{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nSEC61A1 encodes the pore‐forming α subunit of the heterotrimeric Sec61 complex—a central component of the endoplasmic reticulum (ER) protein translocation machinery. This complex creates a dynamic aqueous channel through which nascent polypeptides, bearing signal peptides or transmembrane domains, are co‐ or post‐translationally inserted into or across the ER membrane. In addition, the Sec61 complex has been shown to allow passive leakage of Ca²⁺ from the ER into the cytosol, a process intricately balanced by chaperones and other regulatory factors to maintain calcium homeostasis."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "1", "end_ref": "8"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nSEC61A1 activity is subject to multiple layers of regulation. The binding of lumenal chaperones such as BiP—as well as calcium‐dependent interactions with calmodulin—serves to modulate the open probability of the Sec61 channel, thereby limiting unregulated Ca²⁺ leakage. Inhibitors like mycolactone and substrate‐selective compounds such as cotransin provide powerful tools to probe the mechanism of Sec61‐dependent translocation; these agents block the initiation of protein import into the ER while sparing other pathways (for example, the integration of tail‐anchored proteins). Moreover, Sec61 function directly impacts immune cell activity by affecting antigen presentation and ER‐associated degradation (ERAD) of misfolded proteins."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "9", "end_ref": "16"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nAlterations in SEC61A1—notably missense mutations or copy number variations—have been implicated in a range of human diseases. Mutations affecting SEC61A1 can impair protein import into the ER and disrupt calcium homeostasis, with pathogenic outcomes evident in autosomal‐dominant tubulo‐interstitial kidney disease, various immunodeficiencies (including congenital neutropenia and common variable immunodeficiency) and even polycystic liver disease. Furthermore, genomic aberrations involving SEC61 components have been identified in myelodysplastic syndromes and certain cancers, underscoring the clinical relevance of precise Sec61 function."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "17", "end_ref": "24"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nBeyond its canonical role in protein translocation and Ca²⁺ leakage, SEC61A1 contributes to the fine‐tuning of ER functions through dynamic conformational changes that permit the selective integration of various substrates. Its participation ensures that signal peptides and multiple transmembrane domains are accurately recognized, processed, and laterally inserted into the lipid bilayer—a process that sometimes involves auxiliary factors such as the ER membrane complex (EMC). Moreover, alternative pathways exist for the post‐translational delivery of short secretory proteins, and Sec61-dependent channels have even been implicated in the nuclear import of endocytosed bacterial toxins. Such insights, together with observations linking Sec61 to the modulation of ER stress sensors like IRE1α, refine our understanding of how SEC61A1 orchestrates multiple aspects of cellular protein homeostasis."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "25", "end_ref": "29"}]}, {"type": "t", "text": "\n"}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Colin J Daniel, Brian Conti, Arthur E Johnson, et al. 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