- PDB-7jr7: Cryo-EM structure of ABCG5/G8 in complex with Fab 2E10 and 11F4 -
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基本情報
登録情報
データベース: PDB / ID: 7jr7
タイトル
Cryo-EM structure of ABCG5/G8 in complex with Fab 2E10 and 11F4
要素
(ATP-binding cassette sub-family G member ...) x 2
Fab 11F4 heavy chain
Fab 11F4 light chain
Fab 2E10 heavy chain
Fab 2E10 light chain
キーワード
TRANSLOCASE/IMMUNE SYSTEM / ABC transporter / Sterol / ATP hydrolysis / Pump / Fab / complex / Cholesterol / membrane protein / TRANSLOCASE-IMMUNE SYSTEM complex
機能・相同性
機能・相同性情報
negative regulation of intestinal phytosterol absorption / negative regulation of intestinal cholesterol absorption / Defective ABCG8 causes GBD4 and sitosterolemia / Defective ABCG5 causes sitosterolemia / ABC transporters in lipid homeostasis / sterol transport / intestinal cholesterol absorption / phospholipid transport / cholesterol transfer activity / トランスロカーゼ; 他の化合物の輸送を触媒; ヌクレオシド三リン酸の加水分解に伴う ...negative regulation of intestinal phytosterol absorption / negative regulation of intestinal cholesterol absorption / Defective ABCG8 causes GBD4 and sitosterolemia / Defective ABCG5 causes sitosterolemia / ABC transporters in lipid homeostasis / sterol transport / intestinal cholesterol absorption / phospholipid transport / cholesterol transfer activity / トランスロカーゼ; 他の化合物の輸送を触媒; ヌクレオシド三リン酸の加水分解に伴う / cholesterol efflux / triglyceride homeostasis / response to ionizing radiation / response to muscle activity / ATPase-coupled transmembrane transporter activity / ABC-type transporter activity / NR1H3 & NR1H2 regulate gene expression linked to cholesterol transport and efflux / response to nutrient / ATP-binding cassette (ABC) transporter complex / cholesterol homeostasis / transmembrane transport / receptor complex / apical plasma membrane / response to xenobiotic stimulus / protein heterodimerization activity / ATP hydrolysis activity / ATP binding / metal ion binding / plasma membrane 類似検索 - 分子機能
ABC transporter family G domain / ABC-2 type transporter / : / ABC-2 type transporter / ABC-2 type transporter / ABC transporter-like, conserved site / ABC transporters family signature. / ABC transporter / ABC transporter-like, ATP-binding domain / ATP-binding cassette, ABC transporter-type domain profile. ...ABC transporter family G domain / ABC-2 type transporter / : / ABC-2 type transporter / ABC-2 type transporter / ABC transporter-like, conserved site / ABC transporters family signature. / ABC transporter / ABC transporter-like, ATP-binding domain / ATP-binding cassette, ABC transporter-type domain profile. / P-loop containing nucleotide triphosphate hydrolases / ATPases associated with a variety of cellular activities / AAA+ ATPase domain / Immunoglobulins / Immunoglobulin-like / Sandwich / Rossmann fold / P-loop containing nucleoside triphosphate hydrolase / 3-Layer(aba) Sandwich / Mainly Beta / Alpha Beta 類似検索 - ドメイン・相同性
ATP-binding cassette sub-family G member 8 / ATP-binding cassette sub-family G member 5 類似検索 - 構成要素
ジャーナル: Commun Biol / 年: 2021 タイトル: Cryo-EM structure of ABCG5/G8 in complex with modulating antibodies. 著者: Hanzhi Zhang / Ching-Shin Huang / Xinchao Yu / Jonas Lee / Amit Vaish / Qing Chen / Mingyue Zhou / Zhulun Wang / Xiaoshan Min / 要旨: The heterodimer of ATP-binding cassette transporter ABCG5 and ABCG8 mediates the excretion of sterols from liver and intestine, playing a critical role in cholesterol homeostasis. Here, we present ...The heterodimer of ATP-binding cassette transporter ABCG5 and ABCG8 mediates the excretion of sterols from liver and intestine, playing a critical role in cholesterol homeostasis. Here, we present the cryo-EM structure of ABCG5/G8 in complex with the Fab fragments from two monoclonal antibodies at 3.3Å resolution. The high-resolution structure reveals a unique dimer interface between the nucleotide-binding domains (NBD) of opposing transporters, consisting of an ordered network of salt bridges between the conserved NPXDFXXD motif and serving as a pivot point that may be important for the transport cycle. While mAb 11F4 increases the ATPase activity potentially by stabilization of the NBD dimer formation, mAb 2E10 inhibits ATP hydrolysis, likely by restricting the relative movement between the RecA and helical domain of ABCG8 NBD. Our study not only provides insights into the structural elements important for the transport cycle but also reveals novel epitopes for potential therapeutic interventions.
A: ATP-binding cassette sub-family G member 5 B: ATP-binding cassette sub-family G member 8 C: Fab 11F4 heavy chain D: Fab 11F4 light chain E: Fab 2E10 heavy chain F: Fab 2E10 light chain