ジャーナル: Nanoscale / 年: 2015 タイトル: Progress toward clonable inorganic nanoparticles. 著者: Thomas W Ni / Lucian C Staicu / Richard S Nemeth / Cindi L Schwartz / David Crawford / Jeffrey D Seligman / William J Hunter / Elizabeth A H Pilon-Smits / Christopher J Ackerson / 要旨: Pseudomonas moraviensis stanleyae was recently isolated from the roots of the selenium (Se) hyperaccumulator plant Stanleya pinnata. This bacterium tolerates normally lethal concentrations of SeO3(2-) ...Pseudomonas moraviensis stanleyae was recently isolated from the roots of the selenium (Se) hyperaccumulator plant Stanleya pinnata. This bacterium tolerates normally lethal concentrations of SeO3(2-) in liquid culture, where it also produces Se nanoparticles. Structure and cellular ultrastructure of the Se nanoparticles as determined by cellular electron tomography shows the nanoparticles as intracellular, of narrow dispersity, symmetrically irregular and without any observable membrane or structured protein shell. Protein mass spectrometry of a fractionated soluble cytosolic material with selenite reducing capability identified nitrite reductase and glutathione reductase homologues as NADPH dependent candidate enzymes for the reduction of selenite to zerovalent Se nanoparticles. In vitro experiments with commercially sourced glutathione reductase revealed that the enzyme can reduce SeO3(2-) (selenite) to Se nanoparticles in an NADPH-dependent process. The disappearance of the enzyme as determined by protein assay during nanoparticle formation suggests that glutathione reductase is associated with or possibly entombed in the nanoparticles whose formation it catalyzes. Chemically dissolving the nanoparticles releases the enzyme. The size of the nanoparticles varies with SeO3(2-) concentration, varying in size form 5 nm diameter when formed at 1.0 μM [SeO3(2-)] to 50 nm maximum diameter when formed at 100 μM [SeO3(2-)]. In aggregate, we suggest that glutathione reductase possesses the key attributes of a clonable nanoparticle system: ion reduction, nanoparticle retention and size control of the nanoparticle at the enzyme site.
ダウンロード / ファイル: emd_2939.map.gz / 形式: CCP4 / 大きさ: 270.4 MB / タイプ: IMAGE STORED AS SIGNED BYTE
注釈
Reconstruction of Pseudomonas moraviensis stanleyae containing selenium nanoparticles
ボクセルのサイズ
X=Y=Z: 91 Å
密度
最小 - 最大
-128.0 - 127.0
平均 (標準偏差)
9.528561590000001 (±31.384305950000002)
対称性
空間群: 1
詳細
EMDB XML:
マップ形状
Axis order
X
Y
Z
Origin
-44
-21
14
サイズ
1200
1228
197
Spacing
1200
1228
197
セル
A: 111748.0 Å / B: 109200.0 Å / C: 17927.0 Å α=β=γ: 90.0 °
CCP4マップ ヘッダ情報:
mode
envelope stored as signed bytes (from -128 lowest to 127 highest)
Å/pix. X/Y/Z
91
91
91
M x/y/z
1228
1200
197
origin x/y/z
0.000
0.000
0.000
length x/y/z
111748.000
109200.000
17927.000
α/β/γ
90.000
90.000
90.000
MAP C/R/S
1
2
3
start NC/NR/NS
-21
-44
14
NC/NR/NS
1228
1200
197
D min/max/mean
-128.000
127.000
9.529
-
添付データ
-
試料の構成要素
-
全体 : Selenium Nanoparticles contained within cells of Pseudomonas mora...
全体
名称: Selenium Nanoparticles contained within cells of Pseudomonas moraviensis stanleyae
要素
試料: Selenium Nanoparticles contained within cells of Pseudomonas moraviensis stanleyae
Em label: Pseudomonas moraviensis stanleyae
-
超分子 #1000: Selenium Nanoparticles contained within cells of Pseudomonas mora...
超分子
名称: Selenium Nanoparticles contained within cells of Pseudomonas moraviensis stanleyae タイプ: sample / ID: 1000 詳細: Cells were grown in 10 mM HNaSeO3/LB for 36 hours. Medium was replaced every 8 hours. Number unique components: 1
-
分子 #1: Pseudomonas moraviensis stanleyae
分子
名称: Pseudomonas moraviensis stanleyae / タイプ: em_label / ID: 1 詳細: ~80 nm selenium nanoparticles were made inside of Pseudomonas moraviensis stanleyae cells. Showing a potential clonable tag capable of making inorganic nanoparticles.