The Identification and Synthesis of Activated Plasma Thromboplastin Component (ptc').
نویسندگان
چکیده
S THE NUMBER of known intrinsic clotting factors has increased, it has become clear that the final reaction, the conversion of fibrinogen to fibrin by thrombin, must result from a series of preliminary reactions, each probably involving only two clotting factors. This means that each clotting factor must circulate either as a precursor or as a highly specific molecule which only reacts with another factor which circulates as a precursor. The literature on plasma thromboplastin component ( PTC, factor IX, Christmas factor ) contains evidence that PTC belongs to the former category, i.e., that PTC is a molecule which is activated during intrinsic clotting, in vitro.19 We report herein the identification of an activated form of PTC ( PTC’) in barium sulfate eluates of citrated plasma. Data will also be presented demonstrating the synthesis of PTC’ from partially purified reagents. It will be shown ( 1 ) that the only clotting factors required are native PTC, the substrate, and activated plasma thromboplastin antecedent ( PTA’, activated factor XI ) , the enzyme, and ( 2 ) that ionic calcium accelerates but is not otherwise necessary for the reaction.
منابع مشابه
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ورودعنوان ژورنال:
- Blood
دوره 22 شماره
صفحات -
تاریخ انتشار 1963