ジャーナル: Mol Cell / 年: 2006 タイトル: Type IV pilus structure by cryo-electron microscopy and crystallography: implications for pilus assembly and functions. 著者: Lisa Craig / Niels Volkmann / Andrew S Arvai / Michael E Pique / Mark Yeager / Edward H Egelman / John A Tainer / 要旨: Type IV pili (T4P) are long, thin, flexible filaments on bacteria that undergo assembly-disassembly from inner membrane pilin subunits and exhibit astonishing multifunctionality. Neisseria ...Type IV pili (T4P) are long, thin, flexible filaments on bacteria that undergo assembly-disassembly from inner membrane pilin subunits and exhibit astonishing multifunctionality. Neisseria gonorrhoeae (gonococcal or GC) T4P are prototypic virulence factors and immune targets for increasingly antibiotic-resistant human pathogens, yet detailed structures are unavailable for any T4P. Here, we determined a detailed experimental GC-T4P structure by quantitative fitting of a 2.3 A full-length pilin crystal structure into a 12.5 A resolution native GC-T4P reconstruction solved by cryo-electron microscopy (cryo-EM) and iterative helical real space reconstruction. Spiraling three-helix bundles form the filament core, anchor the globular heads, and provide strength and flexibility. Protruding hypervariable loops and posttranslational modifications in the globular head shield conserved functional residues in pronounced grooves, creating a surprisingly corrugated pilus surface. These results clarify T4P multifunctionality and assembly-disassembly while suggesting unified assembly mechanisms for T4P, archaeal flagella, and type II secretion system filaments.
A: Fimbrial protein B: Fimbrial protein C: Fimbrial protein D: Fimbrial protein E: Fimbrial protein F: Fimbrial protein G: Fimbrial protein H: Fimbrial protein I: Fimbrial protein J: Fimbrial protein K: Fimbrial protein L: Fimbrial protein M: Fimbrial protein N: Fimbrial protein O: Fimbrial protein P: Fimbrial protein Q: Fimbrial protein R: Fimbrial protein ヘテロ分子
ACCORDING TO AUTHORS THE RESIDUES HAVE BEEN CONFIRMED BY SEQUENCING THE PILE GENE THAT ENCODES THE ...ACCORDING TO AUTHORS THE RESIDUES HAVE BEEN CONFIRMED BY SEQUENCING THE PILE GENE THAT ENCODES THE GC PILIN SUBUNIT
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実験情報
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実験
実験
手法: 電子顕微鏡法
EM実験
試料の集合状態: FILAMENT / 3次元再構成法: らせん対称体再構成法
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試料調製
構成要素
名称: N. gonorrhoeae Type IV pili / タイプ: COMPLEX 詳細: native pili were sheared from N. gonorrhoeae cells and purified by successive rounds of precipitation in neutral pH buffer, which causes the filaments to aggregate, followed by resuspension in high pH buffer
緩衝液
名称: 50 mM CHES / pH: 9.5 / 詳細: 50 mM CHES
試料
濃度: 0.1 mg/ml / 包埋: NO / シャドウイング: NO / 染色: NO / 凍結: YES
試料支持
詳細: Quantifoil holey carbon grids, glow discharged with amyl amine
急速凍結
装置: FEI VITROBOT MARK I / 凍結剤: ETHANE 詳細: 5 ul of sample were applied to grids for 1 minute, blotted for 2.5 seconds then plunge-frozen in liquid ethane using an FEI Vitrobot
最高解像度: 12.5 Å 詳細: The GC pilus filament structure was built by computationally fitting a single GC pilin subunit (2HI2.pdb) into a cryoEM density map of the pilus filament (EMDB code xxx) using the program ...詳細: The GC pilus filament structure was built by computationally fitting a single GC pilin subunit (2HI2.pdb) into a cryoEM density map of the pilus filament (EMDB code xxx) using the program CoAn (Volkmann and Hanein, J. Struct. Biol., 125, 176-184, 1999), and then applying the symmetry operators defined by the cryoEM reconstruction (10.5 Angstrom rise and a 100.8 degree azimuthal rotation, Craig et al., Mol. Cell xxx, yyy, 2006) to the subunit.
精密化ステップ
サイクル: LAST / 最高解像度: 12.5 Å
タンパク質
核酸
リガンド
溶媒
全体
原子数
21726
0
648
0
22374
NMR software
名称: CoAn / 分類: 精密化
精密化
ソフトェア番号: 1 詳細: The GC pilus filament structure was built by computationally fitting a single GC pilin subunit (2HI2.pdb) into a cryoEM density map of the pilus filament (EMDB code xxx) using the program ...詳細: The GC pilus filament structure was built by computationally fitting a single GC pilin subunit (2HI2.pdb) into a cryoEM density map of the pilus filament (EMDB code xxx) using the program CoAn (Volkmann and Hanein, J. Struct. Biol., 125, 176-184, 1999), and then applying the symmetry operators defined by the cryoEM reconstruction (10.5 Angstrom rise and a 100.8 degree azimuthal rotation, Craig et al., Mol. Cell xxx, yyy, 2006) to the subunit.