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Usage

Uses

Used in Biosensor Applications:
Choline oxidase from Alcaligenes sp. is used as a key component in the construction of choline biosensors. These biosensors are designed to measure cholinesterase inhibitory activities, which are essential for understanding the effects of certain drugs and toxins on the nervous system.
Used in Spectroscopy Studies:
Choline oxidase from Alcaligenes sp. is also used in spectroscopic studies to investigate the photoreaction of choline oxidase with covalently bound flavin. This research helps to better understand the enzyme's structure and function, as well as its potential applications in various fields.
Used in Enzymatic Determination of Choline:
Choline oxidase from Sigma is used in the enzymatic determination of choline in milk using a flow injection analysis (FIA) system with potentiometric detection. This method allows for accurate and efficient measurement of choline levels in milk, which is important for assessing the nutritional value and quality of dairy products.

Biochem/physiol Actions

Choline oxidase catalyzes the four-electron oxidation of choline to glycine-betaine, with betaine-aldehyde as intermediate and molecular oxygen as primary electron acceptor. The enzyme can also accept betaine-aldehyde as a substrate. This allows the investigation of the reaction mechanism for the conversion of choline to the aldehyde intermediate and of betaine-aldehyde to glycine-betaine. The enzyme is a flavoprotein with a molecular weight of approximately 83,000 Da according to gel filtration or approximately 71,000 Da according to SDS gel electrophoresis. The optimum pH is found to be around pH 7.5 and the isoelectric point (pI) around pH 4.5.