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Title: Incorporation and Assembly of a Light-Emitting Enzymatic Reaction into Model Protein Condensates

Journal Article · · Biochemistry

Eukaryotic cells partition enzymes and other cellular components into distinct subcellular compartments to generate specialized biochemical niches. A subclass of these compartments form in the absence of lipid membranes, via liquid-liquid phase separation of proteins to form biomolecular condensates or “membraneless organelles” such as nucleoli, stress granules, and P-bodies. Because of their ability to form compartments from simple starting materials, membraneless organelles are an attractive target for engineering new functionalities in both living cells and protocells. In this work, we demonstrate incorporation of novel enzymatic activity in protein coacervates with a light-generating enzyme, NanoLuc, to produce bioluminescence. Using condensates comprised of the disordered RGG domain of C. elegans LAF-1, we show functionalization of condensates with enzymatic activity in vitro and that localization to protein coacervates enhances the assembly and activity of split enzymes. To build condensates that function as light emitting reactors, we designed a NanoLuc enzyme flanked by RGG domains. Furthermore, the resulting condensates concentrated NanoLuc by 10-fold over bulk solution and display significantly increased net reaction rates. We further show that condensate viscosity impacts light emission due to diffusion-limited behavior. By splitting NanoLuc enzyme into its constituent components, we demonstrate that NanoLuc activity can be reconstituted via co-condensation. Further, we demonstrate control of the spatial localization of enzyme within condensates by targettng NanoLuc to the surface of in vitro condensates. Collectively, this work demonstrates that membraneless organelles can be endowed with localized enzymatic activity, and that this activity can be spatially and temporally controlled via enzyme reconstitution and design of protein surfactants.

Research Organization:
Univ. of Pennsylvania, Philadelphia, PA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0007063
OSTI ID:
1899602
Journal Information:
Biochemistry, Vol. 60, Issue 42; ISSN 0006-2960
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English

References (66)

