leucine: meaning, definition, pronunciation and examples
C2Specialized technical (biochemistry, nutrition, medicine)
Quick answer
What does “leucine” mean?
An essential amino acid, important for protein synthesis and muscle repair.
Audio
Pronunciation
Definition
Meaning and Definition
An essential amino acid, important for protein synthesis and muscle repair.
A hydrophobic, branched-chain amino acid (BCAA) with the chemical formula C₆H₁₃NO₂, one of the nine amino acids humans must obtain from their diet. It is encoded by six codons in genetic sequences (UUA, UUG, CUU, CUC, CUA, CUG).
Dialectal Variation
British vs American Usage
Differences
No significant lexical or usage differences; spelling is identical.
Connotations
No distinct connotations beyond the scientific meaning.
Frequency
Equally rare in general discourse but standard in relevant scientific fields in both varieties.
Grammar
How to Use “leucine” in a Sentence
Leucine is essential for [noun phrase].The [noun phrase] contains leucine.A deficiency in leucine leads to [noun phrase].Vocabulary
Collocations
Examples
Examples of “leucine” in a Sentence
adjective
British English
- The leucine residue is critical for function.
- A leucine-rich repeat domain was identified.
American English
- The leucine pathway is being studied.
- Look for the leucine zipper motif.
Usage
Meaning in Context
Business
Rare, except in marketing for fitness supplements (e.g., 'Our formula contains 3g of leucine per serving').
Academic
Common in biochemistry, nutrition, molecular biology, and medical research papers.
Everyday
Very rare; limited to discussions of fitness, specialised diets, or health conditions.
Technical
Standard term in protein chemistry, metabolic pathways, and genetic coding.
Vocabulary
Synonyms of “leucine”
Neutral
Weak
Vocabulary
Antonyms of “leucine”
Watch out
Common Mistakes When Using “leucine”
- Mispronunciation as /ˈljuː.saɪn/ or /luːˈsiːn/.
- Confusing it with 'lysine' (another amino acid).
- Using it as a countable noun (*'a leucine') in general contexts.
FAQ
Frequently Asked Questions
Animal proteins like chicken, beef, fish, eggs, and dairy products (whey protein), as well as soybeans and nuts.
L-leucine is the biologically active form found in proteins and used by the body. The term 'leucine' typically refers to L-leucine in biological contexts.
No, leucine is an essential amino acid, meaning the human body cannot synthesise it and it must be obtained from the diet.
A common structural motif in proteins where leucine residues at regular intervals create a 'zipper' that allows two alpha-helices to bind together, often found in DNA-binding proteins.
An essential amino acid, important for protein synthesis and muscle repair.
Leucine is usually specialized technical (biochemistry, nutrition, medicine) in register.
Leucine: in British English it is pronounced /ˈluː.siːn/, and in American English it is pronounced /ˈluː.siːn/. Tap the audio buttons above to hear it.
Learning
Memory Aids
Mnemonic
Think of a LEU (like a lion) getting LEAN and muscular. LEUCINE helps build lean muscle.
Conceptual Metaphor
BUILDING BLOCK (for proteins/muscle), FUEL (for muscle metabolism), CODE/INSTRUCTION (in genetic sequences).
Practice
Quiz
Leucine is primarily discussed in which of the following contexts?