Xylitol
D-Xylulose Reductase
Xylose
Sugar Alcohols
Sugar Alcohol Dehydrogenases
Chewing Gum
Sweetening Agents
Aldehyde Reductase
Candida tropicalis
Cariostatic Agents
Sorbitol
Galactitol
L-Iditol 2-Dehydrogenase
Kinetic and nuclear magnetic resonance studies of xylose metabolism by recombinant Zymomonas mobilis ZM4(pZB5). (1/206)
The specific rates of growth, substrate utilization, and ethanol production as well as yields of biomass and ethanol production on xylose for the recombinant Zymomonas mobilis ZM4(pZB5) were shown to be much less than those on glucose or glucose-xylose mixtures. Typical fermentations with ZM4(pZB5) growing on glucose-xylose mixtures followed two-phase growth kinetics with the initial uptakes of glucose and xylose being followed by slower growth and metabolic uncoupling on xylose after glucose depletion. The reductions in rates and yields from xylose metabolism were considered in the present investigation and may be due to a number of factors, including the following: (i) the increased metabolic burden from maintenance of plasmid-related functions, (ii) the production of by-products identified as xylitol, acetate, lactate, acetoin, and dihydroxyacetone by (13)C-nuclear magnetic resonance (NMR) spectroscopy and high-performance liquid chromatography, (iii) growth inhibition due to xylitol by the putative inhibitory compound xylitol phosphate, and (iv) the less energized state of ZM4(pZB5). In vivo (31)P-NMR studies have established that the levels of NTP and UDP sugars on xylose were less than those on glucose, and this energy limitation is likely to restrict the growth of the recombinant strain on xylose media. (+info)Fructose operon mutants of Spiroplasma citri. (2/206)
Fructose-negative mutants of Spiroplasma citri wild-type strain GII-3 were selected by two methods. The first method is based on the selection of spontaneous xylitol-resistant mutants, xylitol being a toxic fructose analogue. Five such mutants were obtained, but only one, xyl3, was unable to use fructose and had no phosphoenolpuryvate:fructose phosphotransferase system (fructose-PTS) activity. Amplification and sequencing of the fructose permease gene of mutant xyl3 revealed the presence of an adenylic insertion leading to a truncated permease. The second method is based on inactivation of fruA and/or fruK by homologous recombination involving one crossing-over between the chromosomal genes and inactivated genes carried by replicative plasmids. Fructose-negative mutants were obtained at a frequency of about 10%. Fructose-PTS activity and 1-phosphofructokinase activity were not detected in four representative mutants that were characterized (H31, H45, E38 and E53). In strain H31, Southern blot analysis and PCR showed that the result of homologous recombination was, as expected, the presence in the chromosome of two mutated fruA-fruK copies with the plasmid sequence in between. Only the mutated copy, under control of the fructose operon promoter, was transcribed. This work describes for the first time the use of two methods to obtain fructose-auxotrophic mutants of S. citri. The method involving homologous recombination is a general procedure for gene disruption in S. citri. (+info)Genes for ribitol and D-arabitol catabolism in Escherichia coli: their loci in C strains and absence in K-12 and B strains. (3/206)
Escherichia coli C strains can grow at the expense of the two natural pentitols ribitol and D-arabitol, sugar alcohols previously thought not to be utilized by E. coli. E. coli strains K-12 and B cannot utilize either compound. The genetic loci responsible for pentitol catabolism in E. coli C, designated rtl and atl, are separate and closely linked. Each lies between metG and his and is highly co-transducible with metG and with a P2 prophage attachment site. rtl and atl readily can be transduced into E. coli K-12 or B strains, in which they integrate at, or very near, their E. coli C location. Transduction also can be used to insert rtl and atl into certain E. coli K-12 F' plasmids. No recombination between E. coli C strains and either K-12 or B strains occurs within the rtl-atl genetic region after interstrain conjugations or transductions. No cryptic rtl or atl genes in K-12 or B strains can be detected by complementation, recombination, or mutagenesis. These results are consistent with the view that the rtl-atl portion of the E. coli C chromosome has no counterpart in E. coli K-12 or B and may have been obtained from an extrageneric source. Detailed biochemical and genetic comparisons of penitol utilization in E. coli and Klebsiella aerogenes are in progress. The ability to catabolize xylitol is conferred upon E. coli C strains by a mutation at or adjacent to the rtl locus, whereas in E. coli K-12 or B strains harboring rtl an additional mutation at a separate locus is required for xylitol utilization. (+info)The osmolyte xylitol reduces the salt concentration of airway surface liquid and may enhance bacterial killing. (4/206)
