited by several other metal ions Mn(2+), Zn(2+) and Cu(2+). Optimum pH is 9.5. Optimum temperature is 43 degrees Celsius. Homotetramer. Reduced aldehyde dehydrogenase activity toward n-tetradecanal, although cells are still able to grow on n-hexadecane to some extent. Belongs to the aldehyde dehydrogenase family.