Abstract
Protein Translocation About a third of proteins are transported into endoplasmic reticulum by the universally conserved Sec61 protein-conducting channel. Itskanov and Park determined a cryo–electron microscopy structure of the Sec complex from yeast, which mediates posttranslational translocation of many secretory proteins across the endoplasmic reticulum membrane. The study reveals how Sec63 activates the Sec61 channel for substrate polypeptide insertion. The structure also explains the mutually exclusive binding of Sec63 and the ribosome to the channel. Science , this issue p. [84][1] [1]: /lookup/doi/10.1126/science.aav6740
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