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De novo design of knotted tandem repeat proteins

Journal Article · · Nature Communications

De novo protein design methods can create proteins with folds not yet seen in nature. These methods largely focus on optimizing the compatibility between the designed sequence and the intended conformation, without explicit consideration of protein folding pathways. Deeply knotted proteins, whose topologies may introduce substantial barriers to folding, thus represent an interesting test case for protein design. Here we report our attempts to design proteins with trefoil (31) and pentafoil (51) knotted topologies. We extended previously described algorithms for tandem repeat protein design in order to construct deeply knotted backbones and matching designed repeat sequences (N = 3 repeats for the trefoil and N = 5 for the pentafoil). We confirmed the intended conformation for the trefoil design by X ray crystallography, and we report here on this protein’s structure, stability, and folding behaviour. The pentafoil design misfolded into an asymmetric structure (despite a 5-fold symmetric sequence); two of the four repeat-repeat units matched the designed backbone while the other two diverged to form local contacts, leading to a trefoil rather than pentafoil knotted topology. Our results also provide insights into the folding of knotted proteins.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF); USDOE Office of Science (SC), Biological and Environmental Research (BER); National Institutes of Health (NIH); Human Frontier Science Program Cross Disciplinary Fellowship; EMBO Non-Stipendiary Fellowship; Fred Hutchinson Cancer Center; National Institute for General Medical Sciences (NIGMS)
Grant/Contract Number:
AC02-05CH11231; AC02-06CH11357
OSTI ID:
2471064
Journal Information:
Nature Communications, Journal Name: Nature Communications Journal Issue: 1 Vol. 14; ISSN 2041-1723
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English

References (66)

AlphaFold predicts the most complex protein knot and composite protein knots journal July 2022
Assessing and enhancing foldability in designed proteins journal August 2022
AlphaFold predicts novel human proteins with knots journal April 2023
High-Throughput SAXS for the Characterization of Biomolecules in Solution: A Practical Approach book October 2013
Nonlinear total variation based noise removal algorithms journal November 1992
[20] Processing of X-ray diffraction data collected in oscillation mode book January 1997
Submillisecond kinetics of protein folding journal February 1997
Tightening the Knot in Phytochrome by Single-Molecule Atomic Force Microscopy journal February 2009
Converging experimental and computational views of the knotting mechanism of a small knotted protein journal June 2021
Recent advances in de novo protein design: Principles, methods, and applications journal January 2021
Folding Studies on a Knotted Protein journal March 2005
A Comparison of the Folding of Two Knotted Proteins: YbeA and YibK journal February 2007
Identification of Rare Slipknots in Proteins and Their Implications for Stability and Folding journal October 2007
The Knotted Protein UCH-L1 Exhibits Partially Unfolded Forms under Native Conditions that Share Common Structural Features with Its Kinetic Folding Intermediates journal June 2016
Proteins' Knotty Problems journal January 2019
A Brief History of De Novo Protein Design: Minimal, Rational, and Computational journal October 2021
Single-molecule force spectroscopy on polyproteins and receptor–ligand complexes: The current toolbox journal January 2017
Automated Structure- and Sequence-Based Design of Proteins for High Bacterial Expression and Stability journal July 2016
Protein production by auto-induction in high-density shaking cultures journal May 2005
On folding of entangled proteins: knots, lassos, links and θ-curves journal February 2020
Design of novel protein building modules and modular architectures journal August 2020
Folding, DNA Recognition, and Function of GIY-YIG Endonucleases: Crystal Structures of R.Eco29kI journal October 2010
Single-Molecule Force Spectroscopy Studies of Missense Titin Mutations That Are Likely Causing Cardiomyopathy journal October 2021
Combining in Vitro and in Silico Single-Molecule Force Spectroscopy to Characterize and Tune Cellulosomal Scaffoldin Mechanics journal November 2017
Self-Assembling 2D Arrays with de Novo Protein Building Blocks journal May 2019
Unraveling the Folding Mechanism of the Smallest Knotted Protein, MJ0366 journal March 2015
Stretching Response of Discrete Semiflexible Polymers journal April 2003
Structure of Yeast Phosphoglycerate Kinase journal January 1974
β-Sheet topology and the relatedness of proteins journal August 1977
A deeply knotted protein structure and how it might fold journal August 2000
Principles for designing ideal protein structures journal November 2012
Rational design of α-helical tandem repeat proteins with closed architectures journal December 2015
Generation of bispecific IgG antibodies by structure-based design of an orthogonal Fab interface journal January 2014
Computational design of self-assembling cyclic protein homo-oligomers journal December 2016
Tandem repeats mediating genetic plasticity in health and disease journal February 2018
Are there knots in proteins? journal April 1994
Control of repeat-protein curvature by computational protein design journal January 2015
Highly accurate protein structure prediction with AlphaFold journal July 2021
Engineering and functionalization of large circular tandem repeat protein nanoparticles journal March 2020
Design of functionalised circular tandem repeat proteins with longer repeat topologies and enhanced subunit contact surfaces journal October 2021
Single molecule force spectroscopy reveals the context dependent folding pathway of the C-terminal fragment of Top7 journal January 2021
Calibration of atomic‐force microscope tips journal July 1993
A   -barrel built by the combination of fragments from different folds journal July 2008
Stabilizing effect of knots on proteins journal December 2008
Design of therapeutic proteins with enhanced stability journal July 2009
Structure and folding of a designed knotted protein journal November 2010
Knotting and unknotting of a protein in single molecule experiments journal June 2016
One-step design of a stable variant of the malaria invasion protein RH5 for use as a vaccine immunogen journal January 2017
Staphylococcus aureus clumping factor A is a force-sensitive molecular switch that activates bacterial adhesion journal May 2018
Near-atomic cryo-EM imaging of a small protein displayed on a designed scaffolding system journal March 2018
Calculation of thermal noise in atomic force microscopy journal January 1995
RepeatsDB in 2021: improved data and extended classification for protein tandem repeat structures journal November 2020
FoXS: a web server for rapid computation and fitting of SAXS profiles journal May 2010
KnotProt 2.0: a database of proteins with knots and other entangled structures journal December 2018
Highly Stretched Single Polymers: Atomic-Force-Microscope Experiments VersusAb-InitioTheory journal January 2005
Phaser crystallographic software journal July 2007
PHENIX: a comprehensive Python-based system for macromolecular structure solution journal January 2010
A Direct Algorithm for 1-D Total Variation Denoising journal November 2013
Matplotlib: A 2D Graphics Environment journal January 2007
The NumPy Array: A Structure for Efficient Numerical Computation journal March 2011
Design of a Novel Globular Protein Fold with Atomic-Level Accuracy journal November 2003
Robust deep learning–based protein sequence design using ProteinMPNN journal October 2022
Comparing Proteins by Their Unfolding Pattern journal July 2008
Current Trends in Protein Engineering: Updates and Progress journal March 2019
Investigating Receptor-ligand Systems of the Cellulosome with AFM-based Single-molecule Force Spectroscopy journal December 2013
Tandem-repeat protein domains across the tree of life journal January 2015

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