- Recognise the properties of enzyme and its roles in metabolism.
- Explain enzyme specificity in terms of active site.
Properties of enzyme
👆🏻This photo showing the properties of enzyme.
1. Enzyme with catalytic property
- Enzyme having remarkable catalytic power.
- A small amount of enzyme is already enough for catalysing reaction.
- Enzyme remain unchanged throughout the reaction.
2. Enzyme with specificity
- Enzyme having a specific action that it only acts on a particular substrate and reaction.
3. Enzyme with reversibility
- Enzyme catalysed reactions are reversible and some are not reversible.
- Enzyme can be reused that a small amount of enzyme is required for each of the reaction.
4. Enzyme is sensitive to heat
- Enzyme is extremely sensitive to heat that enzyme work best in optimal temperature.
- Enzyme will be inactive at low temperature.
- Enzyme will be denatured at high temperature.
5. Enzyme is sensitive to pH
- Enzyme is extremely sensitive to heat that enzyme work best in optimal pH.
- Enzyme will be inactive or denatured if not in their optimal pH.
Role of enzyme in metabolism
👆🏻This photo comparing the difference in activation energy of having catalyst - enzyme or without it.
- Enzyme speed up metabolism through lowering the activation energy.
- Enzyme act as a important catalyse in metabolism .
Active site of enzyme
👆🏻This photo showing how substrate binds to active site of enzyme.
- Active site ➡️where the substrate binds to enzyme.
- Amino acid in active sites having different side chain with different properties like acidic, alkaline, hydrophilic or hydrophobic.
- only specific substrate that can bind to the active site of enzyme and undergo chemical reaction.l
- 🔺 The specificity of enzyme is due to the active site of enzyme.
👆🏻Lock and Key hypothesis is commonly used to explain the specificity of enzyme.
🤗 Substrate is like the key while enzyme is like the lock that only a particular key can open a lock like only particular substrate can bind to enzyme and form enzyme-substrate complex.
That's the end of this topic 👏🏻
- mukoshi, J., & Ebc. (n.d.). Easy Biology Class. Retrieved from https://www.easybiologyclass.com/properties-of-enzymes-biochemistry-lecture-notes/
- Enzymes: Properties and Mechanism of Enzyme Action. (2015, August 27). Retrieved from http://www.biologydiscussion.com/enzymes/enzymes-properties-and-mechanism-of-enzyme-action/6145