The thin layer of airway surface liquid (ASL) contains antimicrobial substances that kill the small numbers of bacteria that are constantly being deposited in the lungs. An increase in ASL salt concentration inhibits the activity of airway antimicrobial factors and may partially explain the pathogenesis of cystic fibrosis (CF). We tested the hypothesis that an osmolyte with a low transepithelial permeability may lower the ASL salt concentration, thereby enhancing innate immunity. We found that the five-carbon sugar xylitol has a low transepithelial permeability, is poorly metabolized by several bacteria, and can lower the ASL salt concentration in both CF and non-CF airway epithelia in vitro. Furthermore, in a double-blind, randomized, crossover study, xylitol sprayed for 4 days into each nostril of normal volunteers significantly decreased the number of nasal coagulase-negative Staphylococcus compared with saline control. Xylitol may be of value in decreasing ASL salt concentration and enhancing the innate antimicrobial defense at the airway surface. (+info)Fructose utilization and phytopathogenicity of Spiroplasma citri. (5/206)
Spiroplasma citri is a plant-pathogenic mollicute. Recently, the so-called nonphytopathogenic S. citri mutant GMT 553 was obtained by insertion of transposon Tn4001 into the first gene of the fructose operon. Additional fructose operon mutants were produced either by gene disruption or selection of spontaneous xylitol-resistant strains. The behavior of these spiroplasma mutants in the periwinkle plants has been studied. Plants infected via leafhoppers with the wild-type strain GII-3 began to show symptoms during the first week following the insect-transmission period, and the symptoms rapidly became severe. With the fructose operon mutants, symptoms appeared only during the fourth week and remained mild, except when reversion to a fructose+ phenotype occurred. In this case, the fructose+ revertants quickly overtook the fructose- mutants and the symptoms soon became severe. When mutant GMT 553 was complemented with the fructose operon genes that restore fructose utilization, severe pathogenicity, similar to that of the wild-type strain, was also restored. Finally, plants infected with the wild-type strain and grown at 23 degrees C instead of 30 degrees C showed late symptoms, but these rapidly became severe. These results are discussed in light of the role of fructose in plants. Fructose utilization by the spiroplasmas could impair sucrose loading into the sieve tubes by the companion cells and result in accumulation of carbohydrates in source leaves and depletion of carbon sources in sink tissues. (+info)Effect of xylitol on growth of Streptococcus pneumoniae in the presence of fructose and sorbitol. (6/206)
Xylitol is effective in preventing acute otitis media by inhibiting the growth of Streptococcus pneumoniae. To clarify this inhibition we used fructose, which is known to block similar growth inhibition observed in Streptococcus mutans. In addition, we evaluated the efficacy of sorbitol in inhibiting the growth of pneumococci, as sorbitol is widely used for indications similar to those for which xylitol is used. The addition of 5% xylitol to the growth medium resulted in marked growth inhibition, an effect which was totally eliminated in the presence of 1, 2.5, or 5% fructose but not in the presence of 1 or 5% glucose, 1% galactose, or 1% sucrose. This finding implies that xylitol-induced inhibition of pneumococcal growth is mediated via the fructose phosphotransferase system in a way similar to that in which mutans group streptococcal growth is inhibited. The addition of sorbitol at concentrations of 1, 2.5, or 5% to the growth medium did not affect the growth of pneumococci and neither inhibited nor enhanced the xylitol-induced growth impairment. Thus, it seems that xylitol is the only commercially used sugar substitute proven to have an antimicrobial effect on pneumococci. (+info)Membrane-bound sugar alcohol dehydrogenase in acetic acid bacteria catalyzes L-ribulose formation and NAD-dependent ribitol dehydrogenase is independent of the oxidative fermentation. (7/206)
