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Purification and characterization of putrescine synthase from cucumber seedlings. A multifunctional enzyme involved in putrescine biosynthesis

Prasad, GL and Adiga, PR (1986) Purification and characterization of putrescine synthase from cucumber seedlings. A multifunctional enzyme involved in putrescine biosynthesis. In: Journal of Biosciences, 10 (3). pp. 373-391.

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Abstract

The multifunctional enzyme, putrescine synthase has been purified from Cucumis sativus and characterized. This enzyme harbours agmatine iminohydrolase, ornithine transcarbamylase, putrescine transcarbamylase and carbamate kinase activities, whose concerted action results in agmatine \rightarrow putrescine conversion. The enzyme resolved into two aggregation forms, enzyme aggregated and enzyme monomer upon electrophoresis at pH 8·3. Evidence has been provided by two-dimensional gel electrophoresis that both enzyme aggregated and enzyme monomer comprise of identical polypeptide chains. Under non-reducing conditions on sodium dodecyl sulphate-polyacrylamide gel electrophoresis, the protein moves as a single 150 KDa polypeptide; however, in the presence of 2-mercaptoethanol on sodium dodecyl sulphate-polyacrylamide gel electrophoresis, it migrates as 3 polypeptides of molecular weight 48,000, 44,000 and 15,000. The enzyme undergoes age-dependent in vivo proteolytic degradation from a 66 KDa polypeptide (primary translational product), through 48 KDa polypeptide to 44 KDa species and finally to small molecular weight peptides.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to Indian Academy of Sciences.
Keywords: Multifunctional enzyme;purification;proteolysis;putrescine biosynthesis.
Department/Centre: Division of Biological Sciences > Biochemistry
Date Deposited: 13 Apr 2008
Last Modified: 01 Mar 2012 06:02
URI: http://eprints.iisc.ernet.in/id/eprint/13725

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