The enzyme biotinylates a biotin carboxyl-carrier protein that is part of an acetyl-CoA carboxylase complex, enabling its subsequent carboxylation by EC 6.3.4.14, biotin carboxylase. The carboxyl group is eventually transferred to acetyl-CoA by EC 2.1.3.15, acetyl-CoA carboxytransferase. In some organisms the carrier protein is part of EC 6.4.1.2, acetyl-CoA carboxylase.
biotin ligase, bira protein, biotin-protein ligase, biotin holoenzyme synthetase, bacterial bira biotin ligase, biotin acetyl-coa carboxylase ligase, biotin:apocarboxylase ligase, holocarboxylase synthetase 1, group i biotin protein ligase, more
The enzyme biotinylates a biotin carboxyl-carrier protein that is part of an acetyl-CoA carboxylase complex, enabling its subsequent carboxylation by EC 6.3.4.14, biotin carboxylase. The carboxyl group is eventually transferred to acetyl-CoA by EC 2.1.3.15, acetyl-CoA carboxytransferase. In some organisms the carrier protein is part of EC 6.4.1.2, acetyl-CoA carboxylase.
i.e. ACC2, substrate is the recombinantly expressed His-tagged biotinoyl domain, ACC75, of ACC2. The apo-biotinoyl domain is biotinylated at Lys929 to form the holoprotein
activation by biotinylation, HCS is the enzyme responsible for specifically attaching biotin onto the mammalian biotin domains. Biotinylation is catalysed through a two-step reaction where biotin is first activated to biotinyl-5'-AMP in an ATP-dependent manner, the biotin is then transferred onto the epsilon-amino group of a specific target lysine residue. All biotin-dependent enzymes utilise the enzyme-bound biotin group for the transfer of CO2 between metabolites
activation by biotinylation. The biotinylated lysine itself is located in a hairpin turn between beta-strands 4 and 5 in the centre of the polypeptide, present in a Met-Lys-Met motif that is essentially invariant in all biotin domains. HCS may well contain proofreading activity to select appropriate substrates
acetyl-CoA carboxylase-1 and -2 perform the essential role of converting acetyl CoA to malonyl CoA, the first committed step in fatty acid synthesis, required for membrane biogenesis. The enzyme exists either as catalytic homodimers or associated with more highly active filamentous fibres. Development of an assay method using apo-pyruvate carboxylase partially purified from the livers of biotin-deficient rats for detection of biotin in fibroblast samples from healthy persons and patients with multiple carboxylase deficiency
protein-protein interaction between BPL and biotin-dependent enzymes is highly conserved. substrate recognition by BPLs occurs through conserved structural cues that govern the specificity of biotinylation, molecular modelling, overview. The region between Leu166 and Arg290 of BPL is required for catalysis. Development of an assay method using apo-pyruvate carboxylase partially purified from the livers of biotin-deficient rats for detection of biotin in samples from healthy persons and patients with multiple carboxylase deficiency
although mammals have multiple biotin-dependent enzymes there is only a single gene encoding holocarboxylase synthetase, HCS, responsible for all cellular biotinylation. The enzyme catalyzes the reactions of EC 6.3.4.10, EC 6.3.4.11, and EC 6.3.4.15, overview
holocarboxylase synthetase catalyzes the attachment of biotin to the epsilon-amino group of a specific lysine residue in apocarboxylases, biotinylation of biotin-dependent carboxylases requires ATP and proceeds in the following two steps
activation by biotinylation, HCS is the enzyme responsible for specifically attaching biotin onto the mammalian biotin domains. Biotinylation is catalysed through a two-step reaction where biotin is first activated to biotinyl-5'-AMP in an ATP-dependent manner, the biotin is then transferred onto the epsilon-amino group of a specific target lysine residue. All biotin-dependent enzymes utilise the enzyme-bound biotin group for the transfer of CO2 between metabolites
acetyl-CoA carboxylase-1 and -2 perform the essential role of converting acetyl CoA to malonyl CoA, the first committed step in fatty acid synthesis, required for membrane biogenesis. The enzyme exists either as catalytic homodimers or associated with more highly active filamentous fibres. Development of an assay method using apo-pyruvate carboxylase partially purified from the livers of biotin-deficient rats for detection of biotin in fibroblast samples from healthy persons and patients with multiple carboxylase deficiency
although mammals have multiple biotin-dependent enzymes there is only a single gene encoding holocarboxylase synthetase, HCS, responsible for all cellular biotinylation. The enzyme catalyzes the reactions of EC 6.3.4.10, EC 6.3.4.11, and EC 6.3.4.15, overview
holocarboxylase synthetase catalyzes the attachment of biotin to the epsilon-amino group of a specific lysine residue in apocarboxylases, biotinylation of biotin-dependent carboxylases requires ATP and proceeds in the following two steps
Simultaneous protein expression and modification: an efficient approach for production of unphosphorylated and biotinylated receptor tyrosine kinases by triple infection in the baculovirus expression system.
