Biophysical Reviews

, Volume 11, Issue 3, pp 303–309 | Cite as

In vitro assembly of Haemophilus influenzae adhesin transmembrane domain and studies on the electrostatic repulsion at the interface

  • Eriko AokiEmail author
  • Masamichi Ikeguchi


Haemophilus influenzae adhesin (Hia) belongs to the trimeric autotransporter family, and it mediates the adherence of these bacteria to the epithelial cells of host organisms. Hia is composed of the passenger domain, which is a virulence factor, and the translocator domain, which anchors the passenger domain into the outer membrane. The Hia transmembrane domain forms a transmembrane β-barrel of 12 β-strands, four of which are provided from each subunit. The β-barrel has a pore that is traversed by three α-helices, one of which is provided from each subunit. This domain has a unique arginine arrangement inside the β-barrel. The side chains of the arginine residues protrude from the β-strands of three subunits toward the center of the barrel and are close to each other. Mutation of this arginine residue revealed the importance of the electrostatic repulsion between the three arginines. Electrostatic repulsion is considered to prevent misfolding and/or misassembly. The arginine clusters at the interface were found in several proteins and might generally play an important role in the assembly of the oligomer.


Arginine cluster β-Barrel Outer membrane protein Trimeric autotransporter 


Compliance with ethical standards

Conflict of interest

Eriko Aoki declares that she has no conflict of interest. Masamichi Ikeguchi declares that he has no conflict of interest.

Ethical approval

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


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Copyright information

© International Union for Pure and Applied Biophysics (IUPAB) and Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Department of Bioinformatics, Soka UniversityHachiojiJapan

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