Selective X-ray-induced NO photodissociation in haemoglobin crystals: evidence from a Raman-assisted crystallographic study(555 views) Merlino A, Fuchs MR, Pica A, Balsamo A, Dworkowski FSN, Pompidor G, Mazzarella L, Vergara A
Department of Chemical Sciences, University of Naples Federico II, Via Cintia, I-80126 Naples, Italy
Istituto di Biostrutture e Bioimmagini, CNR, Naples, Italy
Swiss Light Source, Paul Scherrer Institute, Villigen, Switzerland
References: Not available.
Selective X-ray-induced NO photodissociation in haemoglobin crystals: evidence from a Raman-assisted crystallographic study
Despite their high physiological relevance, haemoglobin crystal structures with NO bound to haem constitute less than 1% of the total ligated haemoglobins (Hbs) deposited in the Protein Data Bank. The major difficulty in obtaining NO-ligated Hbs is most likely to be related to the oxidative denitrosylation caused by the high reactivity of the nitrosylated species with O-2. Here, using Raman-assisted X-ray crystallography, it is shown that under X-ray exposure (at four different radiation doses) crystals of nitrosylated haemoglobin from Trematomus bernacchii undergo a transition, mainly in the beta chains, that generates a pentacoordinate species owing to photodissociation of the Fe-NO bond. These data provide a physical explanation for the low number of nitrosylated Hb structures available in the literature.
Selective X-ray-induced NO photodissociation in haemoglobin crystals: evidence from a Raman-assisted crystallographic study
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Selective X-ray-induced NO photodissociation in haemoglobin crystals: evidence from a Raman-assisted crystallographic study
Santulli G, Cipolletta E, Sorriento D, Del Giudice C, Anastasio A, Monaco S, Maione AS, Condorelli G, Puca A, Trimarco B, Illario M, Iaccarino G * CaMK4 gene deletion induces hypertension(452 views) J Am Heart Assoc Journal Of The American Heart Association (ISSN: 2047-9980), 2012; 1(4): N/D-N/D. Impact Factor:2.882 ViewExport to BibTeXExport to EndNote