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Das S, Parray HA, Chiranjivi AK, Kumar P, Goswami A, Bansal M, Rathore DK, Kumar R, Samal S. Kennedy Epitope (KE)-dependent Retrograde Transport of Efficiently Cleaved HIV-1 Envelopes (Envs) and its Effect on Env Cell Surface Expression and Viral Particle Formation. Protein J 2024; 43:375-386. [PMID: 37794304 DOI: 10.1007/s10930-023-10161-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 09/23/2023] [Indexed: 10/06/2023]
Abstract
Efficiently cleaved HIV-1 Envs are the closest mimics of functional Envs as they specifically expose only bNAb (broadly neutralizing antibody) epitopes and not non-neutralizing ones, making them suitable for developing vaccine immunogens. We have previously identified several efficiently cleaved Envs from clades A, B, C and B/C. We also described that truncation of the CT (C-terminal tail) of a subset of these Envs, but not others, impairs their ectodomain conformation/antigenicity on the cell surface in a CT conserved hydrophilic domain (CHD) or Kennedy epitope (KE)-dependent manner. Here, we report that those Envs (4 - 2.J41 and JRCSF), whose native-like ectodomain conformation/antigenicity on the cell surface is disrupted upon CT truncation, but not other Envs like JRFL, whose CT truncation does not have an effect on ectodomain integrity on the cell surface, are also defective in retrograde transport from early to late endosomes. Restoration of the CHD/KE in the CT of these Envs restores wild-type levels of distribution between early and late endosomes. In the presence of retrograde transport inhibitor Retro 2, cell surface expression of 4 - 2.J41 and JRCSF Envs increases [as does in the presence of Rab7a DN and Rab7b DN (DN: dominant negative)] but particle formation decreases for 4 - 2.J41 and JRCSF Env pseudotyped viruses. Our results show for the first time a correlation between CT-dependent, CHD/KE regulated retrograde transport and cell surface expression/viral particle formation of these efficiently cleaved Envs. Based on our results we hypothesize that a subset of these efficiently cleaved Envs use a CT-dependent, CHD/KE-mediated mechanism for assembly and release from late endosomes.
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Affiliation(s)
- Supratik Das
- Infection and Immunology, Translational Research Program, 3rd Milestone, Faridabad-Gurgaon Expressway, PO box #04, Faridabad, 121001, Haryana, India.
- Translational Health Science and Technology Institute, NCR Biotech Science Cluster, 3rd Milestone, Faridabad-Gurgaon Expressway, PO box #04, Faridabad, 121001, Haryana, India.
| | - Hilal Ahmad Parray
- Infection and Immunology, Translational Research Program, 3rd Milestone, Faridabad-Gurgaon Expressway, PO box #04, Faridabad, 121001, Haryana, India
| | - Adarsh Kumar Chiranjivi
- Infection and Immunology, Translational Research Program, 3rd Milestone, Faridabad-Gurgaon Expressway, PO box #04, Faridabad, 121001, Haryana, India
| | - Prince Kumar
- Infection and Immunology, Translational Research Program, 3rd Milestone, Faridabad-Gurgaon Expressway, PO box #04, Faridabad, 121001, Haryana, India
| | - Abhishek Goswami
- Infection and Immunology, Translational Research Program, 3rd Milestone, Faridabad-Gurgaon Expressway, PO box #04, Faridabad, 121001, Haryana, India
| | - Manish Bansal
- Translational Health Science and Technology Institute, NCR Biotech Science Cluster, 3rd Milestone, Faridabad-Gurgaon Expressway, PO box #04, Faridabad, 121001, Haryana, India
| | - Deepak Kumar Rathore
- Infection and Immunology, Translational Research Program, 3rd Milestone, Faridabad-Gurgaon Expressway, PO box #04, Faridabad, 121001, Haryana, India
| | - Rajesh Kumar
