Alcohol dehydrogenase - wikipedia Alcohol dehydrogenase alcohol dehydrogenase Crystallographic structure of the homodimer of human ADH5. Identifiers EC number 1.1. 1.1 CAS number 9031 - 72 - 5 Databases IntEnz IntEnz view BRENDA BRENDA entry ExPASy NiceZyme view KEGG KEGG entry MetaCyc metabolic pathway PRIAM profile PDB structures RCSB PDB PDBe PDBsum Gene Ontology AmiGO / QuickGO Search PMC articles PubMed articles NCBI proteins Alcohol dehydrogenases ( ADH ) ( EC 1.1. 1.1 ) are a group of dehydrogenase enzymes that occur in many organisms and facilitate the interconversion between alcohols and aldehydes or ketones with the reduction of nicotinamide adenine dinucleotide ( NAD to NADH ). In humans and many other animals, they serve to break down alcohols that otherwise are toxic, and they also participate in generation of useful aldehyde, ketone, or alcohol groups during biosynthesis of various metabolites. In yeast, plants, and many bacteria, some alcohol dehydrogenases catalyze the opposite reaction as part of fermentation to ensure a constant supply of NAD. Contents 1 Evolution 2 Discovery 3 Properties 4 Oxidation of alcohol 4.1 Mechanism of action in humans 4.1. 1 Steps 4.1. 2 Involved subunits 5 Active site 6 Structural zinc site 7 Types 7.1 Human 7.2 Yeast and bacteria 7.3 Plants 7.4 Iron - containing 7.5 Other types 8 Applications 9 Clinical significance 9.1 Alcoholism 9.2 Drug dependence 9.3 Poisoning 10 See also 11 References 12 External links Evolution Genetic evidence from comparisons of multiple organisms showed that a glutathione - dependent formaldehyde dehydrogenase, identical to a class III alcohol dehydrogenase ( ADH - 3 / ADH5 ), is presumed to be the ancestral enzyme for the entire ADH family. Early on in evolution, an effective method for eliminating both endogenous and exogenous formaldehyde was important and this capacity has conserved the ancestral ADH - 3 through time. Gene duplication of ADH - 3, followed by series of mutations, the other ADHs evolved. The ability to produce ethanol from sugar ( which is the basis of how alcoholic beverages are made ) is believed to have initially evolved in yeast. Though this feature is not adaptive from an energy point of view, by making alcohol in such high concentrations so that they would be toxic to other organisms, yeast cells could effectively eliminate their competition. Since rotting fruit can contain more than 4 % of ethanol, animals eating the fruit needed a system to metabolize exogenous ethanol. This was thought to explain the conservation of ethanol active ADH in other species than yeast, though ADH - 3 is now known to also have a major role in nitric oxide signaling. In humans, sequencing of the ADH1B gene ( responsible for production of an alcohol dehydrogenase polypeptide ) shows two variants, in which there is an SNP ( single nucleotide polymorphism ) that leads to either a Histidine or an Arginine residue in the enzyme catalyzing the conversion of ethanol into acetaldehyde. In the Histidine variant, the enzyme is much more effective at the aforementioned conversion. The enzyme responsible for the conversion of acetaldehyde to acetate, however, remains unaffected, which leads to differential rates of substrate catalysis and causes a buildup of toxic acetaldehyde, causing cell damage. In humans, various haplotypes arising from this mutation are more concentrated in regions near Eastern China, a region also known for its low alcohol tolerance and dependence. A study was conducted in order to find a correlation between allelic distribution and alcoholism, and the results suggest that the allelic distribution arose along with rice cultivation in the region between 12,000 and 6,000 years ago. In regions where rice was cultivated, rice was also fermented into ethanol. The results of increased alcohol availability led to alcoholism and abuse by those able to acquire it, resulting in lower reproductive fitness. Those with the variant allele have little tolerance for alcohol, thus lowering chance of dependence and abuse. The hypothesis posits that those individuals with the His variant enzyme