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- W1994430465 abstract "The mammalian pyruvate dehydrogenase complex, Mr 8.5 × 106, contains an additional tightly bound 50000-Mr polypeptide, component X, which copurifies with the intact assembly. Small amounts of the individual E2 and X polypeptides were obtained by elution of the protein bands from SDS/polyacrylamide gels. One-dimensional peptide mapping studies with 125I-labelled lipoyl acetyltransferase (E2) and component X subunits indicate that these two proteins are structurally distinct entities. Similar analysis of purified subunits, initially radiolabelled in the intact complex in the presence of [2-14C]pyruvate and N-ethyl-[2,3-14C]maleimide confirm that distinct 14C-labelled peptides are generated from these two species. These protein-chemical data supplement recent immunological findings, which demonstrate that component X is not a proteolytic fragment of the larger lipoyl acetyltransferase (Mr 70000) subunit. Incubation of the native PDC in the presence of [2-14C]pyruvate leads to rapid uptake of radiolabel, presumably as acetyl groups, into both E2 and protein X. Specific incorporation of acetyl groups declines to a similar extent on both polypeptides after inhibiting pyruvate dehydrogenase (E1) activity by phosphorylation or omitting thiamine diphosphate (TPP) from the assay mixture. Addition of CoASH promotes the parallel deacetylation of both lipoyl acetyltransferase and protein X in a reaction which displays sensitivity to N-ethylmaleimide." @default.
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- W1994430465 date "1986-08-01" @default.
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- W1994430465 title "The Mr-50000 polypeptide of mammalian pyruvate dehydrogenase complex participates in the acetylation reactions" @default.
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- W1994430465 doi "https://doi.org/10.1111/j.1432-1033.1986.tb09795.x" @default.
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