Enzyme Engineering
Enzyme Engineering - Related Videos
08:10
Multi-enzyme Screening Using a High-throughput Genetic Enzyme Screening System
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Cited by 7 •
2016
This work presents a method of high-throughput screening using a universal genetic enzyme screening system that can be theoretically applied to over 200 enzymes. Here, the single screening system identifies three different enzymes (lipase, cellulase, and alkaline phosphatase) by simply changing the substrate used (p-nitrophenyl acetate, p-nitrophenyl-β-D-cellobioside, and phenyl phosphate).
02:34
Enzymes
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2020
Inside living organisms, enzymes act as catalysts for many biochemical reactions involved in cellular metabolism. The role of enzymes is to reduce the activation energies of biochemical reactions by forming complexes with its substrates. The lowering of activation energies favor an increase in the rates of biochemical reactions. Enzyme deficiencies can often translate into life-threatening diseases. For example, a genetic abnormality resulting in the deficiency of the enzyme G6PD...
10:38
An Overview of Genetic Engineering
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2023
Genetic engineering – the process of purposefully altering an organism’s DNA – has been used to create powerful research tools and model organisms, and has also seen many agricultural applications. However, in order to engineer traits to tackle complex agricultural problems such as stress tolerance, or to realize the promise of gene therapy for treating human diseases, further advances in the field are still needed. Important considerations include the safe and efficient delivery of genetic...
04:35
Enzyme Activity - Concepts
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2019
Biological Catalysts All living organisms continuously perform numerous biochemical reactions to sustain their presence. Most of these reactions require an input of energy to start, which is called the activation energy. Catalysts are chemicals that lower the activation energy. Even though catalysts facilitate a chemical reaction, they are not consumed by it. This means a catalyst can facilitate a specific chemical reaction over and over in succession, increasing the rate of that reaction.
01:19
Enzyme Kinetics
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2019
Enzymes speed up reactions by lowering the activation energy of the reactants. The speed at which the enzyme turns reactants into products is called the rate of reaction. Several factors impact the rate of reaction, including the number of available reactants. Enzyme kinetics is the study of how an enzyme changes the rate of a reaction. Scientists typically study enzyme kinetics with a fixed amount of enzyme in the controlled environment of a test tube. When more reactant, or substrate, is...
FAQs
Rational design uses information about an enzyme’s structure and function to select targeted amino acid changes. Instead of modifying the sequence randomly, researchers focus on substitutions expected to influence catalytic performance, substrate recognition, stability, or usable reaction conditions. This approach can also test proposed links between particular sequence features and the enzyme’s observed behavior.
Directed evolution improves enzymes through an iterative selection process. Researchers generate genetic variation, express the resulting enzyme variants, and screen them for the desired performance. Variants with useful properties become the basis for additional cycles, allowing improvement even when the precise structural reason for a successful change is not fully known.
Changes in amino acid sequence can alter catalytic performance, including activity, stability, specificity, or the reaction conditions an enzyme can tolerate. Studying these effects helps researchers connect sequence with function rather than treating improved activity as an isolated result. That relationship provides a biological basis for selecting or designing variants with defined characteristics.
Rational design begins with structure and function to introduce selected sequence changes, whereas directed evolution relies on repeated genetic variation, expression, and screening. The two strategies therefore differ in how variants are generated and chosen. Both can improve enzyme performance, but they provide complementary ways to investigate sequence-function relationships and obtain useful variants.
A directed-evolution workflow starts by generating genetic variation, followed by expression of the resulting enzyme variants. Researchers then screen those variants for a desired improvement, such as altered activity, specificity, stability, or reaction conditions. The best-performing candidates can enter another variation and screening cycle, creating an iterative route toward enhanced performance.
Engineered enzymes support applications in industrial biocatalysis, medicine, environmental processes, and synthetic biology. Their altered properties can improve reaction efficiency, expand the range of substrates they act on, or enable useful chemical transformations in biological systems. These outcomes make enzyme engineering relevant both for practical biotechnology and for investigating how biological catalysts function.