alcohol dehydrogenase/dental caries

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Effects of cavities at the nicotinamide binding site of liver alcohol dehydrogenase on structure, dynamics and catalysis.

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A role for protein dynamics in enzymatic catalysis of hydrogen transfer has received substantial scientific support, but the connections between protein structure and catalysis remain to be established. Valine residues 203 and 207 are at the binding site for the nicotinamide ring of the coenzyme in

Alcohol dehydrogenase 3 genotype is not associated with risk of squamous cell carcinoma of the oral cavity and pharynx.

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Alcohol is one of the major risk factors for oral and pharyngeal cancer. The rate-limiting step in alcohol metabolism is the oxidation (activation) of ethanol to acetaldehyde by the alcohol dehydrogenases (ADHs). It has been hypothesized that individuals who are homozygous for the fast allele

Alcohol dehydrogenase 3 genotype and risk of oral cavity and pharyngeal cancers.

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BACKGROUND The consumption of alcoholic beverages is a strong risk factor for cancers of the oral cavity and pharynx (oral cancers). Alcohol dehydrogenase type 3 (ADH3) metabolizes ethanol to acetaldehyde, a carcinogen. We evaluated whether individuals homozygous for the fast-metabolizing ADH3(1)

Re: Alcohol dehydrogenase 3 genotype and risk of oral cavity and pharyngeal cancers.

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The coordination of the catalytic zinc in alcohol dehydrogenase studied by combined quantum-chemical and molecular mechanics calculations.

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The coordination number of the catalytic zinc ion in alcohol dehydrogenase has been studied by integrated ab initio quantum-chemical and molecular mechanics geometry optimisations involving the whole enzyme. A four-coordinate active-site zinc ion is 100-200 kJ/mol more stable than a five-coordinate

Molecular dynamics simulations of alcohol dehydrogenase with a four- or five-coordinate catalytic zinc ion.

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A detailed parameterization is presented of a zinc ion with one histidine and two cysteinate ligands, together with one or two water, hydroxide, aldehyde, alcohol, or alkoxide ligands. The parameterization is tailored for the active site of alcohol dehydrogenase and is obtained entirely from quantum

The mechanisms underlying the effect of alpha-cyclodextrin on the aggregation and stability of alcohol dehydrogenase.

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High concentrations of proteins and enzymes have to be stored for extended periods of time. Under such conditions, at least three major factors contribute to aggregation and loss of protein function: hydrophobicity, propensity to form non-native beta-sheet structure and net charge of the polypeptide

Structure at 1.9 A resolution of a quinohemoprotein alcohol dehydrogenase from Pseudomonas putida HK5.

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The type II quinohemoprotein alcohol dehydrogenase of Pseudomonas putida is a periplasmic enzyme that oxidizes substrate alcohols to the aldehyde and transfers electrons first to pyrroloquinoline quinone (PQQ) and then to an internal heme group. The 1.9 A resolution crystal structure reveals that

Construction and characterization of an effector strain of Streptococcus mutans for replacement therapy of dental caries.

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An effector strain has been constructed for use in the replacement therapy of dental caries. Recombinant DNA methods were used to make the Streptococcus mutans supercolonizing strain, JH1140, lactate dehydrogenase deficient by deleting virtually all of the ldh open reading frame (ORF). To compensate

The refined crystal structure of Drosophila lebanonensis alcohol dehydrogenase at 1.9 A resolution.

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Drosophila alcohol dehydrogenase (DADH; EC 1.1.1.1) is a NAD(H)-dependent oxidoreductase belonging to the short-chain dehydrogenases/reductases (SDR) family. This homodimeric enzyme catalyzes the dehydrogenation of alcohols to their respective ketones or aldehydes in the fruit-fly Drosophila, both

Involvement of the C-terminal tail in the activity of Drosophila alcohol dehydrogenase. Evaluation of truncated proteins constructed by site-directed mutagenesis.

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Drosophila alcohol dehydrogenase belongs to the heterogeneous family of short-chain dehydrogenases/reductases, which does not include the well characterized mammalian alcohol dehydrogenases. Although it is clear that the main biological role of this enzyme is in alcohol oxidation, in the absence of

Relaxation of nonproductive binding and increased rate of coenzyme release in an alcohol dehydrogenase increases turnover with a nonpreferred alcohol enantiomer.

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Alcohol dehydrogenase A (ADH-A) from Rhodococcus ruber DSM 44541 is a promising biocatalyst for redox transformations of arylsubstituted sec-alcohols and ketones. The enzyme is stereoselective in the oxidation of 1-phenylethanol with a 300-fold preference for the (S)-enantiomer. The low catalytic

Alcohol dehydrogenase 3 and risk of squamous cell carcinomas of the head and neck.

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In order to examine the association between alcohol dehydrogenase 3 (ADH3) genotypes and risk of head and neck squamous cell carcinomas (HNSCC), we conducted a hospital based case-control study including 348 cases and 330 controls. DNA isolated from exfoliated cells from the oral cavity were

Risk of head and neck cancer and the alcohol dehydrogenase 3 genotype.

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Squamous cell carcinoma of the head and neck (SCCHN), including the oral cavity, pharynx and larynx, is an excellent tumor model to evaluate gene-environment interactions, including alcohol and alcohol-metabolizing enzymes such as alcohol dehydrogenase (ADH). We conducted a hospital-based

Alcohol dehydrogenase 3 genotype as a risk factor for upper aerodigestive tract cancers.

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OBJECTIVE To assess alcohol dehydrogenase 3 (ADH3) polymorphism at position Ile349Val as indicator of risk factor for upper aerodigestive tract (UADT) cancer to verify its association with UADT cancer in nonalcoholic or nonsmoking individuals. METHODS Cross-sectional study. METHODS Primary care or

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