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The P-type pumps are a large family of integral membrane transporter ATPases. They are divided into five major types based on substrate specificity, from I to V.
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ATP synthase or ATPase is among the most conserved proteins found in bacteria, mammals, and plants. This enzyme can catalyze a forward reaction in response to the electrochemical gradient, producing ATP from ADP and inorganic phosphate. ATP synthase can also work in a reverse direction by hydrolyzing ATP and generating an electrochemical gradient. Different forms of ATP synthases have evolved special features to meet the specific demands of the cell. Based on their specific feature, ATP...
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Light-driven Molecular Motors on Surfaces for Single Molecular Imaging
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A nanomechanical device based on light-driven proton pumps.

Quan Ren1, Ya-Pu Zhao, Li Han

  • 1State Key Laboratory of Nonlinear Mechanics (LNM), Institute of Mechanics, Chinese Academy of Sciences, Beijing 100080, People's Republic of China.

Nanotechnology
|November 13, 2015
PubMed
Summary
This summary is machine-generated.

This study demonstrates a novel hybrid device where bacteriorhodopsin (bR) on a microcantilever bends with light activation. This bio-hybrid system converts light energy into mechanical motion via proton gradients.

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Area of Science:

  • Bio-nanotechnology
  • Molecular engineering
  • Biophysics

Background:

  • Bacteriorhodopsin (bR) is a light-driven proton pump protein.
  • Microcantilevers are sensitive nanomechanical devices.
  • Converting light energy to mechanical energy is a key challenge in nanotechnology.

Purpose of the Study:

  • To construct a hybrid device integrating bacteriorhodopsin with a microcantilever.
  • To investigate light-induced nanomechanical motion in this bio-hybrid system.
  • To understand the mechanism of light-to-mechanical energy conversion.

Main Methods:

  • Self-assembly of oriented bacteriorhodopsin (bR) film onto a microcantilever.
  • Activation of bR using visible light.
  • Control experiments to rule out thermal and photothermal effects.
  • Monitoring microcantilever bending for nanomechanical motion.

Main Results:

  • The bR-interfaced microcantilever exhibited controllable and reversible bending upon light activation.
  • Nanomechanical motion was induced by proton gradients generated by bR.
  • Heat and photothermal effects were excluded as primary causes of motion.

Conclusions:

  • The hybrid device successfully converts light energy into mechanical energy.
  • The microcantilever interfaced with bR mimics natural solar energy conversion machinery.
  • This system offers a platform for bio-hybrid nanomechanical devices.