1u22 is a 1 chain structure with sequence from Arabidopsis thaliana. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
↑Ravanel S, Block MA, Rippert P, Jabrin S, Curien G, Rébeillé F, Douce R. Methionine metabolism in plants: chloroplasts are autonomous for de novo methionine synthesis and can import S-adenosylmethionine from the cytosol. J Biol Chem. 2004 May 21;279(21):22548-57. PMID:15024005 doi:10.1074/jbc.M313250200