Escherichia coli K-12 substr. MG1655 Reaction:

Superclasses: Reactions Classified By Conversion Type Simple Reactions Chemical Reactions
Reactions Classified By Substrate Small-Molecule Reactions

EC Number:

Enzymes and Genes:
2-amino-3-ketobutyrate CoA ligase Inferred from experiment : kbl

In Pathway: L-threonine degradation II

The reaction direction shown, that is, A + B ↔ C + D versus C + D ↔ A + B, is in accordance with the Enzyme Commission system.

Mass balance status: Balanced.

Enzyme Commission Primary Name: glycine C-acetyltransferase

Enzyme Commission Synonyms: 2-amino-3-ketobutyrate CoA ligase, 2-amino-3-ketobutyrate coenzyme A ligase, 2-amino-3-ketobutyrate-CoA ligase, glycine acetyltransferase, aminoacetone synthase, aminoacetone synθse, KBL, AKB ligase

This reaction is part of the primary route of threonine utilization, and is also a highly efficient alternate pathway for glycine and serine biosynthesis.

Enzyme Commission Summary:
This is a pyridoxal-phosphate-dependent enzyme that acts in concert with EC, L-threonine 3-dehydrogenase, in the degradation of threonine to form glycine [Edgar00]. This threonine degradation pathway is common to prokaryotic and eukaryotic cells and the two enzymes involved form a complex [Schmidt01].

Citations: [Mukherjee87, McGilvray69]

Gene-Reaction Schematic: ?

Gene-Reaction Schematic

Relationship Links: BRENDA:EC: , ENZYME:EC: , IUBMB-ExplorEnz:EC:


Edgar00: Edgar AJ, Polak JM (2000). "Molecular cloning of the human and murine 2-amino-3-ketobutyrate coenzyme A ligase cDNAs." Eur J Biochem 267(6);1805-12. PMID: 10712613

McGilvray69: McGilvray D, Morris JG (1969). "Utilization of L-threonine by a species of Arthrobacter. A novel catabolic role for "aminoacetone synthase"." Biochem J 112(5);657-71. PMID: 5821726

Mukherjee87: Mukherjee JJ, Dekker EE (1987). "Purification, properties, and N-terminal amino acid sequence of homogeneous Escherichia coli 2-amino-3-ketobutyrate CoA ligase, a pyridoxal phosphate-dependent enzyme." J Biol Chem 1987;262(30);14441-7. PMID: 3117785

Schmidt01: Schmidt A, Sivaraman J, Li Y, Larocque R, Barbosa JA, Smith C, Matte A, Schrag JD, Cygler M (2001). "Three-dimensional structure of 2-amino-3-ketobutyrate CoA ligase from Escherichia coli complexed with a PLP-substrate intermediate: inferred reaction mechanism." Biochemistry 40(17);5151-60. PMID: 11318637

Report Errors or Provide Feedback
Please cite the following article in publications resulting from the use of EcoCyc: Nucleic Acids Research 41:D605-12 2013
Page generated by SRI International Pathway Tools version 19.0 on Mon Oct 5, 2015, biocyc14.