The Spike of Concern—The Novel Variants of SARS-CoV-2

Viruses, Год журнала: 2021, Номер 13(6), С. 1002 - 1002

Опубликована: Май 27, 2021

The high sequence identity of the first SARS-CoV-2 samples collected in December 2019 at Wuhan did not foretell emergence novel variants United Kingdom, North and South America, India, or Africa that drive current waves pandemic. viral spike receptor possesses two surface areas mutagenic plasticity: supersite its N-terminal domain (NTD) is recognised by all anti-NTD antibodies binding (RBD) where 17 residues make contact with human Ace2 protein (angiotensin I converting enzyme 2) many neutralising bind. While NTD mutations appear glance very diverse, they converge on structure supersite. within RBD, other hand, hone only a small number key sites (K417, L452, E484, N501) are allosteric control points enabling to escape while maintaining even gaining Ace2-binding activity. D614G mutation hallmark variants, as it promotes spread increasing open protomers homo-trimeric complex. This review discusses recent well their evolution.

Язык: Английский

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Origin and evolutionary analysis of the SARS-CoV-2 Omicron variant

Journal of Biosafety and Biosecurity, Год журнала: 2021, Номер 4(1), С. 33 - 37

Опубликована: Дек. 31, 2021

The severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) has evolved rapidly into new variants throughout the pandemic. Omicron variant more than 50 mutations when compared with original wild-type strain and been identified globally in numerous countries. In this report, we analyzed mutational profiles of several variants, including per-site mutation rate, to determine evolutionary relationships. was found have a unique profile that other SARS-CoV-2 containing are rare clinical samples. Moreover, presence five mouse-adapted sites suggests may mouse host. Mutations receptor-binding domain (RBD) region, particular, potential implications for ongoing

Язык: Английский

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Impact of new variants on SARS-CoV-2 infectivity and neutralization: A molecular assessment of the alterations in the spike-host protein interactions

iScience, Год журнала: 2022, Номер 25(3), С. 103939 - 103939

Опубликована: Фев. 17, 2022

Язык: Английский

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Markov State Models and Perturbation-Based Approaches Reveal Distinct Dynamic Signatures and Hidden Allosteric Pockets in the Emerging SARS-Cov-2 Spike Omicron Variant Complexes with the Host Receptor: The Interplay of Dynamics and Convergent Evolution Modulates Allostery and Functional Mechanisms

Journal of Chemical Information and Modeling, Год журнала: 2023, Номер 63(16), С. 5272 - 5296

Опубликована: Авг. 7, 2023

The new generation of SARS-CoV-2 Omicron variants displayed a significant growth advantage and increased viral fitness by acquiring convergent mutations, suggesting that the immune pressure can promote evolution leading to sudden acceleration evolution. In current study, we combined structural modeling, microsecond molecular dynamics simulations, Markov state models characterize conformational landscapes identify specific dynamic signatures spike complexes with host receptor ACE2 for recently emerged highly transmissible XBB.1, XBB.1.5, BQ.1, BQ.1.1 variants. Microsecond simulations Markovian modeling provided detailed characterization functional states revealed thermodynamic stabilization XBB.1.5 subvariant, which be contrasted more BQ.1 subvariants. Despite considerable similarities, mutations induce unique distributions states. results suggested variant-specific changes mobility in interfacial loops receptor-binding domain protein fine-tuned through crosstalk between could provide an evolutionary path modulation escape. By combining atomistic analysis perturbation-based approaches, determined important complementary roles mutation sites as effectors receivers allosteric signaling involved plasticity regulation communications. This study also hidden pockets control distribution flexible adaptable regions.

Язык: Английский

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Exploring and Learning the Universe of Protein Allostery Using Artificial Intelligence Augmented Biophysical and Computational Approaches

Journal of Chemical Information and Modeling, Год журнала: 2023, Номер 63(5), С. 1413 - 1428

Опубликована: Фев. 24, 2023

Allosteric mechanisms are commonly employed regulatory tools used by proteins to orchestrate complex biochemical processes and control communications in cells. The quantitative understanding characterization of allosteric molecular events among major challenges modern biology require integration innovative computational experimental approaches obtain atomistic-level knowledge the states, interactions, dynamic conformational landscapes. growing body studies empowered emerging artificial intelligence (AI) technologies has opened up new paradigms for exploring learning universe protein allostery from first principles. In this review we analyze recent developments high-throughput deep mutational scanning functions; applications latest adaptations Alpha-fold structural prediction methods dynamics allostery; frontiers integrating machine enhanced sampling techniques advances systems. We also highlight SARS-CoV-2 spike (S) revealing an important often hidden role regulation driving functional changes, binding interactions with host receptor, escape S which critical viral infection. conclude a summary outlook future directions suggesting that AI-augmented biophysical computer simulation beginning transform toward systematic landscapes, may bring about revolution drug discovery.

