Authors:
L. A. GanuelasSchool of Molecular Bioscience, The University of Sydney, Sydney, Australia

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N. LiSchool of Molecular Bioscience, The University of Sydney, Sydney, Australia

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P. YunInstitute of Dental Research, Westmead Millennium Institute and Centre for Oral Health, Westmead Hospital, Sydney, NSW, Australia

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N. HunterInstitute of Dental Research, Westmead Millennium Institute and Centre for Oral Health, Westmead Hospital, Sydney, NSW, Australia
Faculty of Dentistry, The University of Sydney, Sydney, Australia

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Charles A. CollyerSchool of Molecular Bioscience, The University of Sydney, Sydney, Australia

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Abstract

The crystal structure of the K1 domain, an adhesin module of the lysine gingipain (Kgp) expressed on the cell surface by the periodontopathic anaerobic bacterium, Porphyromonas gingivalis W83, is compared to the previously determined structures of homologues K2 and K3, all three being representative members of the cleaved adhesin domain family. In the structure of K1, the conformation of the most extensive surface loop is unexpectedly perturbed, perhaps by crystal packing, and is displaced from a previously reported arginine-anchored position observed in K2 and K3. This displacement allows the loop to become free to interact with other proteins; the alternate flipped-out loop conformation is a novel mechanism for interacting with target host proteins, other bacteria, or other gingipain protein domains. Further, the K1 adhesin module, like others, is found to be haemolytic in vitro, and so, functions in erythrocyte recognition thereby contributing to the haemolytic function of Kgp. K1 was also observed to selectively bind to haem-albumin with high affinity, suggesting this domain may be involved in gingipain-mediated haem acquisition from haem-albumin. Therefore, it is most likely that all cleaved adhesin domains of Kgp contribute to the pathogenicity of P. gingivalis in more complex ways than simply mediating bacterial adherence.

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Senior editors

Editor(s)-in-Chief: Dunay, Ildiko Rita

Editor(s)-in-Chief: Heimesaat, Markus M.

Vice Editor(s)-in-Chief: Fuchs, Anja

Editorial Board

Chair of the Editorial Board:
Jeffrey S. Buguliskis (Thomas Jefferson University, USA)

  • Jörn Albring (University of Münster, Germany)
  • Stefan Bereswill (Charité - University Medicine Berlin, Germany)
  • Dunja Bruder (University of Megdeburg, Germany)
  • Jan Buer (University of Duisburg, Germany)
  • Jeff Buguliskis (Thomas Jefferson University, USA)
  • Edit Buzas (Semmelweis University, Hungary)
  • Charles Collyer (University of Sydney, Australia)
  • Renato Damatta (UENF, Brazil)
  • Ivelina Damjanova (Semmelweis University, Hungary)
  • Maria Deli (Biological Research Center, HAS, Hungary)
  • Olgica Djurković-Djaković (University of Belgrade, Serbia)
  • Jean-Dennis Docquier (University of Siena, Italy)
  • Anna Erdei (Eötvös Loránd University, Hungary)
  • Zsuzsanna Fabry (University of Washington, USA)
  • Beniam Ghebremedhin (Witten/Herdecke University, Germany)
  • Nancy Guillen (Institute Pasteur, France)
  • Georgina L. Hold (University of Aberdeen, United Kingdom)
  • Ralf Ignatius (Charité - University Medicine Berlin, Germany)
  • Zsuzsanna Izsvak (MDC-Berlin, Germany)
  • Achim Kaasch (University of Cologne, Germany)
  • Tamás Laskay (University of Lübeck, Germany)
  • Oliver Liesenfeld (Roche, USA)
  • Shreemanta Parida (Vaccine Grand Challenge Program, India)
  • Matyas Sandor (University of Wisconsin, USA)
  • Ulrich Steinhoff (University of Marburg, Germany)
  • Michal Toborek (University of Miami, USA)
  • Mary Jo Wick (University of Gothenburg, Sweden)
  • Susanne A. Wolf (MDC-Berlin, Germany)

 

Dr. Dunay, Ildiko Rita
Magdeburg, Germany
E-mail: ildikodunay@gmail.com

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2019  
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European Journal of Microbiology and Immunology
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European Journal of Microbiology and Immunology
Language English
Size A4
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2011
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4
Founder Akadémiai Kiadó
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ISSN 2062-509X (Print)
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