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Phosphate Buffer

Phosphate Buffer

The phosphate buffer system is a critical biological mechanism for maintaining pH stability in the body. This system operates primarily through two components: sodium dihydrogen phosphate (NaH2PO4), which acts as a weak acid, and sodium hydrogen phosphate (Na2HPO4), which serves as a weak base.
Sodium dihydrogen phosphate does not fully dissociate in neutral or acidic solutions. When a strong base, such as sodium hydroxide (NaOH), is introduced into the solution, sodium dihydrogen phosphate...

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...

ATP Driven Pumps II: P-type Pumps

ATP Driven Pumps II: P-type Pumps

The P-type pumps are a large family of integral membrane transporter ATPases. They are divided into five major types based on substrate specificity, from I to V.
A typical P-type pump has three cytosolic domains: nucleotide-binding (N), phosphorylation (P), and activator (A) domains. These domains are connected to the membrane-spanning helices by short amino acid segments. ATP hydrolysis and covalent phosphoenzyme intermediate formation are crucial parts of the catalytic cycle. At the highly...

Protein Kinases and Phosphatases

Protein Kinases and Phosphatases

Proteins undergo chemical modifications that trigger changes in the charge, structure, and conformation of the proteins. Phosphorylation, acetylation, glycosylation, nitrosylation, ubiquitination, lipidation, methylation, and proteolysis are various protein modifications that regulate protein activity. Such modifications are usually enzyme-driven.
Protein kinases
Many proteins in the cell are regulated by phosphorylation, the addition of a phosphate group. A family of enzymes called kinases...

Protein Kinases and Phosphatases

Protein Kinases and Phosphatases

Proteins undergo chemical modifications that trigger changes in the charge, structure, and conformation of the proteins. Phosphorylation, acetylation, glycosylation, nitrosylation, ubiquitination, lipidation, methylation, and proteolysis are various protein modifications that regulate protein activity. Such modifications are usually enzyme-driven.
Protein kinases
Many proteins in the cell are regulated by phosphorylation, the addition of a phosphate group. A family of enzymes called kinases...

Phosphorylation

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The addition or removal of phosphate groups from proteins is the most common chemical modification that regulates cellular processes. These modifications can affect the structure, activity, stability, and localization of proteins within cells as well as their interactions with other proteins.
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Related Experiment Video

Updated: May 31, 2026

Nucleoside Triphosphates - From Synthesis to Biochemical Characterization

Nucleoside Triphosphates - From Synthesis to Biochemical Characterization

Published on: April 3, 2014

RbSn(2)(PO(4))(3), a NASICON-type phosphate.

Dan Zhao¹, Feifei Li, Shen Qiu

¹Department of Physics and Chemistry, Henan Polytechnic University, Jiaozuo, Henan 454000, People's Republic of China.

Acta Crystallographica. Section E, Structure Reports Online

|July 15, 2011

Summary

Rubidium ditin(IV) tris-(phosphate) (RbSn2(PO4)3) exhibits a NASICON-type crystal structure. This phosphate framework features linked tin and phosphate polyhedra with rubidium cations in its voids.

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Chemical Triphosphorylation of Oligonucleotides

Chemical Triphosphorylation of Oligonucleotides

Published on: June 2, 2022

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Last Updated: May 31, 2026

Nucleoside Triphosphates - From Synthesis to Biochemical Characterization

Nucleoside Triphosphates - From Synthesis to Biochemical Characterization

Published on: April 3, 2014

Chemical Triphosphorylation of Oligonucleotides

Chemical Triphosphorylation of Oligonucleotides

Published on: June 2, 2022

Area of Science:

Inorganic Chemistry
Solid-State Chemistry
Crystallography

Background:

NASICON-type phosphates are known for their potential applications in solid electrolytes and ion-conductors.
Understanding the structural intricacies of novel phosphate compounds is crucial for materials science advancements.

Purpose of the Study:

To elucidate the crystal structure of rubidium ditin(IV) tris-(phosphate), RbSn2(PO4)3.
To characterize the coordination environment of cations and the framework architecture.

Main Methods:

Single-crystal X-ray diffraction was employed to determine the crystal structure.
Analysis of polyhedral linkages and cation positions within the framework.

Main Results:

RbSn2(PO4)3 crystallizes in the rhombohedral space group R3c, adopting a NASICON-type structure.
The framework consists of corner-sharing PO4 tetrahedra and SnO6 octahedra, forming a 3D network.
Rubidium cations (Rb+) are located in the framework voids with a coordination number of 12.
The crystal exhibited merohedral twinning with a precise component ratio.

Conclusions:

The detailed crystal structure of RbSn2(PO4)3 provides fundamental insights into NASICON-type phosphate materials.
The identified structural features, including cation coordination and framework topology, are important for predicting material properties.