Expansin Reconstitution
Expansin Reconstitution - Related Videos
07:05
Reconstitution of Membrane Proteins
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2023
Reconstitution is the process of returning an isolated biomolecule to its original form or function. This is particularly useful for studying membrane proteins, which enable important cellular functions and affect the behavior of nearby lipids. To study the function of purified membrane proteins in situ, they must be reconstituted by integrating them into an artificial lipid membrane. This video introduces membrane protein reconstitution concepts and related procedures, such as protein...
09:25
In vitro Reconstitution of the Active T. castaneum Telomerase
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Cited by 5 •
2011
Efforts to isolate the catalytic subunit of telomerase, TERT, in sufficient quantities for structural studies, have been met with limited success for more than a decade. Here, we present methods for the isolation of the recombinant Tribolium castaneum TERT (TcTERT) and the reconstitution of the active T. castaneum telomerase ribonucleoprotein (RNP) complex in vitro.
09:51
Measuring Plant Cell Wall Extension (Creep) Induced by Acidic pH and by Alpha-Expansin
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Cited by 43 •
2009
We demonstrate the use of a constant-force extensometer to measure long-term extension (creep) of plant cell wall specimens induced by acidic buffers and expansin protein.
09:26
Reconstitution of Nucleosomes with Differentially Isotope-labeled Sister Histones
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Cited by 1 •
2017
This protocol describes the reconstitution of nucleosomes containing differentially isotope-labeled sister histones. At the same time, asymmetrically post-translationally modified nucleosomes can be generated after using a premodified histone copy. These preparations can be readily used to study modification crosstalk mechanisms, simultaneously on both sister histones, by using high-resolution NMR spectroscopy.
12:25
A Step-by-step Method for the Reconstitution of an ABC Transporter into Nanodisc Lipid Particles
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Cited by 23 •
2012
Nanodiscs are small discoid particles that incorporate membrane proteins into a small patch of phospholipid bilayer. We provide a visual protocol that shows the step-by-step incorporation of the MalFGK2 transporter into a disc.
FAQs
Expansins weaken noncovalent interactions linking cellulose microfibrils with matrix polysaccharides. This loosening changes the wall’s mechanical behavior while avoiding substantial hydrolysis of its structural polymers. Reconstitution therefore helps separate physical disruption of wall architecture from enzymatic polymer breakdown, providing a way to investigate how expansin activity can contribute to growth-related wall extension.
Acidic conditions provide the experimental setting in which expansins bind to wall components and promote loosening. If this condition is altered, the observed response may not reflect the protein’s active behavior in the reconstructed system. Controlling acidity is therefore essential when relating expansin treatment to changes in wall extension, stress relaxation, or mechanical strength.
The key interactions are noncovalent connections between cellulose microfibrils and matrix polysaccharides. Expansin activity is interpreted through its effect on these associations rather than through substantial cleavage of the wall polymers. Focusing on this interface helps researchers connect molecular protein function with larger changes in wall architecture and the capacity of the material to expand.
Wall extension, stress relaxation, and mechanical strength provide complementary readouts. Extension indicates how readily the wall lengthens, stress relaxation reflects how force changes when deformation is maintained, and mechanical-strength measurements indicate resistance to deformation. Together, these outcomes connect expansin activity with physical wall loosening instead of relying only on protein binding as evidence of function.
A reconstructed system requires purified expansin proteins, isolated plant cell wall materials, and conditions that support expansin activity, including acidity. The wall preparation supplies the structural substrate, while the purified protein allows its contribution to be examined directly. Researchers can then assess how the defined protein-wall combination changes extension, relaxation, or mechanical strength.
By reducing the system to purified proteins and isolated wall materials, researchers can examine the relationship between expansin function and tissue-scale expansion more directly. Mechanical outcomes reveal how changes in wall interactions affect growth potential. This approach supports investigations of plant cell wall architecture, the molecular basis of growth, and differences in protein function.
Results from these experiments can inform studies of crop development and the engineering of plant biomass properties. Measuring how expansins modify wall mechanics helps relate molecular activity to traits involving expansion and material behavior. The same framework also provides context for evaluating cell wall structure and identifying how protein function may influence useful plant materials.