- Department of Biosciences and Bioengineering, Indian Institute of Technology - Roorkee, Roorkee, Uttarakhand, 247667, India
| | - Sweety Samal
- Infection and Immunology, Translational Research Program, 3rd Milestone, Faridabad-Gurgaon Expressway, PO box #04, Faridabad, 121001, Haryana, India
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Generation of soluble, cleaved, well-ordered, native-like dimers of dengue virus 4 envelope protein ectodomain (sE) suitable for vaccine immunogen design. Int J Biol Macromol 2022; 217:19-26. [PMID: 35817240 DOI: 10.1016/j.ijbiomac.2022.07.028] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2021] [Revised: 11/12/2021] [Accepted: 07/04/2022] [Indexed: 11/24/2022]
Abstract
Dengue virus is transmitted by Aedes mosquitoes and dengue is endemic in many regions of the world. Severe dengue results in complications that may lead to death. Although some vaccine candidates are in clinical trials and one vaccine Dengvaxia, with restricted efficacy, is available, there are currently no specific therapies to completely prevent or treat dengue. The dengue virus structural protein E (envelope) exists as a head-to-tail dimer on mature virus, is targeted by broadly neutralizing antibodies and is suitable for developing vaccine immunogens. Here, we have used a redesigned dengue prME expression construct and immunoaffinity chromatography with conformational/quaternary antibody A11 to purify soluble DENV4 sE(A259C) (E ectodomain) dimers from mammalian expression system to ~99 % purity. These dimers retain glycosylation reported for native DENV E, display the three major broadly neutralizing antibody epitopes, and form well-ordered structure. This strategy can be used for developing subunit vaccine candidates against dengue and other flaviviruses.
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Perween R, PraveenKumar M, Shrivastava T, Parray HA, Singh V, Singh S, Chiranjivi A, Jakhar K, Sonar S, Tiwari M, Reema, Panchal AK, Sharma C, Rathore DK, Ahamed S, Samal S, Mani S, Bhattacharyya S, Das S, Luthra K, Kumar R. The SARS CoV-2 spike directed non-neutralizing polyclonal antibodies cross-react with Human immunodeficiency virus (HIV-1) gp41. Int Immunopharmacol 2021; 101:108187. [PMID: 34649114 PMCID: PMC8479463 DOI: 10.1016/j.intimp.2021.108187] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2021] [Revised: 09/20/2021] [Accepted: 09/20/2021] [Indexed: 12/24/2022]
Abstract
Cross-reactivity among the two diverse viruses is believed to originate from the concept of antibodies recognizing similar epitopes on the two viral surfaces. Cross-reactive antibody responses have been seen in previous variants of SARS and SARS-CoV-2, but little is known about the cross reactivity with other similar RNA viruses like HIV-1. In the present study, we examined the reactivity the SARS-CoV-2 directed antibodies, via spike, immunized mice sera and demonstrated whether they conferred any cross-reactive neutralization against HIV-1. Our findings show that SARS-CoV-2 spike immunized mice antibodies cross-react with the HIV-1 Env protein. Cross-neutralization among the two viruses is uncommon, suggesting the presence of a non-neutralizing antibody response to conserved epitopes amongst the two viruses. Our results indicate, that SARS-CoV-2 spike antibody cross reactivity is targeted towards the gp41 region of the HIV-1 Env (gp160) protein. Overall, our investigation not only answers a crucial question about the understanding of cross-reactive epitopes of antibodies generated in different viral infections, but also provides critical evidence for developing vaccine immunogens and novel treatment strategies with enhanced efficacy capable of recognising diverse pathogens with similar antigenic features.
