EPR characterization of the heme domain of a self-sufficient cytochrome P450 (CYP116B5)

Famulari, Antonino (Universidad de Zaragoza) ; Correddu, Danilo ; Di Nardo, Giovanna ; Gilardi, Gianfranco ; Chiesa, Mario ; García-Rubio, Inés (Universidad de Zaragoza)

Resumen: CYP116B5 is a self-sufficient cytochrome P450 (CYP450) with interesting catalytic properties for synthetic purposes. When isolated, its heme domain can act as a peroxygenase on different substrates of biotechnological interest. Here, by means of continuous wave and advanced EPR techniques, the coordination environment of iron in the isolated CYP116B5 heme domain (CYP116b5hd) is characterized. The ligand-free protein shows the characteristic EPR spectrum of a low-spin (S = 1/2) FeIII-heme with gz = 2.440 ± 0.005, gy = 2.25 ± 0.01, gx = 1.92 ± 0.01]. These g-values reflect an electronic ground state very similar to classical P450 monooxygenases rather than P450 peroxygenases. Binding of imidazole results in g-values very close to the ones reported for CYP152 peroxygenases. The detection of hyperfine interactions through HYperfine Sub-level CORrElation (HYSCORE) Spectroscopy experiments, shows that this is due to a nitrogen-mediated axial coordination. This work adds a piece of experimental evidence to the research, aimed at elucidating the features that distinguish the classical P450 enzymes from peroxygenases. It shows that the electronic environment of heme iron of CYP116B5 in the resting state is similar to the classical P450 monooxygenases. Therefore, it is not the critical factor that confers to CYP116B5hd its peroxygenase-like activity, suggesting a crucial role of the protein matrix. © 2022 The Authors

Idioma: Inglés

DOI: 10.1016/j.jinorgbio.2022.111785

Año: 2022

Publicado en: Journal of Inorganic Biochemistry 231 (2022), 111785 [5 pp.]
ISSN: 0162-0134

Factor impacto JCR: 3.9 (2022)

Categ. JCR: CHEMISTRY, INORGANIC & NUCLEAR rank: 8 / 42 = 0.19 (2022) - Q1 - T1
Categ. JCR: BIOCHEMISTRY & MOLECULAR BIOLOGY rank: 126 / 285 = 0.442 (2022) - Q2 - T2

Factor impacto CITESCORE: 7.0 - Chemistry (Q1) - Biochemistry, Genetics and Molecular Biology (Q2)

Factor impacto SCIMAGO: 0.646 - Inorganic Chemistry (Q1) - Biochemistry (Q2)

Financiación: info:eu-repo/grantAgreement/ES/DGA-FEDER/E35-20R
Financiación: info:eu-repo/grantAgreement/EC/H2020/813209/EU/Paramagnetic Species in Catalysis Research. A Unified Approach Towards Heterogeneous, Homogeneous and Enzyme Catalysis/PARACAT

Tipo y forma: Congress (Published version)

Área (Departamento): Área Física Materia Condensada (Dpto. Física Materia Condensa.)