LIVIVO - The Search Portal for Life Sciences

zur deutschen Oberfläche wechseln
Advanced search

Search results

Result 1 - 10 of total 38

Search options

  1. Article ; Online: Free Energy Perturbation Calculations of Mutation Effects on SARS-CoV-2 RBD::ACE2 Binding Affinity

    Sergeeva, Alina P. / Katsamba, Phinikoula S. / Liao, Junzhuo / Sampson, Jared M. / Bahna, Fabiana / Mannepalli, Seetha / Morano, Nicholas C. / Shapiro, Lawrence / Friesner, Richard A. / Honig, Barry

    Journal of Molecular Biology. 2023 Aug., v. 435, no. 15 p.168187-

    2023  

    Abstract: The strength of binding between human angiotensin converting enzyme 2 (ACE2) and the receptor binding domain (RBD) of viral spike protein plays a role in the transmissibility of the SARS-CoV-2 virus. In this study we focus on a subset of RBD mutations ... ...

    Abstract The strength of binding between human angiotensin converting enzyme 2 (ACE2) and the receptor binding domain (RBD) of viral spike protein plays a role in the transmissibility of the SARS-CoV-2 virus. In this study we focus on a subset of RBD mutations that have been frequently observed in infected individuals and probe binding affinity changes to ACE2 using surface plasmon resonance (SPR) measurements and free energy perturbation (FEP) calculations. Our SPR results are largely in accord with previous studies but discrepancies do arise due to differences in experimental methods and to protocol differences even when a single method is used. Overall, we find that FEP performance is superior to that of other computational approaches examined as determined by agreement with experiment and, in particular, by its ability to identify stabilizing mutations. Moreover, the calculations successfully predict the observed cooperative stabilization of binding by the Q498R N501Y double mutant present in Omicron variants and offer a physical explanation for the underlying mechanism. Overall, our results suggest that despite the significant computational cost, FEP calculations may offer an effective strategy to understand the effects of interfacial mutations on protein–protein binding affinities and, hence, in a variety of practical applications such as the optimization of neutralizing antibodies.
    Keywords Gibbs free energy ; Severe acute respiratory syndrome coronavirus 2 ; enzymes ; humans ; molecular biology ; mutants ; mutation ; surface plasmon resonance ; viruses ; FEP ; SPR ; protein–protein interactions ; ddG prediction ; receptor binding domain and angiotensin converting enzyme 2
    Language English
    Dates of publication 2023-08
    Publishing place Elsevier Ltd
    Document type Article ; Online
    ZDB-ID 80229-3
    ISSN 1089-8638 ; 0022-2836
    ISSN (online) 1089-8638
    ISSN 0022-2836
    DOI 10.1016/j.jmb.2023.168187
    Database NAL-Catalogue (AGRICOLA)

    More links

    Kategorien

  2. Article: Astrocyte morphogenesis requires self-recognition.

    Zipursky, S / Lee, John / Sergeeva, Alina / Ahlsen, Goran / Mannepalli, Seetha / Bahna, Fabiana / Goodman, Kerry / Khakh, Baljit / Weiner, Joshua / Shapiro, Lawrence / Honig, Barry

    Research square

    2024  

    Abstract: Self-recognition is a fundamental cellular process across evolution and forms the basis of neuronal self-avoidance1-4. Clustered protocadherins (Pcdh), comprising a large family of isoform-specific homophilic recognition molecules, play a pivotal role in ...

