Validation of cryo-EM structure of IP₃R1 channel.
Validation of cryo-EM structure of IP₃R1 channel.
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DOI:
10.1016/j.str.2013.04.016
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发表时间:
2013-06-04
期刊:
影响因子:
5.7
通讯作者:
Serysheva, Irina I.
中科院分区:
文献类型:
--
作者:
Murray, Stephen C.;Flanagan, John;Popova, Olga B.;Chiu, Wah;Ludtke, Steven J.;Serysheva, Irina I.
About a decade ago, three electron cryomicroscopy (cryo-EM) single particle reconstructions of IP3R1 were reported at low resolution. Disturbingly, these structures bore little similarity to one another, even at the level of quaternary structure. Recently, we published an improved structure of IP3R1 at ~1 nm resolution. However, this structure did not bear any resemblance to any of the three previously published structures, leading to the question of why the new structure should be considered more reliable than the original three. Here we apply several methods, including class-average/map comparisons, tilt-pair validation, and use of multiple refinement software packages, to give strong evidence for the reliability of our recent structure. The map resolution and feature resolvability are assessed with the ‘gold standard’ criterion. This approach is generally applicable to assessing the validity of cryo-EM maps of other molecular machines.
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