- EMDB-42793: Aquaporin Z with ALFA tag and bound to nanobody -
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基本情報
登録情報
データベース: EMDB / ID: EMD-42793
タイトル
Aquaporin Z with ALFA tag and bound to nanobody
マップデータ
EM map
試料
複合体: Aquaporin Z with ALFA tag bound to nanobody
複合体: Aquaporin Z with ALFA tag
タンパク質・ペプチド: Aquaporin Z
複合体: nanobody
タンパク質・ペプチド: anti-ALFA nanobody
リガンド: CARDIOLIPIN
キーワード
AqpZ / water channel / ALFA tag / cardiolipin / MEMBRANE PROTEIN
機能・相同性
機能・相同性情報
intracellular water homeostasis / water transport / water channel activity / response to osmotic stress / identical protein binding / plasma membrane 類似検索 - 分子機能
Aquaporin Z / Aquaporin transporter / 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
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)
R01GM138863
米国
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)
R01GM139876
米国
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)
RM1GM145416
米国
引用
ジャーナル: J Struct Biol X / 年: 2024 タイトル: Grafting the ALFA tag for structural studies of aquaporin Z. 著者: Lauren Stover / Hanieh Bahramimoghaddam / Lie Wang / Samantha Schrecke / Gaya P Yadav / Ming Zhou / Arthur Laganowsky / 要旨: Aquaporin Z (AqpZ), a bacterial water channel, forms a tetrameric complex and, like many other membrane proteins, activity is regulated by lipids. Various methods have been developed to facilitate ...Aquaporin Z (AqpZ), a bacterial water channel, forms a tetrameric complex and, like many other membrane proteins, activity is regulated by lipids. Various methods have been developed to facilitate structure determination of membrane proteins, such as the use of antibodies. Here, we graft onto AqpZ the ALFA tag (AqpZ-ALFA), an alpha helical epitope, to make use of the high-affinity anti-ALFA nanobody (nB). Native mass spectrometry reveals the AqpZ-ALFA fusion forms a stable, 1:1 complex with nB. Single-particle cryogenic electron microscopy studies reveal the octameric (AqpZ-ALFA)(nB) complex forms a dimeric assembly and the structure was determined to 1.9 Å resolution. Dimerization of the octamer is mediated through stacking of the symmetrically bound nBs. Tube-like density is also observed, revealing a potential cardiolipin binding site. Grafting of the ALFA tag, or other epitope, along with binding and association of nBs to promote larger complexes will have applications in structural studies and protein engineering.