+検索条件
-Structure paper
タイトル | Structural basis of receptor usage by the engineered capsid AAV-PHP.eB. |
---|---|
ジャーナル・号・ページ | Mol Ther Methods Clin Dev, Vol. 26, Page 343-354, Year 2022 |
掲載日 | 2022年9月8日 |
著者 | Seongmin Jang / Hao K Shen / Xiaozhe Ding / Timothy F Miles / Viviana Gradinaru / |
PubMed 要旨 | Adeno-associated virus serotype 9 (AAV9) is a promising gene therapy vector for treating neurodegenerative diseases due to its ability to penetrate the blood-brain barrier. PHP.eB was engineered ...Adeno-associated virus serotype 9 (AAV9) is a promising gene therapy vector for treating neurodegenerative diseases due to its ability to penetrate the blood-brain barrier. PHP.eB was engineered from AAV9 by insertion of a 7-amino acid peptide and point mutation of neighboring residues, thereby enhancing potency in the central nervous system. Here, we report a 2.24-Å resolution cryo-electron microscopy structure of PHP.eB, revealing conformational differences from other 7-mer insertion capsid variants. In PHP.eB, the 7-mer loop adopts a bent conformation, mediated by an interaction between engineered lysine and aspartate residues. Further, we identify PKD2 as the main AAV receptor (AAVR) domain recognizing both AAV9 and PHP.eB and find that the PHP.eB 7-mer partially destabilizes this interaction. Analysis of previously reported AAV structures together with our pull-down data demonstrate that the 7-mer topology determined by the lysine-aspartate interaction dictates AAVR binding strength. Our results suggest that PHP.eB's altered tropism may arise from both an additional interaction with LY6A and weakening of its AAVR interaction. Changing the insertion length, but not sequence, modifies PKD2 binding affinity, suggesting that a steric clash impedes AAVR binding. This research suggests improved library designs for future AAV selections to identify non-LY6A-dependent vectors and modulate AAVR interaction strength. |
リンク | Mol Ther Methods Clin Dev / PubMed:36034770 / PubMed Central |
手法 | EM (単粒子) |
解像度 | 2.24 - 2.9 Å |
構造データ | EMDB-26417: Cryo-EM structure of AAV-PHP.eB, C1 Symmetry EMDB-26453: Cryo-EM structure of AAV-PHP.eB, I1 symmetry applied |
由来 |
|
キーワード | VIRUS / Gene therapy / AAV / capsid / blood-brain barrier / directed evolution |