New insights into the GINS complex explain the controversy between existing structural models

Marta Carroni, Matteo De March, Barbara Medagli, Ivet Krastanova, Ian A. Taylor, Heinz Amenitsch, Hiroyuchi Araki, Francesca M. Pisani, Ardan Patwardhan, Silvia Onesti*

*Korrespondierende/r Autor/in für diese Arbeit

Publikation: Beitrag in einer FachzeitschriftArtikel

Abstract

GINS is a key component of eukaryotic replicative forks and is composed of four subunits (Sld5, Psf1, Psf2, Psf3). To explain the discrepancy between structural data from crystallography and electron microscopy (EM), we show that GINS is a compact tetramer in solution as observed in crystal structures, but also forms a double-tetrameric population, detectable by EM. This may represent an intermediate step towards the assembly of two replicative helicase complexes at origins, moving in opposite directions within the replication bubble. Reconstruction of the double-tetrameric form, combined with small-angle X-ray scattering data, allows the localisation of the B domain of the Psf1 subunit in the free GINS complex, which was not visible in previous studies and is essential for the formation of a functional replication fork.

Originalspracheenglisch
Aufsatznummer40188
FachzeitschriftScientific Reports
Jahrgang7
DOIs
PublikationsstatusVeröffentlicht - 10 Jan 2017

ASJC Scopus subject areas

  • Allgemein
  • !!Materials Science(all)

Fields of Expertise

  • Human- & Biotechnology

Treatment code (Nähere Zuordnung)

  • Basic - Fundamental (Grundlagenforschung)
  • Experimental

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  • Dieses zitieren

    Carroni, M., De March, M., Medagli, B., Krastanova, I., Taylor, I. A., Amenitsch, H., ... Onesti, S. (2017). New insights into the GINS complex explain the controversy between existing structural models. Scientific Reports, 7, [40188]. https://doi.org/10.1038/srep40188