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Affiliation(s)
- Reshma Perween
- Translational Health Science & Technology Institute, NCR Biotech Science Cluster, Faridabad, Haryana 121001, India
| | - Murugavelu PraveenKumar
- Translational Health Science & Technology Institute, NCR Biotech Science Cluster, Faridabad, Haryana 121001, India
| | - Tripti Shrivastava
- Translational Health Science & Technology Institute, NCR Biotech Science Cluster, Faridabad, Haryana 121001, India
| | - Hilal Ahmed Parray
- Translational Health Science & Technology Institute, NCR Biotech Science Cluster, Faridabad, Haryana 121001, India
| | - Vanshika Singh
- Translational Health Science & Technology Institute, NCR Biotech Science Cluster, Faridabad, Haryana 121001, India
| | - Swarandeep Singh
- Department of Biochemistry, All India Institute of Medical Sciences, New Delhi, India
| | - Adarsh Chiranjivi
- Translational Health Science & Technology Institute, NCR Biotech Science Cluster, Faridabad, Haryana 121001, India
| | - Kamini Jakhar
- Translational Health Science & Technology Institute, NCR Biotech Science Cluster, Faridabad, Haryana 121001, India
| | - Sudipta Sonar
- Translational Health Science & Technology Institute, NCR Biotech Science Cluster, Faridabad, Haryana 121001, India
| | - Mahima Tiwari
- Translational Health Science & Technology Institute, NCR Biotech Science Cluster, Faridabad, Haryana 121001, India
| | - Reema
- Translational Health Science & Technology Institute, NCR Biotech Science Cluster, Faridabad, Haryana 121001, India
| | - Anil Kumar Panchal
- Translational Health Science & Technology Institute, NCR Biotech Science Cluster, Faridabad, Haryana 121001, India
| | - Chandresh Sharma
- Translational Health Science & Technology Institute, NCR Biotech Science Cluster, Faridabad, Haryana 121001, India
| | - Deepak Kumar Rathore
- Translational Health Science & Technology Institute, NCR Biotech Science Cluster, Faridabad, Haryana 121001, India
| | - Shubbir Ahamed
- Translational Health Science & Technology Institute, NCR Biotech Science Cluster, Faridabad, Haryana 121001, India
| | - Sweety Samal
- Translational Health Science & Technology Institute, NCR Biotech Science Cluster, Faridabad, Haryana 121001, India
| | - Shailendra Mani
- Translational Health Science & Technology Institute, NCR Biotech Science Cluster, Faridabad, Haryana 121001, India
| | - Sankar Bhattacharyya
- Translational Health Science & Technology Institute, NCR Biotech Science Cluster, Faridabad, Haryana 121001, India
| | - Supratik Das
- Translational Health Science & Technology Institute, NCR Biotech Science Cluster, Faridabad, Haryana 121001, India
| | - Kalpana Luthra
- Department of Biochemistry, All India Institute of Medical Sciences, New Delhi, India
| | - Rajesh Kumar
- Translational Health Science & Technology Institute, NCR Biotech Science Cluster, Faridabad, Haryana 121001, India.
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Das S, Kumar R, Ahmed S, Parray HA, Samal S. Efficiently cleaved HIV-1 envelopes: can they be important for vaccine immunogen development? Ther Adv Vaccines Immunother 2020; 8:2515135520957763. [PMID: 33103053 PMCID: PMC7549152 DOI: 10.1177/2515135520957763] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2019] [Accepted: 08/17/2020] [Indexed: 12/31/2022] Open
Abstract
The enormous diversity of HIV-1 is a significant impediment in selecting envelopes (Envs) that can be suitable for designing vaccine immunogens. While tremendous progress has been made in developing soluble, trimeric, native-like Env proteins, those that have elicited neutralizing antibodies (Abs) in animal models are relatively few. A strategy of selecting naturally occurring Envs suitable for immunogen design by studying the correlation between efficient cleavage on the cell surface and their selective binding to broadly neutralizing Abs (bNAbs) and not to non-neutralizing Abs (non-NAbs), properties essential in immunogens, may be useful. Here we discuss some of the challenges of developing an efficacious HIV-1 vaccine and the work done in generating soluble immunogens. We also discuss the study of naturally occurring, membrane-bound, efficiently cleaved (naturally more sensitive to furin) Envs and how they may positively add to the repertoire of HIV-1 Envs that can be used for vaccine immunogen design. However, even with such Envs, the challenges of developing well-folded, native-like trimers as soluble proteins or using other immunogen strategies such as virus-like particles with desirable antigenic properties remain, and are formidable. In spite of the progress that has been made in the HIV-1 vaccine field, an immunogen that elicits neutralizing Abs with significant breadth and potency in vaccines has still not been developed. Efficiently cleaved Envs may increase the number of available Envs suitable for immunogen design and should be studied further.
