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Westrup, Dagmar; Santoso, Sentot; Follert-Hagendorff, Katja; Bassus, Steffen; Just, Melitta; Jablonka, Bernd; Kirchmaier, Carl M
Thrombosis and haemostasis 92, Številka: 5Journal Article
In this study, we report on the characterization of a patient with Glanzmann thrombasthenia (GT). Immunochemical analysis on platelets from the patient showed that the expression of alpha IIb beta 3 was only 25% of that in normal healthy controls, suggesting a case of GT. Functional analysis revealed a total lack of fibrinogen binding capacity. Molecular genetic analysis of the full-length cDNA sequences of alpha IIb and beta 3 subunits showed a novel point mutation C621T in alpha IIb cDNA, leading to a missense substitution of threonine for isoleucine at position 176. Coexpression of normal beta 3 and mutant alpha IIb(1176) isoform in mammalian cells showed a marked reduction in the expression of alpha IIb beta 3 heterodimer when compared to the wild-type and a decreased intracellular level of alpha IIb. The T176 I mutation is located in the N-terminal region in the W3:1-2 connecting strand of the beta-propeller. These data suggest that the N-terminal alpha IIb domain plays an important structural role in the formation of heterodimer and that it is also involved in fibrinogen binding.
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