Flexible segments modulate co-folding of dUTPase and nucleocapsid proteins

Veronika Németh-Pongrácz, Orsolya Barabás, Mónika Fuxreiter, István Simon, Iva Pichová, Michalea Rumlová, Helena Zábranská, Dmitri Svergun, Maxim Petoukhov, Veronika Harmat, Éva Klement, Éva Hunyadi-Gulyás, Katalin F. Medzihradszky, Emese Kónya, Beáta G. Vértessy

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The homotrimeric fusion protein nucleocapsid (NC)-dUTPase combines domains that participate in RNA/DNA folding, reverse transcription, and DNA repair in Mason-Pfizer monkey betaretrovirus infected cells. The structural organization of the fusion protein remained obscured by the N- and C-terminal flexible segments of dUTPase and the linker region connecting the two domains that are invisible in electron density maps. Small-angle X-ray scattering reveals that upon oligonucleotide binding the NC domains adopt the trimeric symmetry of dUTPase. High-resolution X-ray structures together with molecular modeling indicate that fusion with NC domains dramatically alters the conformation of the flexible C-terminus by perturbing the orientation of a critical β-strand. Consequently, the C-terminal segment is capable of double backing upon the active site of its own monomer and stabilized by non-covalent interactions formed with the N-terminal segment. This co-folding of the dUTPase terminal segments, not observable in other homologous enzymes, is due to the presence of the fused NC domain. Structural and genomic advantages of fusing the NC domain to a shortened dUTPase in betaretroviruses and the possible physiological consequences are envisaged.

Original languageEnglish
Pages (from-to)495-505
Number of pages11
JournalNucleic acids research
Issue number2
Publication statusPublished - Jan 1 2007


ASJC Scopus subject areas

  • Genetics

Cite this

Németh-Pongrácz, V., Barabás, O., Fuxreiter, M., Simon, I., Pichová, I., Rumlová, M., Zábranská, H., Svergun, D., Petoukhov, M., Harmat, V., Klement, É., Hunyadi-Gulyás, É., Medzihradszky, K. F., Kónya, E., & Vértessy, B. G. (2007). Flexible segments modulate co-folding of dUTPase and nucleocapsid proteins. Nucleic acids research, 35(2), 495-505. https://doi.org/10.1093/nar/gkl1074