SMART (Shuimu Automated Reconstruction Technology): An Integrated Computational Platform for Streamlining...

Cryo-electron microscopy (cryo-EM) has become a central tool in structural biology, yet current workflows typically require multiple specialized software packages for data acquisition, three-dimensional (3D) reconstruction, and atomic model building, leading to fragmented pipelines and frequent manual intervention. Here, we present SMART (Shuimu Automated Reconstruction Technology), an integrated software platform that combines three modules-DataSmart for automated data collection, CryoSmart for image processing and 3D reconstruction, and ModelSmart for deep-learning-based atomic model building-within a unified browser-accessible interface. This protocol provides step-by-step instructions for operating all three modules. The workflow encompasses automated specimen navigation and data acquisition, motion correction, contrast transfer function (CTF) estimation, particle picking, two-dimensional (2D) classification, 3D refinement, map enhancement, and atomic model generation. As a representative example, we applied the complete workflow to determine the structure of human TRPML1, a Ca²⁺-permeable lysosomal cation channel, achieving a global resolution of 2.38 Å by gold-standard Fourier shell correlation (FSC) at the 0.143 criterion. All three modules (DataSmart, CryoSmart, and ModelSmart) were applied sequentially to the same TRPML1 dataset within this study. The protocol is designed to be accessible to users with varying levels of cryo-EM experience.