Conformational changes occurring upon reduction and NO binding in nitrite reductase from Pseudomonas aeruginosa

Biochemistry
D NurizzoM Tegoni

Abstract

Nitrite reductase (NiR) from Pseudomonas aeruginosa (EC 1.9.3.2) (NiR-Pa) is a soluble enzyme catalyzing the reduction of nitrite (NO2-) to nitric oxide (NO). The enzyme is a 120 kDa homodimer, in which each monomer carries one c and one d1 heme. The oxidized and reduced forms of NiR from Paracoccus denitrificans GB17 (previously called Thiosphaera pantotropha) (NiR-Pd) have been described [Fülop, V., et al. (1995) Cell 81, 369-377; Williams, P. A., et al. (1997) Nature 389, 406-412], and we recently reported on the structure of oxidized NiR-Pa at 2.15 A [Nurizzo, D., et al. (1997) Structure 5, 1157-1171]. Although the domains carrying the d1 heme are almost identical in both NiR-Pa and NiR-Pd oxidized and reduced structures, the c heme domains show a different pattern of c heme coordination, depending on the species and the redox state. The sixth d1 heme ligand in oxidized NiR-Pd was found to be Tyr25, whereas in NiR-Pa, the homologuous Tyr10 does not interact directly with Fe3+, but via a hydroxide ion. Furthermore, upon reduction, the axial ligand of the c heme of NiR-Pd changes from His17 to Met108. Finally, in the oxidized NiR-Pa structure, the N-terminal stretch of residues (1-29) of one monomer interacts with the other m...Continue Reading

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