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Affiliation(s)
- Supratik Das
- THSTI-IAVI HIV Vaccine Design Program,
Translational Health Science and Technology Institute, NCR Biotech Science
Cluster, 3rd Milestone, Faridabad-Gurgaon Expressway, PO Box #04, Faridabad,
Haryana 121001, India
| | - Rajesh Kumar
- Translational Health Science and Technology
Institute, NCR Biotech Science Cluster, Faridabad, Haryana, India
| | - Shubbir Ahmed
- Translational Health Science and Technology
Institute, NCR Biotech Science Cluster, Faridabad, Haryana, India
| | - Hilal Ahmad Parray
- Translational Health Science and Technology
Institute, NCR Biotech Science Cluster, Faridabad, Haryana, India
| | - Sweety Samal
- Translational Health Science and Technology
Institute, NCR Biotech Science Cluster, Faridabad, Haryana, India
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Samal S, Bansal M, Das S. Method to identify efficiently cleaved, membrane-bound, functional HIV-1 (Human Immunodeficiency Virus-1) envelopes. MethodsX 2019; 6:837-849. [PMID: 31049300 PMCID: PMC6484210 DOI: 10.1016/j.mex.2019.04.013] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2018] [Accepted: 04/09/2019] [Indexed: 10/29/2022] Open
Abstract
An ideal vaccine against HIV-1 will specifically elicit bNAbs (broadly neutralizing antibodies) which can cross-neutralize a wide spectrum of circulating viral strains belonging to different clades. The current paradigm for developing such a vaccine is to generate HIV-1 envelope (Env)-based immunogens which can specifically elicit bNAbs. For this purpose, it is necessary to identify Envs, belonging to different clades, suitable for immunogen design. Efficient cleavage of the HIV-1 Env precursor gp160 polypeptide into its constituent subunits determines its ability to selectively bind to bNAbs and poorly to non-NAbs (non-neutralizing antibodies), properties desirable in Env-based immunogens. Thus, efficiently cleaved HIV-1 Envs with desirable antigenic properties can be good candidates for developing immunogens. Here we describe in detail a six step method we have used in our laboratory to identify such efficiently cleaved Envs. Some of these protocols are optimizations of previously reported assays such as FACS-based cell surface antibody binding assay, pseudovirus neutralization assay and gp120 shedding assay. Other protocols like biotinylation-neutravidin-agarose pull-down assay and plasma membrane protein immunoprecipitation assay have been developed by taking inputs from reagent/kit manufacturer's protocols and previous studies. These protocols will help the field in identifying more such Envs which can be used for immunogen development. •Six step process to identify efficiently cleaved, membrane-bound, functional HIV-1 Envs with high degree of repeatability.•Method applicable for characterizing any HIV-1 envelope protein.•New method of immunoprecipitation of plasma membrane fraction to validate efficiently cleaved HIV-1 envelopes.
