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Abstract
The glycosylated component of tissue factor from human brain which totally retained
on Concanavalin A-Sepharose was isolated by a four step procedure. The final product
(6–7 S) exhibited an apparent molecular weight of approximately 45, 000 under reducing
conditions on SDS-gels corresponding with procoagulant activity of tissue factor after
detergent removal. The optimal ratio of lipid to protein in reconstituting tissue
factor activity was 500:1 (w/w) amounting to 240, 000 U/mg. Peptidase activity was
not detectable in the purified apoprotein or in the relipidated protein. The procoagulant
activity of tissue factor was dependent on Factor VII but not on Factors VIII or IX,
since in the absence of Factor VII clotting times were significantly prolonged. The
activity of the reconstituted tissue factor could be reduced by a factor of 15 upon
incubation with an antibody against the purified glycosylated apoprotein that was
raised in the rabbit. The IgG-fraction of the antiserum neutralized the procoagulant
activity of tissue factor in saline extracts from human brain and placenta in a time-
and concentration-dependent manner indicating common antigenic determinants on the
cofactor protein from both tissues.
Keywords
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Article info
Publication history
Accepted:
September 5,
1985
Received:
May 29,
1985
Identification
Copyright
© 1985 Published by Elsevier Inc.