Structural analyses of NudT16-ADP-ribose complexes direct rational design of mutants with improved processing of poly(ADP-ribosyl)ated proteins.Thirawatananond, P., McPherson, R.L., Malhi, J., Nathan, S., Lambrecht, M.J., Brichacek, M., Hergenrother, P.J., Leung, A.K.L., Gabelli, S.B.
(2019) Sci Rep 9: 5940-5940
- PubMed: 30976021
- DOI: 10.1038/s41598-019-39491-w
- Primary Citation of Related Structures:
5W6X, 5W6Z, 5VY2, 5WJI, 6B09
- PubMed Abstract:
ADP-ribosylation is a post-translational modification that occurs on chemically diverse amino acids, including aspartate, glutamate, lysine, arginine, serine and cysteine on proteins and is mediated by ADP-ribosyltransferases, including a subset commonly known as poly(ADP-ribose) polymerases ...
ADP-ribosylation is a post-translational modification that occurs on chemically diverse amino acids, including aspartate, glutamate, lysine, arginine, serine and cysteine on proteins and is mediated by ADP-ribosyltransferases, including a subset commonly known as poly(ADP-ribose) polymerases. ADP-ribose can be conjugated to proteins singly as a monomer or in polymeric chains as poly(ADP-ribose). While ADP-ribosylation can be reversed by ADP-ribosylhydrolases, this protein modification can also be processed to phosphoribosylation by enzymes possessing phosphodiesterase activity, such as snake venom phosphodiesterase, mammalian ectonucleotide pyrophosphatase/phosphodiesterase 1, Escherichia coli RppH, Legionella pneumophila Sde and Homo sapiens NudT16 (HsNudT16). Our studies here sought to utilize X-ray crystallographic structures of HsNudT16 in complex with monomeric and dimeric ADP-ribose in identifying the active site for binding and processing free and protein-conjugated ADP-ribose into phosphoribose forms. These structural data guide rational design of mutants that widen the active site to better accommodate protein-conjugated ADP-ribose. We identified that several HsNudT16 mutants (Δ17, F36A, and F61S) have reduced activity for free ADP-ribose, similar processing ability against protein-conjugated mono(ADP-ribose), but improved catalytic efficiency for protein-conjugated poly(ADP-ribose). These HsNudT16 variants may, therefore, provide a novel tool to investigate different forms of ADP-ribose.
Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, MD, 21205, USA. email@example.com.