To identify the enzyme responsible for pentitol oxidation by acetic acid bacteria, two different ribitol oxidizing enzymes, one in the cytosolic fraction of NAD(P)-dependent and the other in the membrane fraction of NAD(P)-independent enzymes, were examined with respect to oxidative fermentation. The cytoplasmic NAD-dependent ribitol dehydrogenase (EC 1.1.1.56) was crystallized from Gluconobacter suboxydans IFO 12528 and found to be an enzyme having 100 kDa of molecular mass and 5 s as the sedimentation constant, composed of four identical subunits of 25 kDa. The enzyme catalyzed a shuttle reversible oxidoreduction between ribitol and D-ribulose in the presence of NAD and NADH, respectively. Xylitol and L-arabitol were well oxidized by the enzyme with reaction rates comparable to ribitol oxidation. D-Ribulose, L-ribulose, and L-xylulose were well reduced by the enzyme in the presence of NADH as cosubstrates. The optimum pH of pentitol oxidation was found at alkaline pH such as 9.5-10.5 and ketopentose reduction was found at pH 6.0. NAD-Dependent ribitol dehydrogenase seemed to be specific to oxidoreduction between pentitols and ketopentoses and D-sorbitol and D-mannitol were not oxidized by this enzyme. However, no D-ribulose accumulation was observed outside the cells during the growth of the organism on ribitol. L-Ribulose was accumulated in the culture medium instead, as the direct oxidation product catalyzed by a membrane-bound NAD(P)-independent ribitol dehydrogenase. Thus, the physiological role of NAD-dependent ribitol dehydrogenase was accounted to catalyze ribitol oxidation to D-ribulose in cytoplasm, taking D-ribulose to the pentose phosphate pathway after being phosphorylated. L-Ribulose outside the cells would be incorporated into the cytoplasm in several ways when need for carbon and energy sources made it necessary to use L-ribulose for their survival. From a series of simple experiments, membrane-bound sugar alcohol dehydrogenase was concluded to be the enzyme responsible for L-ribulose production in oxidative fermentation by acetic acid bacteria. (+info)The effect of non-cariogenic sweeteners on the prevention of dental caries: a review of the evidence. (8/206)
The role of sugar substitutes such as xylitol and sorbitol in the prevention of dental caries has been investigated in several clinical studies. The purpose of this report is to review the current published evidence regarding the relationship between sugar substitutes and dental caries. A literature search was conducted using MEDLINE and EMBASE and included studies published from 1966 to 2001. Studies that included human subjects and were published in English were included in this review. A total of fourteen clinical studies were reviewed that evaluated the effect of sorbitol or xylitol or the combination of both sugar substitutes on the incidence of dental caries. Most of the reports were of studies conducted with children outside of the United States. These studies demonstrated a consistent decrease in dental caries, ranging from 30 to 60 percent, among subjects using sugar substitutes as compared to subjects in a control group. These caries rate reductions were observed in subjects using xylitol or sorbitol as the sugar substitute in chewing gum or toothpaste. The highest caries reductions were observed in subjects using xylitol. These findings suggest that the replacement of sucrose with sorbitol and xylitol may significantly decrease the incidence of dental caries. (+info)Xylitol is a type of sugar alcohol used as a sugar substitute in various food and dental products. It has a sweet taste similar to sugar but with fewer calories and less impact on blood sugar levels, making it a popular choice for people with diabetes or those looking to reduce their sugar intake. Xylitol is also known to have dental benefits, as it can help prevent tooth decay by reducing the amount of bacteria in the mouth that cause cavities.
Medically speaking, xylitol is classified as a carbohydrate and has a chemical formula of C5H12O5. It occurs naturally in some fruits and vegetables, but most commercial xylitol is produced from corn cobs or other plant materials through a process called hydrogenation. While generally considered safe for human consumption, it can have a laxative effect in large amounts and may be harmful to dogs, so it's important to keep it out of reach of pets.