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Affiliation(s)
- Sweety Samal
- THSTI-IAVI HIV Vaccine Design Program, Translational Health Science and Technology Institute, Faridabad, 121001, Haryana, India
| | - Manish Bansal
- THSTI-IAVI HIV Vaccine Design Program, Translational Health Science and Technology Institute, Faridabad, 121001, Haryana, India
| | - Supratik Das
- THSTI-IAVI HIV Vaccine Design Program, Translational Health Science and Technology Institute, Faridabad, 121001, Haryana, India
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Das S, Bansal M, Bhattacharya J. Characterization of the membrane-bound form of the chimeric, B/C recombinant HIV-1 Env, LT5.J4b12C. J Gen Virol 2018; 99:1438-1443. [PMID: 30129918 DOI: 10.1099/jgv.0.001141] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
Human immunodeficiency virus 1 (HIV-1) diversity is a significant challenge in developing a vaccine against the virus. B/C recombinants have been found in India and other places but are the predominant clade prevalent in China. HIV-1 envelopes (Envs) are the target of broadly neutralizing antibodies (bNAbs) which develop spontaneously in some HIV-1 infected patients. It has been previously reported with efficiently cleaved clade A, B and C Envs that preferential binding of Envs to bNAbs as opposed to non-NAbs, a desirable property for immunogens, is correlated with efficient cleavage of the Env precursor polypeptide into constituent subunits. These Envs are suitable for designing immunogens as soluble proteins, virus-like particles or for delivery by viral vectors/plasmid DNA. However, a B/C recombinant Env with similar properties has not been reported. Here we show that the chimeric, recombinant B/C clade Env LT5.J4b12C is efficiently cleaved on the plasma membrane and selectively binds to bNAbs.
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Affiliation(s)
- Supratik Das
- 1THSTI-IAVI HIV Vaccine Design Program, Translational Health Science and Technology Institute, Faridabad-121001, Haryana, India
| | - Manish Bansal
- 1THSTI-IAVI HIV Vaccine Design Program, Translational Health Science and Technology Institute, Faridabad-121001, Haryana, India
| | - Jayanta Bhattacharya
- 1THSTI-IAVI HIV Vaccine Design Program, Translational Health Science and Technology Institute, Faridabad-121001, Haryana, India.,2International AIDS Vaccine Initiative, New York, USA
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7
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Samal S, Das S, Boliar S, Qureshi H, Shrivastava T, Kumar N, Goswami S, Bansal M, Chakrabarti BK. Cell surface ectodomain integrity of a subset of functional HIV-1 envelopes is dependent on a conserved hydrophilic domain containing region in their C-terminal tail. Retrovirology 2018; 15:50. [PMID: 30029604 PMCID: PMC6053805 DOI: 10.1186/s12977-018-0431-4] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2018] [Accepted: 07/03/2018] [Indexed: 02/05/2023] Open
Abstract
BACKGROUND HIV-1 Env gp160 is cleaved to form gp120 and gp41 and the functional HIV-1 Env is a trimer of non-covalently associated heterodimeric subunits, gp120 and gp41. The cleaved, native, trimeric form of Envs expose only broadly neutralizing antibody (bNAb) epitopes while occluding epitopes targeted by non-neutralizing antibodies (non-NAbs). We and others have previously observed that efficient cleavage of Envs into their constituent subunits co-relates with specific binding to bNAbs and poor binding to non-neutralizing antibodies (non-NAbs). Such Envs have been identified from clades A, B and C which make up a majority of globally circulating HIV-1 strains. Frequently, the C-terminal tail (CT) of Envs is deleted to enhance expression and stabilize soluble Env-based vaccine immunogens. Deletion of CT of efficiently cleaved Indian clade C Env 4-2.J41 results in recognition by both NAbs and non-NAbs. It is to be noted that uncleaved Envs bind to both NAbs and non-NAbs. So we investigated whether altered antigenicity upon CT deletion of efficiently cleaved Envs is due to inefficient cleavage or conformational change as the mechanism by which the CT regulates the ectodomain (ET) integrity is not well understood. RESULTS We studied the effect of CT deletion in four membrane bound efficiently cleaved Envs, A5 (clade A), 4-2.J41 (clade C), JRFL and JRCSF (clade B). Deletion of CT of the Envs, JRCSF and 4-2.J41, but not JRFL and A5 alter their ET antigenicity/conformation without affecting the cleavage efficiency. We carried out a series of deletion mutation in order to determine the region of the CT required for restoring native-like antigenicity/conformation of the ET of 4-2.J41 and JRCSF. Extending the CT up to aa753 in 4-2.J41 and aa759 in JRCSF, which includes a conserved hydrophilic domain (CHD), restores native-like conformation of these Envs on the plasma membrane. However, CT-deletion in 4-2.J41 and JRCSF at the pseudovirus level has either no or only modest effect on neutralization potency. CONCLUSION Here, we report that the CHD in the CT of Env plays an important role in regulating the ET integrity of a subset of efficiently cleaved, functional Envs on the cell surface.
