Initial primer synthesis of a DNA primase monitored by real-time NMR spectroscopy

Primases are crucial enzymes for DNA replication, as they synthesize a short primer required for initiating DNA replication. We herein present time-resolved nuclear magnetic resonance (NMR) spectroscopy in solution and in the solid state to study the initial dinucleotide formation reaction of archaeal pRN1 primase. Our findings show that the helix-bundle domain (HBD) of pRN1 primase prepares the two substrates and then hands them over to the catalytic domain to initiate the reaction. By using nucleotide triphosphate analogues, the reaction is substantially slowed down, allowing us to study the initial dinucleotide formation in real time. We show that the sedimented protein–DNA complex remains active in the solid-state NMR rotor and that time-resolved 31P-detected cross-polarization experiments allow monitoring the kinetics of dinucleotide formation. The kinetics in the sedimented protein sample are comparable to those determined by solution-state NMR. Protein conformational changes during primer synthesis are observed in time-resolved 1H-detected experiments at fast magic-angle spinning frequencies (100 kHz). A significant number of spectral changes cluster in the HBD pointing to the importance of the HBD for positioning the nucleotides and the dinucleotide.

Schlagwörter

Fachgebiet (DDC)

500 - Naturwissenschaften und Mathematik

Projekt

Veranstaltung

Startdatum der Ausstellung

Enddatum der Ausstellung

Startdatum der Konferenz

Enddatum der Konferenz

Datum der letzten Prüfung

ISBN

ISSN

0002-7863
1520-5126

Sprache

Englisch

Während FHNW Zugehörigkeit erstellt

Ja

Zukunftsfelder FHNW

Publikationsstatus

Unveröffentlicht

Begutachtung

Peer-Review der ganzen Publikation

Open Access-Status

Hybrid

Lizenz

Zitation

WU, Pengzhi, Johannes ZEHNDER, Nina SCHRÖDER, Pascal E. W. BLÜMMEL, Loïc SALMON, Fred. F. DAMBERGER, Georg LIPPS, Frédéric H.-T. ALLAIN und Thomas WIEGAND, 2024. Initial primer synthesis of a DNA primase monitored by real-time NMR spectroscopy. Journal of the American Chemical Society. 27 März 2024. Bd. 146, Nr. 14, S. 9583–9596. DOI 10.1021/jacs.3c11836. Verfügbar unter: https://doi.org/10.26041/fhnw-11917

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