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Amino-acid sequence of a tetrameric, manganese superoxide dismutase from Thermus thermophilus HB8.

The amino-acid sequence of a tetrameric manganese superoxide dismutase from Thermus thermophilus HB8 has been determined. The protein was cleaved with cyanogen bromide (BrCN) into four peptides and their alignment was deduced through the fragment of partial cleavage with BrCN and the peptides were produced by cleavage of the protein with o-iodosobenzoic acid. Most of the peptides were sequenced by solid phase Edman degradation. Some of the peptides were sequenced by the Edman dansyl method after sub-fragmentation by proteinase digestion. The amino-acid sequence consists of 203 residues corresponding to a subunit molecular weight of 23,144.