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Title: Structural studies of P-type ATPase–ligand complexes using an X-ray free-electron laser

Journal Article · · IUCrJ
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  1. Aarhus Univ., Aarhus (Denmark)
  2. Max Planck Institute for Medical Research, Heidelberg (Germany)
  3. Rutherford Appleton Lab., Didcot (England)
  4. Max Planck Institute for Medical Research, Heidelberg (Germany); Arizona State Univ., Tempe, AZ (United States)
  5. SLAC National Accelerator Lab., Menlo Park, CA (United States)
  6. Univ. of Copenhagen, Copenhagen (Denmark)

Membrane proteins are key players in biological systems, mediating signalling events and the specific transport ofe.g.ions and metabolites. Consequently, membrane proteins are targeted by a large number of currently approved drugs. Understanding their functions and molecular mechanisms is greatly dependent on structural information, not least on complexes with functionally or medically important ligands. Structure determination, however, is hampered by the difficulty of obtaining well diffracting, macroscopic crystals. Here, the feasibility of X-ray free-electron-laser-based serial femtosecond crystallography (SFX) for the structure determination of membrane protein–ligand complexes using microcrystals of various native-source and recombinant P-type ATPase complexes is demonstrated. The data reveal the binding sites of a variety of ligands, including lipids and inhibitors such as the hallmark P-type ATPase inhibitor orthovanadate. By analyzing the resolution dependence of ligand densities and overall model qualities, SFX data quality metrics as well as suitable refinement procedures are discussed. Even at relatively low resolution and multiplicity, the identification of ligands can be demonstrated. This makes SFX a useful tool for ligand screening and thus for unravelling the molecular mechanisms of biologically active proteins.

Research Organization:
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Contributing Organization:
Parts of this research were carried out at the LCLS, a National User Facility operated by Stanford University on behalf of the US Department of Energy (DOE), Office of Basic Energy Sciences (OBES). The CXI instrument was funded by the LCLS Ultrafast Science Instruments (LUSI) project funded by DOE, OBES.
Grant/Contract Number:
AC03-76SF00515
OSTI ID:
1208835
Journal Information:
IUCrJ, Vol. 2, Issue 4; ISSN 2052-2525
Publisher:
International Union of CrystallographyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 18 works
Citation information provided by
Web of Science

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Watching proteins function with time-resolved x-ray crystallography journal August 2017
Redox-coupled structural changes in nitrite reductase revealed by serial femtosecond and microfocus crystallography journal January 2016
X-ray free-electron laser: opportunities for drug discovery journal July 2018
Membrane-protein crystals for neutron diffraction journal November 2018
Structural Changes of Sarco/Endoplasmic Reticulum Ca2+-ATPase Induced by Rutin Arachidonate: A Molecular Dynamics Study journal February 2020
X-ray free electron laser: opportunities for drug discovery journal November 2017
Atomic resolution structure of serine protease proteinase K at ambient temperature posted_content February 2017
Membrane-protein crystals for neutron diffraction text January 2018