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Summary
Allantoin racemase from Candida utilis racemizes allantoin by releasing a hydrogen atom from its asymmetric carbon. This enzymatic mechanism differs from non-enzymic racemization, which shows minimal hydrogen release.
Area of Science:
- Enzymology
- Biochemistry
- Microbial metabolism
Background:
- Allantoin racemase is an enzyme involved in allantoin metabolism.
- Understanding the enzymatic mechanism of racemization is crucial for biochemical studies.
Purpose of the Study:
- To isolate and purify allantoin racemase from Candida utilis.
- To investigate the mechanism of allantoin racemization catalyzed by the purified enzyme.
- To compare the enzymatic mechanism with non-enzymic racemization.
Main Methods:
- Isolation and purification of allantoin racemase using DEAE-cellulose and Sephadex G-100 chromatography.
- Enzymatic racemization of allantoin in deuterium oxide.
- Analysis using polarimetry and Proton Nuclear Magnetic Resonance (PMR) spectroscopy.
Main Results:
- Purified allantoin racemase was obtained from Candida utilis.
- Enzymatic racemization of allantoin was shown to occur in parallel with the release of the hydrogen atom at the C-5 position.
- Non-enzymic racemization resulted in significantly less or no release of the allantoin 5-H atom.
Conclusions:
- The mechanism of allantoin racemization by allantoin racemase involves the release of the hydrogen atom at the asymmetric carbon.
- The enzymatic mechanism of racemization is distinct from non-enzymic racemization.