Definition of proline in US English:

proline

noun

Biochemistry
  • An amino acid which is a constituent of most proteins, especially collagen.

    A heterocyclic compound; chemical formula: C₅H₉NO₂

    • ‘The first five amino acids obtained were glycine, proline, threonine, glycine, and threonine.’
    • ‘The GPP protein also contains several regions rich in alanine, proline, histidine, and glutamine.’
    • ‘Active oxygen species cause protein damage through direct interaction with specific amino acids (lysine, arginine, proline or threonine).’
    • ‘The amount of the amino acids threonine, proline and histidine were also increased in roots of slag-cultivated maize plants.’
    • ‘The cationic component of the hemolymph is frequently replaced by potassium and free amino acids such as glutamate, proline, lysine and glycine.’

Origin

Early 20th century: contraction of the chemical name p(yr)rol(id)ine -2-carboxylic acid.

Pronunciation

proline

/ˈproʊˌlin//ˈprōˌlēn/