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Instruments / Technical Area	Publication Details	Published	Actions
I24-Microfocus Macromolecular Crystallography	An on-demand, drop-on-drop method for studying enzyme catalysis by serial crystallography Agata Butryn , Philipp S. Simon , Pierre Aller , Philip Hinchliffe , Ramzi N. Massad , Gabriel Leen , Catherine L. Tooke , Isabel Bogacz , In-Sik Kim , Asmit Bhowmick , Aaron S. Brewster , Nicholas E. Devenish , Jurgen Brem , Jos J. A. G. Kamps , Pauline A. Lang , Patrick Rabe , Danny Axford , John H. Beale , Bradley Davy , Ali Ebrahim , Julien Orlans , Selina L. S. Storm , Tiankun Zhou , Shigeki Owada , Rie Tanaka , Kensuke Tono , Gwyndaf Evans , Robin L. Owen , Frances A. Houle , Nicholas K. Sauter , Christopher J. Schofield , James Spencer , Vittal K. Yachandra , Junko Yano , Jan F. Kern , Allen M. Orville Nature Communications 12 DOI: 10.1038/s41467-021-24757-7 Diamond Proposal Number(s): [19458, 25260] Open Access Show Abstract ▼ Abstract: Serial femtosecond crystallography has opened up many new opportunities in structural biology. In recent years, several approaches employing light-inducible systems have emerged to enable time-resolved experiments that reveal protein dynamics at high atomic and temporal resolutions. However, very few enzymes are light-dependent, whereas macromolecules requiring ligand diffusion into an active site are ubiquitous. In this work we present a drop-on-drop sample delivery system that enables the study of enzyme-catalyzed reactions in microcrystal slurries. The system delivers ligand solutions in bursts of multiple picoliter-sized drops on top of a larger crystal-containing drop inducing turbulent mixing and transports the mixture to the X-ray interaction region with temporal resolution. We demonstrate mixing using fluorescent dyes, numerical simulations and time-resolved serial femtosecond crystallography, which show rapid ligand diffusion through microdroplets. The drop-on-drop method has the potential to be widely applicable to serial crystallography studies, particularly of enzyme reactions with small molecule substrates.	Jul 2021

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I24-Microfocus Macromolecular Crystallography

An on-demand, drop-on-drop method for studying enzyme catalysis by serial crystallography