Definition

Noun 1. An enzyme that catalyzes hydrolysis of phosphoric acid esters: Phosphatase refers to any enzyme within a large group that acts as a catalyst to remove a phosphate group from a molecule (such as a protein, nucleotide, or lipid) via a hydrolysis reaction. This action is crucial for regulating biological processes.

Usage and Examples

• General Scientific Usage: The term is used in biochemistry, molecular biology, and cell biology to describe enzymes essential for signal transduction, metabolism, and cell cycle control.
  • Alkaline phosphatase is a common enzyme used in laboratory diagnostics.
  • The activity of the phosphatase was measured in the cell extract.
  • Protein function is often regulated by the balance between kinase and phosphatase activity.

Advanced Usage and Context

• Specific Types: The general term "phosphatase" is often specified with a prefix denoting its substrate, cellular location, or optimal pH.
  • Protein phosphatase: Removes phosphate groups from proteins.
  • Acid phosphatase / Alkaline phosphatase: Classified based on their optimal pH for activity.
  • Dual-specificity phosphatase: Can remove phosphate groups from different amino acids (e.g., tyrosine and serine/threonine).

Variants and Related Words

• Phosphatase activity (noun phrase): The catalytic function or rate of a phosphatase enzyme.
• Dephosphorylation (noun): The chemical reaction catalyzed by a phosphatase—the removal of a phosphate group.
• Dephosphorylate (verb): The action of removing a phosphate group, typically catalyzed by a phosphatase.
  • The kinase phosphorylates the protein, and later a phosphatase dephosphorylates it.

Synonyms and Near-Synonyms

• Dephosphorylating enzyme: A descriptive synonym emphasizing the enzyme's function.
• Phosphohydrolase: A more technical biochemical term for enzymes that hydrolyze phosphoric esters.

Related Phrases and Compounds

• Phosphatase inhibitor (noun phrase): A substance that blocks the activity of a phosphatase enzyme.
  • The experiment required adding a phosphatase inhibitor to the buffer.
• Phosphatase assay (noun phrase): A laboratory test or procedure to measure the activity or concentration of a phosphatase.

Noun

1. any of a group of enzymes that act as a catalyst in the hydrolysis of organic phosphates