were sensitive enough to the effects of alcohol that differential reproductive success arose and the corresponding alleles were passed through the generations. Classical Darwinian evolution would act to select against the detrimental form of the enzyme ( Arg variant ) because of the lowered reproductive success of individuals carrying the allele. The result would be a higher frequency of the allele responsible for the His - variant enzyme in regions that had been under selective pressure the longest. The distribution and frequency of the His variant follows the spread of rice cultivation to inland regions of Asia, with higher frequencies of the His variant in regions that have cultivated rice the longest. The geographic distribution of the alleles seems to therefore be a result of natural selection against individuals with lower reproductive success, namely, those who carried the Arg variant allele and were more susceptible to alcoholism. Discovery Horse LADH ( Liver Alcohol Dehydrogenase ) The first - ever isolated alcohol dehydrogenase ( ADH ) was purified in 1937 from Saccharomyces cerevisiae ( brewer 's yeast ). Many aspects of the catalytic mechanism for the horse liver ADH enzyme were investigated by Hugo Theorell and coworkers. ADH was also one of the first oligomeric enzymes that had its amino acid sequence and three - dimensional structure determined. In early 1960, it was discovered in fruit flies of the genus Drosophila. Properties The alcohol dehydrogenases comprise a group of several isozymes that catalyse the oxidation of primary and secondary alcohols to aldehydes and ketones, respectively, and also can catalyse the reverse reaction. In mammals this is a redox ( reduction / oxidation ) reaction involving the coenzyme nicotinamide adenine dinucleotide ( NAD ). Oxidation of alcohol Mechanism of action in humans Steps Binding of the coenzyme NAD Binding of the alcohol substrate by coordination to zinc Deprotonation of His - 51 Deprotonation of nicotinamide ribose Deprotonation of Thr - 48 Deprotonation of the alcohol Hydride transfer from the alkoxide ion to NAD, leading to NADH and a zinc bound aldehyde or ketone Release of the product aldehyde. The mechanism in yeast and bacteria is the reverse of this reaction. These steps are supported through kinetic studies. Involved subunits The substrate is coordinated to the zinc and this enzyme has two zinc atoms per subunit. One is the active site, which is involved in catalysis. In the active site, the ligands are Cys - 46, Cys - 174, His - 67, and one water molecule. The other subunit is involved with structure. In this mechanism, the hydride from the alcohol goes to NAD. Crystal structures indicate that the His - 51 deprotonates the nicotinamide ribose, which deprotonates Ser - 48. Finally, Ser - 48 deprotonates the alcohol, making it an aldehyde. From a mechanistic perspective, if the enzyme adds hydride to the re face of NAD, the resulting hydrogen is incorporated into the pro-R position. Enzymes that add hydride to the re face are deemed Class A dehydrogenases. Active site The active site of alcohol dehydrogenase The active site of human ADH1 ( PDB : 1HSO ) consists of a zinc atom, His - 67, Cys - 174, Cys - 46, Thr - 48, His - 51, Ile - 269, Val - 292, Ala - 317, and Leu - 319. In the commonly studied horse liver isoform, Thr - 48 is a Ser, and Leu - 319 is a Phe. The zinc coordinates the substrate ( alcohol ). The zinc is coordinated by Cys - 46, Cys - 174, and His - 67. Leu - 319, Ala - 317, His - 51, Ile - 269 and Val - 292 stabilize NAD by forming hydrogen bonds. His - 51 and Ile - 269 form hydrogen bonds with the alcohols on nicotinamide ribose. Phe - 319, Ala - 317 and Val - 292 form hydrogen bonds with the amide on NAD. Structural zinc site The structural zinc binding motif in alcohol dehydrogenase from a MD simulation Mammalian alcohol dehydrogenases also have a structural zinc site. This Zn ion plays a structural role and is crucial for protein stability. The structures of the catalytic and structural zinc sites in horse liver alcohol dehydrogenase ( HLADH ) as revealed in crystallographic