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Structural interpretation of 42 mutations causing factor XI deficiency using homology modeling.
N M O'Connell1, R E Saunders, C A Lee
1The Katharine Dormandy Haemophilia Center and Haemostasis Unit, The Royal Free & University College Medical School, London, UK.
Journal of Thrombosis and Haemostasis : JTH
|January 7, 2005
Summary
Molecular models reveal that protein misfolding is a key mechanism in Factor XI (FXI) deficiency. These models help characterize new FXI mutations and understand their impact on blood coagulation.
Area of Science:
- Biochemistry
- Molecular Biology
- Hematology
Background:
- Factor XI (FXI) plays a critical role in the consolidation phase of blood coagulation.
- Structural insights into FXI mutations causing deficiency have been limited due to the absence of a defined FXI structure.
Purpose of the Study:
- To develop molecular models of the apple (Ap) and serine protease (SP) domains of FXI.
- To structurally assess the effects of published FXI mutations and correlate them with observed phenotypes.
Main Methods:
- Homology modeling was employed for the Ap domains using an NMR structure of an adhesin.
- The SP domain was modeled using the crystal structure of beta-tryptase.
Main Results:
- Analysis of 42 mutations causing FXI deficiency using homology models.
- Protein misfolding identified as a likely mechanism for Type I FXI deficiency in both Ap and SP domains.
- Structural analysis of Type II mutations suggests disruption of substrate/cofactor binding or active site integrity.
Conclusions:
- The developed molecular models enable structural characterization of novel FXI mutations.
- These models complement phenotypic data and guide the design of expression studies to elucidate molecular mechanisms of FXI deficiency.