Язык: Английский

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AlphaFold2 Modeling and Molecular Dynamics Simulations of the Conformational Ensembles for the SARS-CoV-2 Spike Omicron JN.1, KP.2 and KP.3 Variants: Mutational Profiling of Binding Energetics Reveals Epistatic Drivers of the ACE2 Affinity and Escape Hotspots of Antibody Resistance

Viruses, Год журнала: 2024, Номер 16(9), С. 1458 - 1458

Опубликована: Сен. 13, 2024

The most recent wave of SARS-CoV-2 Omicron variants descending from BA.2 and BA.2.86 exhibited improved viral growth fitness due to convergent evolution functional hotspots. These hotspots operate in tandem optimize both receptor binding for effective infection immune evasion efficiency, thereby maintaining overall fitness. lack molecular details on structure, dynamics energetics the latest FLiRT FLuQE with ACE2 antibodies provides a considerable challenge that is explored this study. We combined AlphaFold2-based atomistic predictions structures conformational ensembles spike complexes host dominant JN.1, KP.1, KP.2 KP.3 examine mechanisms underlying role balancing antibody evasion. Using ensemble-based mutational scanning protein residues computations affinities, we identified energy characterized basis epistatic couplings between results suggested existence interactions sites at L455, F456, Q493 positions protect restore ACE2-binding affinity while conferring beneficial escape. To escape mechanisms, performed structure-based profiling several classes displayed impaired neutralization against BA.2.86, KP.3. confirmed experimental data harboring L455S F456L mutations can significantly impair neutralizing activity class 1 monoclonal antibodies, effects mediated by facilitate subsequent convergence Q493E changes rescue binding. Structural energetic analysis provided rationale showing BD55-5840 BD55-5514 bind different epitopes retain efficacy all examined support notion may favor emergence lineages combinations involving mediators control balance high

Язык: Английский

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Quantitative Characterization and Prediction of the Binding Determinants and Immune Escape Hotspots for Groups of Broadly Neutralizing Antibodies Against Omicron Variants: Atomistic Modeling of the SARS-CoV-2 Spike Complexes with Antibodies

Biomolecules, Год журнала: 2025, Номер 15(2), С. 249 - 249

Опубликована: Фев. 8, 2025

A growing body of experimental and computational studies suggests that the cross-neutralization antibody activity against Omicron variants may be driven by balance tradeoff between multiple energetic factors interaction contributions evolving escape hotspots involved in antigenic drift convergent evolution. However, dynamic details quantifying contribution these factors, particularly balancing nature specific interactions formed antibodies with epitope residues, remain largely uncharacterized. In this study, we performed molecular dynamics simulations, an ensemble-based deep mutational scanning SARS-CoV-2 spike binding free energy computations for two distinct groups broadly neutralizing antibodies: E1 group (BD55-3152, BD55-3546, BD5-5840) F3 (BD55-3372, BD55-4637, BD55-5514). Using approaches, examined determinants which potent can evade immune resistance. Our analysis revealed emergence a small number positions correspond to R346 K444 strong van der Waals act synchronously, leading large contribution. According our results, Abs effectively exploit hotspot clusters hydrophobic sites are critical functions along selective complementary targeting positively charged important ACE2 binding. Together conserved epitopes, lead expand breadth resilience neutralization shifts associated viral The results study demonstrate excellent qualitative agreement predicted mutations respect latest experiments on average scores. We argue epitopes leverage stability binding, while tend emerge synergistically electrostatic interactions.

