Atopological Model for Hepatitis B Surface Antigen
作者:
H.J. Stirk,
J.M. Thornton,
C.R. Howard,
期刊:
Intervirology
(Karger Available online 1992)
卷期:
Volume 33,
issue 3
页码: 148-158
ISSN:0300-5526
年代: 1992
DOI:10.1159/000150244
出版商: S. Karger AG
关键词: Viral hepatitis;Hepatitis B surface antigen;Protein topology
数据来源: Karger
摘要:
A model of hepatitis B surface antigen has been derived, based on extensive sequence analysis and biochemical data. The surface antigen sequences of the human, woodchuck, ground squirrel and duck hepadnaviruses were examined using hydrophobicity, hydrophobic moments, flexibility and secondary structure prediction. The helix phase diagram, which is a modified version of Eisenberg’s hydrophobic moment plots and which specifically addresses the problem of transmembrane helices, was used to examine the predicted helices. In this model four transmembrane helices are predicted. The N and C termini and the second hydrophilic region, which bears the major B-cell antigenic determinants, are external. It is suggested that the transmembrane helices may pack to form a channel through the membrane and may also be involved in the mechanisms of cell entry. A significant difference between the duck hepadnavirus and the mammalian HBsAg sequences was found, hence care must be taken when extrapolating data between the duck and the human surface antige
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