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Related Concept Videos

The Phosphorus Cycle01:21

The Phosphorus Cycle

Unlike carbon, water, and nitrogen, phosphorus is not present in the atmosphere as a gas. Instead, most phosphorus in the ecosystem exists as compounds, such as phosphate ions (PO43-), found in soil, water, sediment and rocks. Phosphorus is often a limiting nutrient (i.e., in short supply). Consequently, phosphorus is added to most agricultural fertilizers, which can cause environmental problems related to runoff in aquatic ecosystems.
Phosphorylation01:02

Phosphorylation

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.
During phosphorylation, protein kinases transfer the terminal phosphate group of ATP to specific amino acid side chains of substrate proteins. Serine, threonine, and tyrosine are the most commonly...
Phosphorylation01:02

Phosphorylation

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.
During phosphorylation, protein kinases transfer the terminal phosphate group of ATP to specific amino acid side chains of substrate proteins. Serine, threonine, and tyrosine are the most commonly...
Phosphate Buffer01:22

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...
Phosphodiester Linkages01:01

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
DNA and RNA are polynucleotides or long chains of nucleotides that are linked together. A nucleotide is...
Protein Kinases and Phosphatases02:54

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...

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Related Experiment Video

Updated: May 15, 2026

Assaying for Inorganic Polyphosphate in Bacteria
07:20

Assaying for Inorganic Polyphosphate in Bacteria

Published on: January 21, 2019

Why nature really chose phosphate.

Shina C L Kamerlin1, Pankaz K Sharma, Ram B Prasad

  • 1Department of Cell and Molecular Biology (ICM), Uppsala Biomedical Centre, Uppsala University, Box 596, S-751 24 Uppsala, Sweden.

Quarterly Reviews of Biophysics
|January 16, 2013
PubMed
Summary

Phosphoryl transfer, essential for life, involves complex mechanisms. Nature chose phosphate due to its charge, enabling both inertness and crucial biological regulation for signaling and metabolism.

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Optimized Procedure for Determining the Adsorption of Phosphonates onto Granular Ferric Hydroxide using a Miniaturized Phosphorus Determination Method
08:21

Optimized Procedure for Determining the Adsorption of Phosphonates onto Granular Ferric Hydroxide using a Miniaturized Phosphorus Determination Method

Published on: May 18, 2018

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Last Updated: May 15, 2026

Assaying for Inorganic Polyphosphate in Bacteria
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Assaying for Inorganic Polyphosphate in Bacteria

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Optimized Procedure for Determining the Adsorption of Phosphonates onto Granular Ferric Hydroxide using a Miniaturized Phosphorus Determination Method
08:21

Optimized Procedure for Determining the Adsorption of Phosphonates onto Granular Ferric Hydroxide using a Miniaturized Phosphorus Determination Method

Published on: May 18, 2018

Area of Science:

  • Biochemistry
  • Chemical Biology
  • Physical Chemistry

Background:

  • Phosphoryl transfer is fundamental to cellular processes like signaling and energy transduction.
  • The reaction appears simple but involves complex phosphorus chemistry with multiple mechanistic pathways.
  • Traditional experimental methods struggle to differentiate between these mechanisms.

Purpose of the Study:

  • To revisit the critical question of why nature selected phosphate for biological processes.
  • To explore enzymatic and aqueous solution chemistry of phosphoryl transfer.
  • To emphasize the necessity of theoretical studies for resolving mechanistic ambiguities.

Main Methods:

  • Review of existing literature on phosphoryl transfer.
  • Analysis of enzymatic systems and solution chemistry.
  • Emphasis on theoretical computational studies.

Main Results:

  • Phosphate's negative charge creates a high hydrolysis barrier, rendering phosphate esters inert.
  • Electrostatic repulsion, while hindering hydrolysis, allows for precise biological regulation.
  • This charge-based regulation is vital for biological cascades like signaling and metabolism.

Conclusions:

  • Nature's choice of phosphate is a balance between inertness and tunable reactivity.
  • Electrostatic properties of phosphate are key to its regulatory role in biological systems.
  • Phosphate esters are ideally suited for facilitating life's essential processes through regulated reactions.