Tomato FK exhibits no identity with yeast HKI and only 14.7% identity was observed with Arabidopsis HKI (data not shown).
Sequences involved in ATP binding [18,20] and substrate recognition [20] have been proposed for microbial FKs.
These sequences are well conserved in plant FKs as well as in K. pneumoniaea, S.typhimurium, V. alginolyticus and R. leguminosarum, but interestingly not in Z. mobilis (data not shown).