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Molecules 2012, 17(4), 4522-4532; doi:10.3390/molecules17044522
Article

Gene Cloning, Expression and Activity Analysis of Manganese Superoxide Dismutase from Two Strains of Gracilaria lemaneiformis (Gracilariaceae, Rhodophyta) under Heat Stress

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Received: 6 February 2012 / Revised: 22 March 2012 / Accepted: 4 April 2012 / Published: 16 April 2012
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Abstract

Manganese superoxide dismutase (Mn-SOD) plays a crucial role in antioxidant responses to environmental stress. To determine whether Mn-SOD affects heat resistance of Gracilaria lemaneiformis, we cloned Mn-SOD cDNA sequences of two strains of this red alga, wild type and cultivar 981. Both cDNA sequences contained an ORF of 675 bp encoding 224 amino acid residues. The cDNA sequences and the deduced amino acid sequences of the two strains shared relatively high identity (more than 99%). No intron existed in genomic DNA of Mn-SOD in G. lemaneiformis. Southern blotting indicated that there were multiple copies, possibly four, of Mn-SOD in both strains. Both in the wild type and cultivar 981, SOD mRNA transcription and SOD activity increased under high temperature stress, while cultivar 981 was more heat resistant based on its SOD activity. This research suggests that there may be a direct relationship between SOD activity and the heat resistance of G. lemaneiformis.
Keywords: Gracilaria lemaneiformis; heat resistance; Mn-SOD; gene expression; SOD activity Gracilaria lemaneiformis; heat resistance; Mn-SOD; gene expression; SOD activity
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Lu, N.; Zang, X.; Zhang, X.; Chen, H.; Feng, X.; Zhang, L. Gene Cloning, Expression and Activity Analysis of Manganese Superoxide Dismutase from Two Strains of Gracilaria lemaneiformis (Gracilariaceae, Rhodophyta) under Heat Stress. Molecules 2012, 17, 4522-4532.

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