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Primary structure of human coagulation factor XIII
1Department of Biochemistry, University of Washington, Seattle 98195.
Advances in Experimental Medicine and Biology
|January 1, 1988
Summary
Researchers determined the primary structures of human factor XIII
Area of Science:
- Biochemistry
- Molecular Biology
- Genetics
Background:
- Human factor XIII is a crucial enzyme in blood coagulation.
- Understanding its subunit structure is vital for comprehending its function.
Purpose of the Study:
- To elucidate the complete primary structures of the alpha (a) and beta (b) subunits of human factor XIII.
- To identify key functional regions within each subunit.
Main Methods:
- Combined cDNA cloning and amino acid sequencing techniques.
- Analysis of amino acid composition and sequence homology.
Main Results:
- The a subunit (731 amino acids) contains an activation peptide, active site, calcium-binding site(s), and thrombin-inactivation site, with functional regions potentially in separate exons.
- The b subunit (641 amino acids) features ten tandem repeats homologous to other proteins, with GP-I structures likely encoded by separate exons.
Conclusions:
- The complete primary structures of human factor XIII's a and b subunits have been determined.
- Structural insights suggest a complex genetic organization and functional compartmentalization within the subunits.