D-Xylulose Reductase is an enzyme that catalyzes the reduction of D-xylulose to xylitol using NADPH as a cofactor. This enzyme plays a role in the pentose phosphate pathway, which is a metabolic pathway that supplies reducing energy to cells by maintaining the level of the coenzyme NADPH. D-Xylulose Reductase is also involved in the metabolism of xylose, a type of sugar found in some fruits and vegetables, and is therefore of interest in the development of processes for the conversion of xylose to xylitol, a sweetener used in various food and pharmaceutical applications.
Xylose is a type of sugar that is commonly found in plants and wood. In the context of medical definitions, xylose is often used in tests to assess the function of the small intestine. The most common test is called the "xylose absorption test," which measures the ability of the small intestine to absorb this sugar.
In this test, a patient is given a small amount of xylose to drink, and then several blood and/or urine samples are collected over the next few hours. The amount of xylose that appears in these samples is measured and used to determine how well the small intestine is absorbing nutrients.
Abnormal results on a xylose absorption test can indicate various gastrointestinal disorders, such as malabsorption syndromes, celiac disease, or bacterial overgrowth in the small intestine.
Sugar alcohols, also known as polyols, are carbohydrates that are chemically similar to sugar but have a different molecular structure. They occur naturally in some fruits and vegetables, but most sugar alcohols used in food products are manufactured.
The chemical structure of sugar alcohols contains a hydroxyl group (-OH) instead of a hydrogen and a ketone or aldehyde group, which makes them less sweet than sugar and have fewer calories. They are not completely absorbed by the body, so they do not cause a rapid increase in blood glucose levels, making them a popular sweetener for people with diabetes.
Common sugar alcohols used in food products include xylitol, sorbitol, mannitol, erythritol, and maltitol. They are often used as sweeteners in sugar-free and low-sugar foods such as candy, chewing gum, baked goods, and beverages.
However, consuming large amounts of sugar alcohols can cause digestive symptoms such as bloating, gas, and diarrhea, due to their partial absorption in the gut. Therefore, it is recommended to consume them in moderation.
Sugar alcohol dehydrogenases (SADHs) are a group of enzymes that catalyze the interconversion between sugar alcohols and sugars, which involves the gain or loss of a pair of electrons, typically in the form of NAD(P)+/NAD(P)H. These enzymes play a crucial role in the metabolism of sugar alcohols, which are commonly found in various plants and some microorganisms.
Sugar alcohols, also known as polyols, are reduced forms of sugars that contain one or more hydroxyl groups instead of aldehyde or ketone groups. Examples of sugar alcohols include sorbitol, mannitol, xylitol, and erythritol. SADHs can interconvert these sugar alcohols to their corresponding sugars through a redox reaction that involves the transfer of hydrogen atoms.
The reaction catalyzed by SADHs is typically represented as follows:
R-CH(OH)-CH2OH + NAD(P)+ ↔ R-CO-CH2OH + NAD(P)H + H+
where R represents a carbon chain, and CH(OH)-CH2OH and CO-CH2OH represent the sugar alcohol and sugar forms, respectively.
SADHs are widely distributed in nature and have been found in various organisms, including bacteria, fungi, plants, and animals. These enzymes have attracted significant interest in biotechnology due to their potential applications in the production of sugar alcohols and other value-added products. Additionally, SADHs have been studied as targets for developing novel antimicrobial agents, as inhibiting these enzymes can disrupt the metabolism of certain pathogens that rely on sugar alcohols for growth and survival.
Xylulose is a ketopentose, which is a type of sugar (monosaccharide) with five carbon atoms and a ketone functional group. It is a less common sugar compared to glucose or fructose. Xylulose can be found in small amounts in some fruits and vegetables, and it can also be produced in the human body during the metabolism of certain substances like xylitol, a sugar alcohol used as a sweetener. In the body, xylulose is converted into xylulose-5-phosphate, which plays a role in the pentose phosphate pathway, a metabolic route that generates reducing power (NADPH) for biosynthesis and provides precursors for nucleotide synthesis.
