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Characterization of superoxide dismutases in anoxia- and hyperoxia-tolerant symbiotic cnidarians

Characterization of superoxide dismutases in anoxia- and hyperoxia-tolerant symbiotic cnidarians
Characterization of superoxide dismutases in anoxia- and hyperoxia-tolerant symbiotic cnidarians
Many cnidarians, such as sea anemones, contain photosynthetic symbiotic dinoflagellates called zooxanthellae. During a light/dark cycle, the intratentacular O(2) state changes in minutes from hypoxia to hyperoxia (3-fold normoxia). To understand the origin of the high tolerance to these unusual oxic conditions, we have characterized superoxide dismutases (SODs) from the three cellular compartments (ectoderm, endoderm and zooxanthellae) of the Mediterranean sea anemone Anemonia viridis. The lowest SOD activity was found in ectodermal cells while endodermal cells and zooxanthellae showed a higher SOD activity. Two, seven and six SOD activity bands were identified on native PAGE in ectoderm, endoderm and zooxanthellae, respectively. A CuZnSOD was identified in both ectodermal and endodermal tissues. MnSODs were detected in all compartments with two different subcellular localizations. One band displays a classical mitochondrial localization, the three others being extramitochondrial. FeSODs present in zooxanthellae also appeared in endodermal host tissue. The isoelectric points of all SODs were distributed between 4 and 5. For comparative study, a similar analysis was performed on the whole homogenate of a scleractinian coral Stylophora pistillata. These results are discussed in the context of tolerance to hyperoxia and to the transition from anoxia to hyperoxia.
0304-4165
84-91
Richier, Sophie
0fc0b375-6918-4c06-9d6f-229f6c4046ca
Merle, Pierre-Laurent
57d40c27-ef81-4395-9085-541acd320f3a
Furla, Paola
d3e7b181-371a-4a7a-8749-594e704d10d7
Pigozzi, Delphine
cecf49dd-00a3-4ee5-b308-c2946980022a
Sola, François
04c37d25-4502-449a-b734-6fe1fac3f6fd
Allemand, Denis
a9a9145a-9129-4827-83ae-f204d180d945
Richier, Sophie
0fc0b375-6918-4c06-9d6f-229f6c4046ca
Merle, Pierre-Laurent
57d40c27-ef81-4395-9085-541acd320f3a
Furla, Paola
d3e7b181-371a-4a7a-8749-594e704d10d7
Pigozzi, Delphine
cecf49dd-00a3-4ee5-b308-c2946980022a
Sola, François
04c37d25-4502-449a-b734-6fe1fac3f6fd
Allemand, Denis
a9a9145a-9129-4827-83ae-f204d180d945

Richier, Sophie, Merle, Pierre-Laurent, Furla, Paola, Pigozzi, Delphine, Sola, François and Allemand, Denis (2003) Characterization of superoxide dismutases in anoxia- and hyperoxia-tolerant symbiotic cnidarians. Biochimica et Biophysica Acta (BBA) - Biomembranes, 1621 (1), 84-91. (doi:10.1016/S0304-4165(03)00049-7). (PMID:12667614)

Record type: Article

Abstract

Many cnidarians, such as sea anemones, contain photosynthetic symbiotic dinoflagellates called zooxanthellae. During a light/dark cycle, the intratentacular O(2) state changes in minutes from hypoxia to hyperoxia (3-fold normoxia). To understand the origin of the high tolerance to these unusual oxic conditions, we have characterized superoxide dismutases (SODs) from the three cellular compartments (ectoderm, endoderm and zooxanthellae) of the Mediterranean sea anemone Anemonia viridis. The lowest SOD activity was found in ectodermal cells while endodermal cells and zooxanthellae showed a higher SOD activity. Two, seven and six SOD activity bands were identified on native PAGE in ectoderm, endoderm and zooxanthellae, respectively. A CuZnSOD was identified in both ectodermal and endodermal tissues. MnSODs were detected in all compartments with two different subcellular localizations. One band displays a classical mitochondrial localization, the three others being extramitochondrial. FeSODs present in zooxanthellae also appeared in endodermal host tissue. The isoelectric points of all SODs were distributed between 4 and 5. For comparative study, a similar analysis was performed on the whole homogenate of a scleractinian coral Stylophora pistillata. These results are discussed in the context of tolerance to hyperoxia and to the transition from anoxia to hyperoxia.

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Published date: 7 April 2003
Organisations: Molecular and Cellular

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Local EPrints ID: 341909
URI: http://eprints.soton.ac.uk/id/eprint/341909
ISSN: 0304-4165
PURE UUID: a9b95d84-1861-458f-978f-26101b27ea57

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Date deposited: 15 Aug 2012 13:44
Last modified: 14 Mar 2024 11:45

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Contributors

Author: Sophie Richier
Author: Pierre-Laurent Merle
Author: Paola Furla
Author: Delphine Pigozzi
Author: François Sola
Author: Denis Allemand

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