Information about Nucleotide
A nucleotide is a chemical compound that consists of 3 portions: a heterocyclic base, a sugar, and one or more phosphate groups. In the most common nucleotides the base is a derivative of purine or pyrimidine, and the sugar is the pentose (five-carbon sugar) deoxyribose or ribose. Nucleotides are the monomers of nucleic acids, with three or more bonding together in order to form a nucleic acid.
Nucleotides are the structural units of RNA, DNA, and several cofactors - CoA, flavin adenine dinucleotide, flavin mononucleotide, adenosine triphosphate and nicotinamide adenine dinucleotide phosphate. In the cell they have important roles in metabolism and signaling.
The de novo synthesis of purine nucleotides by which these precursors are incorporated into the purine ring, proceeds by a 10 step pathway to the branch point intermediate IMP, the nucleotide of the base hypoxanthine. AMP and GMP are subsequently synthesized from this intermediate via separate, two step each, pathways. Thus purine moieties are initially formed as part of the ribonucleotides rather than as free bases.
Six enzymes take part in IMP synthesis. Three of them are multifunctional: Reaction 1. The pathway starts with the formation of PRPP. PRPS1 is the enzyme that activates R5P, which is primarily formed by the pentose phosphate pathway, to PRPP by reacting it with ATP. The reaction is unusual in that a pyrophosphoryl group is directly transferred from ATP to C1 of R5P and that the product has the α configuration about C1. This reaction is also shared with the pathways for the synthesis of the pyrimidine nucleotides, Trp, and His. As a result of being on (a) such (a) major metabolic crossroad and the use of energy, this reaction is highly regulated.
Reaction 2. In the first reaction unique to purine nucleotide biosynthesis, PPAT catalyzes the displacement of PRPP's pyrophosphate group (PPi) by Gln's amide nitrogen. The reaction occurs with the inversion of configuration about ribose C1, thereby forming β-5-phosphorybosylamine (5-PRA) and establishing the anomeric form of the future nucleotide. This reaction which is driven to completion by the subsequent hydrolysis of the released PPi, is the pathway's flux generating step and is therefore regulated too.
Reaction 3.
Nucleotides are the structural units of RNA, DNA, and several cofactors - CoA, flavin adenine dinucleotide, flavin mononucleotide, adenosine triphosphate and nicotinamide adenine dinucleotide phosphate. In the cell they have important roles in metabolism and signaling.
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The structure elements of the most common nucleotides
Nucleotides
) Chemical structure of adenosine monophosphate Adenosine monophosphate AMP | ) Chemical structure of adenosine diphosphate Adenosine diphosphate ADP | ) Chemical structure of adenosine triphosphate Adenosine triphosphate ATP |
) Chemical structure of guanosine monophosphate Guanosine monophosphate GMP | ) Chemical structure of guanosine diphosphate Guanosine diphosphate GDP | ) Chemical structure of guanosine triphosphate Guanosine triphosphate GTP |
) Chemical structure of thymidine monophosphate Thymidine monophosphate TMP | ) Chemical structure of thymidine diphosphate Thymidine diphosphate TDP | ) Chemical structure of thymidine triphosphate Thymidine triphosphate TTP |
) Chemical structure of uridine monophosphate Uridine monophosphate UMP | ) Chemical structure of uridine diphosphate Uridine diphosphate UDP | ) Chemical structure of uridine triphosphate Uridine triphosphate UTP |
) Chemical structure of cytidine monophosphate Cytidine monophosphate CMP | ) Chemical structure of cytidine diphosphate Cytidine diphosphate CDP | ) Chemical structure of cytidine triphosphate Cytidine triphosphate CTP |
Deoxynucleotides
) Chemical structure of deoxyadenosine monophosphate Deoxyadenosine monophosphate dAMP | ) Chemical structure of deoxyadenosine diphosphate Deoxyadenosine diphosphate dADP | ) Chemical structure of deoxyadenosine triphosphate Deoxyadenosine triphosphate dATP |
) Chemical structure of deoxyguanosine monophosphate Deoxyguanosine monophosphate dGMP | ) Chemical structure of deoxyguanosine diphosphate Deoxyguanosine diphosphate dGDP | ) Chemical structure of deoxyguanosine triphosphate Deoxyguanosine triphosphate dGTP |
) Chemical structure of deoxythymidine monophosphate Deoxythymidine monophosphate dTMP | ) Chemical structure of deoxythymidine diphosphate Deoxythymidine diphosphate dTDP | ) Chemical structure of deoxythymidine triphosphate Deoxythymidine triphosphate dTTP |
) Chemical structure of deoxyuridine monophosphate Deoxyuridine monophosphate dUMP | ) Chemical structure of deoxyuridine diphosphate Deoxyuridine diphosphate dUDP | ) Chemical structure of deoxyuridine triphosphate Deoxyuridine triphosphate dUTP |
) Chemical structure of deoxycytidine monophosphate Deoxycytidine monophosphate dCMP | ) Chemical structure of deoxycytidine diphosphate Deoxycytidine diphosphate dCDP | ) Chemical structure of deoxycytidine triphosphate Deoxycytidine triphosphate dCTP |
Synthesis
Salvage synthesis refers to the reuse of parts of nucleotides in resynthesizing new nucleotides. Salvage synthesis requires both breakdown and synthesis reactions in order to exchange the useful parts.Natural
Purine ribonucleotides
By using a variety of isotopically labeled compounds it was demonstrated that the sources of the atoms in purines are as follows:) | The biosynthetic origins of purine ring atoms N1 arises from the amine group of Asp C2 and C8 originate from formate N3 and N9 are contributed by the amide group of Gln C4, C5 and N7 are derived from Gly C6 comes from HCO3- (CO2) |
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The synthesis of IMP.
