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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:1393969

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. 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)
Sponsoring Organization:
USDOE Advanced Research Projects Agency - Energy (ARPA-E)
DOE Contract Number:
AC02-06CH11357
OSTI ID:
1393969
Journal Information:
Crystal Growth and Design, Journal Name: Crystal Growth and Design Journal Issue: 10 Vol. 14; ISSN 1528-7483
Publisher:
American Chemical Society
Country of Publication:
United States
Language:
English

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Cited By (11)

Microfluidics: From crystallization to serial time-resolved crystallography journal May 2017
A simple and versatile microfluidic device for efficient biomacromolecule crystallization and structural analysis by serial crystallography text January 2019
X-ray transparent microfluidic platforms for membrane protein crystallization with microseeds journal January 2018
Graphene-based microfluidics for serial crystallography journal January 2016
High-throughput in situ X-ray screening of and data collection from protein crystals at room temperature and under cryogenic conditions journal January 2018
Lipidic cubic phase serial millisecond crystallography using synchrotron radiation journal March 2015
Lipidic cubic phase serial millisecond crystallography using synchrotron radiation text January 2015
Self-assembled materials and supramolecular chemistry within microfluidic environments: from common thermodynamic states to non-equilibrium structures journal January 2018
A Versatile System for High-Throughput In Situ X-ray Screening and Data Collection of Soluble and Membrane-Protein Crystals journal October 2016
A simple and versatile microfluidic device for efficient biomacromolecule crystallization and structural analysis by serial crystallography journal April 2019
A high-transparency, micro-patternable chip for X-ray diffraction analysis of microcrystals under native growth conditions journal September 2015

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