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Clinical and biochemical characterization of antithrombin III Franconville, a variant with Pro 41 Leu mutation.

Abstract：

:We describe a familial study of AT III, a type III antithrombin III variant which was identified in the propositus by gene analysis as Pro 41 Leu heterozygous mutation. None of the four members of the family who presented with defective heparin cofactor (hep-cofactor) activity, and therefore probably carried the mutation, had experienced deep venous thrombosis. The abnormal AT III was purified from the propositus' plasma, taking advantage of the difference in NaCl concentrations required to elute variant and normal AT III from heparin-Sepharose. The antithrombin and anti-Xa activities of the purified variant AT III were comparable to those observed for normal AT III, but hep-cofactor activity was strikingly reduced. The enhancement by heparin of thrombin and F Xa inhibition by normal and variant AT III was compared in the absence of NaCl and in the presence of normal NaCl concentrations. The difference between the degrees of inhibition by normal and variant AT III was maximal at physiological ionic strength (i.e. at a concentration of 0.15 M). The quantification of heparin AT III interaction with both normal and variant purified proteins in a double reciprocal plot yielded similar dissociation constants but a 9-fold decrease in the maximal pseudo-first order constant. This suggests that Pro 41 is more involved in the molecular changes induced by heparin than in the primary binding of the activator.

journal_name

Br J Haematol

journal_title

British journal of haematology

authors

de Roux N,Chadeuf G,Molho-Sabatier P,Plouin PF,Aiach M

doi

10.1111/j.1365-2141.1990.tb02653.x

subject

Has Abstract

pub_date

1990-06-01 00:00:00

pages

222-7

issue

2

eissn

0007-1048

issn

1365-2141

journal_volume

75

pub_type

杂志文章

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