NanoLuc Reporter for Dual Luciferase Imaging in Living Animals journal October 2013
Phase Separation by Low Complexity Domains Promotes Stress Granule Assembly and Drives Pathological Fibrillization journal September 2015
Combining fluorescence and bioluminescence microscopy journal June 2015
A condensate-hardening drug blocks RSV replication in vivo journal July 2021
Protein Phase Separation: A New Phase in Cell Biology journal June 2018
Biomolecular Condensates: Sequence Determinants of Phase Separation, Microstructural Organization, Enzymatic Activity, and Material Properties journal March 2021
Video rate bioluminescence imaging of secretory proteins in living cells: Localization, secretory frequency, and quantification journal August 2011
Historical Development of Origins Research journal June 2010
mTOR Regulates Phase Separation of PGL Granules to Modulate Their Autophagic Degradation journal September 2018
In vitro gene expression within membrane-free coacervate protocells journal January 2015
Spatiotemporal control of coacervate formation within liposomes journal April 2019
SPLIT: Stable Protein Coacervation Using a Light Induced Transition journal February 2020
Phase behaviour of disordered proteins underlying low density and high permeability of liquid organelles journal June 2017
Visualizing protein partnerships in living cells and organisms journal December 2011
Principles and Properties of Stress Granules journal September 2016
Stabilization and enhanced reactivity of actinorhodin polyketide synthase minimal complex in polymer–nucleotide coacervate droplets journal January 2012
Controllable protein phase separation and modular recruitment to form responsive membraneless organelles journal July 2018
ALS/FTD Mutation-Induced Phase Transition of FUS Liquid Droplets and Reversible Hydrogels into Irreversible Hydrogels Impairs RNP Granule Function journal November 2015
Engineered Regulatory Systems Modulate Gene Expression of Human Commensals in the Gut journal April 2017
Active liquid-like behavior of nucleoli determines their size and shape in Xenopus laevis oocytes journal February 2011
Tar DNA Binding Protein-43 (TDP-43) Associates with Stress Granules: Analysis of Cultured Cells and Pathological Brain Tissue journal October 2010
Identifying sequence perturbations to an intrinsically disordered protein that determine its phase-separation behavior journal May 2020
Kinetics of regulated protein-protein interactions revealed with firefly luciferase complementation imaging in cells and living animals journal July 2004
Biomolecular condensates pique drug discovery curiosity journal April 2019
Surface tension and viscosity of protein condensates quantified by micropipette aspiration journal September 2021
On the Enzymic Activity of Subtilisin-Modified Ribonuclease journal February 1958
Five colour variants of bright luminescent protein for real-time multicolour bioimaging journal December 2016
Liquid-Liquid Phase Separation in Biology journal October 2014
Polyubiquitin chain-induced p62 phase separation drives autophagic cargo segregation journal March 2018
Mutations in prion-like domains in hnRNPA2B1 and hnRNPA1 cause multisystem proteinopathy and ALS journal March 2013
The multifunctional nucleolus
  • Boisvert, François-Michel; van Koningsbruggen, Silvana; Navascués, Joaquín
  • Nature Reviews Molecular Cell Biology, Vol. 8, Issue 7 https://doi.org/10.1038/nrm2184
journal July 2007
Cellular Bioluminescence Imaging journal August 2012
NanoLuc Complementation Reporter Optimized for Accurate Measurement of Protein Interactions in Cells journal December 2015
Germline P Granules Are Liquid Droplets That Localize by Controlled Dissolution/Condensation journal May 2009
Drugs enter a liquid phase journal June 2020
De novo engineering of intracellular condensates using artificial disordered proteins journal August 2020
Liquid phase condensation in cell physiology and disease journal September 2017
Polymer physics of intracellular phase transitions journal November 2015
SYNZIP Protein Interaction Toolbox: in Vitro and in Vivo Specifications of Heterospecific Coiled-Coil Interaction Domains journal February 2012
Transient Sequestration of TORC1 into Stress Granules during Heat Stress journal July 2012
Designer membraneless organelles sequester native factors for control of cell behavior journal August 2021
Coactivator condensation at super-enhancers links phase separation and gene control journal June 2018
Compartmentalised RNA catalysis in membrane-free coacervate protocells journal September 2018
NanoBRET—A Novel BRET Platform for the Analysis of Protein–Protein Interactions journal June 2015
Complex microparticle architectures from stimuli-responsive intrinsically disordered proteins journal March 2020
Geometrical optics calculation of inelastic scattering on large particles journal January 1999
Engineered Luciferase Reporter from a Deep Sea Shrimp Utilizing a Novel Imidazopyrazinone Substrate journal August 2012
Designer membraneless organelles enable codon reassignment of selected mRNAs in eukaryotes journal March 2019
Coexisting Liquid Phases Underlie Nucleolar Subcompartments journal June 2016
In Retrospect: The Origin of Life journal November 2012
Phase separation of signaling molecules promotes T cell receptor signal transduction journal April 2016
Modular platform for low-light microscopy journal January 2015
Coilin-dependent snRNP assembly is essential for zebrafish embryogenesis journal March 2010
The disordered P granule protein LAF-1 drives phase separation into droplets with tunable viscosity and dynamics journal May 2015
A framework for understanding the functions of biomolecular condensates across scales journal November 2020
RNA catalysis through compartmentalization journal October 2012
Liquid droplet formation by HP1α suggests a role for phase separation in heterochromatin journal June 2017
Phase separation drives heterochromatin domain formation journal June 2017
Biomolecular condensates: organizers of cellular biochemistry journal February 2017
Dual Specificity Kinase DYRK3 Couples Stress Granule Condensation/Dissolution to mTORC1 Signaling journal February 2013
Detection efficiency in total internal reflection fluorescence microscopy journal January 2008
Light-based control of metabolic flux through assembly of synthetic organelles journal May 2019
A Liquid-to-Solid Phase Transition of the ALS Protein FUS Accelerated by Disease Mutation journal August 2015
mRNP granules: Assembly, function, and connections with disease journal August 2014
Programming molecular self-assembly of intrinsically disordered proteins containing sequences of low complexity journal January 2017
Enhancement of soluble protein expression through the use of fusion tags journal August 2006