structures, which has been studied computationally with quantum chemical as well as with classical molecular dynamics methods. The structural zinc site is composed of four closely spaced cysteine ligands ( Cys97, Cys100, Cys103, and Cys111 in the amino acid sequence ) positioned in an almost symmetric tetrahedron around the Zn ion. A recent study showed that the interaction between zinc and cysteine is governed by primarily an electrostatic contribution with an additional covalent contribution to the binding. Types Human In humans, ADH exists in multiple forms as a dimer and is encoded by at least seven different genes. There are five classes ( I-V ) of alcohol dehydrogenase, but the hepatic form that is used primarily in humans is class 1. Class 1 consists of α, β, and γ subunits that are encoded by the genes ADH1A, ADH1B, and ADH1C. The enzyme is present at high levels in the liver and the lining of the stomach. It catalyzes the oxidation of ethanol to acetaldehyde ( ethanal ) : CH CH OH + NAD → CH CHO + NADH + H This allows the consumption of alcoholic beverages, but its evolutionary purpose is probably the breakdown of alcohols naturally contained in foods or produced by bacteria in the digestive tract. Another evolutionary purpose may be metabolism of the endogenous alcohol vitamin A ( retinol ), which generates the hormone retinoic acid, although the function here may be primarily the elimination of toxic levels of retinol. alcohol dehydrogenase 1A, α polypeptide Identifiers Symbol ADH1A Alt. symbols ADH1 Entrez 124 HUGO 249 OMIM 103700 RefSeq NM_000667 UniProt P07327 Other data EC number 1.1. 1.1 Locus Chr. 4 q23 alcohol dehydrogenase 1B, β polypeptide Identifiers Symbol ADH1B Alt. symbols ADH2 Entrez 125 HUGO 250 OMIM 103720 RefSeq NM_000668 UniProt P00325 Other data EC number 1.1. 1.1 Locus Chr. 4 q23 alcohol dehydrogenase 1C, γ polypeptide Identifiers Symbol ADH1C Alt. symbols ADH3 Entrez 126 HUGO 251 OMIM 103730 RefSeq NM_000669 UniProt P00326 Other data EC number 1.1. 1.1 Locus Chr. 4 q23 Alcohol dehydrogenase is also involved in the toxicity of other types of alcohol : For instance, it oxidizes methanol to produce formaldehyde and ethylene glycol to ultimately yield glycolic and oxalic acids. Humans have at least six slightly different alcohol dehydrogenases. Each is a dimer ( i.e., consists of two polypeptides ), with each dimer containing two zinc ions Zn. One of those ions is crucial for the operation of the enzyme : It is located at the catalytic site and holds the hydroxyl group of the alcohol in place. Alcohol dehydrogenase activity varies between men and women, between young and old, and among populations from different areas of the world. For example, young women are unable to process alcohol at the same rate as young men because they do not express the alcohol dehydrogenase as highly, although the inverse is true among the middle - aged. The level of activity may not be dependent only on level of expression but also on allelic diversity among the population. The human genes that encode class II, III, IV, and V alcohol dehydrogenases are ADH4, ADH5, ADH7, and ADH6, respectively. alcohol dehydrogenase 4 ( class II ), π polypeptide Identifiers Symbol ADH4 Entrez 127 HUGO 252 OMIM 103740 RefSeq NM_000670 UniProt P08319 Other data EC number 1.1. 1.1 Locus Chr. 4 q22 alcohol dehydrogenase 5 ( class III ), χ polypeptide Identifiers Symbol ADH5 Entrez 128 HUGO 253 OMIM 103710 RefSeq NM_000671 UniProt P11766 Other data EC number 1.1. 1.1 Locus Chr. 4 q23 alcohol dehydrogenase 6 ( class V ) Identifiers Symbol ADH6 Entrez 130 HUGO 255 OMIM 103735 RefSeq NM_000672 UniProt P28332 Other data EC number 1.1. 1.1 Locus Chr. 4 q23 alcohol dehydrogenase 7 ( class IV ), μ or σ polypeptide Identifiers Symbol ADH7 Entrez 131 HUGO 256 OMIM 600086 RefSeq NM_000673 UniProt P40394 Other data EC number 1.1. 