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Biochim Biophys Acta. 2000 Apr 25;1491(1-3):248-52.

Molecular cloning and sequencing of the sodB gene from a heterocystous cyanobacterium Anabaena sp. PCC 7120.

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College of Life Sciences, Peking University, Beijing, China.


Superoxide dismutase (Sod) plays an important role in all aerobic organisms. The sodB gene of a heterocystous cyanobacterium Anabaena sp. PCC 7120 was cloned and sequenced. The Sod protein is predicted to have 199 amino acids and a molecular mass of 22.5 kDa. Sequence comparison among SodB from cyanobacteria and chloroplasts revealed that the sodB gene indeed encodes an iron-Sod. Northern blot analysis showed that the sodB gene of Anabaena sp. PCC 7120 is transcribed as a single gene and its expression was up-regulated when the cells were subjected to a shift from a nitrogen repletion condition to a nitrogen depletion condition.

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