2011
DOI: 10.1073/pnas.1016644108
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Human sweet taste receptor mediates acid-induced sweetness of miraculin

Abstract: Miraculin (MCL) is a homodimeric protein isolated from the red berries of Richadella dulcifica. MCL, although flat in taste at neutral pH, has taste-modifying activity to convert sour stimuli to sweetness. Once MCL is held on the tongue, strong sweetness is sensed over 1 h each time we taste a sour solution. Nevertheless, no molecular mechanism underlying the taste-modifying activity has been clarified. In this study, we succeeded in quantitatively evaluating the acid-induced sweetness of MCL using a cell-base… Show more

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Cited by 58 publications
(33 citation statements)
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“…According to Koizumi et al (2011) andMisaka (2013), the ability of miraculim to modify taste perception from sour to sweet depends on the pH. Miraculin is likely to be in equilibrium between being an agonist and an antagonist at acidic and neutral pH, respectively.…”
Section: Time-intensity (Ti)mentioning
confidence: 99%
“…According to Koizumi et al (2011) andMisaka (2013), the ability of miraculim to modify taste perception from sour to sweet depends on the pH. Miraculin is likely to be in equilibrium between being an agonist and an antagonist at acidic and neutral pH, respectively.…”
Section: Time-intensity (Ti)mentioning
confidence: 99%
“…At neutral pH the active component of the berry, the protein miraculin, binds the T1R2/T1R3 receptor with high affinity, but it does not activate the receptor. A switch to acid pH (4.8–6.5) causes the bound ligand to become a strong agonist, eliciting a sweet sensation (Koizumi et al, 2013). Interestingly, only humans and old world monkeys taste miraculin, at any pH, as sweet, due to a structural determinant in the amino terminal region of T1R2 found only in these species (Koizumi et al, 2013).…”
Section: Introductionmentioning
confidence: 99%
“…a slice of lemon will taste sickly sweet; see [25,[30][31][32]). Miraculin is thought to attach itself to the taste receptors on the tongue [33]. When a person subsequently bites into a slice of lemon, lime, or perhaps a packet of salt and vinegar crisps, the pH in their mouth drops, and somehow (though researchers are still uncertain quite how), the sweet receptors are activated.…”
Section: Some Classic Combinations To Avoid Red Wine and Seafoodmentioning
confidence: 99%