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Properties of acetylcholinesterase from Pisum sativum

Kasturi, Ranganna and Vasantharajan, VN (1976) Properties of acetylcholinesterase from Pisum sativum. In: Phytochemistry, 15 (9). pp. 1345-1347.

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Acetylcholinesterase (AChE) from Pisum sativum purified 28 fold showed two closely moving protein bands on polyacrylamide gel electrophoresis, both of which have AChE activity. AChE activity occurs in roots, stem and leaves, that in roots varying with age. Activity is optimal at pH 9 and at 30”. The energy of activation is 9.82 x lo3 J per mol and MW is greater than 200000. Although the enzyme can hydrolyze both choline and non-choline esters, it has greater affinity for acetylthiocholine (ATCh) and acetylcholine (ACh). ATCh inhibits the enzyme at higher concentrations and the K, is 0.2 mM with this as substrate. The enzyme is not as sensitive to Eserine as it is to Neostigmine. It is also inhibited by organophosphorus pesticides such as Fensulfothion, Parathion and Dimethoate. Treatment of the seeds with Fensulfothion [O, O-diethyl (p-methylsulfinylphenyl) phosphorothioate] affects growth and secondary root development. This might be explained by its inhibition of AChE and the consequent increase of endogenous levels of ACh.

Item Type: Journal Article
Publication: Phytochemistry
Publisher: Elservier Science
Additional Information: Copyright of this article belongs to Elsevier Science.
Keywords: Pisum sativum: Leguminosae; pea; acetylcholinesterase; acetylcholine; fensulfothion.
Department/Centre: Division of Biological Sciences > Microbiology & Cell Biology
Date Deposited: 09 Dec 2009 12:38
Last Modified: 19 Sep 2010 05:49
URI: http://eprints.iisc.ac.in/id/eprint/24198

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