Subunit rotation in single FRET-labeled F1-ATPase hold in solution by an anti-Brownian electrokinetic trap
Subunit rotation in single FRET-labeled F1-ATPase hold in solution by an anti-Brownian electrokinetic trap
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单个 FRET 标记的 F1-ATP 酶中的亚基旋转通过反布朗动电陷阱保持在溶液中
DOI:
10.1117/12.2002955
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发表时间:
2013
期刊:
影响因子:
--
通讯作者:
M. Börsch
中科院分区:
文献类型:
--
作者:
H. Sielaff;T. Heitkamp;A. Zappe;N. Zarrabi;M. Börsch
FoF1-ATP synthase catalyzes the synthesis of adenosine triphosphate (ATP). The F1portion can be stripped from the membrane-embedded Foportion of the enzyme. F1acts as an ATP hydrolyzing enzyme, and ATP hydrolysis is associated with stepwise rotation of the γ and ε subunits of F1. This rotary motion was studied in great detail for the last 15 years using single F1parts attached to surfaces. Subunit rotation of γ was monitored by videomicroscopy of bound fluorescent actin filaments, nanobeads or nanorods, or single fluorophores. Alternatively, we applied single-molecule Förster resonance energy transfer (FRET) to monitor subunit rotation in the holoenzyme FoF1-ATP synthase which was reconstituted in liposomes. Now we aim to extend the observation times of single FRET-labeled F1in solution using a modified version of the anti-Brownian electrokinetic trap (ABELtrap) invented by A. E. Cohen and W. E. Moerner. We used Monte Carlo simulations to reveal that stepwise FRET efficiency changes can be analyzed by Hidden Markov Models even at the limit of a low signal-to-background ratio that was expected due to high background count rates caused by the microfluidics of the ABELtrap.
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DOI:
10.1016/j.bbamem.2009.05.013
发表时间:
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期刊:
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影响因子:
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作者:
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期刊:
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影响因子:
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