- PDB-8ucq: CryoEM structure of Sec7 autoinhibited conformation -
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基本情報
登録情報
データベース: PDB / ID: 8ucq
タイトル
CryoEM structure of Sec7 autoinhibited conformation
要素
SEC7 domain-containing protein
キーワード
PROTEIN TRANSPORT / GEF / Exchange Factor / Golgi
機能・相同性
機能・相同性情報
regulation of ARF protein signal transduction / guanyl-nucleotide exchange factor activity / protein transport / Golgi apparatus / membrane 類似検索 - 分子機能
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)
R35GM136258
米国
引用
ジャーナル: Proc Natl Acad Sci U S A / 年: 2024 タイトル: Sec7 regulatory domains scaffold autoinhibited and active conformations. 著者: Bryce A Brownfield / Brian C Richardson / Steve L Halaby / J Christopher Fromme / 要旨: The late stages of Golgi maturation involve a series of sequential trafficking events in which cargo-laden vesicles are produced and targeted to multiple distinct subcellular destinations. Each of ...The late stages of Golgi maturation involve a series of sequential trafficking events in which cargo-laden vesicles are produced and targeted to multiple distinct subcellular destinations. Each of these vesicle biogenesis events requires activation of an Arf GTPase by the Sec7/BIG guanine nucleotide exchange factor (GEF). Sec7 localization and activity is regulated by autoinhibition, positive feedback, and interaction with other GTPases. Although these mechanisms have been characterized biochemically, we lack a clear picture of how GEF localization and activity is modulated by these signals. Here, we report the cryogenic electron microscopy structure of full-length Sec7 in its autoinhibited form, revealing the architecture of its multiple regulatory domains. We use functional experiments to determine the basis for autoinhibition and use structural predictions to produce a model for an active conformation of the GEF that is supported empirically. This study therefore elucidates the conformational transition that Sec7 undergoes to become active on the organelle membrane surface.