Title: A multi-step nucleation process determines the kinetics of prion-like domain phase separation

Journal Article · · Nature Communications

Compartmentalization by liquid-liquid phase separation (LLPS) has emerged as a ubiquitous mechanism underlying the organization of biomolecules in space and time. Here, we combine rapid-mixing time-resolved small-angle X-ray scattering (SAXS) approaches to characterize the assembly kinetics of a prototypical prion-like domain with equilibrium techniques that characterize its phase boundaries and the size distribution of clusters prior to phase separation. We find two kinetic regimes on the micro- to millisecond timescale that are distinguished by the size distribution of clusters. At the nanoscale, small complexes are formed with low affinity. After initial unfavorable complex assembly, additional monomers are added with higher affinity. At the mesoscale, assembly resembles classical homogeneous nucleation. Careful multi-pronged characterization is required for the understanding of condensate assembly mechanisms and will promote understanding of how the kinetics of biological phase separation is encoded in biomolecules.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities Division
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
1810849
Journal Information:
Nature Communications, Journal Name: Nature Communications Journal Issue: 1 Vol. 12; ISSN 2041-1723
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
ENGLISH

References (74)

Quantitative Analysis of Protein Self‐Association by Sedimentation Velocity journal July 2020
Accounting for Solvent Signal Offsets in the Analysis of Interferometric Sedimentation Velocity Data: Accounting for Solvent Signal Offsets in the Analysis of Interferometric … journal May 2010
On the analysis of protein self-association by sedimentation velocity analytical ultracentrifugation journal September 2003
Size-Distribution Analysis of Macromolecules by Sedimentation Velocity Ultracentrifugation and Lamm Equation Modeling journal March 2000
α-Synuclein, Especially the Parkinson's Disease-associated Mutants, Forms Pore-like Annular and Tubular Protofibrils journal October 2002
A polymer physics perspective on driving forces and mechanisms for protein aggregation journal January 2008
Phase Separation and Single-Chain Compactness of Charged Disordered Proteins Are Strongly Correlated journal May 2017
Effects of Doxorubicin on the Liquid-Liquid Phase Change Properties of Elastin-Like Polypeptides journal October 2018
Connecting Coil-to-Globule Transitions to Full Phase Diagrams for Intrinsically Disordered Proteins journal July 2020
Phase Separation by Low Complexity Domains Promotes Stress Granule Assembly and Drives Pathological Fibrillization journal September 2015
Coexisting Liquid Phases Underlie Nucleolar Subcompartments journal June 2016
Stress-Triggered Phase Separation Is an Adaptive, Evolutionarily Tuned Response journal March 2017
Competing Protein-RNA Interaction Networks Control Multiphase Intracellular Organization journal April 2020
Condensation of Ded1p Promotes a Translational Switch from Housekeeping to Stress Protein Production journal May 2020
Microsecond Barrier-Limited Chain Collapse Observed by Time-Resolved FRET and SAXS journal May 2014
Phase Transition of a Disordered Nuage Protein Generates Environmentally Responsive Membraneless Organelles journal March 2015
Residue-by-Residue View of In Vitro FUS Granules that Bind the C-Terminal Domain of RNA Polymerase II journal October 2015
Quantifying Nucleation In Vivo Reveals the Physical Basis of Prion-like Phase Behavior journal July 2018
Protein Phase Separation: A New Phase in Cell Biology journal June 2018
Liquid–Liquid Phase Separation Is Driven by Large-Scale Conformational Unwinding and Fluctuations of Intrinsically Disordered Protein Molecules journal June 2019
Elastin-like Polypeptide Diblock Copolymers Self-Assemble into Weak Micelles journal June 2015
In Situ Measurements of Polymer Micellization Kinetics with Millisecond Temporal Resolution journal April 2019
Internal Friction Controls the Speed of Protein Folding from a Compact Configuration journal October 2004
Effect of Basic Cell-Penetrating Peptides on the Structural, Thermodynamic, and Hydrodynamic Properties of a Novel Drug Delivery Vector, ELP[V 5 G 3 A 2 -150] journal February 2014
Nucleation journal December 2010
Origin of Anomalous Mesoscopic Phases in Protein Solutions journal June 2010
Phase transitions in the assembly of multivalent signalling proteins journal March 2012
Membraneless organelles can melt nucleic acid duplexes and act as biomolecular filters journal May 2016
Molecular origins of internal friction effects on protein-folding rates journal July 2014
Biomolecular condensates: organizers of cellular biochemistry journal February 2017
From Levinthal to pathways to funnels journal January 1997
Liquid–liquid phase separation of the microtubule-binding repeats of the Alzheimer-related protein Tau journal August 2017
