Sibyls: Structurally-Integrated Biology for Life Sciences

The SIBYLS beamline at the ALS

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The Beamline
Sibyls Design

SAXS experiments

Single Crystal X-ray

Beamline 12.3.1

Overview

Our LBL X-ray beamline is called Sibyls - for Structurally-Integrated BiologY for Life Sciences. The Sibyls mission is high-impact insights, not high throughput numbers.

The Sibyls beamline (Beamline 12.3.1) is located at the Advanced Light Source at the Lawrence Berkeley National Laboratory in Berkeley, California USA. The Sibyls beamline has two interchangeable endstations, one for macromolecular crystallography and one for small angle X-ray scattering (SAXS). For technical information and instructions to apply for beamtime go to the Beamline 12.3.1 homepage.

Key ideas are:

  1. prediction rather than description, and
  2. interpretation depends upon asking good questions

Sibyls would give answers whose value depended upon good questions - unlike prophets who tell you things you have not asked about.

The three sibyls from Michelangelo's Sistine Chapel (below) represent the three key aspects of the beamline.

The Delphic Sibyl highlights the ability to use x-ray scattering in solution to look at continuous events scrolled out in time.

Details of SAXS experiments.
The Erythræan Sibyl illustrates photons as a source of prediction, not just description, as an aim of the program. By choosing given conditions we can jump to future time steps like turning many pages at once.

Details of high resolution x-ray crystallographic experiments at tunable wavelengths.
The Libyan Sibyl emphasizes the importance of motion and dynamics in understanding and prediction, embodied in the movements of the sibyl herself.

Details of low resoution experiments.


Advantages of applying SAXS and crystallography to biological questions

Small angle X-ray scattering (SAXS) and macromolecular X-ray crystallography are conceptually simple but require technically sophisticated analyses that together can provide paradigm-shifting results for systems of exceptional biological interest. Crystallography supplies unparalleled detail on structural information critical for mechanistic analyses; however, it is restricted to describing low energy conformations of macromolecules within crystal lattices. SAXS offers complementary information about flexible configurations and assemblies in solution, albeit at the lower resolution range of about 50 to 10 Angstrom resolution, but without the size limitations inherent in NMR and electron microscopy studies. With advances in synchrotron facilities and computational methods, these paired X-ray techniques can create the complete and accurate images of macromolecules in solution frequently required to address critical structural questions in biology. SAXS, crystallography, and computation together allow multi-scale modeling and fundamental insights on allosteric mechanisms, self-assemblies, supramolecular complexes, and dynamic molecular machines acting in diverse processes ranging from eukaryotic DNA replication, recombination and repair to microbial membrane secretion and assembly systems.

Related Projects: The SBDR Project and the Maggie Project

Infomation about our NCI Structural Cell Biology of DNA Repair Machines (SBDR) Program Project.
Infomation about our Genomics GTL DOE Molecular Assemblies, Genes, and Genomics Integrated Efficiently.

Funding

Construction was provided by the Department of Energy OBER (DOE) and the National Institute of Health, National Cancer Insitute (NCI).
Michelangelo's sibyls images are courtesy of Carol Gerten's Fine Art http://sunsite.auc.dk/cgfa, Christus Rex http://www.christusrex.org, and the Web Gallery of Art http://gallery.euroweb.hu. Links to the Web Gallery of Art descriptions of The Delphic Sibyl, The Erythræan Sibyl, and The Libyan Sibyl.