lysine
C2Technical/Scientific, Academic
Definition
Meaning
An essential amino acid necessary for human and animal nutrition, involved in protein synthesis and various bodily functions.
A basic, positively charged amino acid (C6H14N2O2) with the chemical formula HO2CCH(NH2)(CH2)4NH2. It is a building block for proteins and is crucial for growth, tissue repair, and the production of hormones, enzymes, and antibodies. It must be obtained from the diet as the body cannot synthesize it.
Linguistics
Semantic Notes
Primarily a biochemical term. It is not typically used in figurative or abstract senses. Its usage is almost exclusively within the domains of nutrition, biochemistry, medicine, and agriculture (animal feed).
Dialectal Variation
British vs American Usage
Differences
No significant lexical or usage differences. Both varieties use the same term. Minor potential differences in spelling of related terms in example sentences (e.g., 'analyse' vs. 'analyze').
Connotations
None. The term is purely denotative and scientific.
Frequency
Equally infrequent in general discourse for both varieties. Frequency is tied directly to technical and scientific contexts.
Vocabulary
Collocations
Grammar
Valency Patterns
[Noun] is high/rich in lysine.[Noun] contains/provides lysine.[Noun] requires/needs lysine.Lysine is essential for [noun/gerund].Vocabulary
Synonyms
Strong
Usage
Context Usage
Business
Used in the context of the food supplement, animal feed additive, and nutraceutical industries (e.g., 'The company specializes in producing lysine for poultry feed.').
Academic
Central term in biochemistry, nutritional science, and physiology papers (e.g., 'The study examined the role of lysine in collagen cross-linking.').
Everyday
Very rare. Might appear on food/nutrition labels, in discussions of vegan/vegetarian diets, or in fitness contexts (e.g., 'Legumes are a good source of lysine for vegetarians.').
Technical
Precise term in laboratory research, pharmaceutical formulations, and detailed dietary analysis (e.g., 'The peptide sequence had a lysine residue at position 29.').
Examples
By Part of Speech
verb
British English
- Scientists lysinated the protein to study its function.
American English
- Researchers lysinated the protein to study its function.
adjective
British English
- The lysine-deficient diet led to health problems.
American English
- The lysine-deficient diet led to health problems.
Examples
By CEFR Level
- Some foods, like beans and quinoa, have a lot of lysine.
- Your body needs lysine to stay healthy.
- Athletes sometimes pay attention to their lysine intake for muscle repair.
- A deficiency in this essential amino acid, lysine, can impair growth.
- The biochemical pathway for lysine catabolism differs between mammals and plants.
- Supplementation with lysine is often recommended to counteract deficiencies in cereal-based diets.
Learning
Memory Aids
Mnemonic
Think: 'LYSINE is a LINE of building blocks you LYS' (from) your diet because your body can't make it.
Conceptual Metaphor
A BUILDING BLOCK or BRICK (for constructing proteins and tissues).
Watch out
Common Pitfalls
Translation Traps (for Russian speakers)
- Direct cognate: 'лизин' (lizin). Pronunciation and meaning are identical, so no trap exists.
Common Mistakes
- Misspelling as 'lysin', 'lysene', or 'lisine'.
- Confusing it with other amino acids like 'leucine' or 'lysine's structural similarity to 'ornithine'.
- Using it as a countable noun in plural form without need (e.g., 'lysines' is rare; prefer 'lysine molecules' or 'lysine residues').
Practice
Quiz
In which of the following contexts is the word 'lysine' MOST likely to be used correctly?
FAQ
Frequently Asked Questions
Yes, lysine is an essential amino acid for all humans, meaning it is necessary for health but must come from the diet. It is vital for protein synthesis, calcium absorption, and hormone production.
Excellent sources include meat (especially red meat, pork, poultry), fish (such as cod and sardines), dairy products (cheese, yogurt), eggs, soybeans, and legumes (like lentils and chickpeas).
While generally safe, very high doses from supplements can cause side effects like abdominal pain, diarrhoea, and gallstones. It is always best to consult a healthcare professional before starting any supplement regimen.
Because the most concentrated sources are animal products, vegetarians and especially vegans need to carefully combine plant-based proteins (e.g., grains with legumes) to ensure they get adequate lysine in their diet.