The Enzyme Database

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Accepted name: putrescine aminotransferase
Reaction: putrescine + 2-oxoglutarate = 1-pyrroline + L-glutamate + H2O (overall reaction)
(1a) putrescine + 2-oxoglutarate = 4-aminobutanal + L-glutamate
(1b) 4-aminobutanal = 1-pyrroline + H2O (spontaneous)
For diagram of arginine catabolism, click here
Glossary: putrescine = butane-1,4-diamine
1-pyrroline = 3,4-dihydro-2H-pyrrole
Other name(s): putrescine-α-ketoglutarate transaminase; YgjG; putrescine:α-ketoglutarate aminotransferase; PAT; putrescine:2-oxoglutarate aminotransferase; putrescine transaminase
Systematic name: butane-1,4-diamine:2-oxoglutarate aminotransferase
Comments: A pyridoxal-phosphate protein [3]. The product, 4-aminobutanal, spontaneously cyclizes to form 1-pyrroline, which is a substrate for EC, aminobutyraldehyde dehydrogenase. Cadaverine and spermidine can also act as substrates [3]. Forms part of the arginine-catabolism pathway [2].
Links to other databases: BRENDA, EXPASY, KEGG, MetaCyc, CAS registry number: 98982-73-1
1.  Prieto-Santos, M.I., Martin-Checa, J., Balaña-Fouce, R. and Garrido-Pertierra, A. A pathway for putrescine catabolism in Escherichia coli. Biochim. Biophys. Acta 880 (1986) 242–244. [PMID: 3510672]
2.  Samsonova, N.N., Smirnov, S.V., Novikova, A.E. and Ptitsyn, L.R. Identification of Escherichia coli K12 YdcW protein as a γ-aminobutyraldehyde dehydrogenase. FEBS Lett. 579 (2005) 4107–4112. [PMID: 16023116]
3.  Samsonova, N.N., Smirnov, S.V., Altman, I.B. and Ptitsyn, L.R. Molecular cloning and characterization of Escherichia coli K12 ygjG gene. BMC Microbiol. 3 (2003) 2. [PMID: 12617754]
[EC created 2006]

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