a-ketoisocaproate, a-keto-b-methylvalerate, or a-ketoisovalerate + glutamate <=> leu, ile, or val + alpha-ketoglutarate [BCAT2]

Stable Identifier
R-HSA-508179
Type
Reaction [transition]
Species
Homo sapiens
Compartment
mitochondrial matrix
ReviewStatus
5/5
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a-ketoisocaproate, a-keto-b-methylvalerate, or a-ketoisovalerate + glutamate <=> leu, ile, or val + alpha-ketoglutarate [BCAT2]
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Mitochondrial branched-chain-amino-acid aminotransferase (BCAT2) catalyzes the reversible reactions of alpha-ketoisocaproate, alpha-keto-beta-methylvalerate, or a-ketoisovalerate with glutamate to form leucine, isoleucine, or valine, respectively, and alpha-ketoglutarate (Bledsoe et al. 1997). The active enzyme is a homodimer (Yennawar et al. 2001, 2002). In the body, this enzyme is widely expressed but is especially abundant in muscle tissue.
Literature References
PubMed ID Title Journal Year
9165094 Cloning of the rat and human mitochondrial branched chain aminotransferases (BCATm)

Bledsoe, RK, Dawson, PA, Hutson, SM

Biochim Biophys Acta 1997
12269802 Crystal structures of human mitochondrial branched chain aminotransferase reaction intermediates: ketimine and pyridoxamine phosphate forms

Yennawar, NH, Conway, ME, Yennawar, HP, Farber, GK, Hutson, SM

Biochemistry 2002
11264579 The structure of human mitochondrial branched-chain aminotransferase.

Yennawar, NH, Dunbar, J, Conway, ME, Hutson, SM, Farber, GK

Acta Crystallogr D Biol Crystallogr 2001
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Event Information
Reverse Reaction
leu, ile, or val + alpha-ketoglutarate <=> a-ketoisocaproate, a-keto-b-methylvalerate, or a-ketoisovalerate + glutamate [BCAT2] (Homo sapiens)
Catalyst Activity

branched-chain-amino-acid transaminase activity of BCAT2 dimer [mitochondrial matrix]

Physical Entity
BCAT2 dimer [mitochondrial matrix] (Homo sapiens)
Activity
branched-chain-amino-acid transaminase activity (GO:0004084)
Orthologous Events
a-ketoisocaproate, a-keto-b-methylvalerate, or a-ketoisovalerate + glutamate <=> leu, ile, or val + alpha-ketoglutarate [BCAT2] (Bos taurus)
a-ketoisocaproate, a-keto-b-methylvalerate, or a-ketoisovalerate + glutamate <=> leu, ile, or val + alpha-ketoglutarate [BCAT2] (Caenorhabditis elegans)
a-ketoisocaproate, a-keto-b-methylvalerate, or a-ketoisovalerate + glutamate <=> leu, ile, or val + alpha-ketoglutarate [BCAT2] (Canis familiaris)
a-ketoisocaproate, a-keto-b-methylvalerate, or a-ketoisovalerate + glutamate <=> leu, ile, or val + alpha-ketoglutarate [BCAT2] (Danio rerio)
a-ketoisocaproate, a-keto-b-methylvalerate, or a-ketoisovalerate + glutamate <=> leu, ile, or val + alpha-ketoglutarate [BCAT2] (Dictyostelium discoideum)
a-ketoisocaproate, a-keto-b-methylvalerate, or a-ketoisovalerate + glutamate <=> leu, ile, or val + alpha-ketoglutarate [BCAT2] (Drosophila melanogaster)
a-ketoisocaproate, a-keto-b-methylvalerate, or a-ketoisovalerate + glutamate <=> leu, ile, or val + alpha-ketoglutarate [BCAT2] (Mus musculus)
a-ketoisocaproate, a-keto-b-methylvalerate, or a-ketoisovalerate + glutamate <=> leu, ile, or val + alpha-ketoglutarate [BCAT2] (Rattus norvegicus)
a-ketoisocaproate, a-keto-b-methylvalerate, or a-ketoisovalerate + glutamate <=> leu, ile, or val + alpha-ketoglutarate [BCAT2] (Saccharomyces cerevisiae)
a-ketoisocaproate, a-keto-b-methylvalerate, or a-ketoisovalerate + glutamate <=> leu, ile, or val + alpha-ketoglutarate [BCAT2] (Schizosaccharomyces pombe)
a-ketoisocaproate, a-keto-b-methylvalerate, or a-ketoisovalerate + glutamate <=> leu, ile, or val + alpha-ketoglutarate [BCAT2] (Sus scrofa)
a-ketoisocaproate, a-keto-b-methylvalerate, or a-ketoisovalerate + glutamate <=> leu, ile, or val + alpha-ketoglutarate [BCAT2] (Xenopus tropicalis)
Cross References
RHEA
Authored
D'Eustachio, P  (2010-02-18)
Reviewed
Jassal, B  (2010-02-27)
Created
D'Eustachio, P  (2010-02-11)
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