4 syllables: i, so, mer, ase. Stress on i.
/ˈaɪ sə mɚ eɪz/
Say it backIsomerase is an enzyme that catalyzes the isomerization of a substrate, often rearranging atoms within a molecule. It facilitates structural changes without adding or removing atoms, enabling processes in metabolism and biosynthesis. The term combines 'isomer' + '-ase' and is used broadly across biochemistry to denote this class of catalysts.
"The isomerase converts glucose-6-phosphate into fructose-6-phosphate in the glycolytic pathway."
"Researchers studied a novel isomerase that reshapes the substrate to enable downstream reactions."
"Mutations in the isomerase active site can disrupt metabolic flux and lead to disease."
Pronounce it as /ˌɪˈsoʊ.məˌreɪz/ in US English, with primary stress on the 'so' syllable and secondary stress on the 're' part in many pronunciations. US: ih-SOH-muh-rayz. UK/AU listeners may reduce the second vowel slightly: /ˌaɪˈsɒmɪˌreɪz/ or /ɪˈsɒm.əˌreɪz/ depending on speaker. Position your tongue high for 'i', mid for 'o', and end with the 'z' sound. You can listen to expert pronunciations on Forvo or YouGlish and mimic the rhythm.”,
Common errors include placing stress on the first syllable (IS-o-me-rase) and mispronouncing the 'er' as a long 'air' instead of a schwa-like 'uh' in the third syllable. Another frequent issue is pronouncing the final 'ase' as 'ass' or 'ayss' rather than 'ayz'. Correction: use secondary stress on the third syllable and end with a voiced alveolar sibilant 'z': ih-SOH-muh-rayz. Practice with ample audio reference and segmental drills.
In US English, you’ll often hear /ˌɪˈsoʊ.məˌreɪz/ with clear 'oh' in the second syllable and a light schwa in the third. UK English tends to reduce the first vowel slightly and may show /ˌaɪˈsɒm.əˌreɪz/ or /ɪˈsɒməˌreɪz/, with less rhoticity and different vowel quality on the first syllable. Australian English generally aligns with non-rhotic tendencies and may have /ˌaɪˈsɒməˌreɪz/ or /ɪˈsɒməˌreɪz/ with subtle length differences. Listen to examples from Cambridge or Oxford dictionaries to compare.”,
Two main challenges: the sequence of two 's'–'m'–'e' sounds next to each other and the final '-ase' yields a voiced 'z' that can blur with previous sibilants. Additionally, the shift of primary stress in multisyllabic scientific terms requires careful rhythm control. Tip: segment it as i-so-me-rayz, place stress on the middle or near-middle syllable, then blend the final 'rayz' smoothly with your jaw and tongue. IPA anchors: /ˌɪˈsoʊ.məˌreɪz/.
There are no silent letters in isomerase. Each letter contributes to the sounds: the initial 'i' /ɪ/ or /aɪ/ depending on your accent, 'o' as /oʊ/ or /ɒ/, 'e' is schwa-ish in the middle, and the final 'ase' yields /reɪz/ with a voiced 'z'. Focus on crisp enunciation of the final -z so it doesn’t become an extra breath or a voiceless ‘s’.
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Tip: focus on the transition between /mə/ and /reɪz/—a smooth glide helps you avoid a break that makes the pronunciation sound choked.
isomerase derives from isomer (from the Greek isos ‘equal’ and meros ‘part, portion’) referring to compounds with the same formula but different arrangements, combined with the Latin suffix -ase indicating an enzyme. The term crystallized in biochemical literature in the 20th century as scientists expanded the catalog of enzymes beyond oxidoreductases and hydrolases to include isomeric transformations catalyzed within cells. Early use appeared in enzymology texts when characterizing enzymes like phosphoglucose isomerase (PGI) and triose phosphate isomerase (TIM), which were among the first well-studied isomerases. As molecular biology advanced, researchers introduced broader family classifications: aldose–ketose isomerases, racemases, epimerases, and mutases, all sharing the catalytic motif of substrate rearrangement rather than bond cleavage or formation. The term has since generalized to any enzyme catalyzing an isomerization, including intramolecular rearrangements like cis–trans isomerizations and stereochemical inversions. In contemporary biochemistry, isomerase names are tied to specific substrate reactions (e.g., glucose-6-phosphate isomerase) but the root meaning remains anchored in transforming internal arrangement while preserving overall atom count. First known use is associated with early enzyme nomenclature in the mid-20th century, paralleling the formalization of enzymatic classifications under the -ase convention.
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💡 These words have similar meanings to "isomerase" and can often be used interchangeably.
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Words that rhyme with "isomerase"
-ize sounds
-yze sounds
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