Measuring macromolecular size distributions and interactions at high concentrations by sedimentation velocity journal October 2018
Reentrant liquid condensate phase of proteins is stabilized by hydrophobic and non-ionic interactions journal February 2021
Liquid-like protein interactions catalyse assembly of endocytic vesicles journal April 2021
α-Synuclein aggregation nucleates through liquid–liquid phase separation journal June 2020
Selective sequestration of signalling proteins in a membraneless organelle reinforces the spatial regulation of asymmetry in Caulobacter crescentus journal January 2020
Molecular interactions underlying liquid−liquid phase separation of the FUS low-complexity domain journal July 2019
The effects of cosolutes and crowding on the kinetics of protein condensate formation based on liquid–liquid phase separation: a pressure-jump relaxation study journal October 2020
Quantitative studies of crystal nucleation at constant supersaturation: experimental data and models journal January 2014
The role of cluster formation and metastable liquid—liquid phase separation in protein crystallization journal January 2012
Internal friction in an intrinsically disordered protein—Comparing Rouse-like models with experiments journal March 2018
Microsecond acquisition of heterogeneous structure in the folding of a TIM barrel protein journal August 2008
Active liquid-like behavior of nucleoli determines their size and shape in Xenopus laevis oocytes journal February 2011
Quantifying internal friction in unfolded and intrinsically disordered proteins with single-molecule spectroscopy journal April 2012
Unmasking the roles of N- and C-terminal flanking sequences from exon 1 of huntingtin as modulators of polyglutamine aggregation journal November 2013
The disordered P granule protein LAF-1 drives phase separation into droplets with tunable viscosity and dynamics journal May 2015
RNA self-assembly contributes to stress granule formation and defining the stress granule transcriptome journal February 2018
Relation between single-molecule properties and phase behavior of intrinsically disordered proteins journal September 2018
Phosphoregulated FMRP phase separation models activity-dependent translation through bidirectional control of mRNA granule formation journal February 2019
Unfolded states under folding conditions accommodate sequence-specific conformational preferences with random coil-like dimensions journal June 2019
Clusters of bacterial RNA polymerase are biomolecular condensates that assemble through liquid–liquid phase separation journal July 2020
Amyloid  -protein (A ) assembly: A 40 and A 42 oligomerize through distinct pathways journal December 2002
Acceleration of oligomerization, not fibrillization, is a shared property of both alpha -synuclein mutations linked to early-onset Parkinson's disease: Implications for pathogenesis and therapy journal January 2000
Identification of a multienzyme complex for glucose metabolism in living cells journal June 2017
Profilin reduces aggregation and phase separation of huntingtin N-terminal fragments by preferentially binding to soluble monomers and oligomers journal January 2018
G3BP–Caprin1–USP10 complexes mediate stress granule condensation and associate with 40S subunits journal March 2016
Mechanistic insights into mammalian stress granule dynamics journal November 2016
The glycolytic enzyme phosphofructokinase-1 assembles into filaments journal June 2017
Physical principles of intracellular organization via active and passive phase transitions journal February 2018
Interplay of folded domains and the disordered low-complexity domain in mediating hnRNPA1 phase separation journal February 2021
Nuclear speckles: molecular organization, biological function and role in disease journal September 2017
ATSAS 2.1 – towards automated and web-supported small-angle scattering data analysis journal April 2007
Sub-millisecond time-resolved SAXS using a continuous-flow mixer and X-ray microbeam journal October 2013
Germline P Granules Are Liquid Droplets That Localize by Controlled Dissolution/Condensation journal May 2009
A molecular assembly phase transition and kinetic proofreading modulate Ras activation by SOS journal March 2019
Valence and patterning of aromatic residues determine the phase behavior of prion-like domains journal February 2020
Regulation of Transmembrane Signaling by Phase Separation journal May 2019
Phosphorylation of the FUS low‐complexity domain disrupts phase separation, aggregation, and toxicity journal August 2017
A single N‐terminal phosphomimic disrupts TDP‐43 polymerization, phase separation, and RNA splicing journal February 2018
Tau protein liquid–liquid phase separation can initiate tau aggregation journal February 2018
Two-Step Mechanism of Homogeneous Nucleation of Sickle Cell Hemoglobin Polymers journal August 2007
Distinct stages in stress granule assembly and disassembly journal September 2016
A first order phase transition mechanism underlies protein aggregation in mammalian cells journal February 2019

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