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词汇 cysteine
释义

Definition of cysteine in English:

cysteine

noun ˈsɪstɪɪnˈsɪstɪiːnˈsɪstiːnˈsɪsteɪnˈsistəˌēn
mass nounBiochemistry
  • A sulphur-containing amino acid which occurs in keratins and other proteins, often in the form of cystine, and is a constituent of many enzymes.

    〔生化〕半胱氨酸, 巯基丙氨酸

    Chemical formula: HSCH₂CH(NH₂)COOH

    Example sentencesExamples
    • As long as the supply of methionine is adequate, cysteine is considered as nonessential.
    • The integration of reduced sulphur into the amino acid cysteine is a central step in the assimilation of inorganic sulphur.
    • Whey proteins are also rich in the sulfur-containing amino acids cysteine and methionine.
    • Most of the sulfate substrate comes from sulfoxidation of the amino acid cysteine.
    • The gelatinase activity was due to metalloproteinases and not cysteine or serine proteinases.

Origin

Late 19th century: from cystine + -eine (variant of -ine4).

Definition of cysteine in US English:

cysteine

nounˈsistəˌēn
Biochemistry
  • A sulfur-containing amino acid which occurs in keratins and other proteins, often in the form of cystine, and is a constituent of many enzymes.

    〔生化〕半胱氨酸, 巯基丙氨酸

    Chemical formula: HSCH₂CH(NH₂)COOH

    Example sentencesExamples
    • The gelatinase activity was due to metalloproteinases and not cysteine or serine proteinases.
    • The integration of reduced sulphur into the amino acid cysteine is a central step in the assimilation of inorganic sulphur.
    • Whey proteins are also rich in the sulfur-containing amino acids cysteine and methionine.
    • Most of the sulfate substrate comes from sulfoxidation of the amino acid cysteine.
    • As long as the supply of methionine is adequate, cysteine is considered as nonessential.

Origin

Late 19th century: from cystine + -eine (variant of -ine).

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