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-Structure paper
| タイトル | Structural basis of signal peptide recognition by the signal peptidase complex. |
|---|---|
| ジャーナル・号・ページ | Nat Commun, Vol. 17, Issue 1, Year 2026 |
| 掲載日 | 2026年5月22日 |
著者 | A Manuel Liaci / Dimitrios Vismpas / Lisbeth R Kjølbye / Ioannis Skalidis / Gilberto P Pereira / Adrian Fujiet Koh / Mariska Gröllers-Mulderij / Abhay Kotecha / Paulo C T Souza / Friedrich Förster / ![]() |
| PubMed 要旨 | The signal peptidase complex (SPC) is responsible for cleaving signal peptides (SPs) from approximately 10% of the human proteome. SPs are characterized by a tripartite structure, consisting of an N- ...The signal peptidase complex (SPC) is responsible for cleaving signal peptides (SPs) from approximately 10% of the human proteome. SPs are characterized by a tripartite structure, consisting of an N-terminal n-region, a central helical h-region and a C-terminal c-region, each defined by rather general chemical properties rather than strict sequence conservation. Despite their sequence diversity, SPC recognizes and processes SPs with exquisite specificity. Here, we present a 2.6 Å cryo-EM map of the human SPC-A, one of two SPC paralogs, bound to a model SP. The c-region binds to a hydrophobic binding groove near the active site, a narrow gate marks the transition from c- to h-region, and the h-region localizes in a transmembrane (TM) window. Substrate engagement stabilizes N- and C-terminal helices of Sec11A, which frame the SP and are unresolved in the apo structure. Molecular dynamics (MD) simulations confirm a stable hydrogen-bonding network at the c-region and indicate dynamic interactions within a thinned lipid environment at the TM window. AlphaFold modeling supports this binding mode across physiological SPs. Collectively, our structural and computational analyses explain how the SPC achieves its specificity by combining the selectivity of the luminal binding groove and of the transmembrane window. |
リンク | Nat Commun / PubMed:42173868 / PubMed Central |
| 手法 | EM (単粒子) |
| 解像度 | 2.6 - 4.2 Å |
| 構造データ | EMDB-54010, PDB-9rjb: EMDB-54011, PDB-9rjc: |
| 由来 |
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キーワード | MEMBRANE PROTEIN / Signal Peptidase Complex / Signal Peptide / protein biogenesis / secretory pathway / membrane thinning |
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homo sapiens (ヒト)
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