Purification of the blood vessel ATP diphosphohydrolase, identification and localisation by immunological techniques.
Biochim Biophys Acta
; 1334(1): 73-88, 1997 Feb 11.
Article
en En
| MEDLINE
| ID: mdl-9042368
ABSTRACT
ATP diphosphohydrolase (ATPDase) or apyrase (EC 3.6.1.5), an enzyme that hydrolyses the gamma and beta phosphate residues of triphospho- and diphosphonucleosides, has been purified from the bovine aorta media. A particulate fraction was isolated by differential, and sucrose cushion centrifugations, producing a 33-fold enrichment in ADPase activity. Solubilization of the enzyme from the particulate fraction with Triton X-100 caused a partial loss of activity. The solubilized enzyme was purified by DEAE-agarose, Affi-Gel blue and Concanavalin A column chromatographies yielding an additional 138-fold enrichment of the enzyme. The enzyme preparation was further purified by PAGE under non-denaturing conditions, followed by its detection on the gel. The active band was cut out and separated by SDS/PAGE. Overstaining with silver nitrate revealed a single band corresponding to a molecular mass of 78000. Presence of an ATP binding site on the latter protein was demonstrated by labelling with 5'-p-fluorosulfonylbenzoyladenosine (FSBA), an analogue of ATP, followed by its detection by a Western blot technique. Labelling specificity was demonstrated by competition experiments with Ca-ATP and Ca-ADP. An antiserum directed against the N-terminal sequence of the pig pancreas ATPDase (54 kDa) cross-reacted with the bovine aorta ATPDase at 78 kDa. Digestion of the ATPDase with N-glycosidase F caused a marked shift of the molecular mass, thereby showing multiple N-oligosaccharide chains. Immunohistochemical localisation confirmed the presence of ATPDase on both endothelial and smooth muscle cells.
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Colección:
01-internacional
Banco de datos:
MEDLINE
Asunto principal:
Aorta
/
Apirasa
/
Glicoproteínas
Tipo de estudio:
Diagnostic_studies
Límite:
Animals
Idioma:
En
Revista:
Biochim Biophys Acta
Año:
1997
Tipo del documento:
Article
País de afiliación:
Canadá