National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)
R00GM141261
米国
引用
ジャーナル: Nat Commun / 年: 2024 タイトル: SPRING licenses S1P-mediated cleavage of SREBP2 by displacing an inhibitory pro-domain. 著者: Sebastian Hendrix / Vincent Dartigue / Hailee Hall / Shrankhla Bawaria / Jenina Kingma / Bilkish Bajaj / Noam Zelcer / Daniel L Kober / 要旨: Site-one protease (S1P) conducts the first of two cleavage events in the Golgi to activate Sterol regulatory element binding proteins (SREBPs) and upregulate lipogenic transcription. S1P is also ...Site-one protease (S1P) conducts the first of two cleavage events in the Golgi to activate Sterol regulatory element binding proteins (SREBPs) and upregulate lipogenic transcription. S1P is also required for a wide array of additional signaling pathways. A zymogen serine protease, S1P matures through autoproteolysis of two pro-domains, with one cleavage event in the endoplasmic reticulum (ER) and the other in the Golgi. We recently identified the SREBP regulating gene, (SPRING), which enhances S1P maturation and is necessary for SREBP signaling. Here, we report the cryo-EM structures of S1P and S1P-SPRING at sub-2.5 Å resolution. SPRING activates S1P by dislodging its inhibitory pro-domain and stabilizing intra-domain contacts. Functionally, SPRING licenses S1P to cleave its cognate substrate, SREBP2. Our findings reveal an activation mechanism for S1P and provide insights into how spatial control of S1P activity underpins cholesterol homeostasis.
超分子 #1: Complex of matured site-1 protease bound to SPRING
超分子
名称: Complex of matured site-1 protease bound to SPRING / タイプ: complex / ID: 1 / 親要素: 0 / 含まれる分子: #1-#2 詳細: Co-expressed and secreted ectodomains of SPRING-His10 and S1P-FLAG purified using NiNTA chromatography and gel filtration.