The primary structure of iron-superoxide dismutase from Photobacterium leiognathi

The complete amino acid sequence of iron-superoxide dismutase from Photobacterium leiognathi was determined. The sequence was deduced following characterization of the peptides obtained from tryptic, chymotryptic, and Staphylococcus aureus V-8 protease digests of the apoprotein. The amino acid sequence listed below is made up of 193 residues. It is the first complete sequence to be determined for an iron-superoxide dismutase. The iron-superoxide dismutase shows the same order of homology with the manganese-superoxide dismutases as these enzymes show among themselves. No homology was observed with the copper/zinc-containing class of superoxide dismutases. Ala-Phe-Glu-Leu-Pro-Ala-Leu-Pro-Phe-Ala-Met-Asn-Ala-Leu-Glu-Pro-His-Ile- Ser-Gln-Glu-Thr-Leu-Glu-Tyr-His-Tyr-Gly-Lys-His-His-Asn-Thr-Tyr-Val-Val- Lys-Leu-Asn-Gly-Leu-Val-Glu-Gly-Thr-Glu-Leu-Ala-Glu-Lys-Ser-Leu-Glu-Glu- Ile-Ile-Lys-Thr-Ser-Thr-Gly-Gly-Val-Phe-Asn-Asn-Ala-Ala-Gln-Val-Trp-Asn- His-Thr-Phe-Tyr-Trp-Asn-Cys-Leu-Ala-Pro-Asn-Ala-Gly-Gly-Glu-Pro-Thr-Gly- Glu-Val-Ala-Ala-Ala-Ile-Glu-Lys-Ala-Phe-Gly-Ser-Phe-Ala-Glu-Phe-Lys-Ala- Lys-Phe-Thr-Asp-Ser-Ala-Ile-Asn-Asn-Phe-Gly-Ser-Ser-Trp-Thr-Trp-Leu-Val- Lys-Asn-Ala-Asn-Gly-Ser-Leu-Ala-Ile-Val-Asn-Thr-Ser-Asn-Ala-Gly-Cys-Pro- Ile-Thr-Glu-Glu-Gly-Val-Thr-Pro-Leu-Leu-Thr-Val-Asp-Leu-Trp-Glu-His-Ala- Tyr-Tyr-Ile-Asp-Tyr-Arg-Asn-Leu-Arg-Pro-Ser-Tyr-Met-Asp-Gly-Phe-Trp-Ala- Leu-Val-Asn-Trp-Asp-Phe-Val-Ser-Lys-Asn-Leu-Ala-Ala.