Replacement of the Y450 (c234) phenyl ring in the carboxyl-terminal region of coagulation factor IX causes pleiotropic effects on secretion and enzyme activity |
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| Authors: | Alessio Branchini Matteo Campioni Maria Gabriella Mazzucconi Francesca Biondo Rosella Mari Maria Patrizia Bicocchi Francesco Bernardi Mirko Pinotti |
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| Institution: | 1. Department of Life Sciences and Biotechnology and LTTA Center, University of Ferrara, Ferrara, Italy;2. University of Rome “La Sapienza”, Umberto I Hospital, Roma, Italy;3. Department of Cellular Biotechnology and Haematology, University La Sapienza, Roma, Italy;4. Haemostasis & Thrombosis Center, University of Ferrara, Ferrara, Italy;5. Haemophilia & Thrombosis Centre, G. Gaslini Institute, Genova, Italy |
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| Abstract: | The interplay between impaired protein biosynthesis and/or function caused by missense mutations, particularly in relation to specific protein regions, has been poorly investigated. As model we chose the severe p.Y450C mutation in the carboxyl-terminal region of coagulation factor IX (FIX) and, by expression of a panel of recombinant variants, demonstrated the key role of the tyrosine phenyl group for both FIX secretion and coagulant activity. Comparison among highly homologous coagulation serine proteases indicate that additive or compensatory pleiotropic effects on secretion and function by carboxyl-terminal mutations produce life-threatening or mild phenotypes in the presence of similarly reduced protein amounts. |
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| Keywords: | Missense mutations Carboxyl-terminal region Impaired secretion Dysfunctional enzyme Gene expression Coagulation factor IX |
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