7o4e | pdb_00007o4e
The DYW domain of A. thaliana OTP86 in its inactive state
Structural highlights
Function[PP296_ARATH] Involved in RNA editing event in chloroplasts. Required for the editing of a single site in rps14 transcript.[1] Publication Abstract from PubMedRNA editosomes selectively deaminate cytidines to uridines in plant organellar transcripts-mostly to restore protein functionality and consequently facilitate mitochondrial and chloroplast function. The RNA editosomal pentatricopeptide repeat proteins serve target RNA recognition, whereas the intensively studied DYW domain elicits catalysis. Here we present structures and functional data of a DYW domain in an inactive ground state and activated. DYW domains harbour a cytidine deaminase fold and a C-terminal DYW motif, with catalytic and structural zinc atoms, respectively. A conserved gating domain within the deaminase fold regulates the active site sterically and mechanistically in a process that we termed gated zinc shutter. Based on the structures, an autoinhibited ground state and its activation are cross-validated by RNA editing assays and differential scanning fluorimetry. We anticipate that, in vivo, the framework of an active plant RNA editosome triggers the release of DYW autoinhibition to ensure a controlled and coordinated cytidine deamination playing a key role in mitochondrial and chloroplast homeostasis. DYW domain structures imply an unusual regulation principle in plant organellar RNA editing catalysis.,Takenaka M, Takenaka S, Barthel T, Frink B, Haag S, Verbitskiy D, Oldenkott B, Schallenberg-Rudinger M, Feiler CG, Weiss MS, Palm GJ, Weber G Nat Catal. 2021 Jun;4(6):510-522. doi: 10.1038/s41929-021-00633-x. Epub 2021 Jun , 21. PMID:34712911[2] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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