IUBMB Enzyme Nomenclature


Accepted name: [lysine-biosynthesis-protein LysW]—L-2-aminoadipate ligase

Reaction: ATP + [lysine-biosynthesis-protein LysW]-C-terminal-L-glutamate + L-2-aminoadipate = ADP + phosphate + [lysine-biosynthesis-protein LysW]-C-terminal-γ-(L-2-aminoadip-2-yl)-L-glutamate

Other name(s): α-aminoadipate-lysW ligase lysX (gene name); LysX (ambiguous); AAA—LysW ligase

Systematic name: [lysine-biosynthesis-protein LysW]-C-terminal-L-glutamate:L-2-aminoadipate ligase (ADP-forming)

Comments: The enzymes from the thermophilic bacterium Thermus thermophilus and the thermophilic archaea Sulfolobus acidocaldarius and Sulfolobus tokodaii protect the amino group of L-2-aminoadipate by conjugation to the carrier protein LysW. This reaction is part of the lysine biosynthesis pathway in these organisms.

Links to other databases: BRENDA, EXPASY, KEGG, Metacyc, CAS registry number:


1. Vassylyeva, M.N., Sakai, H., Matsuura, T., Sekine, S., Nishiyama, M., Terada, T., Shirouzu, M., Kuramitsu, S., Vassylyev, D.G. and Yokoyama, S. Cloning, expression, purification, crystallization and initial crystallographic analysis of the lysine-biosynthesis LysX protein from Thermus thermophilus HB8. Acta Crystallogr. D Biol. Crystallogr. 59 (2003) 1651-1652. [PMID: 12925802]

2. Horie, A., Tomita, T., Saiki, A., Kono, H., Taka, H., Mineki, R., Fujimura, T., Nishiyama, C., Kuzuyama, T. and Nishiyama, M. Discovery of proteinaceous N-modification in lysine biosynthesis of Thermus thermophilus. Nat. Chem. Biol. 5 (2009) 673-679. [PMID: 19620981]

3. Ouchi, T., Tomita, T., Horie, A., Yoshida, A., Takahashi, K., Nishida, H., Lassak, K., Taka, H., Mineki, R., Fujimura, T., Kosono, S., Nishiyama, C., Masui, R., Kuramitsu, S., Albers, S.V., Kuzuyama, T. and Nishiyama, M. Lysine and arginine biosyntheses mediated by a common carrier protein in Sulfolobus. Nat. Chem. Biol. 9 (2013) 277-283. [PMID: 23434852]

[EC created 2014]

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