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Identification and characterization of two missense mutations causing factor XIIIA deficiency
S Kangsadalampai1, G Chelvanayagam, R Baker
1Molecular Genetics Group, John Curtin School of Medical Research, Australian National University, Canberra.
British Journal of Haematology
|February 23, 1999
Summary
Two mutations in factor XIII (FXIII) subunits, Arg260His and Val414Phe, were studied. These genetic changes significantly impair FXIII enzyme activity and expression, impacting protein stability.
Area of Science:
- Biochemistry
- Molecular Biology
- Genetics
Background:
- Factor XIII (FXIII) is crucial for blood coagulation and wound healing.
- FXIII deficiency can lead to severe bleeding disorders.
- Understanding FXIII mutations is vital for diagnosing and treating deficiency.
Observation:
- Two specific amino acid substitutions (Arg260His, Val414Phe) were identified in FXIII-deficient patients.
- Mutant FXIII sequences were engineered and expressed in yeast.
- Enzyme activity, protein levels, and mRNA were analyzed.
Findings:
- Both Arg260His and Val414Phe mutations significantly reduced FXIII transglutaminase activity.
- Mutations decreased the overall expression level of the FXIII enzyme.
- Computer modeling indicated these mutations disrupt protein structure and stability, despite not directly affecting the active site.
Implications:
- Amino acid residues outside the active site can critically influence protein function and stability.
- These findings enhance the understanding of FXIII deficiency pathogenesis.
- This research provides insights into protein structure-function relationships relevant to enzyme engineering and therapeutic development.