>pfam03059 NAS Nicotianamine synthase protein. Nicotianamine synthase EC:2.5.1.43 catalyses the trimerisation of S-adenosylmethionine to yield one molecule of nicotianamine. Nicotianamine has an important role in plant iron uptake mechanisms. Plants adopt two strategies (termed I and II) of iron acquisition. Strategy I is adopted by all higher plants except graminaceous plants, which adopt strategy II. In strategy I plants, the role of nicotianamine is not fully determined: possible roles include the formation of more stable complexes with ferrous than with ferric ion, which might serve as a sensor of the physiological status of iron within a plant, or which might be involved in the transport of iron. In strategy II (graminaceous) plants, nicotianamine is the key intermediate (and nicotianamine synthase the key enzyme) in the synthesis of the mugineic family (the only known family in plants) of phytosiderophores. Phytosiderophores are iron chelators whose secretion by the roots is great

Probab=93.49  E-value=0.68  Score=26.14  Aligned_cols=20  Identities=25%  Similarity=0.492  Sum_probs=9.0

Q ss_pred             HHHHHHHHHHHCCCCCCEEE
Q ss_conf             99999999972078998999
Q gi|254780716|r   81 PVDQLIDKLKPLLSPEDILL  100 (475)
Q Consensus        81 ~v~~vi~~l~~~l~~g~iiI  100 (475)
T Consensus       209 ~K~~I~~hL~k~m~~Ga~l~  228 (277)
T pfam03059       209 EKAKVIDHLGKHMAPGALLV  228 (277)
T ss_pred             HHHHHHHHHHHHCCCCCEEE
T ss_conf             59999999997458996799