Biotin ligase tagging identifies proteins proximal to E-cadherin, including lipoma preferred partner, a regulator of epithelial cell-cell and cell-substrate adhesion.
holocarboxylase synthetase catalyzes the biotinylation of the four biotin-dependent carboxylases found in human, mitochondrial propionyl-CoA carboxylase, pyruvate carboxylase, beta-methylcrotonyl-CoA carboxylase, and cytosolic acetyl-CoA carboxylase
lung fibroblasts, quantitative determination of HCS in wild-type IMR-90 fibroblasts and in those recombinantly overexpressing human telomerase, evaluation as a cell model for investigation of HCS in epigenetic regulation, histone biotinylation in aging cells, overview
biotin deficiency, e.g. occuring in patients with BTD deficiency, in severely malnourished children in developing countries, and in individuals consuming large amounts of raw egg white which contains the protein avidin, has adverse effects on cellular and humoral immune functions, and it can lead to candida dermatitis and presented with absent delayed-hypersensitivity skin-tests responses, IgA deficiency, and subnormal percentages of T-lymphocytes in peripheral blood, overview
holocarboxylase synthetase, HCS, deficiency is an inborn error of biotin metabolism, leading to a multiple carboxylases deficiency. A Japanese male neonate with HCS deficiency received maternal administration of biotin from 33 weeks gestation, acylcarnitine profiles compared to control, phenotype, overview
structure-activity molecular modelling. Acetyl-CoA carboxylase-1 exists either as catalytic homodimers or associated with more highly active filamentous fibres. The region between Leu166 and Arg290 is required for catalysis
the N-terminal domain has a crucial effect on the enzymatic activity. The domain interacts not only with biotin acceptor protein, but also with the catalytic domain of hHCS. It recognizes the charged region of biotin acceptor protein, distinctly from the recognition by the catalytic domain. Human HCS shows a high degree of sequence homology in the catalytic domain with bacterial biotin ligases such as Escherichia coli BirA, but differs in the length and sequence of the N-terminus
naturally occuring mutation close to the active site and part of the ligand-binding loop, the mutation may not allow as much flexibility of this loop. As part of the hydrophobic pocket, making this polar residue would perturb biotin binding
naturally occuring mutation of a residue critical in loop covering the ligand-binding site. R508 co-ordinates to the backbone carbonyl N712 to form a salt bridge, removing this would result in a more flexible loop, analogous to EcBPL R118 and R121 that co-ordinate oxygens within the AMP phosphate group
HCS mutants with deletions up to Ala235 or Thr266 still show catalytic activity and can complement an enzyme-deficient Escherichia coli birA- strain. Enzyme deficiency can cause symptoms like ketoacidosis, feeding difficulties, hypotonia, seizures, developmental delay and dermal abnormalities such as rashes, dryness of the skin and alopecia, multiple carboxylase deficiency is caused by a lack of activity of the biotin-dependent enzymes, phenotypes, overview. Molecular modelling of mutations causing HCS deficiency, detailed overview
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CLONED (Commentary)
ORGANISM
UNIPROT
LITERATURE
cross-species activity of BPLs permitts functional cloning of the cDNA for human BPL through genetic complementation with a conditional lethal birA? strain of Escherichia coli
biotinylation of apo-carboxyl carrier protein, a subunit of acetyl-CoA carboxylase from E. coli is a sensitive and convenient assay method for biotin-[acetyl-CoA-carboxylase] ligase