    Abstract Self-recognition is a fundamental cellular process across evolution and forms the basis of neuronal self-avoidance1-4. Clustered protocadherins (Pcdh), comprising a large family of isoform-specific homophilic recognition molecules, play a pivotal role in neuronal self-avoidance required for mammalian brain development5-7. The probabilistic expression of different Pcdh isoforms confers unique identities upon neurons and forms the basis for neuronal processes to discriminate between self and non-self5,6,8. Whether this self-recognition mechanism exists in astrocytes, the other predominant cell type of the brain, remains unknown. Here, we report that a specific isoform in the Pcdhγ cluster, γC3, is highly enriched in human and murine astrocytes. Through genetic manipulation, we demonstrate that γC3 acts autonomously to regulate astrocyte morphogenesis in the mouse visual cortex. To determine if γC3 proteins act by promoting recognition between processes of the same astrocyte, we generated pairs of γC3 chimeric proteins capable of heterophilic binding to each other, but incapable of homophilic binding. Co-expressing complementary heterophilic binding isoform pairs in the same γC3 null astrocyte restored normal morphology. By contrast, chimeric γC3 proteins individually expressed in single γC3 null mutant astrocytes did not. These data establish that self-recognition is essential for astrocyte development in the mammalian brain and that, by contrast to neuronal self-recognition, a single Pcdh isoform is both necessary and sufficient for this process.
    Language English
    Publishing date 2024-02-22
    Publishing country United States
    Document type Preprint
    DOI 10.21203/rs.3.rs-3932947/v1
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  3. Article ; Online: Free Energy Perturbation Calculations of Mutation Effects on SARS-CoV-2 RBD::ACE2 Binding Affinity.

    Sergeeva, Alina P / Katsamba, Phinikoula S / Liao, Junzhuo / Sampson, Jared M / Bahna, Fabiana / Mannepalli, Seetha / Morano, Nicholas C / Shapiro, Lawrence / Friesner, Richard A / Honig, Barry

    Journal of molecular biology

    2023  Volume 435, Issue 15, Page(s) 168187

    Abstract: The strength of binding between human angiotensin converting enzyme 2 (ACE2) and the receptor binding domain (RBD) of viral spike protein plays a role in the transmissibility of the SARS-CoV-2 virus. In this study we focus on a subset of RBD mutations ... ...

    Abstract The strength of binding between human angiotensin converting enzyme 2 (ACE2) and the receptor binding domain (RBD) of viral spike protein plays a role in the transmissibility of the SARS-CoV-2 virus. In this study we focus on a subset of RBD mutations that have been frequently observed in infected individuals and probe binding affinity changes to ACE2 using surface plasmon resonance (SPR) measurements and free energy perturbation (FEP) calculations. Our SPR results are largely in accord with previous studies but discrepancies do arise due to differences in experimental methods and to protocol differences even when a single method is used. Overall, we find that FEP performance is superior to that of other computational approaches examined as determined by agreement with experiment and, in particular, by its ability to identify stabilizing mutations. Moreover, the calculations successfully predict the observed cooperative stabilization of binding by the Q498R N501Y double mutant present in Omicron variants and offer a physical explanation for the underlying mechanism. Overall, our results suggest that despite the significant computational cost, FEP calculations may offer an effective strategy to understand the effects of interfacial mutations on protein-protein binding affinities and, hence, in a variety of practical applications such as the optimization of neutralizing antibodies.
    MeSH term(s) Humans ; Angiotensin-Converting Enzyme 2/chemistry ; Angiotensin-Converting Enzyme 2/genetics ; Mutation ; Protein Binding ; SARS-CoV-2/genetics ; Spike Glycoprotein, Coronavirus/chemistry ; Spike Glycoprotein, Coronavirus/genetics ; Protein Domains
    Chemical Substances Angiotensin-Converting Enzyme 2 (EC 3.4.17.23) ; spike protein, SARS-CoV-2 ; Spike Glycoprotein, Coronavirus
    Language English
    Publishing date 2023-06-22
    Publishing country Netherlands
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 80229-3
    ISSN 1089-8638 ; 0022-2836
    ISSN (online) 1089-8638
    ISSN 0022-2836
    DOI 10.1016/j.jmb.2023.168187
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  4. Article: Robust prediction of relative binding energies for protein-protein complex mutations using free energy perturbation calculations.

