Journal of Thrombosis and Thrombolysis

, Volume 48, Issue 1, pp 95–102 | Cite as

Exploring the structural similarity yet functional distinction between coagulation factor XIII-B and complement factor H sushi domains

  • Mohammad Suhail Akhter
  • Sneha Singh
  • Hamideh Yadegari
  • Vytautas Ivaskevicius
  • Johannes Oldenburg
  • Arijit BiswasEmail author


Coagulation factor XIII (FXIII) covalently crosslinks pre-formed fibrin clots preventing their premature fibrinolysis. In plasma, FXIII circulates as a zymogenic heterotetramer composed of catalytic FXIII-A subunits, and carrier/regulatory FXIII-B subunits. FXIII-A is a well characterized component of this complex, and has been associated with several pleiotropic roles outside coagulation as well. In comparison only protective/regulatory roles towards the FXIII-A subunit have been identified for FXIII-B. Strong homology between FXIII-B and complement regulator Complement factor H suggests a putative role of FXIII-B in complement activation. In the current study we have analyzed the similarities and yet functional divergence of these two proteins using in silico sequence alignment and structural analysis. We have evaluated complement activation post reconstitution of FXIII components into FXIII deficient and CFH deficient plasma. We have also transiently expressed FXIII-B in SH-SY5Y cell lines and evaluated its effect on the endogenous complement activation. Our investigations show no effect of FXIII-B subunit on the rate of complement activation. Therefore we conclude that at a physiological level, FXIII-B subunit plays no role in the complement system, although a vestigial function in altered pathological states might still exist.


Factor XIII Factor XIIIb Complement system proteins Complement factor h 


Author contributions

AB and JO are the principle investigators of the study. MSA and SS performed the laboratory experiments. MSA, SS and AB analyzed the data, generated the images and co-wrote the article. AB, HY, VI and JO edited and revised the article. AB designed the study. None of the authors have any conflict of interest in the following work. The authors would like to acknowledge technical help from Sophie Lyonga.

Compliance with ethical standards

Conflict of interest

Authors declare no conflict of interest.

Ethical approval

This article does not contain any studies with animals performed by any of the authors.

Supplementary material

11239_2019_1841_MOESM1_ESM.docx (172 kb)
Supplementary material 1 (DOCX 171 KB)


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© Springer Science+Business Media, LLC, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Institute of Experimental Haematology and Transfusion MedicineUniversity Clinic BonnBonnGermany
  2. 2.College of Applied Medical SciencesJazan UniversityJazanSaudi Arabia

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