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Purification and characterisation of recombinant His-tagged RgpB gingipain from Porphymonas gingivalis

  • Florian Veillard EMAIL logo , Barbara Potempa , Yonghua Guo , Miroslaw Ksiazek , Maryta N. Sztukowska , John A. Houston , Lahari Koneru , Ky-Anh Nguyen EMAIL logo and Jan Potempa EMAIL logo
Published/Copyright: February 4, 2015

Abstract

Gingipain proteases are important virulence factors from the periodontal pathogen Porphyromonas gingivalis and are the target of many in vitro studies. Due to their close biochemical properties, purification of individual gingipains is difficult and requires multiple chromatographic steps. In this study, we demonstrate that insertion of a hexahistidine affinity tag upstream of a C-terminal outer membrane translocation signal in RgpB gingipain leads to the secretion of a soluble, mature form of RgpB bearing the affinity tag that can easily be purified by nickel-chelating affinity chromatography. The final product obtained high yielding high purity is biochemically indistinguishable from the native RgpB enzyme.


Corresponding authors: Florian Veillard, Department of Oral Immunology and Infectious Diseases, University of Louisville School of Dentistry, Louisville, KY 40202, USA, e-mail: ; and Ky-Anh Nguyen, Institute of Dental Research, Westmead Centre for Oral Health and Westmead Millenium Institute, Sydney, NSW 2145, Australia; and Faculty of Dentistry, University of Sydney, Sydney, NSW 2006, Australia, e-mail: ; and Jan Potempa, Department of Oral Immunology and Infectious Diseases, University of Louisville School of Dentistry, Louisville, KY 40202, USA; and Faculty of Biochemistry, Department of Microbiology, Biophysics and Biotechnology and Malopolska Centre of Biotechnology (MCB), Jagiellonian University, 30-387 Krakow, Poland, e-mail:
aPresent address: IBMC, UPR9022 CNRS, F-37000 Strasbourg, France.bThese authors contributed equally to this study and share first authorship.

Acknowledgments

This study was supported by grants from Polish National Science Centre, Poland (2012/04/A/NZ1/00051), US NIH (DE 09761 and DE 022597), the European Commission (FP7-PEOPLE-2011-ITN-290246 ‘RAPID’ and FP7-HEALTH-F3-2012-306029 ‘TRIGGER’), and the Polish Ministry of Science and Higher Education (UMO-2795/7.PR/13/2017/2). MK obtained a doctoral scholarship (2013/08/T/NZ1/00315) from National Science Centre, Poland. The Faculty of Biochemistry, Biophysics and Biotechnology is a partner of the Leading National Research Center (KNOW) supported by the Ministry of Science and Higher Education.

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Received: 2014-12-9
Accepted: 2015-2-2
Published Online: 2015-2-4
Published in Print: 2015-4-1

©2015 by De Gruyter

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