title: The biotin carboxylase-biotin carboxyl carrier protein complex of Escherichia coli acetyl-CoA carboxylase.
abstract: Escherichia coli acetyl-CoA carboxylase (ACC) is composed of four different protein molecules. These proteins form a large but very unstable complex. Hints of a sub-complex between the biotin carboxylase (BC) and biotin carboxyl carrier protein (BCCP) subunits have been reported in the literature, but the complex was not isolated and thus the protein stoichiometry could not be determined. We report isolation of the BC.BCCP complex. By use of affinity chromatography using two different affinity tags it was shown that the complex consists of a two BCCP molecules per BC molecule. The molar ratio in the complex is the same as the ratio of the subunit proteins synthesized in vivo. We conclude that the complex consists of a dimer of BC plus four BCCP molecules instead of the 2BC.2BCCP complex previously assumed. This subunit ratio allows two conflicting models of the ACC mechanism to be rectified. We also report that the N-terminal 30 or so residues of BCCP are responsible for the interaction of BCCP with BC and that the BC.BCCP complex is a substrate for biotinylation in vitro.
authors.affiliation: Department of Microbiology, University of Illinois, Urbana, Illinois 61801, USA.
authors.forename: Eunjoo
authors.initials: E
authors.lastname: Choi-Rhee
authors.forename: John E
authors.initials: JE
authors.lastname: Cronan
mesh_terms: D000103:Acetyl-CoA Carboxylase / Q000737:chemistry / Q000235:genetics* / Q000378:metabolism; D000595:Amino Acid Sequence; D001483:Base Sequence; D019921:Biotinylation; D019731:Carbon-Nitrogen Ligases / Q000235:genetics* / Q000378:metabolism; D002352:Carrier Proteins / Q000737:chemistry / Q000235:genetics* / Q000378:metabolism; D002846:Chromatography, Affinity; D004926:Escherichia coli / Q000201:enzymology* / Q000235:genetics; D054889:Fatty Acid Synthase, Type II; D066298:In Vitro Techniques; D008969:Molecular Sequence Data; D009097:Multienzyme Complexes / Q000235:genetics / Q000302:isolation & purification / Q000378:metabolism; D016296:Mutagenesis; D017434:Protein Structure, Tertiary
chemical_list: D002352:Carrier Proteins; D009097:Multienzyme Complexes; D054889:Fatty Acid Synthase, Type II; D019731:Carbon-Nitrogen Ligases; C019791:biotin carboxylase; D000103:Acetyl-CoA Carboxylase; C079633:biotin carboxyl carrier protein