A TOPOLOGICAL MODEL FOR HEPATITIS-B SURFACE-ANTIGEN

被引:153
作者
STIRK, HJ
THORNTON, JM
HOWARD, CR
机构
[1] UNIV LONDON UNIV COLL,DEPT BIOCHEM & MOLEC BIOL,LONDON WC1E 6BT,ENGLAND
[2] UNIV LONDON LONDON SCH HYG & TROP MED,DEPT CLIN SCI,LONDON WC1E 7HT,ENGLAND
关键词
VIRAL HEPATITIS; HEPATITIS-B SURFACE ANTIGEN; PROTEIN TOPOLOGY;
D O I
10.1159/000150244
中图分类号
Q93 [微生物学];
学科分类号
071005 ; 100705 ;
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 antigen.
引用
收藏
页码:148 / 158
页数:11
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