The color scheme is as follows: enzymes, coenzymes, substrate names, metal ions, inorganic molecules Six enzymes take part in IMP synthesis. Three of them are multifunctional: Reaction 1. The pathway starts with the formation of PRPP. PRPS1 is the enzyme that activates R5P, which is primarily formed by the pentose phosphate pathway, to PRPP by reacting it with ATP. The reaction is unusual in that a pyrophosphoryl group is directly transferred from ATP to C1 of R5P and that the product has the α configuration about C1. This reaction is also shared with the pathways for the synthesis of the pyrimidine nucleotides, Trp, and His. As a result of being on (a) such (a) major metabolic crossroad and the use of energy, this reaction is highly regulated.
Reaction 2. In the first reaction unique to purine nucleotide biosynthesis, PPAT catalyzes the displacement of PRPP's pyrophosphate group (PPi) by Gln's amide nitrogen. The reaction occurs with the inversion of configuration about ribose C1, thereby forming β-5-phosphorybosylamine (5-PRA) and establishing the anomeric form of the future nucleotide. This reaction which is driven to completion by the subsequent hydrolysis of the released PPi, is the pathway's flux generating step and is therefore regulated too.
Reaction 3.
Pyrimidine ribonucleotides
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The synthesis of UMP.
The color scheme is as follows: enzymes, coenzymes, substrate names, inorganic molecules See also
External links
- Abbreviations and Symbols for Nucleic Acids, Polynucleotides and their Constituents (IUPAC)
- Provisional Recommendations 2004 (IUPAC)
- Chemistry explanation of nucleotide structure
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Basic aromatic rings are aromatic rings in which the lone pair of electrons of a ring-nitrogen atom is not part of the aromatic system and extends in the plane of the ring.
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Sugars, brown
Nutritional value per 100 g (3.5 oz)
Energy 0 kcal 0 kJ
Carbohydrates 97.33 g
- Sugars 96.21 g
- Dietary fiber 0 g
Fat 0 g
Protein 0 g
Water 1.77 g
Thiamin (Vit. B1) 0.
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Nutritional value per 100 g (3.5 oz)
Energy 0 kcal 0 kJ
Carbohydrates 97.33 g
- Sugars 96.21 g
- Dietary fiber 0 g
Fat 0 g
Protein 0 g
Water 1.77 g
Thiamin (Vit. B1) 0.
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A phosphate, in inorganic chemistry, is a salt of phosphoric acid. In organic chemistry, a phosphate, or organophosphate, is an ester of phosphoric acid. Phosphates are important in biochemistry and biogeochemistry.
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In organic chemistry, functional groups (or moieties) are specific groups of atoms within molecules, that are responsible for the characteristic chemical reactions of those molecules.
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Purine (1) is a heterocyclic aromatic organic compound, consisting of a pyrimidine ring fused to an imidazole ring. Purines make up one of the two groups of nitrogenous bases. Pyrimidines make up the other group.
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Pyrimidine is a heterocyclic aromatic organic compound similar to benzene and pyridine, containing two nitrogen atoms at positions 1 and 3 of the six-member ring.[1] It is isomeric with two other forms of diazine.
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A pentose is a monosaccharide with five carbon atoms.
They either have an aldehyde functional group in position 1 (aldopentoses), or a ketone functional group in position 2 (ketopentoses).
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They either have an aldehyde functional group in position 1 (aldopentoses), or a ketone functional group in position 2 (ketopentoses).
