title: From miracle fruit to transgenic tomato: mass production of the taste-modifying protein miraculin in transgenic plants.
abstract: The utility of plants as biofactories has progressed in recent years. Some recombinant plant-derived pharmaceutical products have already reached the marketplace. However, with the exception of drugs and vaccines, a strong effort has not yet been made to bring recombinant products to market, as cost-effectiveness is critically important for commercialization. Sweet-tasting proteins and taste-modifying proteins have a great deal of potential in industry as substitutes for sugars and as artificial sweeteners. The taste-modifying protein, miraculin, functions to change the perception of a sour taste to a sweet one. This taste-modifying function can potentially be used not only as a low-calorie sweetener but also as a new seasoning that could be the basis of a new dietary lifestyle. However, miraculin is far from inexpensive, and its potential as a marketable product has not yet been fully developed. For the last several years, biotechnological production of this taste-modifying protein has progressed extensively. In this review, the characteristics of miraculin and recent advances in its production using transgenic plants are summarized, focusing on such topics as the suitability of plant species as expression hosts, the cultivation method for transgenic plants, the method of purifying miraculin and future advances required to achieve industrial use.
authors.affiliation: Graduate School of Life and Environmental Sciences, University of Tsukuba, Tennodai 1-1-1, Tsukuba, Ibaraki 305-8572, Japan.
authors.forename: Kyoko
authors.initials: K
authors.lastname: Hiwasa-Tanase
authors.forename: Tadayoshi
authors.initials: T
authors.lastname: Hirai
authors.forename: Kazuhisa
authors.initials: K
authors.lastname: Kato
authors.forename: Narendra
authors.initials: N
authors.lastname: Duhita
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Ezura
mesh_terms: D019649:Food Industry; D059022:Food Safety; D005638:Fruit / Q000378:metabolism*; D015870:Gene Expression; D006023:Glycoproteins / Q000096:biosynthesis* / Q000302:isolation & purification; D018551:Solanum lycopersicum / Q000235:genetics / Q000254:growth & development / Q000378:metabolism*; D030821:Plants, Genetically Modified; D013549:Sweetening Agents; D032133:Synsepalum / Q000235:genetics*; D013649:Taste; D014170:Transformation, Genetic
chemical_list: D006023:Glycoproteins; D013549:Sweetening Agents; C008533:miraculin protein, Synsepalum dulcificum