Oxidation of cysteine by ceruloplasmin leads to formation of hydrogen peroxide, which can be utilized by myeloperoxidase.
Biochem Biophys Res Commun
; 503(3): 2146-2151, 2018 09 10.
Article
en En
| MEDLINE
| ID: mdl-30082031
ABSTRACT
Myeloperoxidase (MPO) is the enzyme of azurophilic granules of neutrophils, which catalyzes two electron oxidation of either chloride or bromide in the so-called "halogenating cycle". Interaction of hydrogen peroxide with MPO in the presence of chloride ions leads to formation of hypochlorous acid (HOCl). Ceruloplasmin (CP) is known to be an effective physiological inhibitor of the MPO activity. However, despite the large excess of CP in blood plasma, MPO-dependently modified biomolecules were found in variety of inflammation loci, including vessel walls. This study shows that CP, which is supposed to inhibit MPO, can provide its action in physiological conditions due to hydrogen peroxide formation during oxidation of free cysteine. The key role of labile copper ions in said process is also demonstrated.
Palabras clave
Texto completo:
1
Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Ceruloplasmina
/
Peroxidasa
/
Cisteína
/
Peróxido de Hidrógeno
Límite:
Humans
Idioma:
En
Revista:
Biochem Biophys Res Commun
Año:
2018
Tipo del documento:
Article