Evaluation of the specific dicyclohexylcarbodiimide binding sites in brown adipose tissue mitochondria.
Biochim Biophys Acta
; 634(2): 321-30, 1981 Feb 12.
Article
en En
| MEDLINE
| ID: mdl-6451241
ABSTRACT
1. The content of the membrane sector of the ATPase complex (Fo) in brown adipose tissue mitochondria was determined by means of specific [14C]-DCCD binding. 2. The specific DCCD binding to the F0 protein was distinguished from the nonspecific binding to the other membrane proteins and phospholipids by (a) Scatchard plot analysis of the equilibrium binding data, (b) SDS-polyacrylamide gel electrophoresis of the 14C-labelled membrane proteins, (c) partial purification of the chloroform-methanol extractable DCCD-binding protein. It was found that the specific DCCD binding was present in three polypeptides of a relative molecular weight of 9000, 16 000 and 32 000. In brown adipose tissue mitochondria the specific binding was 10-times lower than in heart or liver mitochondria. The binding to the other membrane proteins and to phospholipids was quite similar in all mitochondrial preparations studied. 3. The decreased quantity of the specific binding sites in brown adipose tissue mitochondria demonstrated that the reduction of F0 parallels the reduction of the F1-ATPase and revealed that in these mitochondrial membranes the ratio between the respiratory chain enzymes and the ATPase complex is 10- to 20- times higher than in heart or liver mitochondria.
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Colección:
01-internacional
Banco de datos:
MEDLINE
Asunto principal:
Tejido Adiposo Pardo
/
Carbodiimidas
/
Proteínas Portadoras
/
Tejido Adiposo
/
Adenosina Trifosfatasas
/
Diciclohexilcarbodiimida
Límite:
Animals
Idioma:
En
Revista:
Biochim Biophys Acta
Año:
1981
Tipo del documento:
Article