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Absence of conformational change in complement factor 3 and factor XII adsorbed to acrylate polymers is related to a high degree of polymer backbone flexibility

Journal article
Authors K. Fromell
Yi Yang
K. N. Ekdahl
B. Nilsson
Mattias Berglin
Hans-Björne Elwing
Published in Biointerphases
Volume 12
Issue 2
ISSN 1934-8630
Publication year 2017
Published at Department of Chemistry and Molecular Biology
Language en
Links dx.doi.org/10.1116/1.4985698
https://gup.ub.gu.se/file/207005
Keywords SELF-ASSEMBLED MONOLAYERS, PROTEIN ADSORPTION, SURFACE HYDROPHOBICITY, FIBRINOGEN ADSORPTION, MONOCLONAL-ANTIBODIES, IMMOBILIZED HEPARIN, ACTIVATION, INTERFACE, SYSTEM
Subject categories Chemical Sciences

Abstract

In previous investigations, the authors have examined the adsorption of albumin, immunoglobulin, and fibrinogen to a series of acrylate polymers with different backbone and side-group flexibility. The authors showed that protein adsorption to acrylates with high flexibility, such as poly(lauryl methacrylate) (PLMA), tends to preserve native conformation. In the present study, the authors have continued this work by examining the conformational changes that occur during the binding of complement factor 3 (C3) and coagulation factor XII (FXII). Native C3 adsorbed readily to all solid surfaces tested, including a series of acrylate surfaces of varying backbone flexibility. However, a monoclonal antibody recognizing a "hidden" epitope of C3 (only exposed during C3 activation or denaturation) bound to the C3 on the rigid acrylate surfaces or on polystyrene (also rigid), but not to C3 on the flexible PLMA, indicating that varying degrees of conformational change had occurred with binding to different surfaces. Similarly, FXII was activated only on the rigid poly(butyl methacrylate) surface, as assessed by the formation of FXIIa-antithrombin (AT) complexes; in contrast, it remained in its native form on the flexible PLMA surface. The authors also found that water wettability hysteresis, defined as the difference between the advancing and receding contact angles, was highest for the PLMA surface, indicating that a dynamic change in the interface polymer structure may help protect the adsorbed protein from conformational changes and denaturation. (C) 2017 Author(s).

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