Skip to main content
U.S. Department of Energy
Office of Scientific and Technical Information

Competition between inside-out unfolding and pathogenic aggregation in an amyloid-forming β-propeller

Journal Article · · Nature Communications
Studies of folded-to-misfolded transitions using model protein systems reveal a range of unfolding needed for exposure of amyloid-prone regions for subsequent fibrillization. Here, we probe the relationship between unfolding and aggregation for glaucoma-associated myocilin. Mutations within the olfactomedin domain of myocilin (OLF) cause a gain-of-function, namely cytotoxic intracellular aggregation, which hastens disease progression. Aggregation by wild-type OLF (OLFWT) competes with its chemical unfolding, but only below the threshold where OLF loses tertiary structure. Representative moderate (OLFD380A) and severe (OLFI499F) disease variants aggregate differently, with rates comparable to OLFWT in initial stages of unfolding, and variants adopt distinct partially folded structures seen along the OLFWT urea-unfolding pathway. Whether initiated with mutation or chemical perturbation, unfolding propagates outward to the propeller surface. In sum, for this large protein prone to amyloid formation, the requirement for a conformational change to promote amyloid fibrillization leads to direct competition between unfolding and aggregation.
Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Sponsoring Organization:
National Institutes of Health (NIH); USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC02-06CH11357; W-31109-ENG-38
OSTI ID:
2470105
Journal Information:
Nature Communications, Journal Name: Nature Communications Journal Issue: 1 Vol. 15; ISSN 2041-1723
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English

References (75)

