Extensive study of HIV+ individuals in recent years has brought to light many examples of antibodies that can neutralize a broad range of HIV strains and protect against viral challenge in animal models of infection. The portion of viral surface most commonly targeted by such antibodies is now known to be the ?high-mannose patch?: among patients producing broadly-neutralizing antibodies, 38% target this one region of the virus. One of the most potent high mannose patch antibodies, PGT128, binds to a particular arrangement of high-mannose glycans and conserved peptide residues. Our goal is to develop vaccine immunogens which mimic this arrangement precisely and be used to elicit PGT128-like antibodies. Our approach will utilize unique directed evolution methods to develop glycoimmunogens in which PGT128 epitope elements are correctly reconstituted. It is also possible that additional immunogens will be required to correctly prime the immune response by stimulating germline precursors of PGT128. Therefore, we will develop glycopeptides targeting both mature and germline PGT128 antibodies. In collaboration with David Nemazee at Scripps, we will investigate the ability of these glycopeptides in combination, to activate a germline PGT128 response that can mature into a response with broadly- neutralizing PGT128-like specificity.

Agency
National Institute of Health (NIH)
Institute
National Institute of Allergy and Infectious Diseases (NIAID)
Type
Research Project (R01)
Project #
5R01AI090745-06
Application #
9838135
Study Section
HIV/AIDS Vaccines Study Section (VACC)
Program Officer
Malaspina, Angela
Project Start
2010-06-01
Project End
2022-11-30
Budget Start
2019-12-01
Budget End
2020-11-30
Support Year
6
Fiscal Year
2020
Total Cost
Indirect Cost
Name
Brandeis University
Department
Chemistry
Type
Schools of Arts and Sciences
DUNS #
616845814
City
Waltham
State
MA
Country
United States
Zip Code
02453
MacPherson, I S; Temme, J S; Krauss, I J (2017) DNA display of folded RNA libraries enabling RNA-SELEX without reverse transcription. Chem Commun (Camb) 53:2878-2881
Horiya, Satoru; Bailey, Jennifer K; Krauss, Isaac J (2017) Directed Evolution of Glycopeptides Using mRNA Display. Methods Enzymol 597:83-141
Krauss, Isaac J (2016) Antibody recognition of HIV and dengue glycoproteins. Glycobiology 26:813-9
Bailey, Jennifer K; Nguyen, Dung N; Horiya, Satoru et al. (2016) Synthesis of multivalent glycopeptide conjugates that mimic an HIV epitope. Tetrahedron 72:6091-6098
Temme, J Sebastian; Krauss, Isaac J (2015) SELMA: Selection with Modified Aptamers. Curr Protoc Chem Biol 7:73-92
Horiya, Satoru; Bailey, Jennifer K; Temme, J Sebastian et al. (2014) Directed evolution of multivalent glycopeptides tightly recognized by HIV antibody 2G12. J Am Chem Soc 136:5407-15
Horiya, Satoru; MacPherson, Iain S; Krauss, Isaac J (2014) Recent strategies targeting HIV glycans in vaccine design. Nat Chem Biol 10:990-9
Temme, J Sebastian; MacPherson, Iain S; DeCourcey, John F et al. (2014) High temperature SELMA: evolution of DNA-supported oligomannose clusters which are tightly recognized by HIV bnAb 2G12. J Am Chem Soc 136:1726-9
Temme, J Sebastian; Drzyzga, Michael G; MacPherson, Iain S et al. (2013) Directed evolution of 2G12-targeted nonamannose glycoclusters by SELMA. Chemistry 19:17291-5
MacPherson, Iain S; Temme, J Sebastian; Habeshian, Sevan et al. (2011) Multivalent glycocluster design through directed evolution. Angew Chem Int Ed Engl 50:11238-42