1.1 Locus Chr. 4 q23 - q24 Yeast and bacteria Unlike humans, yeast and bacteria ( except lactic acid bacteria, and E. coli in certain conditions ) do not ferment glucose to lactate. Instead, they ferment it to ethanol and CO. The overall reaction can be seen below : Glucose + 2 ADP + 2 Pi → 2 ethanol + 2 CO + 2 ATP + 2 H O Alcohol Dehydrogenase In yeast and many bacteria, alcohol dehydrogenase plays an important part in fermentation : Pyruvate resulting from glycolysis is converted to acetaldehyde and carbon dioxide, and the acetaldehyde is then reduced to ethanol by an alcohol dehydrogenase called ADH1. The purpose of this latter step is the regeneration of NAD, so that the energy - generating glycolysis can continue. Humans exploit this process to produce alcoholic beverages, by letting yeast ferment various fruits or grains. It is interesting to note that yeast can produce and consume their own alcohol. The main alcohol dehydrogenase in yeast is larger than the human one, consisting of four rather than just two subunits. It also contains zinc at its catalytic site. Together with the zinc - containing alcohol dehydrogenases of animals and humans, these enzymes from yeasts and many bacteria form the family of `` long - chain '' - alcohol dehydrogenases. Brewer 's yeast also has another alcohol dehydrogenase, ADH2, which evolved out of a duplicate version of the chromosome containing the ADH1 gene. ADH2 is used by the yeast to convert ethanol back into acetaldehyde, and it is expressed only when sugar concentration is low. Having these two enzymes allows yeast to produce alcohol when sugar is plentiful ( and this alcohol then kills off competing microbes ), and then continue with the oxidation of the alcohol once the sugar, and competition, is gone. Plants In plants, ADH catalyses the same reaction as in yeast and bacteria to ensure that there is a constant supply of NAD. Maize has two versions of ADH - ADH1 and ADH2, Arabidopsis thaliana contains only one ADH gene. The structure of Arabidopsis ADH is 47 % - conserved, relative to ADH from horse liver. Structurally and functionally important residues, such as the seven residues that provide ligands for the catalytic and noncatalytic zinc atoms, however, are conserved, suggesting that the enzymes have a similar structure. ADH is constitutively expressed at low levels in the roots of young plants grown on agar. If the roots lack oxygen, the expression of ADH increases significantly. Its expression is also increased in response to dehydration, to low temperatures, and to abscisic acid, and it plays an important role in fruit ripening, seedlings development, and pollen development. Differences in the sequences of ADH in different species have been used to create phylogenies showing how closely related different species of plants are. It is an ideal gene to use due to its convenient size ( 2 -- 3 kb in length with a ~ 1000 nucleotide coding sequence ) and low copy number. Iron - containing Iron - containing alcohol dehydrogenase bacillus stearothermophilus glycerol dehydrogenase complex with glycerol Identifiers Symbol Fe - ADH Pfam PF00465 Pfam clan CL0224 InterPro IPR001670 PROSITE PDOC00059 SCOP 1jqa SUPERFAMILY 1jqa Available protein structures : Pfam structures PDB RCSB PDB ; PDBe ; PDBj PDBsum structure summary A third family of alcohol dehydrogenases, unrelated to the above two, are iron - containing ones. They occur in bacteria and fungi. In comparison to enzymes the above families, these enzymes are oxygen - sensitive. Members of the iron - containing alcohol dehydrogenase family include : Saccharomyces cerevisiae alcohol dehydrogenase 4 ( gene ADH4 ) Zymomonas mobilis alcohol dehydrogenase 2 ( gene adhB ) Escherichia coli propanediol oxidoreductase EC 1.1. 1.77 ( gene fucO ), an enzyme involved in the metabolism of fucose and which also seems to contain ferrous ion ( s ). Clostridium acetobutylicum NADPH - and NADH - dependent butanol dehydrogenases EC 1.1. 1. - ( genes adh1, bdhA and bdhB ), enzymes that have activity using butanol and ethanol as substrates. E. coli adhE, an iron - dependent enzyme that harbours three different activities : alcohol dehydrogenase, acetaldehyde dehydrogenase ( acetylating ) EC 1.2. 1.10 and pyruvate - formate - lyase deactivase. Bacterial glycerol dehydrogenase EC 1.1. 1.6 ( gene gldA or dhaD ). Clostridium kluyveri NAD - dependent 4 - hydroxybutyrate dehydrogenase ( 4hbd ) EC 1.1. 