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-Structure paper
| タイトル | Structural basis of nanobody recognition of grapevine fanleaf virus and of virus resistance loss. |
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| ジャーナル・号・ページ | Proc Natl Acad Sci U S A, Vol. 117, Issue 20, Page 10848-10855, Year 2020 |
| 掲載日 | 2020年5月19日 |
著者 | Igor Orlov / Caroline Hemmer / Léa Ackerer / Bernard Lorber / Ahmed Ghannam / Vianney Poignavent / Kamal Hleibieh / Claude Sauter / Corinne Schmitt-Keichinger / Lorène Belval / Jean-Michel Hily / Aurélie Marmonier / Véronique Komar / Sophie Gersch / Pascale Schellenberger / Patrick Bron / Emmanuelle Vigne / Serge Muyldermans / Olivier Lemaire / Gérard Demangeat / Christophe Ritzenthaler / Bruno P Klaholz / ![]() |
| PubMed 要旨 | Grapevine fanleaf virus (GFLV) is a picorna-like plant virus transmitted by nematodes that affects vineyards worldwide. Nanobody (Nb)-mediated resistance against GFLV has been created recently, and ...Grapevine fanleaf virus (GFLV) is a picorna-like plant virus transmitted by nematodes that affects vineyards worldwide. Nanobody (Nb)-mediated resistance against GFLV has been created recently, and shown to be highly effective in plants, including grapevine, but the underlying mechanism is unknown. Here we present the high-resolution cryo electron microscopy structure of the GFLV-Nb23 complex, which provides the basis for molecular recognition by the Nb. The structure reveals a composite binding site bridging over three domains of one capsid protein (CP) monomer. The structure provides a precise mapping of the Nb23 epitope on the GFLV capsid in which the antigen loop is accommodated through an induced-fit mechanism. Moreover, we uncover and characterize several resistance-breaking GFLV isolates with amino acids mapping within this epitope, including C-terminal extensions of the CP, which would sterically interfere with Nb binding. Escape variants with such extended CP fail to be transmitted by nematodes linking Nb-mediated resistance to vector transmission. Together, these data provide insights into the molecular mechanism of Nb23-mediated recognition of GFLV and of virus resistance loss. |
リンク | Proc Natl Acad Sci U S A / PubMed:32371486 / PubMed Central |
| 手法 | EM (単粒子) |
| 解像度 | 2.8 Å |
| 構造データ | ![]() PDB-5foj: |
| 由来 |
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キーワード | VIRUS / NANOBODY / COMPLEX |
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grapevine fanleaf virus (ウイルス)
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