Cytochrome P460 Cofactor Maturation Proceeds via Peroxide-Dependent Post-translational Modification.
Bollmeyer, M.M., Coleman, R.E., Majer, S.H., Ferrao, S.D., Lancaster, K.M.(2023) J Am Chem Soc 145: 14404-14416
- PubMed: 37338957 
- DOI: https://doi.org/10.1021/jacs.3c03608
- Primary Citation of Related Structures:  
8GAR - PubMed Abstract: 
Cytochrome P460s are heme enzymes that oxidize hydroxylamine to nitrous oxide. They bear specialized "heme P460" cofactors that are cross-linked to their host polypeptides by a post-translationally modified lysine residue. Wild-type N. europaea cytochrome P460 may be isolated as a cross-link-deficient proenzyme following anaerobic overexpression in E. coli . When treated with peroxide, this proenzyme undergoes maturation to active enzyme with spectroscopic and catalytic properties that match wild-type cyt P460. This maturation reactivity requires no chaperones─it is intrinsic to the protein. This behavior extends to the broader cytochrome c' β superfamily. Accumulated data reveal key contributions from the secondary coordination sphere that enable selective, complete maturation. Spectroscopic data support the intermediacy of a ferryl species along the maturation pathway.
Organizational Affiliation: 
Department of Chemistry and Chemical Biology, Baker Laboratory, Cornell University, 162 Sciences Drive, Ithaca, New York 14853, United States.