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Affiliation(s)
- Sweety Samal
- THSTI-IAVI HIV Vaccine Design Program, Translational Health Science and Technology Institute, NCR Biotech Science Cluster, 3rd Milestone, Faridabad-Gurgaon Expressway, P.O. Box # 04, Faridabad, Haryana, 1221001, India
| | - Supratik Das
- THSTI-IAVI HIV Vaccine Design Program, Translational Health Science and Technology Institute, NCR Biotech Science Cluster, 3rd Milestone, Faridabad-Gurgaon Expressway, P.O. Box # 04, Faridabad, Haryana, 1221001, India
| | - Saikat Boliar
- THSTI-IAVI HIV Vaccine Design Program, Translational Health Science and Technology Institute, NCR Biotech Science Cluster, 3rd Milestone, Faridabad-Gurgaon Expressway, P.O. Box # 04, Faridabad, Haryana, 1221001, India
| | - Huma Qureshi
- THSTI-IAVI HIV Vaccine Design Program, Translational Health Science and Technology Institute, NCR Biotech Science Cluster, 3rd Milestone, Faridabad-Gurgaon Expressway, P.O. Box # 04, Faridabad, Haryana, 1221001, India
| | - Tripti Shrivastava
- THSTI-IAVI HIV Vaccine Design Program, Translational Health Science and Technology Institute, NCR Biotech Science Cluster, 3rd Milestone, Faridabad-Gurgaon Expressway, P.O. Box # 04, Faridabad, Haryana, 1221001, India
| | - Naresh Kumar
- THSTI-IAVI HIV Vaccine Design Program, Translational Health Science and Technology Institute, NCR Biotech Science Cluster, 3rd Milestone, Faridabad-Gurgaon Expressway, P.O. Box # 04, Faridabad, Haryana, 1221001, India
| | - Sandeep Goswami
- THSTI-IAVI HIV Vaccine Design Program, Translational Health Science and Technology Institute, NCR Biotech Science Cluster, 3rd Milestone, Faridabad-Gurgaon Expressway, P.O. Box # 04, Faridabad, Haryana, 1221001, India
| | - Manish Bansal
- THSTI-IAVI HIV Vaccine Design Program, Translational Health Science and Technology Institute, NCR Biotech Science Cluster, 3rd Milestone, Faridabad-Gurgaon Expressway, P.O. Box # 04, Faridabad, Haryana, 1221001, India
| | - Bimal K Chakrabarti
- THSTI-IAVI HIV Vaccine Design Program, Translational Health Science and Technology Institute, NCR Biotech Science Cluster, 3rd Milestone, Faridabad-Gurgaon Expressway, P.O. Box # 04, Faridabad, Haryana, 1221001, India. .,IAVI Neutralizing Antibody Center, The Scripps Research Institute, La Jolla, CA, USA. .,Innovation & Translation, ABL, Inc., 9800 Medical Center Drive, Building D, Rockville, MD, 20850, USA.
