Crystal structure of Arabidopsis thaliana cytidine deaminase
release_rev_d97de6cf-fc8f-43f0-bd52-425b157c41ed
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Jia Wang, Qi Guo, Lin Liu, Xiao Wang
2020 Volume 529, Issue 3, p659-665
Abstract
Cytidine deaminase (CDA) catalyzes the (deoxy)cytidine deamination to (deoxy)uridine, which involves in the catabolic and salvage pathways of pyrimidine nucleotides in plants. CDA serves as a prototype of the cytidine deaminase superfamily that contains a number of RNA editing enzymes. Arabidopsis thaliana has only one functional CDA, AtCDA1. We solved the crystal structures of AtCDA1, which is a dimeric zinc-containing enzyme and each protomer consists of an N-terminal zinc-binding catalytic domain and a C-terminal non-catalytic domain. Both domains adopt a typical α/β/α sandwich fold. In vitro biochemical assays showed that the ribose moiety of cytidine is required for ligand binding, and structural analyses revealed a conserved catalytic mechanism is adopted by AtCDA1.
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