NDLI: Formation of a linear [3Fe-4S] cluster in a seven-iron ferredoxin triggered by polypeptide unfolding

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Formation of a linear [3Fe-4S] cluster in a seven-iron ferredoxin triggered by polypeptide unfolding

Content Provider	Springer Nature Link
Author	Jones, Kathryn Gomes, Cláudio M. Huber, Harald Teixeira, Miguel Wittung Stafshede, Pernilla
Copyright Year	2002
Abstract	Cubic iron-sulfur ([Fe-S]) clusters are common inorganic cofactors in proteins. The presence of a linear [3Fe-4S] cluster in a protein was first observed in beef-heart aconitase at high pH, where the protein structure was perturbed. Not long ago, the same linear cluster was discovered upon unfolding of a thermophilic di-cluster seven-iron ferredoxin, suggesting a more general relevance for this type of linear clusters in Nature. Since structure-induced cluster rearrangements may be important regulatory, on-going processes in living systems, we decided to further characterize the formation of the linear iron-sulfur cluster observed upon ferredoxin unfolding. Here we present a kinetic investigation of parameters that affect the linear-cluster formation and disassembly in the Sulfolobus acidocaldarius seven-iron ferredoxin. We find the linear cluster to be an intermediate on the protein-mediated cluster-degradation pathway under a wide range of pH and denaturant conditions. The linear species forms in parallel with secondary-structure disappearance. In contrast, the disassembly rate constant for the linear cluster is independent of denaturant concentration but depends strongly on solution pH. At high pH, the disassembly rate is slower and the linear iron-sulfur species has a longer lifetime, than at low pH.
Starting Page	357
Ending Page	362
Page Count	6
File Format	PDF
ISSN	09498257
Journal	JBIC Journal of Biological Inorganic Chemistry
Volume Number	7
Issue Number	4-5
e-ISSN	14321327
Language	English
Publisher	Springer-Verlag
Publisher Date	2001-10-30
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Biochemistry Microbiology
Content Type	Text
Resource Type	Article
Subject	Biochemistry Inorganic Chemistry

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Formation of a linear [3Fe-4S] cluster in a seven-iron ferredoxin triggered by polypeptide unfolding

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