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Cyclic phosphodiesterase (CPDase, O04147) is involved in the tRNA splicing pathway. This protein exhibits a bilobal arrangement of two alpha-beta modules. Two antiparallel helices are found on the outer side of each lobe and frame an antiparallel beta-sheet that is wrapped around an accessible cleft. Moreover, the beta-strands of each lobe interact with the other lobe. The central water-filled cavity houses the enzyme's active site .
2',3' Cyclic nucleotide phosphodiesterases (CPDases) are enzymes that catalyse at least two distinct steps in the splicing of tRNA introns in eukaryotes. The active site is characterised by two conserved histidine residues [PUBMED:12466548]. The enzyme has six cysteine residues, four of which are involved in forming two intra-molecular disulphide bridges. One of these bridges is involved in the catalytic activity of the enzyme as it opens when CPDase is semi-reduced [PUBMED:11694509].