ジャーナル: Proc Natl Acad Sci U S A / 年: 2016 タイトル: Cryo-EM reveals the steric zipper structure of a light chain-derived amyloid fibril. 著者: Andreas Schmidt / Karthikeyan Annamalai / Matthias Schmidt / Nikolaus Grigorieff / Marcus Fändrich / 要旨: Amyloid fibrils are proteinaceous aggregates associated with diseases in humans and animals. The fibrils are defined by intermolecular interactions between the fibril-forming polypeptide chains, but ...Amyloid fibrils are proteinaceous aggregates associated with diseases in humans and animals. The fibrils are defined by intermolecular interactions between the fibril-forming polypeptide chains, but it has so far remained difficult to reveal the assembly of the peptide subunits in a full-scale fibril. Using electron cryomicroscopy (cryo-EM), we present a reconstruction of a fibril formed from the pathogenic core of an amyloidogenic immunoglobulin (Ig) light chain. The fibril density shows a lattice-like assembly of face-to-face packed peptide dimers that corresponds to the structure of steric zippers in peptide crystals. Interpretation of the density map with a molecular model enabled us to identify the intermolecular interactions between the peptides and rationalize the hierarchical structure of the fibril based on simple chemical principles.
A: 147.7 Å / B: 147.7 Å / C: 337.59998 Å α=β=γ: 90.0 °
CCP4マップ ヘッダ情報:
mode
Image stored as Reals
Å/pix. X/Y/Z
2.11
2.11
2.11
M x/y/z
70
70
160
origin x/y/z
0.000
0.000
0.000
length x/y/z
147.700
147.700
337.600
α/β/γ
90.000
90.000
90.000
MAP C/R/S
1
2
3
start NC/NR/NS
-35
-35
-80
NC/NR/NS
70
70
160
D min/max/mean
-1968.879
8991.771
1234.688
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添付データ
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試料の構成要素
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全体 : Amyloidogenic Fragment IGSNVVTWYQQL of Immunoglobulin Light Chain...
全体
名称: Amyloidogenic Fragment IGSNVVTWYQQL of Immunoglobulin Light Chain of Human AL Patient
要素
試料: Amyloidogenic Fragment IGSNVVTWYQQL of Immunoglobulin Light Chain of Human AL Patient
タンパク質・ペプチド: Immunoglobulin Light Chain
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超分子 #1000: Amyloidogenic Fragment IGSNVVTWYQQL of Immunoglobulin Light Chain...
超分子
名称: Amyloidogenic Fragment IGSNVVTWYQQL of Immunoglobulin Light Chain of Human AL Patient タイプ: sample / ID: 1000 / 詳細: The sample forms long amyloid-like fibrils. / Number unique components: 1