    Sampson, Jared M / Cannon, Daniel A / Duan, Jianxin / Epstein, Jordan C K / Sergeeva, Alina P / Katsamba, Phinikoula S / Mannepalli, Seetha M / Bahna, Fabiana A / Adihou, Hélène / Guéret, Stéphanie M / Gopalakrishnan, Ranganath / Geschwindner, Stefan / Rees, D Gareth / Sigurdardottir, Anna / Wilkinson, Trevor / Dodd, Roger B / De Maria, Leonardo / Mobarec, Juan Carlos / Shapiro, Lawrence /
    Honig, Barry / Buchanan, Andrew / Friesner, Richard A / Wang, Lingle

    bioRxiv : the preprint server for biology

    2024  

    Abstract: Computational free energy-based methods have the potential to significantly improve throughput and decrease costs of protein design efforts. Such methods must reach a high level of reliability, accuracy, and automation to be effectively deployed in ... ...

    Abstract Computational free energy-based methods have the potential to significantly improve throughput and decrease costs of protein design efforts. Such methods must reach a high level of reliability, accuracy, and automation to be effectively deployed in practical industrial settings in a way that impacts protein design projects. Here, we present a benchmark study for the calculation of relative changes in protein-protein binding affinity for single point mutations across a variety of systems from the literature, using free energy perturbation (FEP+) calculations. We describe a method for robust treatment of alternate protonation states for titratable amino acids, which yields improved correlation with and reduced error compared to experimental binding free energies. Following careful analysis of the largest outlier cases in our dataset, we assess limitations of the default FEP+ protocols and introduce an automated script which identifies probable outlier cases that may require additional scrutiny and calculates an empirical correction for a subset of charge-related outliers. Through a series of three additional case study systems, we discuss how protein FEP+ can be applied to real-world protein design projects, and suggest areas of further study.
    Language English
    Publishing date 2024-04-24
    Publishing country United States
    Document type Preprint
    DOI 10.1101/2024.04.22.590325
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  5. Article ; Online: Affinity requirements for control of synaptic targeting and neuronal cell survival by heterophilic IgSF cell adhesion molecules.

    Xu, Shuwa / Sergeeva, Alina P / Katsamba, Phinikoula S / Mannepalli, Seetha / Bahna, Fabiana / Bimela, Jude / Zipursky, S Lawrence / Shapiro, Lawrence / Honig, Barry / Zinn, Kai

    Cell reports

    2022  Volume 39, Issue 1, Page(s) 110618

    Abstract: Neurons in the developing brain express many different cell adhesion molecules (CAMs) on their surfaces. CAM-binding affinities can vary by more than 200-fold, but the significance of these variations is unknown. Interactions between the immunoglobulin ... ...

    Abstract Neurons in the developing brain express many different cell adhesion molecules (CAMs) on their surfaces. CAM-binding affinities can vary by more than 200-fold, but the significance of these variations is unknown. Interactions between the immunoglobulin superfamily CAM DIP-α and its binding partners, Dpr10 and Dpr6, control synaptic targeting and survival of Drosophila optic lobe neurons. We design mutations that systematically change interaction affinity and analyze function in vivo. Reducing affinity causes loss-of-function phenotypes whose severity scales with the magnitude of the change. Synaptic targeting is more sensitive to affinity reduction than is cell survival. Increasing affinity rescues neurons that would normally be culled by apoptosis. By manipulating CAM expression together with affinity, we show that the key parameter controlling circuit assembly is surface avidity, which is the strength of adherence between cell surfaces. We conclude that CAM binding affinities and expression levels are finely tuned for function during development.
    MeSH term(s) Animals ; Cell Adhesion ; Cell Adhesion Molecules/genetics ; Cell Adhesion Molecules/metabolism ; Cell Adhesion Molecules, Neuronal/genetics ; Cell Adhesion Molecules, Neuronal/metabolism ; Cell Survival ; Drosophila/metabolism ; Drosophila Proteins/metabolism ; Drosophila melanogaster/metabolism ; Neurons/metabolism
    Chemical Substances Cell Adhesion Molecules ; Cell Adhesion Molecules, Neuronal ; Drosophila Proteins
    Language English
    Publishing date 2022-04-07
    Publishing country United States
    Document type Journal Article ; Research Support, N.I.H., Extramural ; Research Support, U.S. Gov't, Non-P.H.S.
    ZDB-ID 2649101-1
    ISSN 2211-1247 ; 2211-1247
    ISSN (online) 2211-1247
    ISSN 2211-1247
    DOI 10.1016/j.celrep.2022.110618
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  6. Article ; Online: How clustered protocadherin binding specificity is tuned for neuronal self-/nonself-recognition.

