Properties of gamma-aminobutyraldehyde dehydrogenase from Escherichia coli.
gamma-Aminobutyraldehyde dehydrogenase from Escherichia coli K-12 has been purified and characterized from cell mutants able to grow in putrescine as the sole carbon and nitrogen source. The enzyme has an Mr of 195,000 +/- 10,000 in its dimeric form with an Mr of 95,000 +/- 1,000 for each subunit, a pH optimum at 5.4 in sodium citrate buffer, and does not require bivalent cations for its activity. Km values are 31.3 +/- 6.8 microM and 53.8 +/- 7.4 microM for delta-1-pyrroline and NAD+, respectively. An inhibitory capacity for NADH is also shown using the purified enzyme.
D000445:Aldehyde Oxidoreductases / Q000302:isolation & purification / Q000378:metabolism*; D004926:Escherichia coli / Q000201:enzymology*; D007700:Kinetics; D046911:Macromolecular Substances; D008970:Molecular Weight; D013816:Thermodynamics
D046911:Macromolecular Substances; D000445:Aldehyde Oxidoreductases; C019679:aminobutyraldehyde dehydrogenase