1.61 Citrobacter freundii and Klebsiella pneumoniae 1, 3 - propanediol dehydrogenase EC 1.1. 1.202 ( gene dhaT ) Bacillus methanolicus NAD - dependent methanol dehydrogenase EC 1.1. 1.244 E. coli and Salmonella typhimurium ethanolamine utilization protein eutG. E. coli hypothetical protein yiaY. Other types A further class of alcohol dehydrogenases belongs to quinoenzymes and requires quinoid cofactors ( e.g., pyrroloquinoline quinone, PQQ ) as enzyme - bound electron acceptors. A typical example for this type of enzyme is methanol dehydrogenase of methylotrophic bacteria. Applications In biotransformation, alcohol dehydrogenases are often used for the synthesis of enantiomerically pure stereoisomers of chiral alcohols. Often, high chemo - and enantioselectivity can be achieved. One example is the alcohol dehydrogenase from Lactobacillus brevis ( LbADH ), which is described to be a versatile biocatalyst. The high chemospecificity has been confirmed also in the case of substrates presenting two potential redox sites. For instance cinnamaldehyde presents both aliphatic double bond and aldehyde function. Unlike conventional catalysts, alcohol dehydrogenases are able to selectively act only on the latter, yielding exclusively cinnamyl alcohol. In fuel cells, alcohol dehydrogenases can be used to catalyze the breakdown of fuel for an ethanol fuel cell. Scientists at Saint Louis University have used carbon - supported alcohol dehydrogenase with poly ( methylene green ) as an anode, with a nafion membrane, to achieve about 50 μ A / cm. In 1949, E. Racker defined one unit of alcohol dehydrogenase activity as the amount that causes a change in optical density of 0.001 per minute under the standard conditions of assay. Recently, the international definition of enzymatic unit ( E.U. ) has been more common : one unit of Alcohol Dehydrogenase will convert 1.0 μmole of ethanol to acetaldehyde per minute at pH 8.8 at 25 ° C. Clinical significance Alcoholism There have been studies showing that ADH may have an influence on the dependence on ethanol metabolism in alcoholics. Researchers have tentatively detected a few genes to be associated with alcoholism. If the variants of these genes encode slower metabolizing forms of ADH2 and ADH3, there is increased risk of alcoholism. The studies have found that mutations of ADH2 and ADH3 are related to alcoholism in Northeast Asian populations. However, research continues in order to identify the genes and their influence on alcoholism. Drug dependence Drug dependence is another problem associated with ADH, which researchers think might be linked to alcoholism. One particular study suggests that drug dependence has seven ADH genes associated with it. These results may lead to treatments that target these specific genes. However, more research is necessary. Poisoning Fomepizole, a drug that inhibits alcohol dehydrogenase, can be used in the setting of acute methanol or ethylene glycol toxicity. This prevents the conversion of methanol to its toxic metabolites, formic acid and formaldehyde. 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Jump up ^ Zucca P, Littarru M, Rescigno A, Sanjust E ( May 2009 ). `` Cofactor recycling for selective enzymatic biotransformation of cinnamaldehyde to cinnamyl alcohol ''. Bioscience, Biotechnology, and Biochemistry. 73 ( 5 ) : 1224 -- 6. doi : 10.1271 / bbb. 90025. PMID 19420690. Jump up ^ Moore CM, Minteer SD, Martin RS ( Feb 2005 ). `` Microchip - based ethanol / oxygen biofuel cell ''. Lab on a Chip. 5 ( 2 ) : 218 -- 25. doi : 10.1039 / b412719f. PMID 15672138. Jump up ^ Racker E ( 1950 ). `` Crystalline alcohol dehydrogenase from baker 's yeast ''. J. Biol. Chem. 184 ( 1 ) : 313 -- 9. PMID 15443900. Jump up ^ `` Enzymatic Assay of Alcohol Dehydrogenase ( EC 1.1. 1.1 ) ''. Sigma Aldrich. Retrieved 13 July 2015. Jump up ^ Sher KJ, Grekin ER, Williams NA ( 2005 ). `` The development of alcohol use disorders ''. Annual Review of Clinical Psychology. 1 : 493 -- 523. doi : 10.1146 / annurev. clinpsy. 1.102803. 