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Title: X-ray Transparent Microfluidic Chip for Mesophase-Based Crystallization of Membrane Proteins and On-Chip Structure Determination

Journal Article · · Crystal Growth and Design
DOI:https://doi.org/10.1021/cg5011488· OSTI ID:1158727
 [1];  [1];  [1];  [2];  [1]
  1. Department of Chemical & Biomolecular Engineering, University of Illinois at Urbana−Champaign, 600 South Mathews Avenue, Urbana, Illinois 61801, United States
  2. Biosciences Division, Argonne National Laboratory, Argonne, Illinois 60439, United States

Crystallization from lipidic mesophase matrices is a promising route to diffraction-quality crystals and structures of membrane proteins. The microfluidic approach reported here eliminates two bottlenecks of the standard mesophase-based crystallization protocols: (i) manual preparation of viscous mesophases and (ii) manual harvesting of often small and fragile protein crystals. In the approach reported here, protein-loaded mesophases are formulated in an X-ray transparent microfluidic chip using only 60 nL of the protein solution per crystallization trial. The X-ray transparency of the chip enables diffraction data collection from multiple crystals residing in microfluidic wells, eliminating the normally required manual harvesting and mounting of individual crystals. In addition, we validated our approach by on-chip crystallization of photosynthetic reaction center, a membrane protein from Rhodobacter sphaeroides, followed by solving its structure to a resolution of 2.5 Å using X-ray diffraction data collected on-chip under ambient conditions. A moderate conformational change in hydrophilic chains of the protein was observed when comparing the on-chip, room temperature structure with known structures for which data were acquired under cryogenic conditions.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE Advanced Research Projects Agency - Energy (ARPA-E)
Grant/Contract Number:
AC02-06CH11357; R01 GM086727
OSTI ID:
1158727
Alternate ID(s):
OSTI ID: 1225366
Journal Information:
Crystal Growth and Design, Journal Name: Crystal Growth and Design Vol. 14 Journal Issue: 10; ISSN 1528-7483
Publisher:
American Chemical SocietyCopyright Statement
Country of Publication:
France
Language:
English
Citation Metrics:
Cited by: 30 works
Citation information provided by
Web of Science

References (41)

In situ X-ray analysis of protein crystals in low-birefringent and X-ray transmissive plastic microchannels journal January 2008
From 3D cell culture to organs-on-chips journal December 2011
The plug-based nanovolume Microcapillary Protein Crystallization System (MPCS) journal October 2008
ChipX: A Novel Microfluidic Chip for Counter-Diffusion Crystallization of Biomolecules and in Situ Crystal Analysis at Room Temperature journal July 2013
A microfluidic processor for gene expression profiling of single human embryonic stem cells journal January 2008
Nonlinear Optical Imaging of Integral Membrane Protein Crystals in Lipidic Mesophases journal January 2010
Controlled In Meso Phase Crystallization – A Method for the Structural Investigation of Membrane Proteins journal April 2012
Radiation damage in macromolecular crystallography: what is it and why should we care? journal March 2010
Lipidic cubic phase injector facilitates membrane protein serial femtosecond crystallography journal February 2014
How root-mean-square distance (r.m.s.d.) values depend on the resolution of protein structures that are compared journal January 2003
Microfluidic chips for the crystallization of biomacromolecules by counter-diffusion and on-chip crystal X-ray analysis journal January 2009
Toward on-chip X-ray analysis journal January 2005
From screen to structure with a harvestable microfluidic device journal July 2011
Chaotic Mixer for Microchannels journal January 2002
Fabrication of X-ray compatible microfluidic platforms for protein crystallization journal November 2012
Microfluidics for drug discovery and development: From target selection to product lifecycle management journal January 2008
A microfluidic approach for protein structure determination at room temperature via on-chip anomalous diffraction journal January 2013
Laue Crystallography for Studying Rapid Reactions journal October 1994
Recent Progress in the Structure Determination of GPCRs, a Membrane Protein Family with High Potential as Pharmaceutical Targets book January 2010
Integrated microfluidic reactors journal December 2009
Diversity and modularity of G protein-coupled receptor structures journal January 2012
From Macrofluidics to Microfluidics for the Crystallization of Biological Macromolecules journal November 2007
Chapter 4 Monoacylglycerols book January 2009
Pros and cons of cryocrystallography: should we also collect a room-temperature data set? journal December 2004
X-ray microfocussing combined with microfluidics for on-chip X-ray scattering measurements journal January 2006
Behavior of capillary valves in centrifugal microfluidic devices prepared by three-dimensional printing journal November 2010
How many drug targets are there? journal December 2006
Two-layer multiplexed peristaltic pumps for high-density integrated microfluidics journal January 2011
Lipidic cubic phase technologies for membrane protein structural studies journal August 2011
Crystallizing membrane proteins using lipidic mesophases journal April 2009
Monoolein Lipid Phases as Incorporation and Enrichment Materials for Membrane Protein Crystallization journal August 2011
Room to Move: Crystallizing Membrane Proteins in Swollen Lipidic Mesophases journal April 2006
From The Cover: Systematic investigation of protein phase behavior with a microfluidic formulator journal September 2004
Shear Rheology of Lyotropic Liquid Crystals: A Case Study journal April 2005
X-CHIP: an integrated platform for high-throughput protein crystallization and on-the-chip X-ray diffraction data collection journal May 2011
Lipidic Sponge Phase Crystallization of Membrane Proteins journal November 2006
Accessing protein conformational ensembles using room-temperature X-ray crystallography journal September 2011
A robotic system for crystallizing membrane and soluble proteins in lipidic mesophases journal September 2004
Serial Femtosecond Crystallography of G Protein-Coupled Receptors journal December 2013
Lipidic Cubic Phase Crystal Structure of the Photosynthetic Reaction Centre from Rhodobacter sphaeroides at 2.35Å Resolution journal August 2003
A plug-based microfluidic system for dispensing lipidic cubic phase (LCP) material validated by crystallizing membrane proteins in lipidic mesophases journal October 2009