Folding properties of the hepatitis B core as a carrier protein for vaccination research.

Abstract:

:The hepatitis B core (HBc) protein has been used successfully in numerous experiments as a carrier for heterologous peptides. Folding and capsid formation of the chimeric proteins is not always achieved easily. In silico analyses were performed to provide further comprehension of the feasibility for predicting successful capsid formation. In contrast to previous work, we show that common in silico predictions do not ensure assembly into particles. We included new considerations regarding capsid formation of HBc fusion proteins. Not only the primary sequence and the length of the inserts seem important, also the rigidity, the distance between the N and the C-terminus and the presence of cysteines, which could form disulphide bonds, could influence proper capsid formation. Furthermore, new conformational insights were formulated when linkers were added to create extra flexibility of the chimeric particles. Different hypotheses were suggested to clarify the obtained results. To this extent, the addition of glycine-rich linkers could lower high rigidity of the insert, removal of the strain of the core protein or ease interaction between the HBc and the insert. Finally, we observed specific changes in capsid formation properties when longer linkers were used. These findings have not been reported before in this and other virus-like particle carriers. In this study, we also propose a new high-yield purification protocol for fusion proteins to be used in vaccination experiments with the carrier protein or in comparative studies of particulate or non-particulate HBc fusion proteins.

journal_name

Amino Acids

journal_title

Amino acids

authors

Janssens ME,Geysen D,Broos K,De Goeyse I,Robbens J,Van Petegem F,Timmermans JP,Guisez Y

doi

10.1007/s00726-009-0365-1

subject

Has Abstract

pub_date

2010-05-01 00:00:00

pages

1617-26

issue

5

eissn

0939-4451

issn

1438-2199

journal_volume

38

pub_type

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