Carboxylesterase 1

Liver carboxylesterase 1 also known as carboxylesterase 1 (CES1, hCE-1 or CES1A1) is an enzyme that in humans is encoded by the CES1 gene.^[5][6] The protein is also historically known as serine esterase 1 (SES1), monocyte esterase and cholesterol ester hydrolase (CEH). Three transcript variants encoding three different isoforms have been found for this gene.^[6] The various protein products from isoform a, b and c range in size from 568, 567 and 566 amino acids long, respectively.

CES1
Available structures PDB Ortholog search: PDBe RCSB List of PDB id codes 1MX1, 1MX5, 1MX9, 1YA4, 1YA8, 1YAH, 1YAJ, 2DQY, 2DQZ, 2DR0, 2H7C, 2HRQ, 2HRR, 3K9B, 4AB1, 5A7F, 5A7H, 5A7G
Identifiers
Aliases	CES1, ACAT, CE-1, CEH, CES2, HMSE, HMSE1, PCE-1, REH, SES1, TGH, hCE-1, carboxylesterase 1
External IDs	OMIM: 114835; MGI: 2148202; HomoloGene: 35606; GeneCards: CES1; OMA:CES1 - orthologs
EC number	3.1.1.1
Gene location (Human) Chr. Chromosome 16 (human)[1] Band 16q12.2 Start 55,802,851 bp[1] End 55,833,337 bp[1]
Gene location (Mouse) Chr. Chromosome 8 (mouse)[2] Band 8|8 C5 Start 93,892,696 bp[2] End 93,924,466 bp[2]
RNA expression pattern Bgee Human Mouse (ortholog) Top expressed in right lobe of liver gallbladder right lung olfactory zone of nasal mucosa upper lobe of left lung smooth muscle tissue apex of heart muscle layer of sigmoid colon Descending thoracic aorta epithelium of colon Top expressed in white adipose tissue lacrimal gland gallbladder right lung lobe nasal epithelium tunica adventitia of aorta olfactory epithelium superior surface of tongue brown adipose tissue left lung More reference expression data BioGPS n/a
Gene ontology Molecular function methylumbelliferyl-acetate deacetylase activity carboxylic ester hydrolase activity hydrolase activity sterol esterase activity triglyceride lipase activity methyl indole-3-acetate esterase activity Cellular component endoplasmic reticulum lumen cytosol endoplasmic reticulum extracellular space Biological process xenobiotic metabolic process epithelial cell differentiation response to toxic substance cholesterol ester hydrolysis involved in cholesterol transport cholesterol biosynthetic process medium-chain fatty acid metabolic process lipid catabolic process angiotensin maturation Sources:Amigo / QuickGO
Orthologs Species Human Mouse Entrez 1066 104158 Ensembl ENSG00000198848 ENSG00000262243 ENSMUSG00000056973 UniProt P23141 Q8VCT4 RefSeq (mRNA) NM_001025194 NM_001025195 NM_001266 NM_053200 RefSeq (protein) NP_001020365 NP_001020366 NP_001257 NP_444430 Location (UCSC) Chr 16: 55.8 – 55.83 Mb Chr 8: 93.89 – 93.92 Mb PubMed search [3] [4]
Wikidata
View/Edit Human View/Edit Mouse

CES1 is present in most tissues with higher levels in the liver and low levels in the gastrointestinal tract.^[7]

Function

Carboxylesterase 1 is a serine esterase and member of a large multigene carboxylesterase family. It is also part of the alpha/beta fold hydrolase family.^[7] These enzymes are responsible for the hydrolysis of ester- and amide-bond-containing xenobiotics and drugs such as cocaine and heroin. They also hydrolyze long-chain fatty acid esters and thioesters. As part of phase II metabolism, the resulting carboxylates are then often conjugated by other enzymes to increase solubility and eventually excreted.

This enzyme is known to hydrolyze aromatic and aliphatic esters and can manage cellular cholesterol esterification levels. It may also play a role in detoxification in the lung and/or protection of the central nervous system from ester or amide compounds.^[6]

The protein contains an amino acid sequence at its N-terminus that sends it into the endoplasmic reticulum where a C-terminal sequence can bind to a KDEL receptor.^[7]

Clinical significance

Carboxylesterase 1 deficiency may be associated with non-Hodgkin lymphoma or B-cell lymphocytic leukemia. Inhibition of CES1 by in particular organophosphates reduces tumor-killing activity by monocytes.^[8][9] The loss of this protein in monocytes is one product of organophosphate poisoning.^[9]

CES1 can activate or deactivate various drugs. CES1 is responsible for the activation of many prodrugs such as angiotensin-converting enzyme (ACE) inhibitors, oseltamivir, and dabigatran.^{[10][11][12][13]} Genetic variants of CES1 can significantly affect both pharmacokinetics and pharmacodynamics of drugs metabolized by CES1, such as methylphenidate and clopidogrel.^[14] The ability of CES1 to metabolize heroin and cocaine among other drugs has suggested a therapeutic role for the enzyme.^[15]

Interactive pathway map

Click on genes, proteins and metabolites below to link to respective articles.[§ 1] [[File: [[ ]] [[ ]] [[ ]] [[ ]] [[ ]] [[ ]] [[ ]] [[ ]] [[ ]] [[ ]] [[ ]] [[ ]] [[ ]] [[ ]] [[ ]] [[ ]] [[ ]] [[ ]] [[ ]] [[ ]] [[ ]] [[ ]] [[ ]] [[ ]] [[ ]] [[ ]] [[ ]] [[ ]] [[ ]] [[ ]] [[ ]] [[ ]] [[ ]] [[ ]] [[ ]] [[ ]] [[ ]] [[ ]] [[ ]] [[ ]] [[ ]] [[ ]] [[ ]] [[ ]] [[ ]] [[ ]] [[ ]] |alt=Fluorouracil (5-FU) Activity edit]] Fluorouracil (5-FU) Activity edit The interactive pathway map can be edited at WikiPathways: "FluoropyrimidineActivity_WP1601".

Click on genes, proteins and metabolites below to link to respective articles. [§ 1] [[File: [[ ]] [[ ]] [[ ]] [[ ]] [[ ]] [[ ]] [[ ]] [[ ]] [[ ]] [[ ]] [[ ]] [[ ]] [[ ]] [[ ]] [[ ]] [[ ]] [[ ]] [[ ]] [[ ]] [[ ]] [[ ]] [[ ]] [[ ]] [[ ]] [[ ]] [[ ]] [[ ]] [[ ]] [[ ]] [[ ]] |alt=Irinotecan Pathway edit]] Irinotecan Pathway edit The interactive pathway map can be edited at WikiPathways: "IrinotecanPathway_WP229".