Identification of a Clade-Specific  HLA-C*03:02-Restricted Epitope GY9 Derived from the HIV-1 p17 Matrix Protein

Samuel Kyobe; Savannah Mwesigwa; Gyaviira Nkurunungi; Gaone Retshabile; Moses Egesa; Joel Kabali; Grace P Kisitu; Eric Katagirya; Marion Amujal; Misaki Wayengera; Fred Katabazi; Edgar Kigozi; Fahim Yiga; Busisiwe C Mlotshwa; Lesedi Williams; Hakim Sendagire; Sununguko Wata Mpoloka; Moses L Lutaakome Joloba; Dithan Kiragga; Graeme Mardon; Adeodata Kekitiinwa; Mogomotsi Matshaba; Neil A Hanchard; Jacqueline L Kyosiimire; David Robinson

doi:10.20944/preprints202310.0441.v1

How to cite: Kyobe, S.; Mwesigwa, S.; Nkurunungi, G.; Retshabile, G.; Egesa, M.; Kabali, J.; Kisitu, G.P.; Katagirya, E.; Amujal, M.; Wayengera, M.; Katabazi, F.; Kigozi, E.; Yiga, F.; Mlotshwa, B.C.; Williams, L.; Sendagire, H.; Mpoloka, S.W.; Lutaakome Joloba, M.L.; Kiragga, D.; Mardon, G.; Kekitiinwa, A.; Matshaba, M.; Hanchard, N.A.; Kyosiimire, J.L.; Robinson, D. Identification of a Clade-Specific HLA-C*03:02-Restricted Epitope GY9 Derived from the HIV-1 p17 Matrix Protein. Preprints 2023, 2023100441. https://doi.org/10.20944/preprints202310.0441.v1 Kyobe, S.; Mwesigwa, S.; Nkurunungi, G.; Retshabile, G.; Egesa, M.; Kabali, J.; Kisitu, G.P.; Katagirya, E.; Amujal, M.; Wayengera, M.; Katabazi, F.; Kigozi, E.; Yiga, F.; Mlotshwa, B.C.; Williams, L.; Sendagire, H.; Mpoloka, S.W.; Lutaakome Joloba, M.L.; Kiragga, D.; Mardon, G.; Kekitiinwa, A.; Matshaba, M.; Hanchard, N.A.; Kyosiimire, J.L.; Robinson, D. Identification of a Clade-Specific HLA-C*03:02-Restricted Epitope GY9 Derived from the HIV-1 p17 Matrix Protein. Preprints 2023, 2023100441. https://doi.org/10.20944/preprints202310.0441.v1

Abstract

Efforts towards an effective HIV-1 vaccine have remained mainly unsuccessful. There is increasing evidence for a potential role of HLA-C-restricted CD8+ T cell responses in HIV-1 control, including our recent report of HLA-C*03:02 among African children. However, there are no documented optimal HIV-1 CD8+ T cell epitopes restricted by HLA-C*03:02; additionally, the structural influence of HLA-C*03:02 on epitope binding is undetermined. Immunoinformatics approaches provide a fast and inexpensive method to discover HLA-restricted epitopes. Here, we employed immunopeptidomics to identify HLA-C*03:02-restricted CD8+ T cell epitopes. We identified a clade-specific Gag-derived GY9 (GTEELRSLY) HIV-1 p17 matrix epitope exclusively restricted to HLA-C*03:02. Residues E62, T142, and E151 in the HLA-C*03:02 binding groove and positions p3, p6, and p9 on the GY9 epitope are crucial in shaping and stabilizing the epitope binding. Our findings support the growing evidence of the contribution of HLA-C molecules to HIV-1 control and provide a prospect for vaccine strategies.

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Copyright: This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Identification of a Clade-Specific HLA-C*03:02-Restricted Epitope GY9 Derived from the HIV-1 p17 Matrix Protein

Abstract

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