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Related Concept Videos

Thermosensation01:43

Thermosensation

Peripheral thermosensation is the perception of external temperature. A change in temperature (on the surface of the skin and other tissues) is detected by a family of temperature-sensitive ion channels called Transient Receptor Potential, or TRP, receptors. These receptors are located on free nerve endings. Those detecting cold temperatures are closer to the surface of the skin than the nerve endings detecting warmth. These thermoTRP channels, while temperature selective, have relatively...
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In multi-pass transmembrane proteins, the polypeptide chain crosses the membrane more than once. The transmembrane polypeptide chain either forms an α-helix or β-strand structure. α-Helix containing multi-pass transmembrane proteins are ubiquitous, whereas β-strand containing ones are mainly found in gram-negative bacteria, mitochondria, and chloroplasts.
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Membrane Fluidity01:23

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Cell membranes are composed of phospholipids, proteins, and carbohydrates loosely attached to one another through chemical interactions. Molecules are generally able to move about in the plane of the membrane, giving the membrane its flexible nature called fluidity. Two other features of the membrane contribute to membrane fluidity: the chemical structure of the phospholipids and the presence of cholesterol in the membrane.Fatty acids tails of phospholipids can be either saturated or...
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Mosaic nature of the membrane
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Related Experiment Video

Updated: Jul 18, 2026

Yeast Luminometric and Xenopus Oocyte Electrophysiological Examinations of the Molecular Mechanosensitivity of TRPV4
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Temperature-responsive protein pores.

Yuni Jung1, Hagan Bayley, Liviu Movileanu

  • 1Department of Medical Biochemistry and Genetics, The Texas A&M University System Health Science Center, College Station, Texas 77843-1114, USA.

Journal of the American Chemical Society
|November 23, 2006
PubMed
Summary

Researchers engineered temperature-responsive protein pores using elastin-like polypeptide (ELP) loops within alpha-hemolysin (alphaHL) pores. These modified pores exhibit reversible, temperature-controlled ion flow, opening and closing based on ELP conformation.

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Area of Science:

  • Biotechnology
  • Nanotechnology
  • Protein Engineering

Background:

  • Alpha-hemolysin (alphaHL) is a heptameric protein pore with a known crystal structure and a large internal cavity.
  • Protein pores are crucial in biological systems and have potential applications in sensing and drug delivery.
  • Controlling pore function dynamically is a key challenge in developing advanced biomaterials.

Purpose of the Study:

  • To engineer temperature-responsive protein pores by incorporating elastin-like polypeptide (ELP) loops.
  • To investigate the effect of ELP loop insertion on the ion transport properties of alphaHL pores.
  • To explore the potential applications of these tunable protein pores in medical biotechnology.

Main Methods:

  • Insertion of single elastin-like polypeptide (ELP) loops into the lumen cavity of the alpha-hemolysin (alphaHL) pore.
  • Characterization of ion transport through wild-type and ELP-modified alphaHL pores under an applied potential.
  • Analysis of pore behavior at different temperatures relative to the ELP transition temperature.

Main Results:

  • Wild-type alphaHL pores remained open, while ELP-containing pores showed transient current blockades.
  • The nature and frequency of blockades were dependent on the length and sequence of the inserted ELP loop.
  • ELP loops reversibly blocked the pore below their transition temperature and allowed ion flow above it due to dehydration and collapse.

Conclusions:

  • Engineered alphaHL pores with ELP loops exhibit controllable, temperature-dependent ion transport.
  • The reversible blocking mechanism is attributed to the temperature-induced conformational changes of the ELP.
  • These temperature-responsive protein pores hold promise for applications in medical biotechnology and beyond.