Bile acid-CoA:amino acid N-acyltransferase

NameBile acid-CoA:amino acid N-acyltransferase
Synonyms2.3.1.65 BACAT Glycine N-choloyltransferase Long-chain fatty-acyl-CoA hydrolase
Gene NameBAAT
OrganismHuman
Amino acid sequence
>lcl|BSEQ0019265|Bile acid-CoA:amino acid N-acyltransferase
MIQLTATPVSALVDEPVHIRATGLIPFQMVSFQASLEDENGDMFYSQAHYRANEFGEVDL
NHASSLGGDYMGVHPMGLFWSLKPEKLLTRLLKRDVMNRPFQVQVKLYDLELIVNNKVAS
APKASLTLERWYVAPGVTRIKVREGRLRGALFLPPGEGLFPGVIDLFGGLGGLLEFRASL
LASRGFASLALAYHNYEDLPRKPEVTDLEYFEEAANFLLRHPKVFGSGVGVVSVCQGVQI
GLSMAIYLKQVTATVLINGTNFPFGIPQVYHGQIHQPLPHSAQLISTNALGLLELYRTFE
TTQVGASQYLFPIEEAQGQFLFIVGEGDKTINSKAHAEQAIGQLKRHGKNNWTLLSYPGA
GHLIEPPYSPLCCASTTHDLRLHWGGEVIPHAAAQEHAWKEIQRFLRKHLIPDVTSQL
Number of residues418
Molecular Weight46298.865
Theoretical pI7.0
GO Classification
Functions
    N-acyltransferase activity
palmitoyl-CoA hydrolase activity
glycine N-choloyltransferase activity
long-chain acyl-CoA hydrolase activity
medium-chain acyl-CoA hydrolase activity
very long chain acyl-CoA hydrolase activity
carboxylic ester hydrolase activity
receptor binding
Processes
    organ regeneration
bile acid biosynthetic process
bile acid metabolic process
bile acid and bile salt transport
small molecule metabolic process
acyl-CoA metabolic process
glycine metabolic process
taurine metabolic process
liver development
bile acid conjugation
fatty acid metabolic process
Components
    peroxisome
cytosol
peroxisomal matrix
General FunctionVery long chain acyl-coa hydrolase activity
Specific FunctionInvolved in bile acid metabolism. In liver hepatocytes catalyzes the second step in the conjugation of C24 bile acids (choloneates) to glycine and taurine before excretion into bile canaliculi. The major components of bile are cholic acid and chenodeoxycholic acid. In a first step the bile acids are converted to an acyl-CoA thioester, either in peroxisomes (primary bile acids deriving from the cholesterol pathway), or cytoplasmic at the endoplasmic reticulum (secondary bile acids). May catalyze the conjugation of primary or secondary bile acids, or both. The conjugation increases the detergent properties of bile acids in the intestine, which facilitates lipid and fat-soluble vitamin absorption. In turn, bile acids are deconjugated by bacteria in the intestine and are recycled back to the liver for reconjugation (secondary bile acids). May also act as an acyl-CoA thioesterase that regulates intracellular levels of free fatty acids. In vitro, catalyzes the hydrolysis of long- and very long-chain saturated acyl-CoAs to the free fatty acid and coenzyme A (CoASH), and conjugates glycine to these acyl-CoAs.
