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SYSTEMATIC NAME
IUBMB Comments
nicotianamine:2-oxoglutarate aminotransferase
A pyridoxal-phosphate protein. This enzyme is produced by grasses. They secrete both the nicotianamine and the transaminated product into the soil around them. Both compounds chelate iron(II) and iron(III); these chelators, called mugineic acid family phytosiderophores, are taken up by the grass, which is thereby supplied with iron.
a point mutation in a gene encoding nicotianamine aminotransferase (NAAT1) stimulates the Fe(II) acquisition system and leads to iron accumulation in rice
a point mutation in a gene encoding nicotianamine aminotransferase (NAAT1) stimulates the Fe(II) acquisition system and leads to iron accumulation in rice
OsNAAT1, but not OsNAAT2-6, is strongly up-regulated by Fe deficiency, both in roots and shoots; OsNAAT1, but not OsNAAT2-6, is strongly up-regulated by Fe deficiency, both in roots and shoots; OsNAAT1, but not OsNAAT2-6, is strongly up-regulated by Fe deficiency, both in roots and shoots; OsNAAT1, but not OsNAAT2-6, is strongly up-regulated by Fe deficiency, both in roots and shoots. OsNAAT1 expression is observed in the companion cells of Fe-sufficient shoots
OsNAAT1, but not OsNAAT2-6, is strongly up-regulated by Fe deficiency, both in roots and shoots; OsNAAT1, but not OsNAAT2-6, is strongly up-regulated by Fe deficiency, both in roots and shoots; OsNAAT1, but not OsNAAT2-6, is strongly up-regulated by Fe deficiency, both in roots and shoots; OsNAAT1, but not OsNAAT2-6, is strongly up-regulated by Fe deficiency, both in roots and shoots. OsNAAT1 is expressed in companion and pericycle cells adjacent to the protoxylem of Fe-sufficient roots
production of biofortified rice via introduction of the soybean ferritin gene (Soyfer H2) driven by two endosperm-specific promoters, along with the barley nicotianamine synthase gene NAS1, two nicotianamine aminotransferase genes Naat-A and Naat-B, and a mugineic acid synthase gene IDS3 to enhance mugineic acid production in rice plants. Lines expressing both ferritin and mugineic acid biosynthetic genes show signs of iron-deficiency tolerance in calcareous soil. The iron concentration in polished T3 seeds is increased by 4- and 2.5times, respectively; production of biofortified rice via introduction of the soybean ferritin gene (Soyfer H2) driven by two endosperm-specific promoters, along with the barley nicotianamine synthase gene NAS1, two nicotianamine aminotransferase genes Naat-A and Naat-B, and a mugineic acid synthase gene IDS3 to enhance mugineic acid production in rice plants. Lines expressing both ferritin and mugineic acid biosynthetic genes show signs of iron-deficiency tolerance in calcareous soil. The iron concentration in polished T3 seeds is increased by 4- and 2.5times, respectively
Inoue, H.; Takahashi, M.; Kobayashi, T.; Suzuki, M.; Nakanishi, H.; Mori, S.; Nishizawa, N.K.
Identification and localisation of the rice nicotianamine aminotransferase gene OsNAAT1 expression suggests the site of phytosiderophore synthesis in rice