Язык: Английский

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Dynamic Profiling of Binding and Allosteric Propensities of the SARS-CoV-2 Spike Protein with Different Classes of Antibodies: Mutational and Perturbation-Based Scanning Reveals the Allosteric Duality of Functionally Adaptable Hotspots

Journal of Chemical Theory and Computation, Год журнала: 2021, Номер 17(7), С. 4578 - 4598

Опубликована: Июнь 17, 2021

The functional adaptability and conformational plasticity of SARS-CoV-2 spike proteins allow for the efficient modulation complex phenotypic responses to host receptor antibodies. In this study, we combined atomistic simulations with mutational perturbation-based scanning approaches examine binding mechanisms three different classes ensemble-based profiling allosteric propensities protein residues showed that these can work as functionally adaptable allosterically regulated machines. Conformational dynamics analysis revealed binding-induced soft modes elicit unique response Mutational heatmaps sensitivity energy hotspots antibodies are consistent experimental deep mutagenesis, showing differences in affinity caused by global circulating variants positions K417, E484, N501 relatively moderate may not fully account observed antibody resistance effects. Through perturbation-response unbound form antibody-bound forms, how modulate determine control signal transmission changes. These results show targeted mutations correspond a group versatile centers which small perturbations collective motions, alter response, resistance. We suggest S exploit specific generate escape mutants without compromising activity protein.

Язык: Английский

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Balancing Functional Tradeoffs between Protein Stability and ACE2 Binding in the SARS-CoV-2 Omicron BA.2, BA.2.75 and XBB Lineages: Dynamics-Based Network Models Reveal Epistatic Effects Modulating Compensatory Dynamic and Energetic Changes

Viruses, Год журнала: 2023, Номер 15(5), С. 1143 - 1143

Опубликована: Май 10, 2023

Evolutionary and functional studies suggested that the emergence of Omicron variants can be determined by multiple fitness trade-offs including immune escape, binding affinity for ACE2, conformational plasticity, protein stability allosteric modulation. In this study, we systematically characterize dynamics, structural affinities SARS-CoV-2 Spike complexes with host receptor ACE2 BA.2, BA.2.75, XBB.1 XBB.1.5 variants. We combined multiscale molecular simulations dynamic analysis interactions together ensemble-based mutational scanning residues network modeling epistatic interactions. This multifaceted computational study characterized mechanisms identified energetic hotspots mediate predicted increased enhanced BA.2.75 complexes. The results a mechanism driven spatially localized group centers, while allowing functionally beneficial neutral mutations in other interface positions. A network-based community model contributions is proposed revealing key role R498 Y501 mediating community-based couplings sites compensatory dynamics changes. also showed convergent evolutionary hotspot F486 modulate not only local but rewire global communities region F486P mutation to restore both variant which may explain growth advantages over variant. are consistent broad range rationalizing roles form coordinated enabling balance tradeoffs shaping up complex landscape virus transmissibility.

Язык: Английский

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Ensemble-Based Mutational Profiling and Network Analysis of the SARS-CoV-2 Spike Omicron XBB Lineages for Interactions with the ACE2 Receptor and Antibodies: Cooperation of Binding Hotspots in Mediating Epistatic Couplings Underlies Binding Mechanism and Immune Escape

International Journal of Molecular Sciences, Год журнала: 2024, Номер 25(8), С. 4281 - 4281

Опубликована: Апрель 12, 2024

In this study, we performed a computational study of binding mechanisms for the SARS-CoV-2 spike Omicron XBB lineages with host cell receptor ACE2 and panel diverse class one antibodies. The central objective investigation was to examine molecular factors underlying epistatic couplings among convergent evolution hotspots that enable optimal balancing antibody evasion variants BA.1, BA2, BA.3, BA.4/BA.5, BQ.1.1, XBB.1, XBB.1.5, XBB.1.5 + L455F/F456L. By combining evolutionary analysis, dynamics simulations, ensemble-based mutational scanning protein residues in complexes ACE2, identified structural stability affinity are consistent results biochemical studies. agreement deep experiments, our quantitative analysis correctly reproduced strong variant-specific effects BA.2 variants. It shown Y453W F456L mutations can enhance when coupled Q493 while these become destabilized R493 position variant. provided rationale mechanism variants, showing role Q493/R493 hotspot modulating between sites L455F lineages. receptors antibodies provide experimental evidence interactions physically proximal Y501, R498, Q493, L455F, determine binding, F486P instrumental mediating broad resistance. supports which impact on is mediated through small group universal hotspots, effect immune could be more variant-dependent modulated by conformationally adaptable regions.

Язык: Английский

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