polypeptide: meaning, definition, pronunciation and examples
C1/C2Technical/Scientific
Quick answer
What does “polypeptide” mean?
A chain of amino acids linked by peptide bonds.
Audio
Pronunciation
Definition
Meaning and Definition
A chain of amino acids linked by peptide bonds; a basic structural component of proteins.
A molecule consisting of many amino acids, typically produced by ribosomes from messenger RNA instructions, which may function independently or fold into larger protein structures.
Dialectal Variation
British vs American Usage
Differences
No significant spelling or meaning differences. Usage is identical and confined to technical contexts.
Connotations
Purely scientific, with no cultural or idiomatic connotations in either variety.
Frequency
Extremely rare outside biochemistry, molecular biology, and medicine. Frequency is identical in UK and US academic writing.
Grammar
How to Use “polypeptide” in a Sentence
[verb] + polypeptide (e.g., synthesize, cleave, fold, purify, sequence, a polypeptide)polypeptide + [verb] (e.g., the polypeptide binds, functions, circulates, folds)polypeptide + [preposition] + [noun] (e.g., polypeptide of 50 residues, polypeptide in solution, polypeptide with activity)Vocabulary
Collocations
Examples
Examples of “polypeptide” in a Sentence
verb
British English
- [No common verb form]
American English
- [No common verb form]
adverb
British English
- [No adverb form]
American English
- [No adverb form]
adjective
British English
- The polypeptide sequence was analysed.
- Polypeptide synthesis is a key step.
American English
- They studied the polypeptide structure.
- Polypeptide hormones were purified.
Usage
Meaning in Context
Business
Virtually never used, except in biotech/pharma R&D reports.
Academic
Core term in biochemistry, molecular biology, genetics, and medical research.
Everyday
Not used in everyday conversation.
Technical
Primary domain: describes intermediates in protein synthesis, synthetic biology constructs, and therapeutic agents.
Vocabulary
Synonyms of “polypeptide”
Vocabulary
Antonyms of “polypeptide”
Watch out
Common Mistakes When Using “polypeptide”
- Misspelling as 'polypeptid' or 'polypeptide'.
- Using it interchangeably with 'protein' (a protein may consist of one or more folded polypeptide chains).
- Incorrect plural: 'polypeptides' is correct.
FAQ
Frequently Asked Questions
Not exactly. A polypeptide is a chain of amino acids. A protein is a functional biomolecule typically composed of one or more polypeptides that have folded into a specific three-dimensional structure.
There's no strict cutoff, but typically a chain of more than about 20 amino acids is called a polypeptide. Shorter chains are often called oligopeptides.
Polypeptides are synthesized by ribosomes, which read messenger RNA (mRNA) sequences and link amino acids together in the correct order.
Nearly all enzymes are proteins, and therefore are made of polypeptide chains. Some RNA molecules (ribozymes) also have enzymatic activity and are not polypeptides.
A chain of amino acids linked by peptide bonds.
Polypeptide is usually technical/scientific in register.
Polypeptide: in British English it is pronounced /ˌpɒl.iˈpɛp.taɪd/, and in American English it is pronounced /ˌpɑː.liˈpɛp.taɪd/. Tap the audio buttons above to hear it.
Phrases
Idioms & Phrases
- “[No common idioms exist for this technical term]”
Learning
Memory Aids
Mnemonic
Think 'POLY-mer of PEPtides' – many (poly) small protein bits (peptides) linked in a chain.
Conceptual Metaphor
A polypeptide is a 'beaded necklace' where each bead is an amino acid, or a 'sentence' where amino acids are letters forming a biological instruction.
Practice
Quiz
What primarily distinguishes a polypeptide from a protein?