Ribitol is a sugar alcohol, specifically a pentitol, that is a reduced form of the pentose sugar ribose. It is found in some fruits and vegetables, and it can also be produced synthetically. In biochemistry, ribitol plays a role as a component of certain coenzymes and as a constituent of the structural polysaccharides in the cell walls of some bacteria. It has been used in research and medical applications, such as in the study of bacterial metabolism and in the development of potential drugs.
A pentose is a monosaccharide (simple sugar) that contains five carbon atoms. The name "pentose" comes from the Greek word "pente," meaning five, and "ose," meaning sugar. Pentoses play important roles in various biological processes, such as serving as building blocks for nucleic acids (DNA and RNA) and other biomolecules.
Some common pentoses include:
1. D-Ribose - A naturally occurring pentose found in ribonucleic acid (RNA), certain coenzymes, and energy-carrying molecules like adenosine triphosphate (ATP).
2. D-Deoxyribose - A pentose that lacks a hydroxyl (-OH) group on the 2' carbon atom, making it a key component of deoxyribonucleic acid (DNA).
3. Xylose - A naturally occurring pentose found in various plants and woody materials; it is used as a sweetener and food additive.
4. Arabinose - Another plant-derived pentose, arabinose can be found in various fruits, vegetables, and grains. It has potential applications in the production of biofuels and other bioproducts.
5. Lyxose - A less common pentose that can be found in some polysaccharides and glycoproteins.
Pentoses are typically less sweet than hexoses (six-carbon sugars) like glucose or fructose, but they still contribute to the overall sweetness of many foods and beverages.
Chewing gum is not a medical term, but rather a common consumer product. It is a type of soft, cohesive substance designed to be chewed without being swallowed. The basic ingredients of chewing gum include a gum base, sweeteners, flavorings, and softeners. The gum base gives it its chewy texture, while sweeteners provide the taste. Flavorings are added to give the gum its particular taste, such as mint, fruit, or bubblegum. Softeners are added to keep the gum from hardening over time.
While chewing gum is not a medical treatment or therapy, it does have some potential health benefits and drawbacks. Chewing sugar-free gum, for example, has been shown to increase saliva production, which can help neutralize acid in the mouth and reduce the risk of tooth decay. However, excessive gum chewing can lead to jaw pain or headaches in some individuals. It is also important to choose sugar-free gum, as sugary gum can contribute to tooth decay.
Sweetening agents are substances that are added to foods or drinks to give them a sweet taste. They can be natural, like sugar (sucrose), honey, and maple syrup, or artificial, like saccharin, aspartame, and sucralose. Artificial sweeteners are often used by people who want to reduce their calorie intake or control their blood sugar levels. However, it's important to note that some sweetening agents may have potential health concerns when consumed in large amounts.
Aldehyde reductase is an enzyme that belongs to the family of alcohol dehydrogenases. Its primary function is to catalyze the reduction of a wide variety of aldehydes into their corresponding alcohols, using NADPH as a cofactor. This enzyme plays a crucial role in the detoxification of aldehydes generated from various metabolic processes, such as lipid peroxidation and alcohol metabolism. It is widely distributed in different tissues, including the liver, kidney, and brain. In addition to its detoxifying function, aldehyde reductase has been implicated in several physiological and pathophysiological processes, such as neuroprotection, cancer, and diabetes.
'Candida tropicalis' is a species of yeast that can be found normally in certain environments, including the human body (such as the skin, mouth, and digestive system). However, it can also cause infections in people with weakened immune systems or underlying medical conditions. These infections can occur in various parts of the body, including the bloodstream, urinary tract, and skin.
Like other Candida species, C. tropicalis is a type of fungus that reproduces by budding, forming oval-shaped cells. It is often resistant to certain antifungal medications, which can make infections more difficult to treat. Proper diagnosis and treatment, usually with antifungal drugs, are essential for managing C. tropicalis infections.
Cariostatic agents are substances or medications that are used to prevent or inhibit the development and progression of dental caries, also known as tooth decay or cavities. These agents work by reducing the ability of bacteria in the mouth to produce acid, which can erode the enamel and dentin of the teeth and lead to cavities.
