Quantifying the heterogeneity of macromolecular machines by mass photometry

Abstract: Sample purity is central to in vitro studies of protein function and regulation, and to the efficiency and success of structural studies using techniques such as x-ray crystallography and cryo-electron microscopy (cryo-EM). Here, we show that mass photometry (MP) can accurately characterize the heterogeneity of a sample using minimal material with high resolution within a matter of minutes. To benchmark our approach, we use negative stain electron microscopy (nsEM), a popular method for EM sample screening. We include typical workflows developed for structure determination that involve multi-step purification of a multi-subunit ubiquitin ligase and chemical cross-linking steps. When assessing the integrity and stability of large molecular complexes such as the proteasome, we detect and quantify assemblies invisible to nsEM. Our results illustrate the unique advantages of MP over current methods for rapid sample characterization, prioritization and workflow optimization

Standort
Deutsche Nationalbibliothek Frankfurt am Main
Umfang
Online-Ressource
Sprache
Englisch
Anmerkungen
Nature communications. - 11 (2020) , 1772, ISSN: 2041-1723

Ereignis
Veröffentlichung
(wo)
Freiburg
(wer)
Universität
(wann)
2020
Urheber
Sonn-Segev, Adar
Belacic, Katarina
Bodrug, Tatyana
Young, Gavin
VanderLinden, Ryan T.
Schulman, Brenda A.
Schimpf, Johannes
Friedrich, Thorsten
Dip, Phat Vinh
Schwartz, Thomas
Bauer, Benedikt
Peters, Jan-Michael
Struwe, Weston B.
Benesch, Justin L. P.
Brown, Nicholas G.
Haselbach, David
Kukura, Philipp
Beteiligte Personen und Organisationen
Institute of Biochemistry, Molecular Bioenergetics

DOI
10.1038/s41467-020-15642-w
URN
urn:nbn:de:bsz:25-freidok-1741366
Rechteinformation
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Letzte Aktualisierung
14.08.2025, 10:44 MESZ

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Beteiligte

Entstanden

  • 2020

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