ジャーナル: Cell / 年: 2016 タイトル: Breaking Cryo-EM Resolution Barriers to Facilitate Drug Discovery. 著者: Alan Merk / Alberto Bartesaghi / Soojay Banerjee / Veronica Falconieri / Prashant Rao / Mindy I Davis / Rajan Pragani / Matthew B Boxer / Lesley A Earl / Jacqueline L S Milne / Sriram Subramaniam / 要旨: Recent advances in single-particle cryoelecton microscopy (cryo-EM) are enabling generation of numerous near-atomic resolution structures for well-ordered protein complexes with sizes ≥ ∼200 kDa. ...Recent advances in single-particle cryoelecton microscopy (cryo-EM) are enabling generation of numerous near-atomic resolution structures for well-ordered protein complexes with sizes ≥ ∼200 kDa. Whether cryo-EM methods are equally useful for high-resolution structural analysis of smaller, dynamic protein complexes such as those involved in cellular metabolism remains an important question. Here, we present 3.8 Å resolution cryo-EM structures of the cancer target isocitrate dehydrogenase (93 kDa) and identify the nature of conformational changes induced by binding of the allosteric small-molecule inhibitor ML309. We also report 2.8-Å- and 1.8-Å-resolution structures of lactate dehydrogenase (145 kDa) and glutamate dehydrogenase (334 kDa), respectively. With these results, two perceived barriers in single-particle cryo-EM are overcome: (1) crossing 2 Å resolution and (2) obtaining structures of proteins with sizes < 100 kDa, demonstrating that cryo-EM can be used to investigate a broad spectrum of drug-target interactions and dynamic conformational states.
想定した対称性 - 点群: D3 (2回x3回 2面回転対称) 解像度のタイプ: BY AUTHOR / 解像度: 1.8 Å / 解像度の算出法: FSC 0.143 CUT-OFF / ソフトウェア - 名称: FREALIGN (ver. 9.10) 詳細: The primary map in this entry corresponds to theuncorrected reconstruction. A version sharpened using a B-factor of -90 is provided as additional volume data. 使用した粒子像数: 21818