ジャーナル: Biochemistry / 年: 2023 タイトル: Design of Diverse Asymmetric Pockets in Homo-oligomeric Proteins. 著者: Stacey R Gerben / Andrew J Borst / Derrick R Hicks / Isabelle Moczygemba / David Feldman / Brian Coventry / Wei Yang / Asim K Bera / Marcos Miranda / Alex Kang / Hannah Nguyen / David Baker / 要旨: A challenge for design of protein-small-molecule recognition is that incorporation of cavities with size, shape, and composition suitable for specific recognition can considerably destabilize protein ...A challenge for design of protein-small-molecule recognition is that incorporation of cavities with size, shape, and composition suitable for specific recognition can considerably destabilize protein monomers. This challenge can be overcome through binding pockets formed at homo-oligomeric interfaces between folded monomers. Interfaces surrounding the central homo-oligomer symmetry axes necessarily have the same symmetry and so may not be well suited to binding asymmetric molecules. To enable general recognition of arbitrary asymmetric substrates and small molecules, we developed an approach to designing asymmetric interfaces at off-axis sites on homo-oligomers, analogous to those found in native homo-oligomeric proteins such as glutamine synthetase. We symmetrically dock curved helical repeat proteins such that they form pockets at the asymmetric interface of the oligomer with sizes ranging from several angstroms, appropriate for binding a single ion, to up to more than 20 Å across. Of the 133 proteins tested, 84 had soluble expression in , 47 had correct oligomeric states in solution, 35 had small-angle X-ray scattering (SAXS) data largely consistent with design models, and 8 had negative-stain electron microscopy (nsEM) 2D class averages showing the structures coming together as designed. Both an X-ray crystal structure and a cryogenic electron microscopy (cryoEM) structure are close to the computational design models. The nature of these proteins as homo-oligomers allows them to be readily built into higher-order structures such as nanocages, and the asymmetric pockets of these structures open rich possibilities for small-molecule binder design free from the constraints associated with monomer destabilization.
履歴
登録
2022年8月19日
登録サイト: RCSB / 処理サイト: RCSB
改定 1.0
2023年1月25日
Provider: repository / タイプ: Initial release
改定 1.1
2024年6月19日
Group: Data collection / カテゴリ: chem_comp_atom / chem_comp_bond
電子線照射量: 63.56 e/Å2 / フィルム・検出器のモデル: GATAN K3 (6k x 4k)
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解析
ソフトウェア
名称: PHENIX / バージョン: 1.20.1_4487: / 分類: 精密化
EMソフトウェア
ID
名称
バージョン
カテゴリ
9
cryoSPARC
3.2
初期オイラー角割当
10
cryoSPARC
3.2
最終オイラー角割当
CTF補正
タイプ: NONE
粒子像の選択
選択した粒子像数: 2944810
3次元再構成
解像度: 3.85 Å / 解像度の算出法: FSC 0.143 CUT-OFF / 粒子像の数: 855664 詳細: Removed large number over over-represented views from initial set of particles. 対称性のタイプ: POINT