This domain is found in DRL from Brucella abortus (Swiss:Q2YIM3) and other bacterial putative oxidoreductases and homoserine dehydrogenases. DRL is involved in isoprenoid biosynthesis. This protein is organised into three structural domains: N-terminal, central, (catalytic, this entry), and C-terminal. The catalytic domain shows an alpha/beta fold with a central four-stranded mixed beta-sheet. The active site lid is formed by a protusion made of two antiparallel helices connected by a short loop [1-2].

1: Crystal structure of Brucella abortus deoxyxylulose-5-phosphate reductoisomerase-like (DRL) enzyme involved in isoprenoid biosynthesis. Perez-Gil J, Calisto BM, Behrendt C, Kurz T, Fita I, Rodriguez-Concepcion M; J Biol Chem. 2012;287:15803-15809. PMID:22442144

2: A new family of enzymes catalyzing the first committed step of the methylerythritol 4-phosphate (MEP) pathway for isoprenoid biosynthesis in bacteria. Sangari FJ, Perez-Gil J, Carretero-Paulet L, Garcia-Lobo JM, Rodriguez-Concepcion M; Proc Natl Acad Sci U S A. 2010;107:14081-14086. PMID:20660776