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PXII - X10SA: Macromolecular Crystallography

Beamline for protein crystallography

The second beamline for protein crystallography (PX) has been jointly funded by the Max Planck Society (MPG) and the pharmaceutical companies Novartis and Hoffmann La Roche in 2005. It is a highly versatile PX beamline with good compromise of small X-ray focus and low divergence, making it suitable for the high-throughput data collection of our pharmaceutical partners as well as the high-impact academic research performed by the MPG. After more than ten years of operation and more than 1500 structures deposited to the PDB, with some ten thousand proprietary structures solved, we recently took on four more partners: Boehringer Ingelheim, Proteros, LeadXpro and SAI. These partners and the Paul Scherrer Institut are therefore the principal users of this facility. The design and construction of beam line X10SA (PXII) is based on the highly successful first beam line X06SA (PXI) and is particularly suited for large unit cells and small crystals. In 2017 we introduce a novel approach for fast micro-focusing using X-ray lenses, giving users the ability to use a true micro-beam on-demand.

As an option that can be applied for by all users, crystallographic data collection can be complemented by optical spectroscopy with an on-axis microspectrophotometer (c.f. R. Pompidor et al., JSR, (2013), 20, p765).

Beamline Characteristics

Wavelength range (Å) 0.62 - 2.07
Spectral range (keV) 6.0 - 20.0
Energy resolution (%) <0.02
Flux at 12.4 keV at 400mA (ph/s) >2 x 1012
Focused spot size h x v (μm²) 73x16 / 30x16 / 10x10
Detector PILATUS 6M (25 Hz)

Beamline Features

Fast On-Demand Beam Shaping

  • Using apertures (150μm; 30μm; 10μm)
  • Beam size selection while sample is already mounted (<5 sec)

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Beamsizes X10SA Feb 2016


On-axis in-situ Micro-Spectrophotometry

  • Permanently installed on-axis micro-spectrophotometer
  • big portfolio of excitation Lasers
  • Possible techniques:
    • UV/Vis
    • Raman
    • Resonant Raman
    • Fluorescence

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Beamspots of the Micro-Photospectrometer X10SA