title: Sequence analysis, biogenesis, and mitochondrial import of the alpha-subunit of rat liver propionyl-CoA carboxylase.
abstract: We have cloned and sequenced cDNAs encoding the alpha-subunit of rat liver propionyl-CoA carboxylase (PCC), a biotin-dependent, mitochondrial matrix protein. The full-length cDNA spans 3327 base pairs, has a long (895 base pairs) 5'-untranslated region, and encodes a protein of 721 amino acids. In vitro transcription and translation of the full-length rat alpha-PCC cDNA produces a product which is immunoprecipitable with antibodies specific to PCC and has the same apparent molecular weight as in vivo synthesized alpha-PCC. Rat liver alpha-PCC precursor is not quantitatively biotinylated when synthesized in a cell-free rabbit reticulocyte system. Nevertheless, when incubated with isolated rat liver mitochondria in vitro, the precursor is imported and proteolytically cleaved to its mature form. A sequence comparison of rat liver alpha-PCC and other biotinylated polypeptides reveals the absolute conservation of three glycines and one valine in the region surrounding the biotinylated lysine residue. This pattern of conserved residues is also present in lipoylated proteins, where lipoic acid is similarly, covalently attached to a lysine residue. A possible functional role for the conserved glycine residues and further sequence similarity surrounding the site of biotinylation and lipoylation is discussed.
authors.affiliation: Department of Human Genetics, Yale University School of Medicine, New Haven, Connecticut 06510.
authors.forename: M F
authors.initials: MF
authors.lastname: Browner
authors.forename: F
authors.initials: F
authors.lastname: Taroni
authors.forename: E
authors.initials: E
authors.lastname: Sztul
authors.forename: L E
authors.initials: LE
authors.lastname: Rosenberg
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D001483:Base Sequence; D002262:Carboxy-Lyases / Q000096:biosynthesis / Q000235:genetics*; D002478:Cells, Cultured; D003001:Cloning, Molecular; D004247:DNA / Q000235:genetics; D006801:Humans; D008099:Liver / Q000201:enzymology*; D046911:Macromolecular Substances; D043586:Methylmalonyl-CoA Decarboxylase; D008930:Mitochondria, Liver / Q000201:enzymology*; D008969:Molecular Sequence Data; D014176:Protein Biosynthesis; D011499:Protein Processing, Post-Translational; D051381:Rats; D011915:Rats, Inbred BUF; D015183:Restriction Mapping; D012689:Sequence Homology, Nucleic Acid; D014158:Transcription, Genetic
chemical_list: D046911:Macromolecular Substances; D004247:DNA; D002262:Carboxy-Lyases; D043586:Methylmalonyl-CoA Decarboxylase