منابع مشابه
Autoactivation of thrombin precursors.
Trypsin-like proteases are synthesized as inactive zymogens and convert to the mature form upon activation by specific enzymes, often assisted by cofactors. Central to this paradigm is that the zymogen does not convert spontaneously to the mature enzyme, which in turn does not feed back to activate its zymogen form. In the blood, the zymogens prothrombin and prethrombin-2 require the prothrombi...
متن کاملWEDGE: an anticoagulant thrombin mutant produced by autoactivation.
BACKGROUND The production of therapeutically relevant proteases typically involves activation of a zymogen precursor by external enzymes, which may raise regulatory issues about availability and purity. Recent studies of thrombin precursors have shown how to engineer constructs that spontaneously convert to the mature protease by autoactivation, without the need for external enzymes. OBJECTIV...
متن کاملThe autoactivation of trypsinogen.
The ability of trypsinogen to catalyze its own activation was studied at pH 8.1 in the presence of Ca++ ions. The lag phase portion of the classical S-shaped curve of activation was shortened by increasing the trypsinogen concentration but was extended by pretreatment of the zymogen with diisopropyl fluorophosphate or soybean trypsin inhibitor. Despite these pretreatments, however, full activat...
متن کاملAutoactivation of human plasma prekallikrein.
Incubation of purified human plasma prekallikrein with sulfatides or dextran sulfate resulted in spontaneous activation of prekallikrein as judged by the appearance of amidolytic activity toward the chromogenic substrate H-D-Pro-Phe-Arg-p-nitroanilide. The time course of generation of amidolytic activity was sigmoidal with an apparent lag phase that was followed by a relatively rapid activation...
متن کاملAccelerative autoactivation of prostaglandin biosynthesis by PGG2.
Received October 24, 1978 Summary : Cyclooxygenase catalysis is stimulated by its product, PGG2, and by other lipid hydroperoxides. The endoperoxide, PGH , was not stimulatory. The results provide a direct demonstration of an essen & ial role for lipid hydroperoxides in prostaglandin biosynthesis, and show how the biosynthetic intermediate PGG2 has a positive accelerative effect. INTRODUCTION A...
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ژورنال
عنوان ژورنال: Journal of Biological Chemistry
سال: 2013
ISSN: 0021-9258
DOI: 10.1074/jbc.m113.451542