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Shrivastava T, Samal S, Tyagi AK, Goswami S, Kumar N, Ozorowski G, Ward AB, Chakrabarti BK. Envelope proteins of two HIV-1 clades induced different epitope-specific antibody response. Vaccine 2018; 36:1627-1636. [PMID: 29429810 DOI: 10.1016/j.vaccine.2018.01.081] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2017] [Revised: 12/31/2017] [Accepted: 01/29/2018] [Indexed: 11/26/2022]
Abstract
Using HIV-1 envelope protein (Env)-based immunogens that closely mimic the conformation of functional HIV-1 Envs and represent the isolates prevalent in relevant geographical region is considered a rational approach towards developing HIV vaccine. We recently reported that like clade B Env, JRFL, membrane bound Indian clade C Env, 4-2.J41 is also efficiently cleaved and displays desirable antigenic properties for plasmid DNA immunization. Here, we evaluated the immune response in rabbit by injecting the animals with plasmid expressing membrane bound efficiently cleaved 4-2.J41 Env followed by its gp140-foldon (gp140-fd) protein boost. The purified 4-2.J41-gp140-fd protein is recognized by a wide panel of broadly neutralizing antibodies (bNAbs) including the quaternary conformation-dependent antibody, PGT145 with high affinity. We have also evaluated and compared the quality of antibody response elicited in rabbits after immunizing with plasmid DNA expressing the membrane bound efficiently cleaved Env followed by gp140-fd proteins boost with either of clade C Env, 4-2.J41 or clade B Env, JRFL or in combination. In comparison to JRFL group, 4-2.J41 group elicited autologous as well as limited low level cross clade neutralizing antibody response. Preliminary epitope-mapping of sera from animals show that in contrast to JRFL group, no reactivity to either linear peptides or V3-loop is detected in 4-2.J41 group. Furthermore, the presence of conformation-specific antibody in sera from animals immunized with 4-2.J41 Env is observed. However, unlike JRFL group, in 4-2.J41 group of animals, CD4-binding site-directed antibodies cannot be detected. Additionally, we have demonstrated that the quality of antibody response in combination group is guided by JRFL Env-based immunogen suggesting that the selection and the quality of Envs in multicade candidate vaccine are important factors to elicit desirable response.
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Affiliation(s)
- Tripti Shrivastava
- THSTI-IAVI HIV Vaccine Design Program, Translational Health Science and Technology Institute, NCR Biotech Science Cluster, 3rd Milestone, Faridabad-Gurgaon Expressway, P.O. Box # 04, Faridabad-1221001, Haryana, India
| | - Sweety Samal
- THSTI-IAVI HIV Vaccine Design Program, Translational Health Science and Technology Institute, NCR Biotech Science Cluster, 3rd Milestone, Faridabad-Gurgaon Expressway, P.O. Box # 04, Faridabad-1221001, Haryana, India
| | - Ashish K Tyagi
- THSTI-IAVI HIV Vaccine Design Program, Translational Health Science and Technology Institute, NCR Biotech Science Cluster, 3rd Milestone, Faridabad-Gurgaon Expressway, P.O. Box # 04, Faridabad-1221001, Haryana, India
| | - Sandeep Goswami
- THSTI-IAVI HIV Vaccine Design Program, Translational Health Science and Technology Institute, NCR Biotech Science Cluster, 3rd Milestone, Faridabad-Gurgaon Expressway, P.O. Box # 04, Faridabad-1221001, Haryana, India
| | - Naresh Kumar
- THSTI-IAVI HIV Vaccine Design Program, Translational Health Science and Technology Institute, NCR Biotech Science Cluster, 3rd Milestone, Faridabad-Gurgaon Expressway, P.O. Box # 04, Faridabad-1221001, Haryana, India
| | - Gabriel Ozorowski
- Department of Integrative Structural and Computational Biology, Center for HIV/AIDS Vaccine Immunology and Immunogen Discovery, International AIDS Vaccine Initiative Neutralizing Antibody Center and Collaboration for AIDS Vaccine Discovery, The Scripps Research Institute, La Jolla, CA 92037, USA
| | - Andrew B Ward
- Department of Integrative Structural and Computational Biology, Center for HIV/AIDS Vaccine Immunology and Immunogen Discovery, International AIDS Vaccine Initiative Neutralizing Antibody Center and Collaboration for AIDS Vaccine Discovery, The Scripps Research Institute, La Jolla, CA 92037, USA
| | - Bimal K Chakrabarti
- THSTI-IAVI HIV Vaccine Design Program, Translational Health Science and Technology Institute, NCR Biotech Science Cluster, 3rd Milestone, Faridabad-Gurgaon Expressway, P.O. Box # 04, Faridabad-1221001, Haryana, India; IAVI Neutralizing Antibody Center at The Scripps Research Institute, La Jolla, California, USA.
