ジャーナル: Nature / 年: 2013 タイトル: Reconfiguration of the proteasome during chaperone-mediated assembly. 著者: Soyeon Park / Xueming Li / Ho Min Kim / Chingakham Ranjit Singh / Geng Tian / Martin A Hoyt / Scott Lovell / Kevin P Battaile / Michal Zolkiewski / Philip Coffino / Jeroen Roelofs / Yifan Cheng / Daniel Finley / 要旨: The proteasomal ATPase ring, comprising Rpt1-Rpt6, associates with the heptameric α-ring of the proteasome core particle (CP) in the mature proteasome, with the Rpt carboxy-terminal tails inserting ...The proteasomal ATPase ring, comprising Rpt1-Rpt6, associates with the heptameric α-ring of the proteasome core particle (CP) in the mature proteasome, with the Rpt carboxy-terminal tails inserting into pockets of the α-ring. Rpt ring assembly is mediated by four chaperones, each binding a distinct Rpt subunit. Here we report that the base subassembly of the Saccharomyces cerevisiae proteasome, which includes the Rpt ring, forms a high-affinity complex with the CP. This complex is subject to active dissociation by the chaperones Hsm3, Nas6 and Rpn14. Chaperone-mediated dissociation was abrogated by a non-hydrolysable ATP analogue, indicating that chaperone action is coupled to nucleotide hydrolysis by the Rpt ring. Unexpectedly, synthetic Rpt tail peptides bound α-pockets with poor specificity, except for Rpt6, which uniquely bound the α2/α3-pocket. Although the Rpt6 tail is not visualized within an α-pocket in mature proteasomes, it inserts into the α2/α3-pocket in the base-CP complex and is important for complex formation. Thus, the Rpt-CP interface is reconfigured when the lid complex joins the nascent proteasome to form the mature holoenzyme.
ダウンロード / ファイル: emd_5617.map.gz / 形式: CCP4 / 大きさ: 81.8 MB / タイプ: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
注釈
3D density map of yeast 20S proteasome core particle with GST tag in complex with purified yeast 19S base subcomplex
ボクセルのサイズ
X=Y=Z: 1.47 Å
密度
表面レベル
登録者による: 0.45 / ムービー #1: 0.45
最小 - 最大
-0.65987134 - 1.42507792
平均 (標準偏差)
-0.00337961 (±0.09523063)
対称性
空間群: 1
詳細
EMDB XML:
マップ形状
Axis order
X
Y
Z
Origin
0
0
0
サイズ
280
280
280
Spacing
280
280
280
セル
A=B=C: 411.6 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
1.47
1.47
1.47
M x/y/z
280
280
280
origin x/y/z
0.000
0.000
0.000
length x/y/z
411.600
411.600
411.600
α/β/γ
90.000
90.000
90.000
start NX/NY/NZ
-132
-122
-147
NX/NY/NZ
250
274
261
MAP C/R/S
1
2
3
start NC/NR/NS
0
0
0
NC/NR/NS
280
280
280
D min/max/mean
-0.660
1.425
-0.003
-
添付データ
-
試料の構成要素
-
全体 : Reconstituted complex of Yeast 20S + 19S base sub complex
全体
名称: Reconstituted complex of Yeast 20S + 19S base sub complex
要素
試料: Reconstituted complex of Yeast 20S + 19S base sub complex
タンパク質・ペプチド: proteasome
-
超分子 #1000: Reconstituted complex of Yeast 20S + 19S base sub complex
超分子
名称: Reconstituted complex of Yeast 20S + 19S base sub complex タイプ: sample / ID: 1000 集合状態: one 19S base subcomplex binds to a 20S core particle Number unique components: 2
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分子 #1: proteasome
分子
名称: proteasome / タイプ: protein_or_peptide / ID: 1 詳細: reconstituted complex of yeast 20S core particle with purified 19S base sub complex 組換発現: No / データベース: NCBI