Neuroglobin (Ngb) is a member of the globin family expressed in the vertebrate brain, involved in neuroprotection. A combined approach of X-ray diffraction (XRD) on single crystal and X-ray absorption spectroscopy (XAS) in solution, allows to determine the oxidation state and the structure of the Fe-heme both in the bis-histidine and the CO-bound (NgbCO) states. The overall data demonstrate that under Xray the iron is photoreduced fairly rapidly, and that the previously reported X-ray structure of ferric Ngb [B. Vallone, K. Nienhaus, M. Brunori, G.U. Nienhaus, Proteins 56 (2004) 85-92] very likely refers to a photoreduced species indistinguishable from the dithionite reduced protein. Results from the XAS analysis of NgbCO in solution are in good agreement with XRD data on the crystal. However prolonged X-ray exposure at 15 K determines CO release. This preliminary result paves the way to experiments aimed at the characterization of pentacoordinate ferrous Ngb, the only species competent in binding external ligands such as O-2, CO or NO. (C) 2008 Elsevier Inc. All rights reserved.

An X-ray diffraction and X-ray absorption spectroscopy joint study of neuroglobin / Arcovito, Alessandro; Moschetti, Tommaso; D'Angelo, Paola; Mancini, Giordano; Vallone, Beatrice; Brunori, Maurizio; Stefano Della, Longa. - In: ARCHIVES OF BIOCHEMISTRY AND BIOPHYSICS. - ISSN 0003-9861. - STAMPA. - 475:1(2008), pp. 7-13. [10.1016/j.abb.2008.03.026]

An X-ray diffraction and X-ray absorption spectroscopy joint study of neuroglobin

ARCOVITO, Alessandro;MOSCHETTI, TOMMASO;D'ANGELO, Paola;VALLONE, Beatrice;BRUNORI, Maurizio;
2008

Abstract

Neuroglobin (Ngb) is a member of the globin family expressed in the vertebrate brain, involved in neuroprotection. A combined approach of X-ray diffraction (XRD) on single crystal and X-ray absorption spectroscopy (XAS) in solution, allows to determine the oxidation state and the structure of the Fe-heme both in the bis-histidine and the CO-bound (NgbCO) states. The overall data demonstrate that under Xray the iron is photoreduced fairly rapidly, and that the previously reported X-ray structure of ferric Ngb [B. Vallone, K. Nienhaus, M. Brunori, G.U. Nienhaus, Proteins 56 (2004) 85-92] very likely refers to a photoreduced species indistinguishable from the dithionite reduced protein. Results from the XAS analysis of NgbCO in solution are in good agreement with XRD data on the crystal. However prolonged X-ray exposure at 15 K determines CO release. This preliminary result paves the way to experiments aimed at the characterization of pentacoordinate ferrous Ngb, the only species competent in binding external ligands such as O-2, CO or NO. (C) 2008 Elsevier Inc. All rights reserved.
2008
exafs; hemeproteins; neuroprotection; synchrotron radiation; xanes
01 Pubblicazione su rivista::01a Articolo in rivista
An X-ray diffraction and X-ray absorption spectroscopy joint study of neuroglobin / Arcovito, Alessandro; Moschetti, Tommaso; D'Angelo, Paola; Mancini, Giordano; Vallone, Beatrice; Brunori, Maurizio; Stefano Della, Longa. - In: ARCHIVES OF BIOCHEMISTRY AND BIOPHYSICS. - ISSN 0003-9861. - STAMPA. - 475:1(2008), pp. 7-13. [10.1016/j.abb.2008.03.026]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/44523
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