The Caenorhabditis elegans Y87G2A.14 Nudix hydrolase is a peroxisomal coenzyme A diphosphatase

AbdelRaheim, Salama R and McLennan, Alexander G ORCID: 0000-0002-8057-2222 (2002) The Caenorhabditis elegans Y87G2A.14 Nudix hydrolase is a peroxisomal coenzyme A diphosphatase. BMC Biochemistry, 3 (1). pp. 1-8. ISSN 1471-2091, 1471-2091

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Abstract

Background: The number of Nudix hydrolase family members varies widely among different organisms. In order to understand the reasons for the particular spectrum possessed by a given organism, the substrate specificity and function of different family members must be established. Results: The Y87G2A.14 Nudix hydrolase gene product of Caenorhabditis elegans has been expressed as a thioredoxin fusion protein in Escherichia coli and shown to be a CoA diphosphatase with catalytic activity towards CoA and its derivatives. The products of CoA hydrolysis were 3′,5′-ADP and 4′- phosphopantetheine with Km and kcat values of 220 μM and 13.8 s-1 respectively. CoA esters yielded 3′,5′-ADP and the corresponding acyl-phosphopantetheine. Activity was optimal at pH 9.5 with 5 mM Mg2+ and fluoride was inhibitory with a Ki of 3 μM. The Y87G2A.14 gene product has a potential C-terminal tripeptide PTS1 peroxisomal targeting signal - SKI. By fusing a Y87G2A.14 cDNA to the C-terminus of yeast-enhanced green fluorescent protein, the enzyme appeared to be targeted to peroxisomes by the SKI signal when transfected into yeast cells. Deletion of SKI abolished specific targeting. Conclusions: The presence of related sequences with potential PTS1 or PTS2 peroxisomal targeting signals in other organisms suggests a conserved peroxisomal function for the CoA diphosphatase members of this group of Nudix hydrolases.

Item Type:	Article
Additional Information:	Published: 27 March 2002. 8 pages (page numbers not for citation purposes).
Uncontrolled Keywords:	Escherichia coli, CoA diphosphatase, PTS1, PTS2
Subjects:	?? Q1 ??
Divisions:	Faculty of Health and Life Sciences
Depositing User:	Symplectic Admin
Date Deposited:	07 Jul 2008 15:18
Last Modified:	07 Dec 2024 02:03
DOI:	10.1186/1471-2091-3-5
Publisher's Statement :	© 2002 AbdelRaheim and McLennan; licensee BioMed Central Ltd. This is an Open Access article: verbatim copying and redistribution of this article are permitted in all media for any purpose, provided this notice is preserved along with the article's original URL. The electronic version of this article is the complete one and can be found online at: http://www.biomedcentral.com/1471-2091/3/5
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URI:	https://livrepository.liverpool.ac.uk/id/eprint/796