English Intern
Rudolf-Virchow-Zentrum - Center for Integrative and Translational Bioimaging

A new single molecule approach to study DNA repair protein dynamics: seeing is believing

Datum: 16.11.2023, 16:00 - 17:00 Uhr
Ort: Room D15.01.002/004, 1. OG Rudolf Virchow Center, Josef-Schneider-Str. 2, Building D15
Veranstalter: Rudolf-Virchow-Zentrum
Vortragende:r: Prof. Ben van Houten (University of Pittsburgh)

On November 16, 2023, a lecture by Prof. Ben van Houten on DNA repair protein dynamics will be held at 4:00 pm at the Rudolf Virchow Center for Integrative and Translational Bioimaging.

This seminar will present a new rapid and robust method for single molecule analysis of DNA binding proteins from nuclear extracts (SMADNE) of  human cells expressing a fluorescently tagged protein of interest (Schaich et al., Nucleic Acids Res. 2023 Apr 24;51(7):e39). SMADNE when combined with the LUMICKS C-trap provides unprecedented observations of DNA repair protein dynamics on damaged DNA. Over the last 18 months our group has been able to analyze the dwell times of 30 proteins or protein variants on DNA substrates using this approach. After a brief introduction to DNA damage and base excision repair, this seminar will discuss new unpublished data, including the DNA binding dynamics of PARP1 and PARP1 variants or DNA LIG3-XRCC1 on nicks in naked DNA and in a nucleosomes. An important glycosylase, TDG, involved in active oxidative demethylation of 5mC  through base excision repair will also be discussed.  Finally,  the non-specific DNA interactions and the binding behavior to 8-oxoG of purified eGFP-OGG1, purified eGFP-OGG1 added to extracts, and eGFP-OGG1 from human cell nuclear extracts  will be directly compared.

All staff and guests are cordially invited!

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