Transmembrane Regions
GenBank Protein ID532505
UniProtKB IDQ14032
UniProtKB Entry NameBAAT_HUMAN
Cellular LocationCytoplasm
Gene sequence
>lcl|BSEQ0019266|Bile acid-CoA:amino acid N-acyltransferase (BAAT)
ATGATCCAGTTGACAGCTACCCCTGTGAGTGCACTTGTTGATGAGCCAGTGCATATCCGA
GCTACAGGCCTGATTCCCTTTCAGATGGTGAGTTTTCAGGCATCACTGGAAGATGAAAAC
GGAGACATGTTTTATTCTCAAGCCCACTATAGGGCCAATGAATTCGGTGAGGTGGACCTG
AATCATGCTTCTTCACTTGGAGGGGATTATATGGGAGTCCACCCCATGGGTCTCTTCTGG
TCTCTGAAACCTGAAAAGCTATTAACAAGACTGTTGAAAAGAGATGTGATGAATAGGCCT
TTCCAGGTCCAAGTAAAACTTTATGACTTAGAGTTAATAGTGAACAATAAAGTTGCCAGT
GCTCCAAAGGCCAGCCTGACTTTGGAGAGGTGGTATGTGGCACCTGGTGTCACACGAATT
AAGGTTCGAGAAGGCCGCCTTCGAGGAGCTCTCTTTCTCCCTCCAGGAGAGGGTCTCTTC
CCAGGGGTAATTGATTTGTTTGGTGGTTTGGGTGGGCTGCTTGAATTTCGGGCCAGCCTC
CTAGCCAGTCGTGGCTTCGCCTCCTTGGCCTTGGCTTACCATAACTATGAAGACCTGCCC
CGCAAACCAGAAGTAACAGATTTGGAATATTTTGAGGAGGCTGCCAACTTTCTCCTGAGA
CATCCAAAGGTCTTTGGCTCAGGCGTTGGGGTAGTCTCTGTATGTCAAGGAGTACAGATT
GGACTATCTATGGCTATTTACCTAAAGCAAGTCACAGCCACGGTACTTATTAATGGGACC
AACTTTCCTTTTGGCATTCCACAGGTATATCATGGTCAGATCCATCAGCCCCTTCCCCAT
TCTGCACAATTAATATCCACCAATGCCTTGGGGTTACTAGAGCTCTATCGCACTTTTGAG
ACAACTCAAGTTGGGGCCAGTCAATATTTGTTTCCTATTGAAGAGGCCCAGGGGCAATTC
CTCTTCATTGTAGGAGAAGGTGATAAGACTATCAACAGCAAAGCACACGCTGAACAAGCC
ATAGGACAGCTGAAGAGACATGGGAAGAACAACTGGACCCTGCTATCTTACCCTGGGGCA
GGCCACCTGATAGAACCTCCCTATTCTCCTCTGTGCTGTGCCTCAACGACCCACGATTTG
AGGTTACACTGGGGAGGAGAGGTGATCCCACACGCAGCTGCACAGGAACATGCTTGGAAG
GAGATCCAGAGATTTCTCAGGAAGCACCTCATTCCAGATGTGACCAGTCAACTCTAA
GenBank Gene IDL34081
GeneCard IDNone
GenAtlas IDBAAT
HGNC IDHGNC:932
Chromosome Location9
Locus9q22.3
References
  1. Falany CN, Johnson MR, Barnes S, Diasio RB: Glycine and taurine conjugation of bile acids by a single enzyme. Molecular cloning and expression of human liver bile acid CoA:amino acid N-acyltransferase. J Biol Chem. 1994 Jul 29;269(30):19375-9.[8034703 ]
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  3. Johnson MR, Barnes S, Kwakye JB, Diasio RB: Purification and characterization of bile acid-CoA:amino acid N-acyltransferase from human liver. J Biol Chem. 1991 Jun 5;266(16):10227-33.[2037576 ]
  4. Sfakianos MK, Wilson L, Sakalian M, Falany CN, Barnes S: Conserved residues in the putative catalytic triad of human bile acid Coenzyme A:amino acid N-acyltransferase. J Biol Chem. 2002 Dec 6;277(49):47270-5. Epub 2002 Sep 17.[12239217 ]
  5. O'Byrne J, Hunt MC, Rai DK, Saeki M, Alexson SE: The human bile acid-CoA:amino acid N-acyltransferase functions in the conjugation of fatty acids to glycine. J Biol Chem. 2003 Sep 5;278(36):34237-44. Epub 2003 Jun 16.[12810727 ]
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  7. Carlton VE, Harris BZ, Puffenberger EG, Batta AK, Knisely AS, Robinson DL, Strauss KA, Shneider BL, Lim WA, Salen G, Morton DH, Bull LN: Complex inheritance of familial hypercholanemia with associated mutations in TJP2 and BAAT. Nat Genet. 2003 May;34(1):91-6.[12704386 ]
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