title: Molecular cloning and analysis of the expression of the E1 beta subunit of branched chain alpha-ketoacid dehydrogenase in mice.
abstract: The cDNA sequence encoding the murine liver E1 beta subunit of the branched-chain alpha-ketoacid dehydrogenase complex (BCKAD) was determined. In the region encoding the mature E1 beta subunit protein, both the nucleotide composition and predicted amino acid sequence are highly conserved between murine, rat, human, and bovine species. In contrast, they are less well conserved in the 5' sequence encoding the amino terminal preprotein sequence and 3' untranslated region. The pattern of tissue-specific expression of three BCKAD subunit RNAs was determined to be similar in both rat and murine tissues except for that observed in murine liver, where a higher than expected level of E1 beta subunit RNA was observed. Variation in the levels of this subunit might play a major role in the regulation of the overall ability of the murine liver to modulate BCKAD content in response to changing physiologic needs.
authors.affiliation: Department of Pediatrics, University of Maryland School of Medicine, Baltimore 21201.
authors.forename: J M
authors.initials: JM
authors.lastname: Chinsky
authors.forename: P A
authors.initials: PA
authors.lastname: Costeas
mesh_terms: D042942:3-Methyl-2-Oxobutanoate Dehydrogenase (Lipoamide); D000595:Amino Acid Sequence; D000818:Animals; D001483:Base Sequence; D002417:Cattle; D003001:Cloning, Molecular; D017124:Conserved Sequence; D018076:DNA, Complementary / Q000737:chemistry / Q000378:metabolism; D015870:Gene Expression; D006801:Humans; D007658:Ketone Oxidoreductases / Q000096:biosynthesis* / Q000235:genetics*; D007668:Kidney / Q000201:enzymology; D008099:Liver / Q000201:enzymology; D046911:Macromolecular Substances; D051379:Mice; D008807:Mice, Inbred BALB C; D008809:Mice, Inbred C3H; D008810:Mice, Inbred C57BL; D008969:Molecular Sequence Data; D009097:Multienzyme Complexes / Q000096:biosynthesis* / Q000235:genetics*; D009928:Organ Specificity; D051381:Rats; D017207:Rats, Sprague-Dawley; D013045:Species Specificity
chemical_list: D018076:DNA, Complementary; D046911:Macromolecular Substances; D009097:Multienzyme Complexes; D007658:Ketone Oxidoreductases; D042942:3-Methyl-2-Oxobutanoate Dehydrogenase (Lipoamide)