2 syllables: Cyst, eine. Stress on Cyst.
SIS-teen
/ˈsɪstiːn/
Cysteine is pronounced SIS-teen (/ˈsɪstiːn/). It has two syllables (Cyst-eine), with the stress on "Cyst". Cysteine is a sulfur-containing amino acid essential for disulfide bond formation and protein structure. It is a nonessential, polar amino acid that can be synthesized in humans but is also obtained from dietary sources. In biochemistry, cysteine often appears in peptide sequences and plays a key role in enzyme active sites and redox biology.
nounCysteine is a sulfur-containing amino acid essential for disulfide bond formation and protein structure. It is a nonessential, polar amino acid that can be synthesized in humans but is also obtained from dietary sources. In biochemistry, cysteine often appears in peptide sequences and plays a key role in enzyme active sites and redox biology.
"The enzyme's activity depends on the availability of cysteine for its thiol group."
"Researchers sequenced the protein and identified a cysteine-rich domain critical for folding."
"Cysteine residues form disulfide bridges that stabilize tertiary and quaternary structures."
Cysteine is pronounced SIS-teh-een in many contexts, with the primary stress on the first syllable. IPA: US ˈsɪsˌtiːˌiːn; UK ˈsɪsˌtiːˌiːn; AU ˈsɪsˌtiːˌiːn. Break it into syllables: cyste-ine (two main segments: cyste- as CIS-te and -eine as -teen with a long i). Keep the /s/ cluster clear and avoid turning the vowel into a diphthong; end with a long /iːn/. Audio reference: you can compare to
Common errors include misplacing stress (trying to emphasize the second syllable), mispronouncing the /sɪs/ as /sʌɪs/ or dulling the /tiː/ into a short /tɪ/ and dropping the final /iːn/. Another frequent issue is blending cyste- and -ine too tightly, producing cys-teen without a clear -ti- sequence. Correct by isolating the first two phonemes as /ˈsɪs/ and clearly enunciating /tiːən/ as two linked but distinct sounds: /tiːən/.
US and UK share the /ˈsɪsˌtiːˌiːn/ pattern, but you may hear slight vowel quality shifts: in US, the /ɪ/ may be tenser and the /iː/ longer; UK may have crisper consonants and less vowel reduction in rapid speech. Australian tends toward clearer vowel qualities with slightly more open /æ/ in related words, but cysteine remains /ˈsɪsˌtiːˌiːn/ with minimal rhotic influence since it ends in -een, not typically rhotic. All three retain primary stress on the first syllable.
Key challenges are the consonant cluster /sɪs/ followed by the affricate-like /tiː/ leading into a long /iːn/ ending; the sequence tests your ability to transition from a sibilant cluster to a tense vowel and a trailing nasal. The long /iː/ at the end can be tricky in non-native English speech, so keep the mouth open and relax the jaw to sustain the sound. Focus on syllable boundaries to avoid a fused, unclear ending.
A distinctive feature is the clear enunciation of the /tiː/ syllable leading into the final /iːn/. Some speakers reduce the middle vowel slightly in fast speech, but precise pronunciation keeps /tiː/ as a tense, high front vowel before the elongated /iːn/. The phrase can be practiced by isolating /ˈsɪs/ and then bridging to /tiːˌiːn/ without compressing the syllables.
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Cysteine derives from the Greek kystis (bladder) and the chemical suffix -ine common to amino acids, reflecting its earlier association with cysteine-rich proteins and the discovery in biological thiols. The modern term cysteine was established in the 19th and 20th centuries as amino acid chemistry advanced. The root cyst- connects to cysteine’s thiol group, a sulfur-containing functional group (-SH) characteristic of this amino acid. Early biochemical literature described cysteine as a product of methionine metabolism, and later, the redox-active thiol became central to understanding disulfide bond formation in proteins. The word entered widespread use with the development of amino acid sequencing and protein chemistry in the mid-20th century. First-named occurrences appear in foundational biochemistry texts circa the 1950s, with ongoing refinement as techniques revealed cysteine’s role in enzymatic catalysis and oxidative stress. The term has remained stable in English scientific nomenclature, while cross-linguistic variants reflect transliterations of thiol-containing amino acids in biochemical vocabularies.
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💡 These words have similar meanings to "Cysteine" and can often be used interchangeably.
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Words that rhyme with "Cysteine"
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