This is the C-terminal domain of phosphoribosylformylglycinamidine synthase II in Thermatoga and related species [1].

1: Crystal structure of phosphoribosylformylglycinamidine synthase II (smPurL) from Thermotoga maritima at 2.15 A resolution. Mathews II, Krishna SS, Schwarzenbacher R, McMullan D, Abdubek P, Ambing E, Canaves JM, Chiu HJ, Deacon AM, DiDonato M, Elsliger MA, Godzik A, Grittini C, Grzechnik SK, Hale J, Hampton E, Han GW, Haugen J, Jaroszewski L, Klock HE, Koesema E, Kreusch A, Kuhn P, Lesley SA, Levin I, Miller MD, Moy K, Nigoghossian E, Paulsen J, Quijano K, Reyes R, Spraggon G, Stevens RC, van den Bedem H, Velasquez J, White A, Wolf G, Xu Q, Hodgson KO, Wooley J, Wilson IA; Proteins. 2006;63:1106-1111. PMID:16544324