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Deoxyribose, also known as D -Deoxyribose and 2-deoxyribose, is an aldopentose — a monosaccharide containing five carbon atoms, and including an aldehyde functional group.
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Ribose (ɹˈaɪbəʊs [1] , ɹˈaɪbəɹʊs [2] ), primarily seen as D -ribose, is an aldopentose — a monosaccharide containing five carbon atoms, and including an aldehyde functional group in its
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A monomer (from Greek mono "one" and meros "part") is a small molecule that may become chemically bonded to other monomers to form a polymer.
Examples of monomers are hydrocarbons such as the alkene and arene homologous series.
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Examples of monomers are hydrocarbons such as the alkene and arene homologous series.
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A nucleic acid is a macromolecule composed of nucleotide chains. In biochemistry these molecules carry genetic information or form structures within cells. The most common nucleic acids are deoxyribonucleic acid (DNA) and ribonucleic acid (RNA).
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Left: An RNA strand, with its nitrogenous bases. Right: Double-stranded DNA.]] Ribonucleic acid or RNA is a nucleic acid polymer consisting of nucleotide monomers, which plays several important roles in the processes of translating genetic information from
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Coenzyme A (CoA, CoASH, or HSCoA) is a coenzyme, notable for its role in the synthesis and oxidization of fatty acids, and the oxidation of pyruvate in the citric acid cycle. It is adapted from cysteamine, pantothenate, and adenosine triphosphate.
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In biochemistry, flavin adenine dinucleotide (FAD) is the precursor molecule to FADH2. Upon bonding to two hydrogen atoms, FAD is then changed to FADH2 and is turned into an energy-carrying molecule.
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Flavin mononucleotide (FMN), or riboflavin-5′-phosphate, is derived from riboflavin (vitamin B2) and functions as cofactor of various oxidoreductases including NADH dehydrogenase.
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Adenosine 5'-triphosphate (ATP) is a multifunctional nucleotide that is most important as a "molecular currency" of intracellular energy transfer. In this role, ATP transports chemical energy within cells for metabolism.
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Nicotinamide adenine dinucleotide phosphate (NADP) is used in anabolic reactions, such as fatty acid and nucleic acid synthesis, which require NADPH as a reducing agent.
NADPH is the reduced form of NADP+, and NADP+ is the oxidized form of NADPH.
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NADPH is the reduced form of NADP+, and NADP+ is the oxidized form of NADPH.
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Metabolism is the complete set of chemical reactions that occur in living cells. These processes are the basis of life, allowing cells to grow and reproduce, maintain their structures, and respond to their environments. Metabolism is usually divided into two categories.
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Adenosine monophosphate, also known as 5'-adenylic acid and abbreviated AMP, is a nucleotide that is found in RNA. It is an ester of phosphoric acid with the nucleoside adenosine.
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Adenosine diphosphate, abbreviated ADP, is a nucleotide. It is an ester of pyrophosphoric acid with the nucleotide adenine. ADP consists of the pyrophosphate group, the pentose sugar ribose, and the nucleobase adenine.
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Adenosine 5'-triphosphate (ATP) is a multifunctional nucleotide that is most important as a "molecular currency" of intracellular energy transfer. In this role, ATP transports chemical energy within cells for metabolism.
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Guanosine monophosphate, also known as 5'-guanidylic acid or guanylic acid and abbreviated GMP, is a nucleotide that is found in RNA. It is an ester of phosphoric acid with the nucleoside guanosine.
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Guanosine diphosphate, abbreviated GDP, is a nucleotide. It is an ester of pyrophosphoric acid with the nucleoside guanosine. GDP consists of the pyrophosphate group, the pentose sugar ribose, and the nucleobase guanine.
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Guanosine-5'-triphosphate (GTP) is a purine nucleotide. Its main role is as substrate for the synthesis of RNA during transcription. Its structure is similar to that of the guanine nucleotide, the only difference being that there are two extra phosphate groups added on.
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Thymidine monophosphate, also known as 5'-thymidylic acid and abbreviated TMP, is a nucleotide that is found in DNA. It is an ester of phosphoric acid with the nucleoside thymidine.
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Thymidine diphosphate, abbreviated TDP, is a nucleotide. It is an ester of pyrophosphoric acid with the nucleoside thymidine. TDP consists of the pyrophosphate group, the pentose sugar ribose, and the nucleobase thymine.
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Thymidine triphosphate or TTP is one of the four nucleoside triphosphates that are used in the in vivo synthesis of DNA.
It can be used by DNA ligase to create overlapping "sticky ends" so that protruding ends of opened microbial plasmids may be closed up.
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It can be used by DNA ligase to create overlapping "sticky ends" so that protruding ends of opened microbial plasmids may be closed up.
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