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Phosphodiester Linkages

Phosphodiester Linkages

Overview
Phosphodiester bond forms when a phosphoric acid molecule (H3PO4) links with two hydroxyl groups (–OH) of two other molecules, forming two ester bonds. Two water molecules are released in this process. The phosphodiester bond is commonly found in nucleic acids (DNA and RNA) and plays a critical role in their structure and function.
Phosphodiester Bonds Link Nucleotides Together
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Biosynthesis of Nucleic Acids

Biosynthesis of Nucleic Acids

Nucleic acid biosynthesis is a fundamental biochemical process that produces the purine and pyrimidine nucleotides essential for DNA and RNA synthesis. This pathway maintains a balanced nucleotide pool, preventing imbalances that could jeopardize genetic integrity and cellular function. Given the crucial role of nucleotides, their synthesis is tightly regulated to ensure proper cellular homeostasis.Purine BiosynthesisThe biosynthesis of purine nucleotides begins with ribose-5-phosphate, a...

Structure and Nomenclature of Thiols and Sulfides

Structure and Nomenclature of Thiols and Sulfides

Thiols and sulfides are sulfur analogs of alcohols and ethers, respectively, where the sulfur atom takes the place of the oxygen atom. Thus, thiols are generally represented as RSH, where R is an alkyl substituent and —SH is the functional group. On the other hand, in sulfides, the central sulfur atom is bonded to two hydrocarbon groups on either side. Depending upon the type of group, sulfides can be either symmetrical or asymmetrical. Both thiols and sulfides display a bent geometry, similar...

Preparation and Reactions of Sulfides

Preparation and Reactions of Sulfides

Sulfides are the sulfur analog of ethers, just as thiols are the sulfur analog of alcohol. Like ethers, sulfides also consist of two hydrocarbon groups bonded to the central sulfur atom. Depending upon the type of groups present, sulfides can be symmetrical or asymmetrical. Symmetrical sulfides can be prepared via an SN2 reaction between 2 equivalents of an alkyl halide and one equivalent of sodium sulfide.

Phosphoinositides and PIPs

Phosphoinositides and PIPs

Phosphoinositides are a group of phospholipids containing a glycerol backbone with two fatty acid chains and a phosphate attached to a myoinositol sugar ring. The inositol head group extends into the cytoplasm, where it is modified by adding phosphate groups to form phosphatidylinositol phosphates or PIPs.
Different phosphoinositides are synthesized and recruited on the cytosolic face of the plasma membrane. The localization of specific phosphoinositides concentrated in separate membrane...

Preparation and Reactions of Thiols

Preparation and Reactions of Thiols

Thiols are prepared using the hydrosulfide anion as a nucleophile in a nucleophilic substitution reaction with alkyl halides. For instance, bromobutane reacts with sodium hydrosulfide to give butanethiol.

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Nucleoside Triphosphates - From Synthesis to Biochemical Characterization

Nucleoside Triphosphates - From Synthesis to Biochemical Characterization

Published on: April 3, 2014

Dinucleotides containing 3'-S-phosphorothiolate linkages.

James W Gaynor¹, Richard Cosstick

¹Department of Chemistry, University of Liverpool, Liverpool, L69 7ZD, UK. jwgaynor@liv.ac.uk

Methods in Molecular Biology (Clifton, N.J.)

|July 13, 2011

Summary

This summary is machine-generated.

Researchers developed an efficient Michaelis-Arbuzov reaction for synthesizing thymidine dinucleotides with 3'-S-phosphorothiolate (3'-SP) linkages. This method utilizes a reactive silyl phosphite for improved synthesis and deprotection strategies.

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Area of Science:

Nucleic acid chemistry
Organic synthesis
Medicinal chemistry

Background:

The 3 -S-phosphorothiolate (3 -SP) linkage is a valuable phosphodiester analogue in nucleic acid derivatives.
3 -SP linkages offer achirality and enhanced resistance to nucleases.
Oligonucleotide synthesis typically employs phosphoramidite chemistry, but dinucleotide synthesis requires different approaches.

Purpose of the Study:

To describe an efficient method for synthesizing thymidine dinucleotides containing the 3 -SP linkage.
To utilize a Michaelis-Arbuzov reaction for dinucleotide synthesis.
To employ a silyl phosphite for enhanced reactivity and simplified deprotection.

Main Methods:

Michaelis-Arbuzov reaction between a nucleoside 5 -phosphite and a nucleoside 3 -S-disulphide.
Utilized a silyl phosphite intermediate for increased reactivity.
Developed a simplified deprotection strategy.

Main Results:

Successfully synthesized a thymidine dinucleotide with a 3 -SP linkage.
Demonstrated the efficiency of the Michaelis-Arbuzov reaction using silyl phosphites.
Provided detailed experimental procedures and spectroscopic data for intermediates and the final product.

Conclusions:

The described Michaelis-Arbuzov reaction provides an efficient route to 3 -SP thymidine dinucleotides.
The use of silyl phosphites offers advantages in reactivity and deprotection.
This method facilitates the preparation of modified nucleic acid analogues for potential therapeutic applications.