Visualization of a 4-helix bundle in the hepatitis B virus capsid by cryo-electron microscopy
Despite the development of vaccines, the hepatitis B virus remains a major cause of human liver disease. The virion consists of a lipoprotein envelope surrounding an icosahedral capsid composed of dimers of a 183-residue protein, 'core antigen' (HBcAg). Knowledge of its structure is import...
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| Veröffentlicht in: | Nature (London) 1997-03, Vol.386 (6620), p.91-94 |
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| creator | Conway, J. F Cheng, N Zlotnick, A Wingfield, P. T Stahl, S. J Steven, A. C |
| description | Despite the development of vaccines, the hepatitis B virus remains a major cause of human liver disease. The virion consists of a lipoprotein envelope surrounding an icosahedral capsid composed of dimers of a 183-residue protein, 'core antigen' (HBcAg). Knowledge of its structure is important for the design of antiviral drugs, but it has yet to be determined. Residues 150-183 are known to form a protamine-like domain required for packaging RNA, and residues 1-149 form the 'assembly domain' that polymerizes into capsids and, unusually for a capsid protein, is highly alpha-helical. Density maps calculated from cryo-electron micrographs show that the assembly domain dimer is T-shaped: its stem constitutes the dimer interface and the tips of its arms make the polymerization contacts. By refining the procedures used to calculate the map, we have extended the resolution to 9 A, revealing major elements of secondary structure. In particular, the stem, which protrudes as a spike on the capsid's outer surface, is a 4-helix bundle, formed by the pairing of alpha-helical hairpins from both subunits. |
| doi_str_mv | 10.1038/386091a0 |
| format | Article |
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F ; Cheng, N ; Zlotnick, A ; Wingfield, P. T ; Stahl, S. J ; Steven, A. C</creator><creatorcontrib>Conway, J. F ; Cheng, N ; Zlotnick, A ; Wingfield, P. T ; Stahl, S. J ; Steven, A. C</creatorcontrib><description>Despite the development of vaccines, the hepatitis B virus remains a major cause of human liver disease. The virion consists of a lipoprotein envelope surrounding an icosahedral capsid composed of dimers of a 183-residue protein, 'core antigen' (HBcAg). Knowledge of its structure is important for the design of antiviral drugs, but it has yet to be determined. Residues 150-183 are known to form a protamine-like domain required for packaging RNA, and residues 1-149 form the 'assembly domain' that polymerizes into capsids and, unusually for a capsid protein, is highly alpha-helical. Density maps calculated from cryo-electron micrographs show that the assembly domain dimer is T-shaped: its stem constitutes the dimer interface and the tips of its arms make the polymerization contacts. By refining the procedures used to calculate the map, we have extended the resolution to 9 A, revealing major elements of secondary structure. 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Psychology ; Hepatitis ; Hepatitis B ; Hepatitis B Core Antigens - chemistry ; Hepatitis B Core Antigens - ultrastructure ; hepatitis B virus ; Image Processing, Computer-Assisted ; Microbiology ; Microscopy, Electron - methods ; Models, Molecular ; Molecular biology ; Morphology, structure, chemical composition, physicochemical properties ; Protein Conformation ; Protein Structure, Secondary ; Proteins ; Recombinant Proteins - chemistry ; Recombinant Proteins - ultrastructure ; Virology ; Viruses</subject><ispartof>Nature (London), 1997-03, Vol.386 (6620), p.91-94</ispartof><rights>1997 INIST-CNRS</rights><rights>Copyright Macmillan Journals Ltd. 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Psychology</subject><subject>Hepatitis</subject><subject>Hepatitis B</subject><subject>Hepatitis B Core Antigens - chemistry</subject><subject>Hepatitis B Core Antigens - ultrastructure</subject><subject>hepatitis B virus</subject><subject>Image Processing, Computer-Assisted</subject><subject>Microbiology</subject><subject>Microscopy, Electron - methods</subject><subject>Models, Molecular</subject><subject>Molecular biology</subject><subject>Morphology, structure, chemical composition, physicochemical properties</subject><subject>Protein Conformation</subject><subject>Protein Structure, Secondary</subject><subject>Proteins</subject><subject>Recombinant Proteins - chemistry</subject><subject>Recombinant Proteins - ultrastructure</subject><subject>Virology</subject><subject>Viruses</subject><issn>0028-0836</issn><issn>1476-4687</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>1997</creationdate><recordtype>article</recordtype><sourceid>EIF</sourceid><sourceid>8G5</sourceid><sourceid>ABUWG</sourceid><sourceid>AFKRA</sourceid><sourceid>AZQEC</sourceid><sourceid>BEC</sourceid><sourceid>BENPR</sourceid><sourceid>CCPQU</sourceid><sourceid>DWQXO</sourceid><sourceid>GNUQQ</sourceid><sourceid>GUQSH</sourceid><sourceid>M2O</sourceid><recordid>eNqFkU1v1DAQhi3UqiylUv9AkYUq4BI6_h4faUVppZW4ADcUOY6jdZVNgp0gtr-erHbZQw_0NIf30TOaeQk5Z_CRgcArgRosc_CCLJg0upAazRFZAHAsAIV-SV7l_AAAihl5Qk4sKG7QLMjPHzFPro2Pbox9R_uGOiqLVWjjH1pNXd0GGjs6rgJdhWFmxpjpNf0d05Spd0OONa021KdNX4Q2-DHNknX0qc--HzavyXHj2hzO9vOUfL_9_O3mrlh-_XJ_82lZeIl6LBpTMzQYAJFXDj0Kr6paWS-cRmY51sYih-CYrsBXAivua64aAG8QjBen5N3OO6T-1xTyWK5j9qFtXRf6KZcGUQml7Ay-_z8ohTFopX5WyRQKacxW-fYJ-NBPqZvPLTlIqRkYMUMfdtD2MzmFphxSXLu0KRmU2wbLfw3O6MXeN1XrUB_AfWVzfrnPXfaubZLrfMwHjCsLYLeaNzusc-OUwiE_7PkLcyqqrQ</recordid><startdate>19970306</startdate><enddate>19970306</enddate><creator>Conway, J. 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| subjects | Biological and medical sciences Capsid - chemistry Capsid - ultrastructure Dimerization Electron microscopy Escherichia coli Freezing Fundamental and applied biological sciences. Psychology Hepatitis Hepatitis B Hepatitis B Core Antigens - chemistry Hepatitis B Core Antigens - ultrastructure hepatitis B virus Image Processing, Computer-Assisted Microbiology Microscopy, Electron - methods Models, Molecular Molecular biology Morphology, structure, chemical composition, physicochemical properties Protein Conformation Protein Structure, Secondary Proteins Recombinant Proteins - chemistry Recombinant Proteins - ultrastructure Virology Viruses |
| title | Visualization of a 4-helix bundle in the hepatitis B virus capsid by cryo-electron microscopy |
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