... produceL-glutamate. These three aminoacids do not induce the alc genes while, as expected,L-proline and L-arginine do induce the prnD gene. This wasalso the case in a strain constitutively overexpressing the alcR ... with either ethylamineorL-threonine as the nitrogen source (results not shown).Catabolism ofL-proline and L-arginine does notlead to induction of the alcgenesL-Proline and L-arginine ... asL-valine,L-isoleucine,L-arginine and L-proline, produces aldehydesthat are either not accumulated or fail to induce the alcsystem. On the other hand, catabolism ofD-galacturonicacid and putrescine,...