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<dc:title xml:lang="en">Structural and functional study of CPSF6 in HIV-1 nuclear import</dc:title>
<dcterms:alternative xml:lang="fr">Étude structurale et fonctionnelle de CPSF6 dans l'import nucléaire du VIH-1</dcterms:alternative>
<dc:subject xml:lang="fr">HIV-1</dc:subject>
<dc:subject xml:lang="fr">Import nucléaire</dc:subject>
<dc:subject xml:lang="fr">CPSF6</dc:subject>
<dc:subject xml:lang="fr">Capside</dc:subject>
<dc:subject xml:lang="en">HIV-1</dc:subject>
<dc:subject xml:lang="en">Nuclear import</dc:subject>
<dc:subject xml:lang="en">CPSF6</dc:subject>
<dc:subject xml:lang="en">Capsid</dc:subject>
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<dcterms:abstract xml:lang="fr">L'interaction du complexe CPSF5/CPSF6 avec les complexes CA du VIH-1 a été étudiée par cristallographie et cryoEM. Nos résultats montrent que CPSF5 forme un complexe étroit avec CPSF6 in vitro, ce qui peut expliquer le co-recrutement du CPSF5 avec le CPSF6 par le VIH-1 dans les noyaux cellulaires. Des méthodes d'assemblage des complexes CA, de purification de CPSF5/CPSF6 et de purification de la capside virale native ont été développées. CPSF5/CPSF6 peut désassembler la tige CA hyperstable in vitro. CPSF5/CPSF6 forme des complexes avec la tige CA et la capside virale. Nous avons obtenu des structures préliminaires de CPSF5/CPSF6 complexé avec le bâtonnet de CA et avec la capside virale par cryoEM. Nos résultats indiquent que la surexpression de l'isoforme 1 ou de l'isoforme 2 de CPSF5/ CPSF6 dans les cellules HEK293T entraîne une réduction de l'infectivité du VIH-1. D'autres études sont nécessaires pour élucider l'impact de CPSF5/CPSF6 sur l'import et le désassemblage nucléaire du VIH-1.</dcterms:abstract>
<dcterms:abstract xml:lang="en">The interaction of the CPSF5/CPSF6 complex with HIV-1 CA complexes was studied using X-ray crystallography and cryo-EM. Our results show that CPSF5 forms a tight complex with CPSF6 in vitro, which can explain the co-recruitment of CPSF5 with CPSF6 by HIV-1 in cell nuclei. Methods for the assembly of CA complexes, the purification of CPSF5/CPSF6 and the purification of the native viral core have been developed. CPSF5/CPSF6 can disassemble the hyperstable CA_CC rod in vitro. CPSF5/CPSF6 cannot form complex with crosslinked CA hexamer, but forms complex with CA_CC rod and viral core. We have obtained preliminary low-resolution structures of the CPSF5/CPSF6 complexed with CA_CC rod or HIV-1 core.Our findings indicate that overexpression of either isoform 1 or isoform 2 of CPSF5/CPSF6 in HEK293T cells results in a reduction in HIV-1 infectivity. Further investigation is required to elucidate the impact of CPSF5/CPSF6 on HIV-1 nuclear import and uncoating.</dcterms:abstract>
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