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pubmed-article:10827091pubmed:abstractTextArchaeal zinc-containing ferredoxin from Sulfolobus sp. strain 7 contains one [3Fe-4S] cluster (cluster I), one [4Fe-4S] cluster (cluster II), and one isolated zinc center. Oxidative degradation of this ferredoxin led to the formation of a stable intermediate with 1 zinc and approximately 6 iron atoms. The metal centers of this intermediate were analyzed by electron paramagnetic resonance (EPR), low temperature resonance Raman, x-ray absorption, and (1)H NMR spectroscopies. The spectroscopic data suggest that (i) cluster II was selectively converted to a cubane [3Fe-4S](1+) cluster in the intermediate, without forming a stable radical species, and that (ii) the local metric environments of cluster I and the isolated zinc site did not change significantly in the intermediate. It is concluded that the initial step of oxidative degradation of the archaeal zinc-containing ferredoxin is selective conversion of cluster II, generating a novel intermediate containing two [3Fe-4S] clusters and an isolated zinc center. At this stage, significant structural rearrangement of the protein does not occur. We propose a new scheme for oxidative degradation of dicluster ferredoxins in which each cluster converts in a stepwise manner, prior to apoprotein formation, and discuss its structural and evolutionary implications.lld:pubmed
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pubmed-article:10827091pubmed:pagination25391-401lld:pubmed
pubmed-article:10827091pubmed:dateRevised2007-11-14lld:pubmed
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pubmed-article:10827091pubmed:articleTitleSpectroscopic investigation of selective cluster conversion of archaeal zinc-containing ferredoxin from Sulfolobus sp. strain 7.lld:pubmed
pubmed-article:10827091pubmed:affiliationDepartment of Biochemistry and Molecular Biology, Nippon Medical School, Sendagi, Tokyo, Japan. iwasaki/biochem@om.nms.ac.jplld:pubmed
pubmed-article:10827091pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:10827091pubmed:publicationTypeResearch Support, U.S. Gov't, P.H.S.lld:pubmed
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