Abstract
The nucleotide sequence of the psbO gene encoding the extrinsic 33 kDa protein (the Mn-stabilizing protein) from the thermophilic cyanobacterium Synechococcus elongatus was determined. The deduced amino acid sequence consisted of 272 residues; 26 for the signal peptide and 246 for the mature protein. The amino acid sequences of nine proteolytic peptides from the isolated protein completely agreed with the deduced amino acid sequence. Several unique variations of amino acids were found in the primary structure, of which some may be related to the high thermostability of the protein.
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