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Globular and Fibrous Proteins02:21

Globular and Fibrous Proteins

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Many proteins can be classified into two distinct subtypes - globular or fibrous. These two types differ in their shapes and solubilities.
Globular proteins are also known as spheroproteins and typically are approximately round in shape. They contain a mix of amino acid types and contain differing sequences in their primary structures. Globular proteins have many different functions, such as enzymes, cellular messengers, and molecular transporters. These roles often require the proteins to be...
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Related Experiment Video

Updated: Jan 7, 2026

Material Formation of Recombinant Spider Silks through Aqueous Solvation using Heat and Pressure
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Engineered β-Crystal Domains Enable Strong Humidity-Responsive Actuation in Recombinant Spider Silk.

Min Li1, Huan Chen2, Qi Zhang1

  • 1Department of Biomedical Engineering, the City University of Hong Kong, Hong Kong, 999077, China.

Small (Weinheim an Der Bergstrasse, Germany)
|January 5, 2026
PubMed
Summary

Engineered protein fibers with disulfide crosslinking maintain structural integrity in humidity. These advanced fibers demonstrate superior performance for soft actuators, surpassing human muscle power.

Keywords:
disulfide lockinghumidity‐responsive actuationrecombinant spidroinsrecovery stressβ‐sheet crystallites

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Area of Science:

  • Biomaterials Engineering
  • Protein Engineering
  • Soft Robotics

Background:

  • Conventional polymer actuators lack mechanical strength and humidity tolerance.
  • Replicating spider silk's water-responsive actuation is difficult due to hydration-induced structural changes.
  • Need for robust protein fibers for soft actuators under physiological conditions.

Purpose of the Study:

  • To engineer humidity-responsive protein fibers with enhanced recovery stress and structural integrity.
  • To overcome limitations of conventional actuators using a recombinant spidroin system.
  • To develop a generalizable molecular design for moisture-resilient protein actuators.

Main Methods:

  • Engineered recombinant spidroin fibers with terminal cysteine crosslinking.
  • Utilized shear-assisted wet spinning for site-specific disulfide bond formation.
  • Employed molecular dynamics simulations and spectroscopic analyses to confirm structural integrity.

Main Results:

  • Optimized C4S fibers exhibited preserved beta-sheet alignment even at 90% relative humidity.
  • Achieved reversible and controllable humidity-driven actuation with rapid contraction.
  • Delivered a recovery stress of 45 MPa and work density of 122 kJ m⁻³.

Conclusions:

  • Sequence-encoded crystalline locking provides a robust strategy for moisture-resilient protein actuators.
  • The engineered fibers significantly outperform synthetic actuators and human skeletal muscle.
  • Potential applications include soft robotics, adaptive textiles, and biomedical devices.