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  1. Article ; Online: SARS-CoV-2 multi-antigen protein microarray for detailed characterization of antibody responses in COVID-19 patients.

    Celikgil, Alev / Massimi, Aldo B / Nakouzi, Antonio / Herrera, Natalia G / Morano, Nicholas C / Lee, James H / Yoon, Hyun Ah / Garforth, Scott J / Almo, Steven C

    PloS one

    2023  Volume 18, Issue 2, Page(s) e0276829

    Abstract: Antibodies against severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) target multiple epitopes on different domains of the spike protein, and other SARS-CoV-2 proteins. We developed a SARS-CoV-2 multi-antigen protein microarray with the ... ...

    Abstract Antibodies against severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) target multiple epitopes on different domains of the spike protein, and other SARS-CoV-2 proteins. We developed a SARS-CoV-2 multi-antigen protein microarray with the nucleocapsid, spike and its domains (S1, S2), and variants with single (D614G, E484K, N501Y) or double substitutions (N501Y/Deletion69/70), allowing a more detailed high-throughput analysis of the antibody repertoire following infection. The assay was demonstrated to be reliable and comparable to ELISA. We analyzed antibodies from 18 COVID-19 patients and 12 recovered convalescent donors. The S IgG level was higher than N IgG in most of the COVID-19 patients, and the receptor-binding domain of S1 showed high reactivity, but no antibodies were detected against the heptad repeat domain 2 of S2. Furthermore, antibodies were detected against S variants with single and double substitutions in COVID-19 patients who were infected with SARS-CoV-2 early in the pandemic. Here we demonstrated that the SARS-CoV-2 multi-antigen protein microarray is a powerful tool for detailed characterization of antibody responses, with potential utility in understanding the disease progress and assessing current vaccines and therapies against evolving SARS-CoV-2.
    MeSH term(s) Humans ; Antibodies, Neutralizing/genetics ; Antibodies, Neutralizing/immunology ; Antibodies, Viral/genetics ; Antibodies, Viral/immunology ; Antibody Formation/genetics ; Antibody Formation/immunology ; COVID-19/genetics ; COVID-19/immunology ; COVID-19/virology ; Immunoglobulin G ; Protein Array Analysis ; SARS-CoV-2/genetics ; Spike Glycoprotein, Coronavirus
    Chemical Substances Antibodies, Neutralizing ; Antibodies, Viral ; Immunoglobulin G ; Spike Glycoprotein, Coronavirus ; spike protein, SARS-CoV-2
    Language English
    Publishing date 2023-02-09
    Publishing country United States
    Document type Journal Article ; Research Support, N.I.H., Extramural ; Research Support, Non-U.S. Gov't
    ZDB-ID 2267670-3
    ISSN 1932-6203 ; 1932-6203
    ISSN (online) 1932-6203
    ISSN 1932-6203
    DOI 10.1371/journal.pone.0276829
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: SARS-CoV-2 multi-antigen protein microarray for detailed characterization of antibody responses in COVID-19 patients

    Alev Celikgil / Aldo B. Massimi / Antonio Nakouzi / Natalia G. Herrera / Nicholas C. Morano / James H. Lee / Hyun ah Yoon / Scott J. Garforth / Steven C. Almo

    PLoS ONE, Vol 18, Iss

    2023  Volume 2

    Abstract: Antibodies against severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) target multiple epitopes on different domains of the spike protein, and other SARS-CoV-2 proteins. We developed a SARS-CoV-2 multi-antigen protein microarray with the ... ...

    Abstract Antibodies against severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) target multiple epitopes on different domains of the spike protein, and other SARS-CoV-2 proteins. We developed a SARS-CoV-2 multi-antigen protein microarray with the nucleocapsid, spike and its domains (S1, S2), and variants with single (D614G, E484K, N501Y) or double substitutions (N501Y/Deletion69/70), allowing a more detailed high-throughput analysis of the antibody repertoire following infection. The assay was demonstrated to be reliable and comparable to ELISA. We analyzed antibodies from 18 COVID-19 patients and 12 recovered convalescent donors. The S IgG level was higher than N IgG in most of the COVID-19 patients, and the receptor-binding domain of S1 showed high reactivity, but no antibodies were detected against the heptad repeat domain 2 of S2. Furthermore, antibodies were detected against S variants with single and double substitutions in COVID-19 patients who were infected with SARS-CoV-2 early in the pandemic. Here we demonstrated that the SARS-CoV-2 multi-antigen protein microarray is a powerful tool for detailed characterization of antibody responses, with potential utility in understanding the disease progress and assessing current vaccines and therapies against evolving SARS-CoV-2.
    Keywords Medicine ; R ; Science ; Q
    Subject code 616
    Language English
    Publishing date 2023-01-01T00:00:00Z
    Publisher Public Library of Science (PLoS)
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  3. Article ; Online: SARS-CoV-2 multi-antigen protein microarray for detailed characterization of antibody responses in COVID-19 patients.

