journal article Aug 28, 2019

Proteolytic and nonproteolytic activation mechanisms result in conformationally and functionally different forms of coagulation factor XIII A

The FEBS Journal Vol. 287 No. 3 pp. 452-464 · Wiley
View at Publisher Save 10.1111/febs.15040
Abstract
Factor XIIIA (FXIIIA) is a transglutaminase that cross‐links intra‐ and extracellular protein substrates. FXIIIA is expressed as an inactive zymogen, and during blood coagulation, it is activated by removal of an activation peptide by the protease thrombin. No such proteolytic FXIIIA activation is known to occur in other tissues or the intracellular form of FXIIIA. For those locations, FXIIIA is assumed instead to undergo activation by Ca2+ ions. Previously, we demonstrated a monomeric state for active FXIIIA. Current analytical ultracentrifugation and kinetic experiments revealed that thrombin‐activated FXIIIA has a higher conformational flexibility and a stronger affinity toward glutamine substrate than does nonproteolytically activated FXIIIA. The proteolytic activation of FXIIIA was further investigated in a context of fibrin clotting. In a series of fibrin cross‐linking assays and scanning electron microscopy studies of plasma clots, the activation rates of FXIIIA V34X variants were correlated with the extent of fibrin cross‐linking and incorporation of nonfibrous protein into the clot. Overall, the results suggest conformational and functional differences between active FXIIIA forms, thus expanding the understanding of FXIIIA function. Those differences may serve as a basis for developing therapeutic strategies to target FXIIIA in different physiological environments.EnzymesFactor XIIIA ( EC 2.3.2.13)
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References
55
[28]
Modern analytical ultracentrifugation in protein science: A tutorial review

Jacob Lebowitz, Marc S. Lewis, Peter Schuck

Protein Science 10.1110/ps.0207702
[30]
Jadhav MA "Screening cleavage of Factor XIII V34X Activation Peptides by thrombin mutants: a strategy for controlling fibrin architecture" Biochem Biophys Acta (2017)

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Details
Published
Aug 28, 2019
Vol/Issue
287(3)
Pages
452-464
License
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Funding
National Institutes of Health Award: R01 CA211098
British Heart Foundation Award: PG/08/052/25172
Cite This Article
Boris A. Anokhin, William L. Dean, Kerrie A. Smith, et al. (2019). Proteolytic and nonproteolytic activation mechanisms result in conformationally and functionally different forms of coagulation factor XIII A. The FEBS Journal, 287(3), 452-464. https://doi.org/10.1111/febs.15040
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