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Identification of a new mutation (Gly420Ser), distal to the active site, that leads to factor XIII deficiency.

Abstract：

:The molecular defects of the factor XIII A subunit gene were studied in a patient with factor XIII deficiency. Mutation analysis was performed on amplified DNA from each exon of this gene by single-strand conformation polymorphism (SSCP) and DNA sequencing techniques. A substitution of guanine by adenine at nucleotide 1258 in exon 10 of the coagulation factor XIII A subunit gene has been identified in the patient. The mutation results in the replacement of Gly420 by Ser in the core domain of the enzyme. Restriction enzyme analysis of amplified exon 10 DNA confirmed that the patient was homozygous for this mutation. A family study revealed that the mutation was inherited from both parents, who were first cousins. The potential effects of the mutation were predicted by molecular modeling of the amino acid substitution within the coordinates of the crystal structure. The substitution occurred within the core domain of the enzyme at a residue completely conserved among all known members of the transglutaminase family. The model of the mutant protein suggests that although the substitution of Gly420 by Ser causes only minor readjustment of the residues and does not appear to be particularly deleterious in terms of structure, the mutation is, however, likely to decrease the molecule's ability to undergo the conformational change that is thought to be required for full transglutaminase activity. Our data strongly support the previously published information about the functional significance of the residues surrounding, but not forming, the catalytic pocket in the A subunit of factor XIII.

journal_name

Eur J Haematol

journal_title

European journal of haematology

authors

Kangsadalampai S,Yenchitsomanus P,Chelvanayagam G,Sawasdee N,Laosombat V,Board P

doi

10.1034/j.1600-0609.2000.065004279.x

subject

Has Abstract

pub_date

2000-10-01 00:00:00

pages

279-84

issue

4

eissn

0902-4441

issn

1600-0609

journal_volume

65

pub_type

杂志文章

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