-
- H M Steinman.
- J. Biol. Chem. 1978 Dec 25; 253 (24): 8708-20.
AbstractThe complete amino acid sequence of the mangano superoxide dismutase from Escherichia coli B has been deduced through characterization of peptides from cyanogen bromide, bromonitrophenylsulfenyl skatole, citraconylated tryptic, and succinylated tryptic digests of the intact polypeptide chain and through subfragmentation of selected peptides with chymotrypsin, thermolysin, trypsin, and Staphylococcus aureus V8 extracellular protease. No significant homology is detected on comparison with the sequence of the copper- and zinc-containing superoxide dismutase from bovine erythrocytes, indicating that the manganese-iron and the copper-zinc classes of dismutases arose from independent evolutionary ancestors, a proposal previously based solely on enzymological and NH2-terminal sequence data. The amino acid sequence listed below corresponds to a molecular weight of 22,900 and appears to be identical in each subunit polypeptide of the native enzyme dimer. formula: (see text).
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