CATH Domain 2ii4A01
|3.30.559.10||Chloramphenicol acetyltransferase-like domain|
|Superfamily||Chloramphenicol acetyltransferase-like domain|
|Functional Family||Dihydrolipoamide acetyltransferase component of pyruvate dehydrogenase complex|
based on mapping to UniProt P11181
2-methylpropanoyl-CoA + enzyme N(6)-(dihydrolipoyl)lysine = CoA + enzyme N(6)-(S-(2-methylpropanoyl)dihydrolipoyl)lysine.
-!- A multimer (24-mer) of this enzyme forms the core of the multienzyme 3-methyl-2-oxobutanoate dehydrogenase complex, and binds tightly both EC 220.127.116.11 and EC 18.104.22.168. -!- The lipoyl group of this enzyme is reductively 2-methylpropanoylated by EC 22.214.171.124, and the only observed direction catalyzed by EC 126.96.36.199 is that where this 2-methylpropanoyl is passed to coenzyme A. -!- In addition to the 2-methylpropanoyl group, formed when EC 188.8.131.52 acts on the oxoacid that corresponds with valine, this enzyme also transfers the 3-methylbutanoyl and S-2-methylbutanoyl groups, donated to it when EC 184.108.40.206 acts on the oxo acids corresponding with leucine and isoleucine.
UniProtKB Entries (1)
Lipoamide acyltransferase component of branched-chain alpha-keto acid dehydrogenase complex, mitochondrial
A synchronized substrate-gating mechanism revealed by cubic-core structure of the bovine branched-chain alpha-ketoacid dehydrogenase complex.