    Goodman, Kerry Marie / Katsamba, Phinikoula S / Rubinstein, Rotem / Ahlsén, Göran / Bahna, Fabiana / Mannepalli, Seetha / Dan, Hanbin / Sampogna, Rosemary V / Shapiro, Lawrence / Honig, Barry

    eLife

    2022  Volume 11

    Abstract: The stochastic expression of fewer than 60 clustered protocadherin (cPcdh) isoforms provides diverse identities to individual vertebrate neurons and a molecular basis for self-/nonself-discrimination. cPcdhs form chains mediated by ... ...

    Abstract The stochastic expression of fewer than 60 clustered protocadherin (cPcdh) isoforms provides diverse identities to individual vertebrate neurons and a molecular basis for self-/nonself-discrimination. cPcdhs form chains mediated by alternating
    MeSH term(s) Cadherins/metabolism ; Cell Communication ; Neurons/metabolism ; Protein Isoforms/metabolism ; Protocadherins
    Chemical Substances Cadherins ; Protein Isoforms ; Protocadherins
    Language English
    Publishing date 2022-03-07
    Publishing country England
    Document type Journal Article ; Research Support, N.I.H., Extramural ; Research Support, Non-U.S. Gov't ; Research Support, U.S. Gov't, Non-P.H.S.
    ZDB-ID 2687154-3
    ISSN 2050-084X ; 2050-084X
    ISSN (online) 2050-084X
    ISSN 2050-084X
    DOI 10.7554/eLife.72416
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  7. Article: Structural Basis for Accommodation of Emerging B.1.351 and B.1.1.7 Variants by Two Potent SARS-CoV-2 Neutralizing Antibodies.

    Cerutti, Gabriele / Rapp, Micah / Guo, Yicheng / Bahna, Fabiana / Bimela, Jude / Reddem, Eswar R / Yu, Jian / Wang, Pengfei / Liu, Lihong / Huang, Yaoxing / Ho, David D / Kwong, Peter D / Sheng, Zizhang / Shapiro, Lawrence

    bioRxiv : the preprint server for biology

    2021  

    Abstract: Emerging SARS-CoV-2 strains, B.1.1.7 and B.1.351, from the UK and South Africa, respectively show decreased neutralization by monoclonal antibodies and convalescent or vaccinee sera raised against the original wild-type virus, and are thus of clinical ... ...

    Abstract Emerging SARS-CoV-2 strains, B.1.1.7 and B.1.351, from the UK and South Africa, respectively show decreased neutralization by monoclonal antibodies and convalescent or vaccinee sera raised against the original wild-type virus, and are thus of clinical concern. However, the neutralization potency of two antibodies, 1-57 and 2-7, which target the receptor-binding domain (RBD) of spike, was unaffected by these emerging strains. Here, we report cryo-EM structures of 1-57 and 2-7 in complex with spike, revealing each of these antibodies to utilize a distinct mechanism to bypass or accommodate RBD mutations. Notably, each antibody represented a response with recognition distinct from those of frequent antibody classes. Moreover, many epitope residues recognized by 1-57 and 2-7 were outside hotspots of evolutionary pressure for both ACE2 binding and neutralizing antibody escape. We suggest the therapeutic use of antibodies like 1-57 and 2-7, which target less prevalent epitopes, could ameliorate issues of monoclonal antibody escape.
    Language English
    Publishing date 2021-02-22
    Publishing country United States
    Document type Preprint
    DOI 10.1101/2021.02.21.432168
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  8. Article: Neutralizing antibody 5-7 defines a distinct site of vulnerability in SARS-CoV-2 spike N-terminal domain.

    Cerutti, Gabriele / Guo, Yicheng / Wang, Pengfei / Nair, Manoj S / Huang, Yaoxing / Yu, Jian / Liu, Lihong / Katsamba, Phinikoula S / Bahna, Fabiana / Reddem, Eswar R / Kwong, Peter D / Ho, David D / Sheng, Zizhang / Shapiro, Lawrence

    bioRxiv : the preprint server for biology

    2021  

    Abstract: Antibodies that potently neutralize SARS-CoV-2 target mainly the receptor-binding domain or the N-terminal domain (NTD). Over a dozen potently neutralizing NTD-directed antibodies have been studied structurally, and all target a single antigenic ... ...