    Alev Celikgil / Aldo B Massimi / Antonio Nakouzi / Natalia G Herrera / Nicholas C Morano / James H Lee / Hyun Ah Yoon / Scott J Garforth / Steven C Almo

    PLoS ONE, Vol 18, Iss 2, p e

    2023  Volume 0276829

    Abstract: Antibodies against severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) target multiple epitopes on different domains of the spike protein, and other SARS-CoV-2 proteins. We developed a SARS-CoV-2 multi-antigen protein microarray with the ... ...

    Abstract Antibodies against severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) target multiple epitopes on different domains of the spike protein, and other SARS-CoV-2 proteins. We developed a SARS-CoV-2 multi-antigen protein microarray with the nucleocapsid, spike and its domains (S1, S2), and variants with single (D614G, E484K, N501Y) or double substitutions (N501Y/Deletion69/70), allowing a more detailed high-throughput analysis of the antibody repertoire following infection. The assay was demonstrated to be reliable and comparable to ELISA. We analyzed antibodies from 18 COVID-19 patients and 12 recovered convalescent donors. The S IgG level was higher than N IgG in most of the COVID-19 patients, and the receptor-binding domain of S1 showed high reactivity, but no antibodies were detected against the heptad repeat domain 2 of S2. Furthermore, antibodies were detected against S variants with single and double substitutions in COVID-19 patients who were infected with SARS-CoV-2 early in the pandemic. Here we demonstrated that the SARS-CoV-2 multi-antigen protein microarray is a powerful tool for detailed characterization of antibody responses, with potential utility in understanding the disease progress and assessing current vaccines and therapies against evolving SARS-CoV-2.
    Keywords Medicine ; R ; Science ; Q
    Subject code 616
    Language English
    Publishing date 2023-01-01T00:00:00Z
    Publisher Public Library of Science (PLoS)
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  4. Article ; Online: Neonicotinoid pesticides exert metabolic effects on avian pollinators.

    English, Simon G / Sandoval-Herrera, Natalia I / Bishop, Christine A / Cartwright, Melissa / Maisonneuve, France / Elliott, John E / Welch, Kenneth C

    Scientific reports

    2021  Volume 11, Issue 1, Page(s) 2914

    Abstract: Neonicotinoids are neurotoxic systemic insecticides applied extensively worldwide. The impacts of common neonicotinoids like imidacloprid on non-target invertebrate pollinators have been widely studied, however effects on vertebrate pollinators have ... ...

    Abstract Neonicotinoids are neurotoxic systemic insecticides applied extensively worldwide. The impacts of common neonicotinoids like imidacloprid on non-target invertebrate pollinators have been widely studied, however effects on vertebrate pollinators have received little attention. Here, we describe the first study evaluating the effects of short-term (3 d) exposure to a range of environmentally relevant concentrations ([Formula: see text] to [Formula: see text]Body Weight) of imidacloprid on wild-caught ruby-throated hummingbirds. Within 2 h of exposure, hummingbirds exhibited a significant depression in energy expenditure (up to [Formula: see text]). We did not observe significant effects on foraging behaviour measured in the subsequent 2 h to 4 h, although the effect size estimate was large (0.29). We also analyzed tissues collected 24 h after the final dose and did not observe significant effects on immune response or cholinesterase activity, although this may be related to our small sample size. We determined that hummingbirds excrete imidacloprid quickly (elimination half-life of [Formula: see text]) relative to other bird species. Hummingbirds have high energetic demands and store relatively little energy, especially during migration and breeding seasons. Therefore, changes in their metabolism following exposures to imidacloprid observed herein could bear important survivorship consequences for hummingbirds.
    MeSH term(s) Animals ; Birds/metabolism ; Male ; Neonicotinoids/toxicity ; Nitro Compounds/toxicity ; Pesticides/toxicity ; Pollination ; Toxicity Tests, Subacute
    Chemical Substances Neonicotinoids ; Nitro Compounds ; Pesticides ; imidacloprid (3BN7M937V8)
    Language English
    Publishing date 2021-02-03
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2615211-3
    ISSN 2045-2322 ; 2045-2322
    ISSN (online) 2045-2322
    ISSN 2045-2322
    DOI 10.1038/s41598-021-82470-3
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article ; Online: Neonicotinoid pesticides exert metabolic effects on avian pollinators

