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• W2002813720 abstract "While the transglutaminase activity is associated exclusively with the thrombin-cleaved a chains of plasma Factor XIII, there is little information regarding the role of the b-chains. The present investigations were undertaken to clarify the role of the b-chains during proteolytic activation of plasma factor XIII a-chains. The a-chains of platelet Factor XIII (a2) were extremely sensitive to alpha-thrombin proteolysis, especially in the presence of 5 mM EDTA, resulting in two major fragments with molecular masses 51 +/- 3 kDa and 19 +/- 4 kDa. Furthermore, fibrin enhanced the alpha-thrombin proteolysis of thrombin-cleaved platelet Factor XIII a-chains in presence of CaCl2 or EDTA, resulting in several peptide fragments with molecular masses from 51 +/- 3 kDa to 14 +/- 4 kDa. By contrast, thrombin-cleaved a-chains of plasma Factor XIII (a2b2) were not further degraded by alpha-thrombin in presence of 5 mM EDTA. Even in the combined presence of 5 mM EDTA and 0.1 mg/ml fibrin, alpha-thrombin proteolysis of plasma Factor XIIIa was limited to the formation of a 76 kDa fragment (= Factor XIIIa), a 51 +/- 3 kDa fragment and trace amounts of a 14 +/- 4 kDa species. Platelet Factor XIII proteolyzed by 500 nM alpha-thrombin in presence of 5 mM EDTA expressed less than 20% of enzymatic activity obtained when platelet Factor XIII was activated in presence of 5 mM CaCl2. In contrast, plasma Factor XIII activated by 500 nM apha-thrombin in presence of 5 mM EDTA expressed nearly 65% of original transglutaminase activity. Likewise, when plasma Factor XIII was proteolyzed by 100-1000 nM gamma-thrombin in presence of 5 mM CaCl2 or 5 mM EDTA, maximal transglutaminase activity was observed. However, when platelet Factor XIII was similarly treated with gamma-thrombin in presence of 5 mM EDTA, only one-half the original transglutaminase activity was obtained. The b-chains thus appear to mimic the function of Ca2+ in preserving transglutaminase activity of thrombin-cleaved a-chains. The b-chains of plasma Factor XIII were not degraded by either alpha- or gamma-thrombin treatment, in presence of 5 mM EDTA or 5 mM CaCl2. Both platelet and plasma Factor XIII a-chains were degraded by trypsin to fragments with molecular masses of 51 +/- 3 kDa and 19 +/- 4 kDa in presence of 5 mM CaCl2 and to fragments with molecular masses of 19 +/- 4 kDa and lower, in presence of 5 mM EDTA.(ABSTRACT TRUNCATED AT 400 WORDS)" @default.
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• W2002813720 date "1988-09-01" @default.
• W2002813720 modified "2023-10-14" @default.
• W2002813720 title "b-chains prevent the proteolytic inactivation of the a-chains of plasma factor XIII" @default.
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• W2002813720 doi "https://doi.org/10.1016/0304-4165(88)90082-7" @default.
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