The invention discloses a method for determining
RNA heterogeneity in a three-dimensional structure of
RNA, which comprises the following steps: S3, purifying folded
RNA, freezing, preparing a sample, vitrifying, and evaluating under a freezing
electron microscope to obtain a carrier net with optimal
ice thickness and uniform particle size and distribution; s4, the grid carries out small-amount data collection,
data processing is paused after two-dimensional (2D) classification is completed so as to carry out preliminary evaluation, if the preliminary evaluation has obvious RNA characteristics, large-scale cryoelectron
microscope data collection and subsequent
data processing are carried out so as to solve RNA heterogeneity, and if the preliminary evaluation does not have obvious RNA characteristics, large-scale cryoelectron
microscope data collection and subsequent
data processing are carried out so as to solve RNA heterogeneity; if not, trying different RNA preparation and / or
vitrification conditions to obtain an optimized RNA sample, carrying out small-amount data collection again until obvious RNA characteristics exist, carrying out large-scale cryoelectron microscope data collection, and then carrying out data
processing to solve RNA heterogeneity; and S5, most RNA experiences conformational changes when executing functions, and the conformational changes are separated more effectively by combining a standard cryoelectron microscope data
processing flow and a three-dimensional classification
algorithm. The present invention assists in implementing cryo-EM structure assays, assisted by a cryo-EM data
processing flow, to parse RNA dynamics and conformational variations, and an RNA modeling
algorithm to generate
atomic coordinates based on a medium to
high resolution cryo-EM density map.