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Gene transcription is regulated by the synergistic action of several proteins that form a complex at a gene regulatory site. This is observed in eukaryotes, where the regulation of gene expression is a complex process. Regulatory proteins in eukaryotes can broadly be classified into two types – regulators that bind directly to specific DNA sequences and co-regulators that associate with regulatory proteins but cannot directly bind to the DNA. These co-regulators are further divided into...
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Transcription activators are proteins that promote the transcription of genes from DNA to RNA. In most cases, these proteins contain two separate domains ‒ a domain that binds to DNA and a domain for activating transcription; however, in some cases, a single domain is responsible for both binding and activation of transcription, as seen in the glucocorticoid receptor and MyoD.
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One example of how cells use the energy contained in electrochemical gradients is demonstrated by glucose transport into cells. The ion vital to this process is sodium (Na+), which is typically present in higher concentrations extracellularly than in the cytosol. Such a concentration difference is due, in part, to the action of an enzyme “pump” embedded in the cellular membrane that actively expels Na+ from a cell. Importantly, as this pump contributes to the high concentration of...
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Related Experiment Video

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Assaying the Kinase Activity of LRRK2 in vitro
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Cellobiohydrolase (CBH) Activity Assays.

Hem Kanta Sharma1, Wensheng Qin2, Chunbao Charles Xu3

  • 1Department of Biology, Lakehead University, Thunder Bay, ON, Canada.

Methods in Molecular Biology (Clifton, N.J.)
|June 2, 2018
PubMed
Summary
This summary is machine-generated.

Accurately measuring cellulase activity is crucial for biofuel production from cellulosic biomass. The Avicel method is highlighted as a promising technique for quantifying cellobiohydrolase (CBH) activity, despite challenges with cellulose heterogeneity and inhibitors.

Keywords:
AvicelCellobiohydrolaseCelluloseELISAEnzyme assayGlucose

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Area of Science:

  • Biotechnology and Bioengineering
  • Renewable Energy
  • Biochemistry

Background:

  • Cellulosic biomass offers a sustainable alternative to fossil fuels for liquid energy production.
  • Assessing cellulase activity is vital for efficient biofuel generation, but challenges exist in enzyme quantification.
  • The synergistic roles of enzymes and substrate specificity in cellulose hydrolysis remain incompletely understood.

Purpose of the Study:

  • To review and outline common and recent methods for cellobiohydrolase (CBH) assay.
  • To discuss the challenges in quantifying hydrolytic enzymes and products due to cellulose heterogeneity and inhibitors.
  • To describe a qualitative screening method for CBH-producing bacteria.

Main Methods:

  • Review of existing cellulase activity assay methods, focusing on CBH quantification.
  • Discussion of substrate selection and enzyme-substrate interactions in hydrolysis.
  • Description of the Avicel method as a key technique for CBH assay.
  • Outline of qualitative screening using carboxymethyl cellulose (CMC) agar plates.

Main Results:

  • The Avicel method is identified as a highly effective technique for CBH assay.
  • Challenges in accurate quantification include cellulose heterogeneity, enzyme-substrate ratios, and inhibitory compounds like cellobiose.
  • A qualitative screening method for identifying CBH-producing bacteria is presented.

Conclusions:

  • Accurate quantification of cellulase activity, particularly CBH, is essential for optimizing biofuel production.
  • The Avicel method provides a reliable approach for CBH assay, though ongoing research is needed to address quantification challenges.
  • Screening methods for CBH-producing microorganisms are valuable for discovering novel enzymes.