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The molecular basis of type I or III Protein S deficiency has been investigated in three kindred also showing independent inheritance of factor V (FV) Leiden. A T to C transition in codon 570 (Met-->Thr) was identified in the propositi and shown to segregate with protein S deficiency in all but one
Protein S deficiency (PSD) has been the most difficult to study among the classical inherited thrombophilic factors. This is in part due to the peculiar biology of protein S (PS), which has an anticoagulant role but no enzymatic activity, and because it interacts with plasma components that function
Protein S is a vitamin K-dependent plasma glycoprotein circulating in plasma at a concentration of around 350 nM. Approximately 60% of protein S in human plasma is bound to the complement regulatory protein C4b-binding protein (C4BP) in a high-affinity, high-molecular-weight complex. Protein S in