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Identification of amino acid residues that are crucial for FXIII-A intersubunit interactions and stability.

Abstract：

:Coagulation factor XIII (FXIII) is the main stabilizer of the fibrin clot. It circulates in plasma as a tetramer of two A-subunits and two B-subunits. Under physiological conditions, FXIII-A exists as a dimer (FXIII-A2). The interactions between the FXIII-A-subunits that stabilize the FXIII-A2 dimer are not fully understood. We therefore designed a systematic approach to identify amino acid residues crucial for the expression and stability of FXIII-A2. Based on the available FXIII-A2 crystal structure, we identified 12 amino acid residues forming intersubunit salt bridges and 21 amino acid residues forming hydrogen bonds between the two A-subunits. We chose 10 amino acid residues that form 5 particularly strong interactions, performed site-directed mutagenesis, and expressed the mutants in CHO cells. Disruption of these interactions by single mutation of Lys257, Lys113, Asp343, Glu401, or Asp404 abolished the expression of properly folded, soluble, and functional FXIII-A in CHO cells. On the contrary, mutation of Glu111, Arg100, or Asn112 had no significant effect on FXIII-A expression. Our results suggest that 4 intersubunit interactions (Arg11-Asp343, Lys113-Asp367, Lys257-Glu401, and Arg260-Asp404) are essential for the stability of FXIII-A2. Our findings are supported by reported mutations at Lys257, Arg260, and Asp404 found in patients with congenital FXIII-A deficiency.

journal_name

Blood

journal_title

Blood

authors

Li B,Kohler HP,Schroeder V

doi

10.1182/blood.2019002127

subject

Has Abstract

pub_date

2020-01-09 00:00:00

pages

145-152

issue

2

eissn

0006-4971

issn

1528-0020

pii

422506

journal_volume

135

pub_type

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