- EMDB-39061: Cryo-EM map of GlpF in DDM micelle -
+
データを開く
IDまたはキーワード:
読み込み中...
-
基本情報
登録情報
データベース: EMDB / ID: EMD-39061
タイトル
Cryo-EM map of GlpF in DDM micelle
マップデータ
試料
複合体: Tetramer of GlpF in DDM micelle
タンパク質・ペプチド: Glycerol uptake facilitator protein
キーワード
water channel / aquaporin / aquaglyceroporin / glycerol / MEMBRANE PROTEIN
機能・相同性
機能・相同性情報
glycerol transmembrane transporter activity / glycerol channel activity / glycerol transmembrane transport / cellular response to mercury ion / plasma membrane 類似検索 - 分子機能
: / Major intrinsic protein, conserved site / MIP family signature. / Major intrinsic protein / Major intrinsic protein / Aquaporin-like 類似検索 - ドメイン・相同性
Japan Agency for Medical Research and Development (AMED)
JP21ae0121028
日本
引用
ジャーナル: Nat Commun / 年: 2025 タイトル: Narrowed pore conformations of aquaglyceroporins AQP3 and GlpF. 著者: Daisuke Kozai / Masao Inoue / Shota Suzuki / Akiko Kamegawa / Kouki Nishikawa / Hiroshi Suzuki / Toru Ekimoto / Mitsunori Ikeguchi / Yoshinori Fujiyoshi / 要旨: Aquaglyceroporins such as aquaporin-3 (AQP3) and its bacterial homologue GlpF facilitate water and glycerol permeation across lipid bilayers. X-ray crystal structures of GlpF showed open pore ...Aquaglyceroporins such as aquaporin-3 (AQP3) and its bacterial homologue GlpF facilitate water and glycerol permeation across lipid bilayers. X-ray crystal structures of GlpF showed open pore conformations, and AQP3 has also been predicted to adopt this conformation. Here we present cryo-electron microscopy structures of rat AQP3 and GlpF in different narrowed pore conformations. In n-dodecyl-β-D-maltopyranoside detergent micelles, aromatic/arginine constriction filter residues of AQP3 containing Tyr212 form a 2.8-Å diameter pore, whereas in 1-palmitoyl-2-oleoyl-sn-glycero-3-phosphocholine (POPC) nanodiscs, Tyr212 inserts into the pore. Molecular dynamics simulation shows the Tyr212-in conformation is stable and largely suppresses water permeability. AQP3 reconstituted in POPC liposomes exhibits water and glycerol permeability, suggesting that the Tyr212-in conformation may be altered during permeation. AQP3 Y212F and Y212T mutant structures suggest that the aromatic residue drives the pore-inserted conformation. The aromatic residue is conserved in AQP7 and GlpF, but neither structure exhibits the AQP3-like conformation in POPC nanodiscs. Unexpectedly, the GlpF pore is covered by an intracellular loop, but the loop is flexible and not primarily related to the GlpF permeability. Our findings illuminate the unique AQP3 conformation and structural diversity of aquaglyceroporins.