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Role of the complement factor H-related protein 5 in renal disease by protein expression and molecular solution structural studies

Kadkhodayi-Kholghi, Nilufar; (2018) Role of the complement factor H-related protein 5 in renal disease by protein expression and molecular solution structural studies. Doctoral thesis (Ph.D), UCL (University College London).

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Abstract

Complement Factor H-Related 5 (CFHR5) belongs to the same complement family as the major regulator Factor H. CFHR5 comprises nine short complement regulator (SCR) domains. The duplication of the N-terminal SCR-1/2 domains causes CFHR5 nephropathy, a cause of kidney failure in Cypriots. To clarify the molecular basis of CFHR5 nephropathy, E. coli expression systems were developed for SCR-1 and SCR-1/2 of CFHR5, and recombinant CFHR5 SCR-1/9 was obtained from a commercial mammalian expression system. First, the domain arrangement of CFHR5 SCR-1/9 was studied by analytical ultracentrifugation and X-ray scattering. Sedimentation velocity reported a molecular mass of 134 kDa, indicating that CFHR5 is dimeric. The CFHR5 sedimentation coefficient of 5-6 S decreased with increased NaCl, showing that this became more extended. X-ray scattering also showed that CFHR5 was dimeric. The X-ray mean radius of gyration RG was 5.5 ± 0.2 nm, and its maximum length was 20 nm. This length is low compared to that of 32 nm for monomeric Factor H with 20 SCR domains, indicating that CFHR5 possessed a more compact SCR arrangement than that of Factor H. Atomistic scattering curve modelling of CFHR5 that involved Monte Carlo simulations to generate physically realistic atomistic SCR structures showed that CFHR5 possessed a folded-back compact domain structure. Second, sedimentation velocity showed that SCR-1 was monomeric, while SCR-1/2 was dimeric, thus locating a CFHR5 dimerization site to its N-terminus. In summary, the solution structure of CFHR5 is markedly more compact than previously thought, and its dimerization site was located to SCR-1/2. The perturbation of SCR-1/2 may have a major role in causing CFHR5 nephropathy.

Type: Thesis (Doctoral)
Qualification: Ph.D
Title: Role of the complement factor H-related protein 5 in renal disease by protein expression and molecular solution structural studies
Event: UCL (University College London)
Language: English
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Life Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Life Sciences > Div of Biosciences
URI: https://discovery.ucl.ac.uk/id/eprint/10041614
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