<p>Ferredoxin-dependent glutamate synthases have been implicated in a number of functions including photorespiration in Arabidopsis where they may also play a role in primary nitrogen assimilation in roots [<cite idref="PUB00007209"/>]. This region is expressed as a seperate subunit in the glutamate synthase alpha subunit from archaebacteria, or part of a large multidomain enzyme in other organisms.</p><p>The aligned region of these proteins contains a putative FMN binding site and Fe-S cluster.</p>