Recognition of mono-ADP-ribosylated ARTD10 substrates by ARTD8 macrodomains.

Forst AH, Karlberg T, Herzog N, Thorsell AG, Gross A, Feijs KL, Verheugd P, Kursula P, Nijmeijer B, Kremmer E, Kleine H, Ladurner AG, Schüler H, Lüscher B

Structure 21 (3) 462-475 [2013-03-05; online 2013-03-12]

ADP-ribosyltransferases (ARTs) catalyze the transfer of ADP-ribose from NAD(+) onto substrates. Some ARTs generate in an iterative process ADP-ribose polymers that serve as adaptors for distinct protein domains. Other ARTs, exemplified by ARTD10, function as mono-ADP-ribosyltransferases, but it has been unclear whether this modification occurs in cells and how it is read. We observed that ARTD10 colocalized with ARTD8 and defined its macrodomains 2 and 3 as readers of mono-ADP-ribosylation both in vitro and in cells. The crystal structures of these two ARTD8 macrodomains and isothermal titration calorimetry confirmed their interaction with ADP-ribose. These macrodomains recognized mono-ADP-ribosylated ARTD10, but not poly-ADP-ribosylated ARTD1. This distinguished them from the macrodomain of macroH2A1.1, which interacted with poly- but not mono-ADP-ribosylated substrates. Moreover, Ran, an ARTD10 substrate, was also read by ARTD8 macrodomains. This identifies readers of mono-ADP-ribosylated proteins, defines their structures, and demonstrates the presence of this modification in cells.

Protein Science Facility (PSF)

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PubMed 23473667

DOI 10.1016/j.str.2012.12.019

Crossref 10.1016/j.str.2012.12.019

pii: S0969-2126(13)00019-1
PDB: 3Q6Z
PDB: 3Q71
PDB: 3V2B
PDB: 3VFQ
PDB: 4ABK
PDB: 4ABL
PDB: 4D86