    Abstract Antibodies that potently neutralize SARS-CoV-2 target mainly the receptor-binding domain or the N-terminal domain (NTD). Over a dozen potently neutralizing NTD-directed antibodies have been studied structurally, and all target a single antigenic supersite in NTD (site 1). Here we report the 3.7 Å resolution cryo-EM structure of a potent NTD-directed neutralizing antibody 5-7, which recognizes a site distinct from other potently neutralizing antibodies, inserting a binding loop into an exposed hydrophobic pocket between the two sheets of the NTD β-sandwich. Interestingly, this pocket has been previously identified as the binding site for hydrophobic molecules including heme metabolites, but we observe their presence to not substantially impede 5-7 recognition. Mirroring its distinctive binding, antibody 5-7 retains a distinctive neutralization potency with variants of concern (VOC). Overall, we reveal a hydrophobic pocket in NTD proposed for immune evasion can actually be used by the immune system for recognition.
    Highlights: Cryo-EM structure of neutralizing antibody 5-7 in complex with SARS CoV-2 spike5-7 recognizes NTD outside of the previously identified antigenic supersite5-7 binds to a site known to accommodate numerous hydrophobic ligandsStructural basis of 5-7 neutralization tolerance to some variants of concern.
    Language English
    Publishing date 2021-06-29
    Publishing country United States
    Document type Preprint
    DOI 10.1101/2021.06.29.450397
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  9. Article ; Online: Structural basis for accommodation of emerging B.1.351 and B.1.1.7 variants by two potent SARS-CoV-2 neutralizing antibodies.

    Cerutti, Gabriele / Rapp, Micah / Guo, Yicheng / Bahna, Fabiana / Bimela, Jude / Reddem, Eswar R / Yu, Jian / Wang, Pengfei / Liu, Lihong / Huang, Yaoxing / Ho, David D / Kwong, Peter D / Sheng, Zizhang / Shapiro, Lawrence

    Structure (London, England : 1993)

    2021  Volume 29, Issue 7, Page(s) 655–663.e4

    Abstract: Emerging SARS-CoV-2 strains, B.1.1.7 and B.1.351, from the UK and South Africa, respectively, show decreased neutralization by monoclonal antibodies and convalescent or vaccinee sera raised against the original wild-type virus, and are thus of clinical ... ...