    Simon G. English / Natalia I. Sandoval-Herrera / Christine A. Bishop / Melissa Cartwright / France Maisonneuve / John E. Elliott / Kenneth C. Welch

    Scientific Reports, Vol 11, Iss 1, Pp 1-

    2021  Volume 11

    Abstract: ... concentrations ( $${0.2}\,\upmu \hbox {g g}^{-1}$$ 0.2 μ g g - 1 to $${2.5}\,\upmu \hbox {g g}^{-1}\cdot$$ 2.5 μ ... g g - 1 · Body Weight) of imidacloprid on wild-caught ruby-throated hummingbirds. Within 2 h ...

    Abstract Abstract Neonicotinoids are neurotoxic systemic insecticides applied extensively worldwide. The impacts of common neonicotinoids like imidacloprid on non-target invertebrate pollinators have been widely studied, however effects on vertebrate pollinators have received little attention. Here, we describe the first study evaluating the effects of short-term (3 d) exposure to a range of environmentally relevant concentrations ( $${0.2}\,\upmu \hbox {g g}^{-1}$$ 0.2 μ g g - 1 to $${2.5}\,\upmu \hbox {g g}^{-1}\cdot$$ 2.5 μ g g - 1 · Body Weight) of imidacloprid on wild-caught ruby-throated hummingbirds. Within 2 h of exposure, hummingbirds exhibited a significant depression in energy expenditure (up to $$25\% \pm 11\%$$ 25 % ± 11 % ). We did not observe significant effects on foraging behaviour measured in the subsequent 2 h to 4 h, although the effect size estimate was large (0.29). We also analyzed tissues collected 24 h after the final dose and did not observe significant effects on immune response or cholinesterase activity, although this may be related to our small sample size. We determined that hummingbirds excrete imidacloprid quickly (elimination half-life of $$2.1\hbox { h} \pm 0.1\hbox { h}$$ 2.1 h ± 0.1 h ) relative to other bird species. Hummingbirds have high energetic demands and store relatively little energy, especially during migration and breeding seasons. Therefore, changes in their metabolism following exposures to imidacloprid observed herein could bear important survivorship consequences for hummingbirds.
    Keywords Medicine ; R ; Science ; Q
    Language English
    Publishing date 2021-02-01T00:00:00Z
    Publisher Nature Portfolio
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  6. Article ; Online: Immunogenicity and reactogenicity of a third dose of BNT162b2 vaccine for COVID-19 after a primary regimen with BBIBP-CorV or BNT162b2 vaccines in Lima, Peru.

    Vargas-Herrera, Natalia / Fernández-Navarro, Manuel / Cabezudo, Nestor E / Soto-Becerra, Percy / Solís-Sánchez, Gilmer / Escobar-Agreda, Stefan / Silva-Valencia, Javier / Pampa-Espinoza, Luis / Bado-Pérez, Ricardo / Solari, Lely / Araujo-Castillo, Roger V

    PloS one

    2022  Volume 17, Issue 10, Page(s) e0268419

    Abstract: Background: The administration of a third (booster) dose of COVID-19 vaccines in Peru initially employed the BNT162b2 (Pfizer) mRNA vaccine. The national vaccination program started with healthcare workers (HCW) who received BBIBP-CorV (Sinopharm) ... ...