Molecular and Clinical Evaluation of a Patient Hemizygous for TIGR/MYOC journal November 2001
Common and rare myocilin variants: Predicting glaucoma pathogenicity based on genetics, clinical, and laboratory misfolding data journal June 2021
The Amber biomolecular simulation programs journal January 2005
Current developments in Coot for macromolecular model building of Electron Cryo‐microscopy and Crystallographic Data journal March 2020
qFit 3: Protein and ligand multiconformer modeling for X‐ray crystallographic and single‐particle cryo‐EM density maps journal November 2020
Calcium dysregulation potentiates wild-type myocilin misfolding: implications for glaucoma pathogenesis journal July 2022
Application of iterative soft thresholding for fast reconstruction of NMR data non-uniformly sampled with multidimensional Poisson Gap scheduling journal February 2012
CcpNmr AnalysisAssign: a flexible platform for integrated NMR analysis journal September 2016
I-PINE web server: an integrative probabilistic NMR assignment system for proteins journal May 2019
VMD: Visual molecular dynamics journal February 1996
A Systematic Investigation into the Effect of Protein Destabilisation on Beta 2-Microglobulin Amyloid Formation journal July 2003
[20] Processing of X-ray diffraction data collected in oscillation mode book January 1997
Trabecular Meshwork Cellularity in Primary Open-angle Glaucoma and Nonglaucomatous Normals journal June 1984
Folding nucleus: specific of multiple? insights from lattice models and experiments journal November 1998
De Novo Evolutionary Emergence of a Symmetrical Protein Is Shaped by Folding Constraints journal January 2016
Temperature sensitive secretion of mutant myocilins journal June 2006
Functional analysis of the glaucoma-causing TIGR/myocilin protein: Integrity of amino-terminal coiled-coil regions and olfactomedin homology domain is essential for extracellular adhesion and secretion journal June 2006
Thermodynamic and Kinetic Characterization of a Germ Line Human λ6 Light-Chain Protein: The Relation between Unfolding and Fibrillogenesis journal March 2009
Residual Structures in the Acid-Unfolded States of Vλ6 Proteins Affect Amyloid Fibrillation journal October 2009
Amyloid Fibril Formation by the Glaucoma-Associated Olfactomedin Domain of Myocilin journal August 2012
On the Possible Amyloid Origin of Protein Folds journal August 2012
The Glaucoma-Associated Olfactomedin Domain of Myocilin Forms Polymorphic Fibrils That Are Constrained by Partial Unfolding and Peptide Sequence journal February 2014
Conformational Conversion during Amyloid Formation at Atomic Resolution journal January 2011
Structure and Misfolding of the Flexible Tripartite Coiled-Coil Domain of Glaucoma-Associated Myocilin journal November 2017
The many blades of the β-propeller proteins: conserved but versatile journal October 2011
Biological Roles of Protein Kinetic Stability journal November 2017
Partial denaturation of transthyretin is sufficient for amyloid fibril formation in vitro journal September 1992
Structural Characterization of the Partially Folded Intermediates of an Immunoglobulin Light Chain Leading to Amyloid Fibrillation and Amorphous Aggregation journal March 2007
The Stability of Myocilin Olfactomedin Domain Variants Provides New Insight into Glaucoma as a Protein Misfolding Disorder journal July 2011
The Acid-Mediated Denaturation Pathway of Transthyretin Yields a Conformational Intermediate That Can Self-Assemble into Amyloid journal January 1996
Guanidine Hydrochloride Can Induce Amyloid Fibril Formation from Hen Egg-White Lysozyme journal June 2004
Rescue of Glaucoma-Causing Mutant Myocilin Thermal Stability by Chemical Chaperones journal March 2010
Long-Time-Step Molecular Dynamics through Hydrogen Mass Repartitioning journal March 2015
Structure and Dynamics of a Partially Folded Protein Are Decoupled from Its Mechanism of Aggregation journal September 2008
Poisson-Gap Sampling and Forward Maximum Entropy Reconstruction for Enhancing the Resolution and Sensitivity of Protein NMR Data journal February 2010
A Population Shift between Sparsely Populated Folding Intermediates Determines Amyloidogenicity journal May 2016
Instability, unfolding and aggregation of human lysozyme variants underlying amyloid fibrillogenesis journal February 1997
A camelid antibody fragment inhibits the formation of amyloid fibrils by human lysozyme journal August 2003
Amyloid formation by globular proteins under native conditions journal December 2008
CHARMM36m: an improved force field for folded and intrinsically disordered proteins journal November 2016
A molecular mechanism for transthyretin amyloidogenesis journal February 2019
Cryo-EM structure of a light chain-derived amyloid fibril from a patient with systemic AL amyloidosis journal March 2019
Evidence that the TRPV1 S1-S4 membrane domain contributes to thermosensing journal August 2020
The effect of concentration, temperature and stirring on hen egg white lysozyme amyloid formation journal January 2013
Primary Open-Angle Glaucoma journal March 2009
Scalable molecular dynamics on CPU and GPU architectures with NAMD journal July 2020
Transient structural distortion of metal-free Cu/Zn superoxide dismutase triggers aberrant oligomerization journal October 2009
Two-state models of protein folding kinetics journal January 1997
Amyloid fibril formation by an SH3 domain journal April 1998
Equilibria and kinetics of folding of gelsolin domain 2 and mutants involved in familial amyloidosis–Finnish type journal September 1999
Glucose-regulated Protein 94 Triage of Mutant Myocilin through Endoplasmic Reticulum-associated Degradation Subverts a More Efficient Autophagic Clearance Mechanism journal October 2012
The Glaucoma-associated Olfactomedin Domain of Myocilin Is a Novel Calcium Binding Protein journal November 2012
Stable calcium-free myocilin olfactomedin domain variants reveal challenges in differentiating between benign and glaucoma-causing mutations journal July 2019
The role of the IT-state in D76N β2-microglobulin amyloid assembly: A crucial intermediate or an innocuous bystander? journal August 2020
A Cellular Assay Distinguishes Normal and Mutant TIGR/Myocilin Protein journal November 1999
Analysis of Myocilin Mutations in 1703 Glaucoma Patients From Five Different Populations journal May 1999
Reversal of mutant myocilin non-secretion and cell killing: implications for glaucoma journal April 2004
Structural basis for misfolding in myocilin-associated glaucoma journal December 2014
Solving structures of protein complexes by molecular replacement with Phaser journal December 2006
Towards automated crystallographic structure refinement with phenix.refine journal March 2012
Calcium-ligand variants of the myocilin olfactomedin propeller selected from invertebrate phyla reveal cross-talk with N-terminal blade and surface helices journal August 2019
Urea modulation of β‐amyloid fibril growth: Experimental studies and kinetic models journal November 2004
Amyloid protofilament formation of hen egg lysozyme in highly concentrated ethanol solution journal January 2000
Simple high‐resolution NMR spectroscopy as a tool in molecular biology journal February 2019
Structure of an Intermediate State in Protein Folding and Aggregation journal April 2012
Protein Misfolding, Functional Amyloid, and Human Disease journal June 2006
Intracellular Sequestration of Hetero-oligomers Formed by Wild-Type and Glaucoma-Causing Myocilin Mutants journal October 2004
Molecular mechanisms of proteinopathies across neurodegenerative disease: a review journal September 2019
Quantitative differentiation of benign and misfolded glaucoma-causing myocilin variants on the basis of protein thermal stability journal January 2023
Cellular Processing of Myocilin journal April 2014
Protein Identification and Analysis Tools on the ExPASy Server book January 2005
Thermally Induced Fibrillar Aggregation of Hen Egg White Lysozyme journal January 2005
Aggregated Myocilin Induces Russell Bodies and Causes Apoptosis journal January 2007
New β-Propellers Are Continuously Amplified From Single Blades in all Major Lineages of the β-Propeller Superfamily journal June 2022
Thermal fluctuations of immature SOD1 lead to separate folding and misfolding pathways journal June 2015