    Abstract Emerging SARS-CoV-2 strains, B.1.1.7 and B.1.351, from the UK and South Africa, respectively, show decreased neutralization by monoclonal antibodies and convalescent or vaccinee sera raised against the original wild-type virus, and are thus of clinical concern. However, the neutralization potency of two antibodies, 1-57 and 2-7, which target the receptor-binding domain (RBD) of the spike, was unaffected by these emerging strains. Here, we report cryo-EM structures of 1-57 and 2-7 in complex with spike, revealing each of these antibodies to utilize a distinct mechanism to bypass or accommodate RBD mutations. Notably, each antibody represented an immune response with recognition distinct from those of frequent antibody classes. Moreover, many epitope residues recognized by 1-57 and 2-7 were outside hotspots of evolutionary pressure for ACE2 binding and neutralizing antibody escape. We suggest the therapeutic use of antibodies, such as 1-57 and 2-7, which target less prevalent epitopes, could ameliorate issues of monoclonal antibody escape.
    MeSH term(s) Angiotensin-Converting Enzyme 2/chemistry ; Angiotensin-Converting Enzyme 2/genetics ; Angiotensin-Converting Enzyme 2/immunology ; Angiotensin-Converting Enzyme 2/metabolism ; Antibodies, Monoclonal/chemistry ; Antibodies, Monoclonal/genetics ; Antibodies, Monoclonal/immunology ; Antibodies, Monoclonal/metabolism ; Antibodies, Neutralizing/chemistry ; Antibodies, Neutralizing/genetics ; Antibodies, Neutralizing/immunology ; Antibodies, Neutralizing/metabolism ; Antibodies, Viral/chemistry ; Antibodies, Viral/genetics ; Antibodies, Viral/immunology ; Antibodies, Viral/metabolism ; Binding Sites ; Cloning, Molecular ; Cryoelectron Microscopy ; Epitopes/chemistry ; Epitopes/genetics ; Epitopes/immunology ; Epitopes/metabolism ; Gene Expression ; HEK293 Cells ; Humans ; Models, Molecular ; Mutation ; Protein Binding ; Protein Conformation, alpha-Helical ; Protein Conformation, beta-Strand ; Protein Interaction Domains and Motifs ; Receptors, Virus/chemistry ; Receptors, Virus/genetics ; Receptors, Virus/immunology ; Receptors, Virus/metabolism ; Recombinant Proteins/chemistry ; Recombinant Proteins/genetics ; Recombinant Proteins/immunology ; Recombinant Proteins/metabolism ; SARS-CoV-2/chemistry ; SARS-CoV-2/genetics ; SARS-CoV-2/immunology ; SARS-CoV-2/metabolism ; Spike Glycoprotein, Coronavirus/chemistry ; Spike Glycoprotein, Coronavirus/genetics ; Spike Glycoprotein, Coronavirus/immunology ; Spike Glycoprotein, Coronavirus/metabolism
    Chemical Substances Antibodies, Monoclonal ; Antibodies, Neutralizing ; Antibodies, Viral ; Epitopes ; Receptors, Virus ; Recombinant Proteins ; Spike Glycoprotein, Coronavirus ; spike protein, SARS-CoV-2 ; ACE2 protein, human (EC 3.4.17.23) ; Angiotensin-Converting Enzyme 2 (EC 3.4.17.23)
    Language English
    Publishing date 2021-06-09
    Publishing country United States
    Document type Journal Article ; Research Support, N.I.H., Extramural ; Research Support, N.I.H., Intramural ; Research Support, Non-U.S. Gov't
    ZDB-ID 1213087-4
    ISSN 1878-4186 ; 0969-2126
    ISSN (online) 1878-4186
    ISSN 0969-2126
    DOI 10.1016/j.str.2021.05.014
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  10. Article ; Online: Free energy perturbation calculations of mutation effects on SARS-CoV-2 RBD::ACE2 binding affinity

    Sergeeva, Alina P. / Katsamba, Phinikoula S. / Sampson, Jared M. / Bahna, Fabiana / Mannepalli, Seetha / Morano, Nicholas C. / Shapiro, Lawrence / Friesner, Richard A. / Honig, Barry

    bioRxiv

    Abstract: The strength of binding between human angiotensin converting enzyme 2 (ACE2) and the receptor binding domain (RBD) of viral spike protein plays a role in the transmissibility of the SARS-CoV-2 virus. In this study we focus on a subset of RBD mutations ... ...

    Abstract The strength of binding between human angiotensin converting enzyme 2 (ACE2) and the receptor binding domain (RBD) of viral spike protein plays a role in the transmissibility of the SARS-CoV-2 virus. In this study we focus on a subset of RBD mutations that have been frequently observed in sequenced samples from infected individuals and probe binding affinity changes to ACE2 using surface plasmon resonance (SPR) measurements and free energy perturbation (FEP) calculations. We find that FEP performance is significantly better than that of other computational approaches examined here, in part due to its ability to account for protein structure relaxation resulting from the mutation of interfacial residues. Moreover, analysis of FEP trajectories offers physical insights not available from other methods. Notably, FEP calculations successfully predict the observed cooperative stabilization of binding by the Q498R N501Y double mutant present in the Omicron variant and offer a physical explanation for the underlying mechanism. Our results furthermore suggest a strategy as to how to effectively deploy FEP methods in the optimization of neutralizing antibodies.
    Keywords covid19
    Language English
    Publishing date 2022-08-01
    Publisher Cold Spring Harbor Laboratory
    Document type Article ; Online
    DOI 10.1101/2022.08.01.502301
    Database COVID19

    Kategorien

To top