ExplorEnz: EC 2.6.1.81

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2.6.1.81

Accepted name:

succinylornithine transaminase

Reaction:

N²-succinyl-L-ornithine + 2-oxoglutarate = N-succinyl-L-glutamate 5-semialdehyde + L-glutamate

For diagram of arginine catabolism, click here

Other name(s):

succinylornithine aminotransferase; N²-succinylornithine 5-aminotransferase; AstC; SOAT; 2-N-succinyl-L-ornithine:2-oxoglutarate 5-aminotransferase

Systematic name:

N²-succinyl-L-ornithine:2-oxoglutarate 5-aminotransferase

Comments:

A pyridoxal-phosphate protein. Also acts on N²-acetyl-L-ornithine and L-ornithine, but more slowly [3]. In Pseudomonas aeruginosa, the arginine-inducible succinylornithine transaminase, acetylornithine transaminase (EC 2.6.1.11) and ornithine aminotransferase (EC 2.6.1.13) activities are catalysed by the same enzyme, but this is not the case in all species [5]. This is the third enzyme in the arginine succinyltransferase (AST) pathway for the catabolism of arginine [1]. This pathway converts the carbon skeleton of arginine into glutamate, with the concomitant production of ammonia and conversion of succinyl-CoA into succinate and CoA. The five enzymes involved in this pathway are EC 2.3.1.109 (arginine N-succinyltransferase), EC 3.5.3.23 (N-succinylarginine dihydrolase), EC 2.6.1.81 (succinylornithine transaminase), EC 1.2.1.71 (succinylglutamate-semialdehyde dehydrogenase) and EC 3.5.1.96 (succinylglutamate desuccinylase) [3,6].

Links to other databases:

BRENDA, EXPASY, Gene, KEGG, MetaCyc, PDB

References:

1.	Vander Wauven, C. and Stalon, V. Occurrence of succinyl derivatives in the catabolism of arginine in Pseudomonas cepacia. J. Bacteriol. 164 (1985) 882–886. [PMID: 2865249]
2.	Schneider, B.L., Kiupakis, A.K. and Reitzer, L.J. Arginine catabolism and the arginine succinyltransferase pathway in Escherichia coli. J. Bacteriol. 180 (1998) 4278–4286. [PMID: 9696779]
3.	Cunin, R., Glansdorff, N., Pierard, A. and Stalon, V. Biosynthesis and metabolism of arginine in bacteria. Microbiol. Rev. 50 (1986) 314–352. [PMID: 3534538]
4.	Itoh, Y. Cloning and characterization of the aru genes encoding enzymes of the catabolic arginine succinyltransferase pathway in Pseudomonas aeruginosa. J. Bacteriol. 179 (1997) 7280–7290. [DOI] [PMID: 9393691]
5.	Stalon, V., Vander Wauven, C., Momin, P. and Legrain, C. Catabolism of arginine, citrulline and ornithine by Pseudomonas and related bacteria. J. Gen. Microbiol. 133 (1987) 2487–2495. [DOI] [PMID: 3129535]

[EC 2.6.1.81 created 2006]