Dbr1 is an eukaryotic intron debranching enzyme that hydrolyses the linkages produced by the spliceosome in RNA for them to be processed into essential cellular factors, such as snoRNA and miRNA. This protein is organized into an N-terminal metallophosphoesterase (MPE) domain (Pfam:PF00149) and a C-terminal domain (CTD, this entry). This domain consists of four alpha-helices and three connecting loops. It is located on the posterior of the protein, opposite the active site and is joined to the MPE domain by an extended linker region [1-3].

1: Structural basis of lariat RNA recognition by the intron debranching enzyme Dbr1. Montemayor EJ, Katolik A, Clark NE, Taylor AB, Schuermann JP, Combs DJ, Johnsson R, Holloway SP, Stevens SW, Damha MJ, Hart PJ; Nucleic Acids Res. 2014;42:10845-10855. PMID:25123664

2: Metal dependence and branched RNA cocrystal structures of the RNA lariat debranching enzyme Dbr1. Clark NE, Katolik A, Roberts KM, Taylor AB, Holloway SP, Schuermann JP, Montemayor EJ, Stevens SW, Fitzpatrick PF, Damha MJ, Hart PJ; Proc Natl Acad Sci U S A. 2016;113:14727-14732. PMID:27930312

3: Crystal structure of the Entamoeba histolytica RNA lariat debranching enzyme EhDbr1 reveals a catalytic Zn(2+) /Mn(2+) heterobinucleation. Ransey E, Paredes E, Dey SK, Das SR, Heroux A, Macbeth MR; FEBS Lett. 2017;591:2003-2010. PMID:28504306