nicotianamine aminotransferase;
NAAT;
NAAT-I;
NAAT-II;
NAAT-III;
nicotianamine transaminase

Transferases;
Transferring nitrogenous groups;
Transaminases

nicotianamine:2-oxoglutarate aminotransferase

nicotianamine + 2-oxoglutarate = 3''-deamino-3''-oxonicotianamine + L-glutamate [RN:R07277]

R07277

nicotianamine [CPD:C05324];
2-oxoglutarate [CPD:C00026]

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.

1

Kanazawa, K., Higuchi, K., Nishizawa, N.-K., Fushiya, S., Chino, M. and Mori, S.

Nicotianamine aminotransferase activities are correlated with the phytosiderophore secretions under Fe-deficient conditions in Gramineae.

J. Exp. Bot. 45 (1994) 1903-1906.

2  [PMID:10557244]

Takahashi M, Yamaguchi H, Nakanishi H, Shioiri T, Nishizawa NK, Mori S.

Cloning two genes for nicotianamine aminotransferase, a critical enzyme in iron acquisition (Strategy II) in graminaceous plants.

Plant. Physiol. 121 (1999) 947-56.

Hordeum vulgare

3  [PMID:14699112]

Schaaf G, Ludewig U, Erenoglu BE, Mori S, Kitahara T, von Wiren N.

ZmYS1 functions as a proton-coupled symporter for phytosiderophore- and nicotianamine-chelated metals.

J. Biol. Chem. 279 (2004) 9091-6.

Zea mays [GN:zma]