    Abstract Background: The administration of a third (booster) dose of COVID-19 vaccines in Peru initially employed the BNT162b2 (Pfizer) mRNA vaccine. The national vaccination program started with healthcare workers (HCW) who received BBIBP-CorV (Sinopharm) vaccine as primary regimen and elderly people previously immunized with BNT162b2. This study evaluated the reactogenicity and immunogenicity of the "booster" dose in these two groups in Lima, Peru.
    Methods: We conducted a prospective cohort study, recruiting participants from November to December of 2021 in Lima, Peru. We evaluated immunogenicity and reactogenicity in HCW and elderly patients previously vaccinated with either two doses of BBIBP-CorV (heterologous regimen) or BTN162b2 (homologous regimen). Immunogenicity was measured by anti-SARS-CoV-2 IgG antibody levels immediately before boosting dose and 14 days later. IgG geometric means (GM) and medians were obtained, and modeled using ANCOVA and quantile regressions.
    Results: The GM of IgG levels increased significantly after boosting: from 28.5±5.0 AU/mL up to 486.6±1.2 AU/mL (p<0.001) which corresponds to a 17-fold increase. The heterologous vaccine regimen produced higher GM of post-booster anti-SARS-CoV-2 IgG levels, eliciting a 13% increase in the geometric mean ratio (95%CI: 1.02-1.27) and a median difference of 92.3 AU/ml (95%CI: 24.9-159.7). Both vaccine regimens were safe and well tolerated. Previous COVID-19 infection was also associated with higher pre and post-booster IgG GM levels.
    Conclusion: Although both boosting regimens were highly immunogenic, two doses of BBIBP-CorV boosted with BTN162b2 produced a stronger IgG antibody response than the homologous BNT162b2 regimen in the Peruvian population. Additionally, both regimens were mildly reactogenic and well-tolerated.
    MeSH term(s) Aged ; Antibodies, Viral ; BNT162 Vaccine ; COVID-19/prevention & control ; COVID-19 Vaccines/adverse effects ; Humans ; Immunization, Secondary ; Immunogenicity, Vaccine ; Immunoglobulin G ; Peru ; Prospective Studies ; Vaccines, Synthetic ; mRNA Vaccines
    Chemical Substances Antibodies, Viral ; COVID-19 Vaccines ; Immunoglobulin G ; Vaccines, Synthetic ; mRNA Vaccines ; BNT162 Vaccine (N38TVC63NU)
    Language English
    Publishing date 2022-10-17
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2267670-3
    ISSN 1932-6203 ; 1932-6203
    ISSN (online) 1932-6203
    ISSN 1932-6203
    DOI 10.1371/journal.pone.0268419
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  7. Article ; Online: Antimicrobial Susceptibility of Neisseria gonorrhoeae Isolates From Peru, 2018 and 2019.

    Jorge-Berrocal, Ana / Vargas-Herrera, Natalia / Benites, Carlos / Salazar-Quispe, Fabiola / Mayta-Barrios, Maritza / Barrios-Cárdenas, Yuli J / Melano, Roberto G / Yagui, Martin

    Sexually transmitted diseases

    2022  Volume 49, Issue 10, Page(s) 682–686

    Abstract: Background: Currently, in Latin America, including Peru, the treatment of gonorrhea is still empiric and information regarding antimicrobial resistance is scarce in some countries because of the limited resources, which can contribute to the rising ... ...

    Abstract Background: Currently, in Latin America, including Peru, the treatment of gonorrhea is still empiric and information regarding antimicrobial resistance is scarce in some countries because of the limited resources, which can contribute to the rising rates of reported multidrug-resistant gonococcal strains. In that context, it is mandatory to continuously monitor and report antimicrobial resistance in N. gonorrhoeae to update treatment recommendations.
    Methods: This descriptive study analyzed genital and anal samples from symptomatic patients who attended 15 sexually transmitted infections health facilities from 8 different regions in Peru during the years 2018 to 2019 within the framework of Sentinel Surveillance. After establishing the presumptive diagnosis, the isolates were sent to the Laboratory of Sexually Transmitted Bacteria of the National Institute of Health of Peru in Lima where the species were confirmed (N = 165) and susceptibility profiles were determined.
    Results: Among the 165 isolates, 95.2% corresponded to male patients, between 18 and 22 years of age (40.6%), half reported having a sexual partner and being heterosexual. Clinically, 89.7% manifested the presence of urethral exudate. Microbiology showed 95.2% of the isolates resistant to ciprofloxacin and 9.1% non-susceptible to azithromycin. Reduced susceptibility to ceftriaxone and cefixime was observed in 1.2% and 3.6% of the isolates respectively. All strains tested were susceptible to spectinomycin.
    Conclusions: This study demonstrated that in Peru, fluoroquinolones should not be recommended or used in N. gonorrhoeae infections due to the high percentage of resistant strains. In addition, nationwide access to gonococcal resistance testing, molecular diagnostics and antimicrobial stewardship should be implemented to control the spread of gonococcal antimicrobial resistance.
    MeSH term(s) Anti-Bacterial Agents/pharmacology ; Azithromycin/pharmacology ; Azithromycin/therapeutic use ; Cefixime ; Ceftriaxone ; Ciprofloxacin ; Drug Resistance, Bacterial ; Fluoroquinolones ; Gonorrhea/drug therapy ; Gonorrhea/epidemiology ; Gonorrhea/microbiology ; Humans ; Male ; Microbial Sensitivity Tests ; Neisseria gonorrhoeae ; Peru/epidemiology ; Spectinomycin
    Chemical Substances Anti-Bacterial Agents ; Fluoroquinolones ; Ciprofloxacin (5E8K9I0O4U) ; Ceftriaxone (75J73V1629) ; Azithromycin (83905-01-5) ; Spectinomycin (93AKI1U6QF) ; Cefixime (97I1C92E55)
    Language English
    Publishing date 2022-07-21
    Publishing country United States
    Document type Journal Article
    ZDB-ID 435191-5
    ISSN 1537-4521 ; 0148-5717
    ISSN (online) 1537-4521
    ISSN 0148-5717
    DOI 10.1097/OLQ.0000000000001678
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  8. Article ; Online: Real-world evidence of off-label use of commercially automated insulin delivery systems compared to multiple daily insulin injections in pregnancies complicated by type 1 diabetes.

