Studies on the heme and H2-uptake reaction from Azotobacter vinelandii bacterial ferritin.
Bioelectrochem Bioenerg
; 48(1): 87-93, 1999 Feb.
Article
en En
| MEDLINE
| ID: mdl-10228574
ABSTRACT
Bacterial ferritin of Azotobacter vinelandii (AvBF) is directly able to pick electrons up for iron release from or transfer them for storage to a platinum electrode in the absence of mediator or other reducer. The ferritin containing the structure of heme-Co2+ in part shows weakened activity to electrode and decreases the rate of iron release greatly. A reversible reduction process of the ferritin is observed by the spectral change regularly ranging from 310 to 260 nm under mixed gases containing 98% H2 and 2% to O2. The activity of nitrogen fixation from the whole cell of A. vinelandii increases greatly by H2 reduction with potentials ranging from -397 to -425 mV vs. NHE, indicating two important roles of H2-uptake reaction of the ferritin in increasing activity of nitrogen fixation and in supplying iron to synthesize nitrogenase.
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Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Azotobacter vinelandii
/
Ferritinas
/
Hemo
/
Hidrógeno
Idioma:
En
Revista:
Bioelectrochem Bioenerg
Asunto de la revista:
BIOQUIMICA
Año:
1999
Tipo del documento:
Article
País de afiliación:
China