There are several types of cariostatic agents that are commonly used in dental care, including:
1. Fluorides: These are the most widely used and well-studied cariostatic agents. They work by promoting the remineralization of tooth enamel and making it more resistant to acid attacks. Fluoride can be found in toothpaste, mouthwashes, gels, varnishes, and fluoridated water supplies.
2. Antimicrobial agents: These substances work by reducing the population of bacteria in the mouth that contribute to tooth decay. Examples include chlorhexidine, triclosan, and xylitol.
3. Casein phosphopeptide-amorphous calcium phosphate (CPP-ACP): This is a complex protein that has been shown to help remineralize tooth enamel and reduce the risk of dental caries. It can be found in some toothpastes and mouthwashes.
4. Silver diamine fluoride: This is a topical fluoride compound that contains silver ions, which have antimicrobial properties. It has been shown to be effective in preventing and arresting dental caries, particularly in high-risk populations such as young children and older adults with dry mouth.
It's important to note that while cariostatic agents can help reduce the risk of tooth decay, they are not a substitute for good oral hygiene practices such as brushing twice a day, flossing daily, and visiting the dentist regularly.
Sorbitol is a type of sugar alcohol used as a sweetener in food and drinks, with about half the calories of table sugar. In a medical context, sorbitol is often used as a laxative to treat constipation, or as a sugar substitute for people with diabetes. It's also used as a bulk sweetener and humectant (a substance that helps retain moisture) in various pharmaceutical and cosmetic products.
When consumed in large amounts, sorbitol can have a laxative effect because it's not fully absorbed by the body and draws water into the intestines, which can lead to diarrhea. It's important for people with certain digestive disorders, such as irritable bowel syndrome or fructose intolerance, to avoid sorbitol and other sugar alcohols, as they can cause gastrointestinal symptoms like bloating, gas, and diarrhea.
Galactitol is not a medical term per se, but it is a term used in biochemistry and medicine. Galactitol, also known as dulcitol, is a sugar alcohol that is formed in the body when an enzyme called galactose-1-phosphate uridylyltransferase (GALT) is missing or not functioning properly.
This enzyme deficiency can lead to a genetic disorder called galactosemia, which affects the body's ability to metabolize the sugar galactose, found in milk and other dairy products. When an individual with galactosemia consumes foods containing galactose, the galactose cannot be properly broken down and converted into glucose for energy. Instead, it gets converted into galactitol, which can accumulate in various tissues of the body, including the eyes, kidneys, and nervous system.
The accumulation of galactitol can cause a range of symptoms, such as cataracts, developmental delays, speech problems, and mental impairment. Therefore, individuals with galactosemia must follow a strict diet that avoids foods containing galactose to prevent the buildup of galactitol and its associated health complications.
L-Iditol 2-Dehydrogenase is an enzyme that catalyzes the chemical reaction between L-iditol and NAD+ to produce L-sorbose and NADH + H+. This enzyme plays a role in the metabolism of sugars, specifically in the conversion of L-iditol to L-sorbose in various organisms, including bacteria and fungi. The reaction catalyzed by this enzyme is part of the polyol pathway, which is involved in the regulation of osmotic pressure and other cellular processes.
"Cola" is not a medical term. It is a type of flavored carbonated soft drink that originated in the United States. The term "cola" comes from the name of the kola nut, which contains caffeine and has been used as a flavoring ingredient in these drinks. There are many brands of cola, but the two most well-known are Coca-Cola and Pepsi-Cola.
Colas typically contain carbonated water, high fructose corn syrup or sugar, caramel color, phosphoric acid, natural flavors (including extracts of the kola nut), and sometimes caffeine. Some people may use the term "cola" to refer specifically to Coca-Cola or Pepsi-Cola, while others may use it as a generic term for any type of cola-flavored soft drink.
While colas are widely consumed around the world, they have been associated with certain health concerns due to their high sugar content and other ingredients. For example, excessive consumption of colas has been linked to obesity, tooth decay, and bone density loss. However, it's important to note that these risks can be mitigated by consuming colas in moderation and maintaining a balanced diet.
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