dephosphorylation
C2Technical/Scientific
Definition
Meaning
The process of removing a phosphate group from a molecule, especially from a protein.
A biochemical reaction where a phosphate ester is hydrolyzed, converting a phosphorylated compound (e.g., ATP, phosphoprotein) into a dephosphorylated form, often with the release of inorganic phosphate. It is a key regulatory mechanism in cell signaling, metabolism, and enzyme activity.
Linguistics
Semantic Notes
Primarily used in biochemistry, molecular biology, and cellular biology. It describes a chemical reaction that is often enzymatic (catalyzed by phosphatases). The term is almost exclusively used as a mass noun. It is the opposite of phosphorylation.
Dialectal Variation
British vs American Usage
Differences
No significant differences in meaning, spelling, or usage. The term is uniformly used in international scientific English.
Connotations
None beyond the strict scientific definition.
Frequency
Identically low frequency in both varieties, confined to specialist academic and research contexts.
Vocabulary
Collocations
Grammar
Valency Patterns
The dephosphorylation of [PROTEIN/COMPOUND] by [ENZYME]Dephosphorylation leads to [RESULT/EFFECT][ENZYME/AGENT] catalyzes the dephosphorylation of [SUBSTRATE]Vocabulary
Synonyms
Strong
Neutral
Weak
Vocabulary
Antonyms
Usage
Context Usage
Business
Not used.
Academic
Central term in biochemistry and molecular biology research papers, lectures, and textbooks.
Everyday
Virtually never used outside a scientific/medical education context.
Technical
Precisely used in laboratory protocols, scientific discussions, and technical documentation related to cell signaling and metabolism.
Examples
By Part of Speech
verb
British English
- The enzyme dephosphorylates the activated protein.
American English
- The phosphatase will dephosphorylate the substrate.
adjective
British English
- The dephosphorylated form of the protein is inactive.
American English
- We observed the dephosphorylated state via gel electrophoresis.
Examples
By CEFR Level
- The balance between phosphorylation and dephosphorylation controls many cell functions.
- Subsequent dephosphorylation of the kinase by a specific phosphatase terminates the signal transduction cascade.
Learning
Memory Aids
Mnemonic
Think of 'de-' as 'removing' and 'phosphorylation' as 'adding a phosphate'. So, dephosphorylation is 'removing a phosphate that was added'.
Conceptual Metaphor
OFF SWITCH (for biological processes). Dephosphorylation often turns off a protein's activity, analogous to flipping a switch to the 'off' position.
Watch out
Common Pitfalls
Translation Traps (for Russian speakers)
- Avoid literal translation of parts ('de-' + 'phosphor' + 'ylation'). Use the established term 'дефосфорилирование'.
- Do not confuse with related processes like 'dephosphorization' (removal of phosphorus, e.g., from metal).
Common Mistakes
- Mispronouncing as 'de-phos-FOR-ilation' (stress is typically on the 'lay' syllable).
- Using it as a countable noun (e.g., 'a dephosphorylation'). It is generally uncountable.
- Confusing the agents: stating a kinase (which adds phosphate) performs dephosphorylation.
Practice
Quiz
What is the direct chemical result of dephosphorylation?
FAQ
Frequently Asked Questions
Dephosphorylation is a specific type of hydrolysis reaction where the bond between a phosphate group and an organic molecule (like a protein or ATP) is broken using water.
Dephosphorylation is typically catalyzed by enzymes called phosphatases.
It is crucial for turning off signals in cells, regulating metabolism, and reversing the effects of phosphorylation, allowing for dynamic control of biological processes.
Yes, but it is usually very slow. Enzymatic dephosphorylation by phosphatases is fast, specific, and biologically regulated.