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Title: Structure and two-metal mechanism of a eukaryal nick-sealing RNA ligase

Journal Article · · Proceedings of the National Academy of Sciences of the United States of America

ATP-dependent RNA ligases are agents of RNA repair that join 3'-OH and 5'-PO4RNA ends.Naegleria gruberiRNA ligase (NgrRnl) exemplifies a family of RNA nick-sealing enzymes found in bacteria, viruses, and eukarya. Crystal structures of NgrRnl at three discrete steps along the reaction pathway—covalent ligase-(lysyl-Nζ)–AMP•Mn2+intermediate; ligase•ATP•(Mn2+)2Michaelis complex; and ligase•Mn2+complex—highlight a two-metal mechanism of nucleotidyl transfer, whereby (i) an enzyme-bound “catalytic” metal coordination complex lowers the pKaof the lysine nucleophile and stabilizes the transition state of the ATP α phosphate; and (ii) a second metal coordination complex bridges the β- and γ-phosphates. The NgrRnl N domain is a distinctively embellished oligonucleotide-binding (OB) fold that engages the γ-phosphate and associated metal complex and orients the pyrophosphate leaving group for in-line catalysis with stereochemical inversion at the AMP phosphate. The unique domain architecture of NgrRnl fortifies the theme that RNA ligases have evolved many times, and independently, by fusions of a shared nucleotidyltransferase domain to structurally diverse flanking modules. In conclusion, the mechanistic insights to lysine adenylylation gained from the NgrRnl structures are likely to apply broadly to the covalent nucleotidyltransferase superfamily of RNA ligases, DNA ligases, and RNA capping enzymes.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
National Inst. of Health; Memorial Sloan Kettering Cancer Center
Grant/Contract Number:
GM42498; P30-CA008748
OSTI ID:
1226368
Journal Information:
Proceedings of the National Academy of Sciences of the United States of America, Vol. 112, Issue 45; ISSN 0027-8424
Publisher:
National Academy of SciencesCopyright Statement
Country of Publication:
United States
Language:
ENGLISH
Citation Metrics:
Cited by: 18 works
Citation information provided by
Web of Science

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Cited By (7)

Structure and two-metal mechanism of fungal tRNA ligase journal December 2018
Structural intermediates of a DNA–ligase complex illuminate the role of the catalytic metal ion and mechanism of phosphodiester bond formation journal July 2019
Structure of the error-prone DNA ligase of African swine fever virus identifies critical active site residues journal January 2019
RNA damage in biological conflicts and the diversity of responding RNA repair systems journal August 2016
High-throughput sequencing reveals circular substrates for an archaeal RNA ligase journal August 2016
Structures of DNA-bound human ligase IV catalytic core reveal insights into substrate binding and catalysis journal July 2018
Structures of ATP-bound DNA ligase D in a closed domain conformation reveal a network of amino acid and metal contacts to the ATP phosphates journal February 2019