    Quirós, Carmen / Herrera, Maria Teresa / Amigó, Judit / Wagner, Ana / Beato-Vibora, Pilar I / Azriel, Sharona / Climent, Elisenda / Soldevila, Berta / Barquiel, Beatriz / Colomo, Natalia / Durán-Martínez, María / Corcoy, Rosa / Codina, Mercedes / Díaz-Soto, Gonzalo / Márquez-Pardo, Rosa / Martínez-Brocca, María Asunción / Rebollo Román, Ángel / López Gallardo, Gema / Cuesta, Martín /
    García Fernández, Javier / Goya, María Mar / Vega Guedes, Begoña / Mendoza-Mathison, Lillian C / Perea, Verónica

    Diabetes technology & therapeutics

    2024  

    Abstract: ... to have higher birthweight (βadjusted 279.0 g, 95% CI 39.5-518.5) and macrosomia (ORadjusted 3.18, 95% CI ...

    Abstract Aims: To compare glycemic control and maternal-fetal outcomes of women with type 1 diabetes (T1D) using hybrid closed loop (HCL) vs. multiple daily insulin injections (MDI) plus continuous glucose monitoring (CGM).
    Methods: Multicenter prospective cohort study of pregnant women with T1D in Spain. We evaluated HbA1c and time spent within (TIR), below (TBR) and above (TAR) the pregnancy-specific glucose range 3.5-7.8 mmol/L. Adjusted models were performed for adverse pregnancy outcomes including baseline maternal characteristics and center.
    Results: 112 women were included (HCL n=59). Women in the HCL group had a longer duration of diabetes and higher rates of prepregnancy care. There were no between-group differences in HbA1c in any trimester. However, in the second trimester, MDI users had a greater decrease in HbA1c (-6.12±9.06 vs. -2.16 ±7.42 mmol/mol, p=0.031). No differences in TIR (3.5-7.8 mmol/L) and TAR were observed between HCL and MDI users, but with a higher total insulin dose in the second trimester (+0.13 IU/Kg/d). HCL therapy was associated with increased maternal weight gain during pregnancy (βadjusted 3.20 kg, 95%CI 0.90-5.50). Regarding neonatal outcomes, newborns of HCL users were more likely to have higher birthweight (βadjusted 279.0 g, 95% CI 39.5-518.5) and macrosomia (ORadjusted 3.18, 95% CI 1.05-9.67) compared to MDI users. These associations disappeared when maternal weight gain or third trimester HbA1c were included in the models.
    Conclusions: In a real-world setting, HCL users gained more weight during pregnancy and had larger newborns than MDI users, while achieving similar glycemic control in terms of HbA1c and TIR.
    Language English
    Publishing date 2024-02-28
    Publishing country United States
    Document type Journal Article
    ZDB-ID 1452816-2
    ISSN 1557-8593 ; 1520-9156
    ISSN (online) 1557-8593
    ISSN 1520-9156
    DOI 10.1089/dia.2023.0594
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  9. Article: Geobiology of Andean Microbial Ecosystems Discovered in Salar de Atacama, Chile.

    Vignale, Federico A / Kurth, Daniel / Lencina, Agustina I / Poiré, Daniel G / Chihuailaf, Elizabeth / Muñoz-Herrera, Natalia C / Novoa, Fernando / Contreras, Manuel / Turjanski, Adrián G / Farías, María E

    Frontiers in microbiology

    2021  Volume 12, Page(s) 762076

    Abstract: The Salar de Atacama in the Chilean Central Andes harbors unique microbial ecosystems due to extreme environmental conditions, such as high altitude, low oxygen pressure, high solar radiation, and high salinity. Combining X-ray diffraction analyses, ... ...

