Monothiol glutaredoxins play a crucial role in iron-sulfur (Fe/S) protein biogenesis. Essentially all of them can coordinate a [2Fe-2S] cluster and have been proposed to mediate the transfer of [2Fe-2S] clusters from scaffold proteins to target apo proteins, possibly by acting as cluster transfer proteins. The molecular basis of [2Fe-2S] cluster transfer from monothiol glutaredoxins to target proteins is a fundamental, but still unresolved, aspect to be defined in Fe/S protein biogenesis. In mitochondria monothiol glutaredoxin 5 (GRX5) is involved in the maturation of all cellular Fe/S proteins and participates in cellular iron regulation. Here we show that the structural plasticity of the dimeric state of the [2Fe-2S] bound form of human GRX5 (holo hGRX5) is the crucial factor that allows an efficient cluster transfer to the partner proteins human ISCA1 and ISCA2 by a specific protein-protein recognition mechanism. Holo hGRX5 works as a metallochaperone preventing the [2Fe-2S] cluster to be released in solution in the presence of physiological concentrations of glutathione and forming a transient, cluster-mediated protein-protein intermediate with two physiological protein partners receiving the [2Fe-2S] cluster. The cluster transfer mechanism defined here may extend to other mitochondrial [2Fe-2S] target proteins.

[2Fe-2S] cluster transfer in iron-sulfur protein biogenesis / Banci L, Brancaccio D, Ciofi-Baffoni S, Del Conte R, Gadepalli R, Mikolajczyk M, Neri S, Piccioli M, Winkelmann J.. - In: PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA. - ISSN 0027-8424. - STAMPA. - 111(2014), pp. 6203-6208. [10.1073/pnas.1400102111]

[2Fe-2S] cluster transfer in iron-sulfur protein biogenesis

Banci L;Ciofi-Baffoni S;Del Conte R;Mikolajczyk M;Neri S;Piccioli M;Winkelmann J.
2014

Abstract

Monothiol glutaredoxins play a crucial role in iron-sulfur (Fe/S) protein biogenesis. Essentially all of them can coordinate a [2Fe-2S] cluster and have been proposed to mediate the transfer of [2Fe-2S] clusters from scaffold proteins to target apo proteins, possibly by acting as cluster transfer proteins. The molecular basis of [2Fe-2S] cluster transfer from monothiol glutaredoxins to target proteins is a fundamental, but still unresolved, aspect to be defined in Fe/S protein biogenesis. In mitochondria monothiol glutaredoxin 5 (GRX5) is involved in the maturation of all cellular Fe/S proteins and participates in cellular iron regulation. Here we show that the structural plasticity of the dimeric state of the [2Fe-2S] bound form of human GRX5 (holo hGRX5) is the crucial factor that allows an efficient cluster transfer to the partner proteins human ISCA1 and ISCA2 by a specific protein-protein recognition mechanism. Holo hGRX5 works as a metallochaperone preventing the [2Fe-2S] cluster to be released in solution in the presence of physiological concentrations of glutathione and forming a transient, cluster-mediated protein-protein intermediate with two physiological protein partners receiving the [2Fe-2S] cluster. The cluster transfer mechanism defined here may extend to other mitochondrial [2Fe-2S] target proteins.
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Banci L, Brancaccio D, Ciofi-Baffoni S, Del Conte R, Gadepalli R, Mikolajczyk M, Neri S, Piccioli M, Winkelmann J.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/2158/862559
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