UNSPECIFIED (1996) Identification of iron superoxide dismutase and a copper/zinc superoxide dismutase enzyme activity within the marine cyanobacterium Synechococcus sp WH 7803. FEMS MICROBIOLOGY LETTERS, 138 (2-3). pp. 161-165. ISSN 0378-1097

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Abstract

Three constitutive forms of superoxide dismutase activity have been demonstrated in the cyanobacterial marine picoplankter Synechococcus sp. WH 7803 using polyacrylamide gel activity staining techniques. A protein which gave a positive non-haem iron stain on native polyacrylamide gels exhibited N-terminal similarity to both the iron superoxide dismutase and the manganese superoxide dismutase of Escherichia coli. The metal prosthetic group of each of the three activity bands was characterised by analysing their differential sensitivities to 5 mM H2O2, 2 mM cyanide and 2 mM of the copper chelator diethyldithiocarbamate. Three distinct superoxide dismutase activities were observed, an iron superoxide dismutase, a copper/zinc superoxide dismutase and a third form which has not been identified. Growth of Synechococcus cells in ASW medium containing no added iron resulted in no alteration in the activity of the iron superoxide dismutase. Growth of cultures in the absence of copper or zinc resulted in differential changes in the activities of the copper/zinc superoxide dismutase and the unidentified superoxide dismutase.

Item Type:	Journal Article
Subjects:	Q Science > QR Microbiology
Journal or Publication Title:	FEMS MICROBIOLOGY LETTERS
Publisher:	ELSEVIER SCIENCE BV
ISSN:	0378-1097
Date:	1 May 1996
Volume:	138
Number:	2-3
Number of Pages:	5
Page Range:	pp. 161-165
Publication Status:	Published
URI:	http://wrap.warwick.ac.uk/id/eprint/18783

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