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9
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Das S, Boliar S, Samal S, Ahmed S, Shrivastava T, Shukla BN, Goswami S, Bansal M, Chakrabarti BK. Identification and characterization of a naturally occurring, efficiently cleaved, membrane-bound, clade A HIV-1 Env, suitable for immunogen design, with properties comparable to membrane-bound BG505. Virology 2017; 510:22-28. [PMID: 28689085 DOI: 10.1016/j.virol.2017.07.001] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2017] [Revised: 06/29/2017] [Accepted: 07/02/2017] [Indexed: 10/19/2022]
Abstract
Efficient cleavage of HIV-1 Env gp160 into its constituent subunits correlates with selective binding to neutralizing antibodies and are the closest mimetic of native, functional Envs. This was first demonstrated with the clade B Env, JRFL. The correlation between efficient cleavage and selective binding to neutralizing antibodies is the guiding principle for immunogen design for HIV vaccine. We have recently reported that Envs 4-2.J41 (clade C) and JRCSF (clade B) are also efficiently cleaved and show similar properties. However, an efficiently cleaved, membrane-bound clade A Env suitable for genetic vaccination has not been directly demonstrated. Here we report that BG505 and a new clade A Env, QB726.70M.ENV.C4 (or A5) are efficiently cleaved on cell membrane. A5 shows desirable antigenic properties comparable with BG505 on cell surface. A5SOSIP in supernatant displays majority of bNAb binding epitopes. Thus, both BG505 and A5 Envs can be used in DNA prime-protein boost vaccination studies.
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Affiliation(s)
- Supratik Das
- THSTI-IAVI HIV Vaccine Design Program, Translational Health Science and Technology Institute, 3rd Milestone, Faridabad-Gurgaon Expressway, PO box #04, Faridabad 121001, Haryana, India
| | - Saikat Boliar
- THSTI-IAVI HIV Vaccine Design Program, Translational Health Science and Technology Institute, 3rd Milestone, Faridabad-Gurgaon Expressway, PO box #04, Faridabad 121001, Haryana, India
| | - Sweety Samal
- THSTI-IAVI HIV Vaccine Design Program, Translational Health Science and Technology Institute, 3rd Milestone, Faridabad-Gurgaon Expressway, PO box #04, Faridabad 121001, Haryana, India
| | - Shubbir Ahmed
- THSTI-IAVI HIV Vaccine Design Program, Translational Health Science and Technology Institute, 3rd Milestone, Faridabad-Gurgaon Expressway, PO box #04, Faridabad 121001, Haryana, India
| | - Tripti Shrivastava
- THSTI-IAVI HIV Vaccine Design Program, Translational Health Science and Technology Institute, 3rd Milestone, Faridabad-Gurgaon Expressway, PO box #04, Faridabad 121001, Haryana, India
| | - Brihaspati N Shukla
- THSTI-IAVI HIV Vaccine Design Program, Translational Health Science and Technology Institute, 3rd Milestone, Faridabad-Gurgaon Expressway, PO box #04, Faridabad 121001, Haryana, India
| | - Sandeep Goswami
- THSTI-IAVI HIV Vaccine Design Program, Translational Health Science and Technology Institute, 3rd Milestone, Faridabad-Gurgaon Expressway, PO box #04, Faridabad 121001, Haryana, India
| | - Manish Bansal
- THSTI-IAVI HIV Vaccine Design Program, Translational Health Science and Technology Institute, 3rd Milestone, Faridabad-Gurgaon Expressway, PO box #04, Faridabad 121001, Haryana, India
| | - Bimal K Chakrabarti
- THSTI-IAVI HIV Vaccine Design Program, Translational Health Science and Technology Institute, 3rd Milestone, Faridabad-Gurgaon Expressway, PO box #04, Faridabad 121001, Haryana, India; IAVI Neutralizing Antibody Center at TSRI, La Jolla, CA, USA.
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