Incorporation of a molybdenum atom in a Rubredoxin-type Centre of a de novo-designed α3DIV-L21C three-helical bundle peptide

Bragança, Pedro M. S.; Carepo, Marta S. P.; Pauleta, Sofia R.; Pinter, Tyler; Elia, Maddalena; Cordas, Cristina M.; Moura, Isabel; Pecoraro, Vicent; Moura, José J. G.

http://hdl.handle.net/10362/157999

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Autores

Bragança, Pedro M. S.

Resumo(s)

The rational design and functionalization of small, simple, and stable peptides scaffolds is an attractive avenue to mimic catalytic metal-centres of complex proteins, relevant for the design of metalloenzymes with environmental, biotechnological and health impacts. The de novo designed α3DIV-L21C framework has a rubredoxin-like metal binding site and was used in this work to incorporate a Mo-atom. Thermostability studies using differential scanning calorimetry showed an increase of 4 °C in the melting temperature of the Mo-α3DIV-L21C when compared to the apo-α3DIV-L21C. Circular dichroism in the visible and far-UV regions corroborated these results showing that Mo incorporation provides stability to the peptide even though there were almost no differences observed in the secondary structure. A formal reduction potential of ∼ −408 mV vs. NHE, pH 7.6 was determined. Combining electrochemical results, EPR and UV–visible data we discuss the oxidation state of the molybdenum centre in Mo-α3DIV-L21C and propose that is mainly in a Mo (VI) oxidation state.

Descrição

PB would thank the PTNMRPhD (PD/00065/2013). VLP thanks the NIH for support (GM141086).

Palavras-chave

A de novo protein design Three-helix bundle Molybdenum Models of molybdenum-containing enzymes Rubredoxin Tetracysteinyl coordination SDG 13 - Climate Action SDG 15 - Life on Land