polypeptide chain
[/ˌpɒliˈpɛptaɪd tʃeɪn/]
nounfemininepl: polypeptide chains / cadeias polipeptídicas
cadeia polipeptídica
1. A linear sequence of amino acids linked together by peptide bonds, forming a fundamental structure of proteins
The polypeptide chain is synthesized by ribosomes during protein translation.
A cadeia polipeptídica é sintetizada pelos ribossomos durante a tradução proteica.
2. One of the separate amino acid chains that may comprise a multi-subunit protein
Hemoglobin consists of four polypeptide chains, two alpha and two beta chains.
A hemoglobina é composta por quatro cadeias polipeptídicas, duas cadeias alfa e duas cadeias beta.
3. The primary structure of a protein before it undergoes folding and modification
The polypeptide chain folds into a three-dimensional structure stabilized by hydrogen bonds.
A cadeia polipeptídica se dobra em uma estrutura tridimensional estabilizada por ligações de hidrogênio.
This is a technical scientific term used universally in both English and Portuguese academic and research settings. It is fundamental to biochemistry, molecular biology, and biotechnology fields. The term appears in educational curricula at the university level and in scientific publications across both Brazil and the United States without regional variation in meaning.
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