144107. PMID 17716097. Jump up ^ Luo X, Kranzler HR, Zuo L, Wang S, Schork NJ, Gelernter J ( Feb 2007 ). `` Multiple ADH genes modulate risk for drug dependence in both African - and European - Americans ''. Human Molecular Genetics. 16 ( 4 ) : 380 -- 90. doi : 10.1093 / hmg / ddl460. PMC 1853246. PMID 17185388. Jump up ^ International Programme on Chemical Safety ( IPCS ) : Methanol ( PIM 335 ), ( 1 ), retrieved on March 1, 2008 Jump up ^ Velez LI, Shepherd G, Lee YC, Keyes DC ( September 2007 ). `` Ethylene glycol ingestion treated only with fomepizole '' ( PDF ). J Med Toxicol. 3 ( 3 ) : 125 -- 8. doi : 10.1007 / BF03160922. PMID 18072148. External links Wikimedia Commons has media related to Alcohol dehydrogenase. PDBsum has links to three - dimensional structures of various alcohol dehydrogenases contained in the Protein Data Bank ExPASy contains links to the alcohol dehydrogenase sequences in Swiss - Prot, to a Medline literature search about the enzyme, and to entries in other databases. Oxidoreductases : alcohol oxidoreductases ( EC 1.1 ) 1.1. 1 : NAD / NADP acceptor 3 - hydroxyacyl - CoA dehydrogenase 3 - hydroxybutyryl - CoA dehydrogenase Alcohol dehydrogenase Aldo - keto reductase 1A1 1B1 1B10 1C1 1C3 1C4 7A2 Aldose reductase Beta - Ketoacyl ACP reductase Carbohydrate dehydrogenases Carnitine dehydrogenase D - malate dehydrogenase ( decarboxylating ) DXP reductoisomerase Glucose - 6 - phosphate dehydrogenase Glycerol - 3 - phosphate dehydrogenase HMG - CoA reductase IMP dehydrogenase Isocitrate dehydrogenase Lactate dehydrogenase L - threonine dehydrogenase L - xylulose reductase Malate dehydrogenase Malate dehydrogenase ( decarboxylating ) Malate dehydrogenase ( NADP+ ) Malate dehydrogenase ( oxaloacetate - decarboxylating ) Malate dehydrogenase ( oxaloacetate - decarboxylating ) ( NADP+ ) Phosphogluconate dehydrogenase Sorbitol dehydrogenase Hydroxysteroid dehydrogenase : 3β 3β - HSD NSDHL 11β 11β - HSD1 11β - HSD2 17β 1.1. 2 : cytochrome acceptor D - lactate dehydrogenase ( cytochrome ) D - lactate dehydrogenase ( cytochrome c - 553 ) Mannitol dehydrogenase ( cytochrome ) 1.1. 3 : oxygen acceptor Glucose oxidase L - gulonolactone oxidase Xanthine oxidase 1.1. 4 : disulfide as acceptor Vitamin K epoxide reductase Vitamin - K - epoxide reductase ( warfarin - insensitive ) 1.1. 5 : quinone / similar acceptor Malate dehydrogenase ( quinone ) Quinoprotein glucose dehydrogenase 1.1. 99 : other acceptors Choline dehydrogenase L2HGDH Enzymes Activity Active site Binding site Catalytic triad Oxyanion hole Enzyme promiscuity Catalytically perfect enzyme Coenzyme Cofactor Enzyme catalysis Regulation Allosteric regulation Cooperativity Enzyme inhibitor Classification EC number Enzyme superfamily Enzyme family List of enzymes Kinetics Enzyme kinetics Eadie -- Hofstee diagram Hanes -- Woolf plot Lineweaver -- Burk plot Michaelis -- Menten kinetics Types EC1 Oxidoreductases ( list ) EC2 Transferases ( list ) EC3 Hydrolases ( list ) EC4 Lyases ( list ) EC5 Isomerases ( list ) EC6 Ligases ( list ) Molecular and Cellular Biology portal Retrieved from `` https://en.wikipedia.org/w/index.php?title=Alcohol_dehydrogenase&oldid=808027139 '' Categories : Genes on human chromosome 4 Protein families EC 1.1. 1 NADH - dependent enzymes Iron enzymes Zinc enzymes Alcohol and health Hidden categories : All articles with dead external links Articles with dead external links from June 2017 Articles with permanently dead external links CS1 maint : Untitled periodical Use dmy dates from July 2013 Protein pages needing a picture All articles with unsourced statements Articles with unsourced statements from August 2011 Talk Search Contents About Wikipedia Български Bosanski Català Čeština Dansk Deutsch Español Français 한국어 Bahasa Indonesia Italiano Македонски Nederlands 日本 語 Polski Português Русский Slovenčina Slovenščina Српски / srpski Srpskohrvatski / српскохрватски Suomi Svenska 中文 Edit links This page was last edited on 31 October 2017, at 12 : 51. 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Question: where is alcohol dehydrogenase found in the body
Answer: present at high levels in the liver and the lining of the stomach