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20-September-2008 09:29:09 - Nucleotide Redirected from Deoxynucleotides This article or section includes a list of references or external links, but its sources remain unclear because it lacks in-text citations. You can improve this article by introducing more precise citations where appropriate. February 2008 Nucleotides are organic compounds that consist of three joined structures: a nitrogenous base, a sugar, and a phosphate group. The most common nucleotides can be divided into two groups purines and pyrimidines based on the structure of the nitrogenous base. The joined sugar is either ribose or deoxyribose. Nucleotides are the structural units of RNA and DNA. They also serve as important cofactors in cellular signaling and metabolism. These cofactors include CoA, flavin adenine dinucleotide, flavin mononucleotide, adenosine triphosphate and nicotinamide adenine dinucleotide phosphate. Contents 1 Nucleotide synthesis and structure 2 Synthesis 3 Types of bases 3.1 Pyrimidine ribonucleotides 3.2 Purine ribonucleotides 4 See also 5 External links Nucleotide synthesis and structure The structure elements of the most common nucleotides The structure elements of the most common nucleotides A nucleotide is composed of a ring of nitrogen, carbon and oxygen atoms, a five carbon sugar together referred to as a nucleoside and one phosphate group. Nucleotides can be synthesized through a variety of methods both in vitro and in vivo. This can involve salvage synthesis the re-use of parts of nucleotides in resynthesizing new nucleotides through breakdown and synthesis reactions in order to exchange useful parts, or the use of protecting groups in a laboratory. In the latter case, a purified nucleoside or nucleobase is protected to create a phosphoramidite, and can be used to obtain analogues not present in nature and/or to create an oligonucleotide. The first step of nucleotide synthesis is the formation of a nucleoside the nitrogenous base joined to a sugar. The sugar involved in the synthesis and structure of a nucleotide may be either ribose or deoxyribose; in the latter case, the prefix 'deoxy' may be added before the name of the nucleoside in all cases except Uracil. A functional group of phosphate is then esterified to the sugar, creating a nucleotide. The phosphate group may consist of one, two, or three phosphates, forming monophosphates, diphosphates, or triphosphates, respectively. Synthesis Nucleotides can be synthesized through a variety of methods both in vitro and in vivo. This can involve salvage synthesis the re-use of parts of nucleotides in resynthesizing new nucleotides through breakdown and synthesis reactions in order to exchange useful parts, or the use of protecting groups in a laboratory. In the latter case, a purified nucleoside or nucleobase is protected to create a phosphoramidite, and can be used to obtain analogues not present in nature and/or to create an oligonucleotide. Types of bases Nucleotides can be synthesized with both purine and pyrimidine as bases. In DNA, the purine bases are adenine and guanine, while the pyrimidines are thymine and cytosine. RNA uses uracil rather than thymine thymine is produced by adding a methyl to uracil. The nucleotide passes through numerous biochemical steps while being processed, adding and removing atoms through the use of numerous enzymes. Pyrimidine ribonucleotides The synthesis of UMP.The color scheme is as follows: enzymes, coenzymes, substrate names, inorganic molecules The synthesis of UMP. The color scheme is as follows: enzymes, coenzymes, substrate names, inorganic molecules The synthesis of a single pyrimidine is complex; the diagram to the left demonstrates the synthesis of a single pyrimidine. Purine ribonucleotides The atoms which are used to build the purine nucleotides come from a variety of sources: Image:Nucleotides syn3.png 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 The synthesis of IMP.The color scheme is as follows: enzymes, coenzymes, substrate names, metal ions, inorganic molecules The synthesis of IMP. The color scheme is as follows: enzymes, coenzymes, substrate names, metal ions, inorganic molecules 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: GART reactions 2, 3, and 5 PAICS reactions 6, and 7 ATIC reactions 9, and 10 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. See also Chromosome Gene Genetics Nucleic acid analogues External links Abbreviations and Symbols for Nucleic Acids, Polynucleotides and their Constituents IUPAC Provisional Recommendations 2004 IUPAC Chemistry explanation of nucleotide structure v d e Nucleobases, nucleosides, and nucleotides Nucleobases Purine Adenine, Guanine | Pyrimidine Uracil, Thymine, Cytosine Nucleosides/ NB+pentose Ribonucleosides Adenosine | Guanosine | Uridine | Cytidine Deoxyribonucleosides Deoxyadenosine | Deoxyguanosine | Thymidine | Deoxyuridine | Deoxycytidine Nucleotides/ NS+phosphate Ribonucleotide monophosphates AMP, GMP, UMP, CMP | diphosphates ADP, GDP, UDP, CDP | triphosphates ATP, GTP, UTP, CTP Deoxyribonucleotides monophosphates dAMP, dGMP, dUMP, TMP, dCMP | diphosphates dADP, dGDP, TDP, dCDP | triphosphates dATP, dGTP, TTP, dCTP Cyclic cAMP, cGMP, c-di-GMP, cADPR Major families of biochemicals Saccharides | Carbohydrates | Glycosides | | Amino acids | Peptides | Proteins | Glycoproteins | | Lipids | Terpenes | Steroids | Carotenoids Alkaloids | Nucleobases | Nucleic acids | | Enzyme cofactors | Flavonoids | Polyketides | Tetrapyrroles Retrieved from http://en..org/wiki/Nucleotide Categories: Nucleic acids | Nucleotides | GeneticsHidden category: Articles lacking in-text citations Views Article Discussion this page History Personal tools Log in / create account Navigation Main page Contents Featured content Current events Random article Search Go Search Interaction Community portal Recent changes Contact Donate to Help Toolbox What links here Related changes Upload file Special pages Printable version Permanent link Cite this page Languages العربية Bân-lâm-gú Bosanski БългарÑ?ки Català Česky Dansk Deutsch Ελληνικά Español Esperanto Ù?ارسی Français Galego í•œêµì–´ Bahasa Indonesia Italiano עברית ქáƒ?რთული Lëtzebuergesch Lietuvių Magyar МакедонÑ?ки Bahasa Melayu Nederlands 日本語 ‪Norsk bokmÃ¥l‬ Occitan Polski Português Română РуÑ?Ñ?кий Shqip Simple English SlovenÄ?ina SlovenÅ¡Ä?ina СрпÑ?ки / Srpski Suomi Svenska ไทย Tiếng Việt Türkçe УкраїнÑ?ька اردو ä¸æ–‡ This page was last modified on 20 June 2008, at 00:1
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