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Alcohol dehydrogenase

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Title: Alcohol dehydrogenase  
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Subject: Acetaldehyde, List of EC numbers (EC 1), List of enzymes, Alcohol, Alcoholic liver disease
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Alcohol dehydrogenase

alcohol dehydrogenase
Crystallographic structure of the
homodimer of human ADH5.[1]
EC number
CAS number 9031-72-5
IntEnz IntEnz view
ExPASy NiceZyme view
MetaCyc metabolic pathway
PRIAM profile
PDB structures RCSB PDB PDBe PDBsum
Gene Ontology AmiGO / EGO

Alcohol dehydrogenases (ADH) (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+.


  • Evolution 1
  • Discovery 2
  • Properties 3
  • Oxidation of alcohol 4
    • Mechanism of action in humans 4.1
      • Steps 4.1.1
      • Involved subunits 4.1.2
  • Active site 5
  • Structural zinc site 6
  • Types 7
    • Human 7.1
    • Yeast and bacteria 7.2
    • Plants 7.3
    • Iron-containing 7.4
    • Other types 7.5
  • Applications 8
  • Clinical significance 9
    • Alcoholism 9.1
    • Drug dependence 9.2
  • See also 10
  • References 11
  • External links 12


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.[2][3] 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.[2][3]

The ability to produce nitric oxide signaling.[4][5]

In humans, sequencing on 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.[6] 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.[6] 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.[7] In regions where rice was cultivated, rice was also fermented into ethanol.[7] The results of increased alcohol availability led to alcoholism and abuse by those able to acquire it, resulting in lower reproductive fitness.[7] Those with the variant allele have little tolerance for alcohol, thus lowering chance of dependence and abuse.[6][7] 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.[6] 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.[8]


Horse LADH (Liver Alcohol Dehydrogenase)

The first-ever isolated alcohol dehydrogenase (ADH) was purified in 1937 from Saccharomyces cerevisiae (baker's yeast).[9] Many aspects of the catalytic mechanism for the horse liver ADH enzyme were investigated by Hugo Theorell and coworkers.[10] ADH was also one of the first oligomeric enzymes that had its amino acid sequence and three-dimensional structure determined.[11][12][13]

In early 1960, it was discovered in fruit flies of the genus Drosophila.[14]


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.[14] In mammals this is a redox (reduction/oxidation) reaction involving the coenzyme nicotinamide adenine dinucleotide (NAD+).

Alcohol dehydrogenase is a dimer with a mass of 80 kDa.[15]

Oxidation of alcohol

Mechanism of action in humans


  1. Binding of the coenzyme NAD+
  2. Binding of the alcohol substrate by coordination to zinc
  3. Deprotonation of His-51
  4. Deprotonation of nicotinamide ribose
  5. Deprotonation of Thr-48
  6. Deprotonation of the alcohol
  7. Hydride transfer from the alkoxide ion to NAD+, leading to NADH and a zinc bound aldehyde or ketone
  8. Release of the product aldehyde.

The mechanism in yeast and bacteria is the reverse of this reaction. These steps are supported through kinetic studies.[15]

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.[15] 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+.[15]

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.[16]



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.[17] The enzyme is present at high levels in the liver and the lining of the stomach.[18] It catalyzes the oxidation of ethanol to acetaldehyde (ethanal):


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.[19]

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.[20][21]

alcohol dehydrogenase 1A,
α polypeptide
Symbol ADH1A
Alt. symbols ADH1
Entrez 124
HUGO 249
OMIM 103700
RefSeq NM_000667
UniProt P07327
Other data
EC number
Locus Chr. 4 q23
alcohol dehydrogenase 1B,
β polypeptide
Symbol ADH1B
Alt. symbols ADH2
Entrez 125
HUGO 250
OMIM 103720
RefSeq NM_000668
UniProt P00325
Other data
EC number
Locus Chr. 4 q23
alcohol dehydrogenase 1C,
γ polypeptide
Symbol ADH1C
Alt. symbols ADH3
Entrez 126
HUGO 251
OMIM 103730
RefSeq NM_000669
UniProt P00326
Other data
EC number
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 Zn2+. 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.[22] 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
Symbol ADH4
Entrez 127
HUGO 252
OMIM 103740
RefSeq NM_000670
UniProt P08319
Other data
EC number
Locus Chr. 4 q22
alcohol dehydrogenase 5
(class III), χ polypeptide
Symbol ADH5
Entrez 128
HUGO 253
OMIM 103710
RefSeq NM_000671
UniProt P11766
Other data
EC number
Locus Chr. 4 q23
alcohol dehydrogenase 6
(class V)
Symbol ADH6
Entrez 130
HUGO 255
OMIM 103735
RefSeq NM_000672
UniProt P28332
Other data
EC number
Locus Chr. 4 q23
alcohol dehydrogenase 7
(class IV), μ or σ polypeptide
Symbol ADH7
Entrez 131
HUGO 256
OMIM 600086
RefSeq NM_000673
UniProt P40394
Other data
EC number
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 CO2. The overall reaction can be seen below:

Glucose + 2 ADP + 2 Pi → 2 ethanol + 2 CO2 + 2 ATP + 2 H2O[23]
Alcohol Dehydrogenase

In yeast[24] 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.[25]


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.[26] 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.[27] 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.[28] Differences in the sequences of ADH in different species have been used to create phylogenies showing how closely related different species of plants are.[29] 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.[28]


Iron-containing alcohol dehydrogenase
bacillus stearothermophilus glycerol dehydrogenase complex with glycerol
Symbol Fe-ADH
Pfam PF00465
Pfam clan CL0224
InterPro IPR001670
SCOP 1jqa

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:

  • E. coli adhE,[34] an iron-dependent enzyme that harbours three different activities: alcohol dehydrogenase, acetaldehyde dehydrogenase (acetylating) EC and pyruvate-formate-lyase deactivase.
  • 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.


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.[37] 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.[38]

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 μA/cm2.[39]

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.[40] 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.[41]

Clinical significance


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.[42]

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.[43]

See also


This article incorporates text from the public domain Pfam and InterPro IPR001670

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External links

  • 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.
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