Here we report the structural and functional characterization of a covalent complex (MKP) obtained by cross-linking microperoxidase (Mp), the haem-undecapeptide obtained by the peptic digestion of cytochrome c, with a 21-residue synthetic peptide(P21) analogous to the S-peptide of the RNase A. The covalent complex has been prepared by introducing a disulphide bond between Cys-1 of P21 and Lys-13 of Mp, previously modified with a thiol-containing reagent. On formation of the complex (which is a monomer), the helical content of P21 increases significantly. The results obtained indicate that His-13 of P21 coordinates to the sixth co-ordination position of the haem iron, thus leading to the formation of a complex characterized by an equilibrium between an 'open' and a 'closed' structure, as confirmed by molecular dynamics simulations. Under acidic pH conditions, where His-13 of P21 is loosely bound to the haem iron ('open'conformation), MKP displays appreciable, quasireversible electrochemical activity; in contrast, at neutral pH ('closed' conformation) electrochemical behaviour is negligible, indicating that P21 interferes with the electron-transfer properties typical of Mp. On the whole, MKPis a suitable starting material for building a miniature haem system, with interesting potential for application to biosensor technology.
Ippoliti R., P.A. (1997). Covalent complex of microperoxidase with a 21-residue synthetic peptide as a maquette for low-molecular-mass redox proteins. BIOCHEMICAL JOURNAL, 328(3), 833-840.
Tipologia: | Articolo su rivista |
Citazione: | Ippoliti R., P.A. (1997). Covalent complex of microperoxidase with a 21-residue synthetic peptide as a maquette for low-molecular-mass redox proteins. BIOCHEMICAL JOURNAL, 328(3), 833-840. |
IF: | Con Impact Factor ISI |
Lingua: | English |
Settore Scientifico Disciplinare: | Settore BIO/10 |
Revisione (peer review): | Sì, ma tipo non specificato |
Tipo: | Articolo |
Rilevanza: | Rilevanza internazionale |
Stato di pubblicazione: | Pubblicato |
Data di pubblicazione: | 1997 |
Titolo: | Covalent complex of microperoxidase with a 21-residue synthetic peptide as a maquette for low-molecular-mass redox proteins |
Autori: | |
Autori: | Ippoliti R., Picciau A., Santucci R., Antonini G., Brunori M., Ranghino G. |
Appare nelle tipologie: | 01 - Articolo su rivista |