    Abstract The Salar de Atacama in the Chilean Central Andes harbors unique microbial ecosystems due to extreme environmental conditions, such as high altitude, low oxygen pressure, high solar radiation, and high salinity. Combining X-ray diffraction analyses, scanning electron microscopy and molecular diversity studies, we have characterized twenty previously unexplored Andean microbial ecosystems in eight different lakes and wetlands from the middle-east and south-east regions of this salt flat. The mats and microbialites studied are mainly formed by calcium carbonate (aragonite and calcite) and halite, whereas the endoevaporites are composed predominantly of gypsum and halite. The carbonate-rich mats and microbialites are dominated by
    Language English
    Publishing date 2021-10-28
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2587354-4
    ISSN 1664-302X
    ISSN 1664-302X
    DOI 10.3389/fmicb.2021.762076
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  10. Article ; Online: Deglycosylated RBD produced in Pichia pastoris as a low-cost sera COVID-19 diagnosis tool and a vaccine candidate.

    Idrovo-Hidalgo, Tommy / Pignataro, María F / Bredeston, Luis M / Elias, Fernanda / Herrera, María G / Pavan, María F / Foscaldi, Sabrina / Suireszcz, Mayra / Fernández, Natalia B / Wetzler, Diana E / Paván, Carlos H / Craig, Patricio O / Roman, Ernesto A / Ruberto, Lucas A M / Noseda, Diego G / Ibañez, Lorena I / Czibener, Cecilia / Ugalde, Juan E / Nadra, Alejandro D /
    Santos, Javier / D'Alessio, Cecilia

    Glycobiology

    2023  Volume 34, Issue 1

    Abstract: During the COVID-19 outbreak, numerous tools including protein-based vaccines have been developed. The methylotrophic yeast Pichia pastoris (synonymous to Komagataella phaffii) is an eukaryotic cost-effective and scalable system for recombinant protein ... ...

    Abstract During the COVID-19 outbreak, numerous tools including protein-based vaccines have been developed. The methylotrophic yeast Pichia pastoris (synonymous to Komagataella phaffii) is an eukaryotic cost-effective and scalable system for recombinant protein production, with the advantages of an efficient secretion system and the protein folding assistance of the secretory pathway of eukaryotic cells. In a previous work, we compared the expression of SARS-CoV-2 Spike Receptor Binding Domain in P. pastoris with that in human cells. Although the size and glycosylation pattern was different between them, their protein structural and conformational features were indistinguishable. Nevertheless, since high mannose glycan extensions in proteins expressed by yeast may be the cause of a nonspecific immune recognition, we deglycosylated RBD in native conditions. This resulted in a highly pure, homogenous, properly folded and monomeric stable protein. This was confirmed by circular dichroism and tryptophan fluorescence spectra and by SEC-HPLC, which were similar to those of RBD proteins produced in yeast or human cells. Deglycosylated RBD was obtained at high yields in a single step, and it was efficient in distinguishing between SARS-CoV-2-negative and positive sera from patients. Moreover, when the deglycosylated variant was used as an immunogen, it elicited a humoral immune response ten times greater than the glycosylated form, producing antibodies with enhanced neutralizing power and eliciting a more robust cellular response. The proposed approach may be used to produce at a low cost, many antigens that require glycosylation to fold and express, but do not require glycans for recognition purposes.
    MeSH term(s) Humans ; COVID-19/diagnosis ; COVID-19/prevention & control ; COVID-19 Testing ; Pichia/genetics ; Pichia/metabolism ; SARS-CoV-2/genetics ; SARS-CoV-2/metabolism ; Recombinant Proteins/chemistry ; Vaccines/metabolism ; Antibodies, Neutralizing/metabolism ; Antibodies, Viral ; Saccharomycetales
    Chemical Substances Recombinant Proteins ; Vaccines ; Antibodies, Neutralizing ; Antibodies, Viral
    Language English
    Publishing date 2023-12-07
    Publishing country England
    Document type Journal Article
    ZDB-ID 1067689-2
    ISSN 1460-2423 ; 0959-6658
    ISSN (online) 1460-2423
    ISSN 0959-6658
    DOI 10.1093/glycob/cwad089
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