ジャーナル: Structure / 年: 2011 タイトル: The architecture of CopA from Archeaoglobus fulgidus studied by cryo-electron microscopy and computational docking. 著者: Gregory S Allen / Chen-Chou Wu / Tim Cardozo / David L Stokes / 要旨: CopA uses ATP to pump Cu(+) across cell membranes. X-ray crystallography has defined atomic structures of several related P-type ATPases. We have determined a structure of CopA at 10 Å resolution ...CopA uses ATP to pump Cu(+) across cell membranes. X-ray crystallography has defined atomic structures of several related P-type ATPases. We have determined a structure of CopA at 10 Å resolution by cryo-electron microscopy of a new crystal form and used computational molecular docking to study the interactions between the N-terminal metal-binding domain (NMBD) and other elements of the molecule. We found that the shorter-chain lipids used to produce these crystals are associated with movements of the cytoplasmic domains, with a novel dimer interface and with disordering of the NMBD, thus offering evidence for the transience of its interaction with the other cytoplasmic domains. Docking identified a binding site that matched the location of the NMBD in our previous structure by cryo-electron microscopy, allowing a more detailed view of its binding configuration and further support for its role in autoinhibition.
名称: deltaC-CopA in DMPC-DOPE lipids / タイプ: COMPLEX 詳細: DeltaC-CopA tubular crystals were grown with a 4-to-1 mixture of DMPC-DOPE at a protein concentration of 1 mg/mL and at a lipid-to-protein weight ratio of 0.4. Dialysis was carried out for 5 ...詳細: DeltaC-CopA tubular crystals were grown with a 4-to-1 mixture of DMPC-DOPE at a protein concentration of 1 mg/mL and at a lipid-to-protein weight ratio of 0.4. Dialysis was carried out for 5 days in 50 uL dialysis buttons at 303K against 500 mL of 50 mM MES, pH 6.1, 25 mM Na2SO4, 25 mM K2SO4, 200 uM BCDS, 10 mM MgSO4, and 2 mM beta-mercaptoethanol. Stock solutions of lipid were made in dodecyl octaethylene glycol ether (C12E8) at 1 mg lipid per 2 mg detergent.
分子量
値: 0.077 MDa / 実験値: NO
緩衝液
pH: 6.1 詳細: 50 mM MES, pH 6.1, 25 mM Na2SO4, 25 mM K2SO4, 200 uM BCDS, 10 mM MgSO4, 2 mM beta-mercaptoethanol
試料
濃度: 1 mg/ml / 包埋: NO / シャドウイング: NO / 染色: NO / 凍結: YES 詳細: 50 mM MES, pH 6.1, 25 mM Na2SO4, 25 mM K2SO4, 200 uM BCDS, 10 mM MgSO4, 2 mM beta-mercaptoethanol
急速凍結
装置: HOMEMADE PLUNGER / 凍結剤: ETHANE / Temp: 77 K / 手法: blot for 5 seconds before plunging