Activation mechanisms and inhibition of human mono-ADP-ribosyltransferases

Human ADP-ribosyltransferases, tankyrases and PARPs, catalyze a transfer of ADP-ribose from NAD+ to target proteins.

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Biocenter Oulu

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University of Oulu

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Project description

Human ADP-ribosyltransferases, tankyrases and PARPs, catalyze a transfer of ADP-ribose from NAD+ to target proteins. Structures of catalytic domains have been elucidated by protein crystallography facilitating the development of small molecule inhibitors some of which have entered the clinics. We are now reaching towards understanding how the multidomain PARPs function by addressing several key questions in they regulation through interactions with other macromolecules. We aim to elucidate the structures of macromolecular complexes at atomic resolution with protein crystallography, cryo-EM and complement this with biochemical methods. We will study structural changes during activation upon formation of macromolecular complexes and use a range of biophysical techniques to combine information into a functional models of the enzymes.

PARP complexes control key signalling events of the cell through interactions and posttranslational modifications, which modulate stability of macromolecular assemblies in the cytoplasm and in the nucleus. ADP-ribosylation signaling is often misregulated in diseases like cancer or PARPs promote proliferation and survival of cancer cells. Small molecule inhibitors interfering with the catalytic activity or with protein-protein interactions could provide new tools to and enable development of novel therapies.

Key publications

Dhakar, S.S., Galera-Prat, A. & Lehtiö, L. (2024). High-throughput screening assay for PARP-HPF1 interaction inhibitors to affect DNA damage repair. Sci. Rep. In press

Murthy, S., Nizi, M. G., Maksimainen, M.M, Massari, S., Alaviuhkola, J., Lippok, B. E., Vagaggini, C., Sowa, S. T., Galera-Prat, A., Ashok, Y., Venkannagari, H., Prunskaite-Hyyryläinen, R., Dreassi, E., Lüscher, B., Korn, P., Tabarrini, O. & Lehtiö, L. (2023). [1,2,4]Triazolo[3,4-b]benzothiazole scaffold as versatile nicotinamide mimic allowing nanomolar inhibition of different PARP enzymes. J. Med. Chem. 66:1301-1320.

Ashok, Y., Vela-Rodriguez, C., Yang, C., Alanen, H.I., Liu, F., Paschal, B.M. & Lehtiö, L. (2022). Reconstitution of the DTX3L-PARP9 complex reveals determinants for high affinity heterodimerization and multimeric assembly. Biochem. J. 479:289-304.

Obaji, E., Maksimainen M.M., Galera-Prat, A. & Lehtiö, L. (2021). Activation of ARTD2/PARP2 by DNA damage induces conformational changes relieving enzyme autoinhibition. Nat. Comm. 12:3479.