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Citrate lyase: a pantothenate-containing enzyme.
Summary
Citrate lyase inactivation can be reversed by acetic anhydride if sulfhydryl groups are reduced. Alkaline hydrolysis reveals phosphopantothenate in the enzyme, crucial for its function.
Area of Science:
- Biochemistry
- Enzymology
Background:
- Citrate lyase is a key enzyme in microbial metabolism.
- Understanding enzyme inactivation and reactivation is vital for biochemical research.
Purpose of the Study:
- To investigate the reactivation mechanism of Klebsiella aerogenes citrate lyase.
- To determine the composition of citrate lyase.
Main Methods:
- Enzyme inactivation using substrate or hydroxylamine.
- Enzyme reactivation with acetic anhydride under reducing conditions.
- Alkaline hydrolysis of purified enzyme.
Main Results:
- Inactivated citrate lyase can be reactivated by acetic anhydride, contingent on sulfhydryl group reduction.
- Alkaline hydrolysis of citrate lyase liberates approximately 3 moles of phosphopantothenate per mole of enzyme.
Conclusions:
- Sulfhydryl groups are critical for the reactivation of citrate lyase.
- Phosphopantothenate is a significant component of citrate lyase structure and function.