2000
DOI: 10.1074/jbc.m909488199
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Marked Differences between Two Isoforms of Human Pyruvate Dehydrogenase Kinase

Abstract: Pyruvate dehydrogenase kinase (PDK) isoforms 2 and 3 were produced via co-expression with the chaperonins GroEL and GroES and purified with high specific activities in affinity tag-free forms. By using human components, we have evaluated how binding to the lipoyl domains of the dihydrolipoyl acetyltransferase (E2) produces the predominant changes in the rates of phosphorylation of the pyruvate dehydrogenase (E1) component by PDK2 and PDK3. E2 assembles as a 60-mer via its C-terminal domain and has mobile conne… Show more

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Cited by 110 publications
(203 citation statements)
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“…In mammals, there are four PDK isozymes, all of which have the characteristic carboxyl tails that are somewhat different in the amino acid sequences (2). Several lines of evidence suggest that PDK isozymes are markedly different with respect to their ability to interact with the lipoyl-bearing domain(s) (3,9). Here, we investigated the ability of the carboxyl tails derived from PDK1, PDK3, and PDK4 to support PDK2 activity and LBD2 binding.…”
Section: Discussionmentioning
confidence: 99%
See 1 more Smart Citation
“…In mammals, there are four PDK isozymes, all of which have the characteristic carboxyl tails that are somewhat different in the amino acid sequences (2). Several lines of evidence suggest that PDK isozymes are markedly different with respect to their ability to interact with the lipoyl-bearing domain(s) (3,9). Here, we investigated the ability of the carboxyl tails derived from PDK1, PDK3, and PDK4 to support PDK2 activity and LBD2 binding.…”
Section: Discussionmentioning
confidence: 99%
“…At least three of these isozymes (PDK1-PDK3) were directly shown to exist in a complex-bound state (3,5). All PDK isozymes have characteristic carboxyl tails that are markedly different in their amino acid composition (1,2).…”
Section: Activities and Interactions With Lbd2 Of Pdk2 Chimerasmentioning
confidence: 99%
“…Binding of PDKs to the lipoyl domains of E2 was shown to increase their catalytic efficiency (Baker et al, 2000). Examination of activities of four PDK isoenzymes towards free E1 indicated that not only site 1 can be phosphorylated in the absence of E2, but also site 2 by four PDKs and site 3 by PDK1 (at a slightly higher rate than site 2).…”
Section: Site-specificity Of Four Pdk Isoenzymesmentioning
confidence: 99%
“…for interaction with E1 (Baker et al, 2000). The phosphate group in the E1 active site could affect E1 interaction with the negatively charged residues of the lipoyl domain because of its size and anionic nature (Liu et al, 2001).…”
Section: Mechanism Of Inactivation Of Human E1 By Phosphorylation Of mentioning
confidence: 99%
“…The lipoyl-containing domains of the E2 cores function both as an anchor and a modulator for activities of the mitochondrial kinases. Studies with the lipoylated inner L2 domain have been complicated by the fact that the domain alone does not interact as efficiently as holo-E2p with the PDK isoforms, except for PDK3 (13,18). In this communication, we show that lip-LBD alone does not bind to BCK; however, the inclusion of various lengths of the previously neglected C-terminal hinge region results in the interaction between the lip-LBD constructs and BCK.…”
Section: Interaction Of Lipoic Acid-bearing Domain With Bckd Kinase 3mentioning
confidence: 72%