Charge Detection Mass Spectrometry Identifies Preferred Non-Icosahedral Polymorphs in the Self-Assembly of Woodchuck Hepatitis Virus Capsids
Woodchuck hepatitis virus (WHV) is prone to aberrant assembly in vitro and can form a broad distribution of oversized particles. Characterizing aberrant assembly products is challenging because they are both large and heterogeneous. In this work, charge detection mass spectrometry (CDMS) is used to...
Ausführliche Beschreibung
Gespeichert in:
| Autor*in: |
Pierson, Elizabeth E. [verfasserIn] |
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| Format: |
E-Artikel |
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| Sprache: |
Englisch |
| Erschienen: |
2016transfer abstract |
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| Umfang: |
9 |
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| Übergeordnetes Werk: |
Enthalten in: Fabrication of chitin microspheres and their multipurpose application as catalyst support and adsorbent - Wang, Yuntao ELSEVIER, 2015, JMB, Amsterdam [u.a.] |
|---|---|
| Übergeordnetes Werk: |
volume:428 ; year:2016 ; number:2 ; day:29 ; month:01 ; pages:292-300 ; extent:9 |
| Links: |
|---|
| DOI / URN: |
10.1016/j.jmb.2015.06.019 |
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ELV035629231 |
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| 520 | |a Woodchuck hepatitis virus (WHV) is prone to aberrant assembly in vitro and can form a broad distribution of oversized particles. Characterizing aberrant assembly products is challenging because they are both large and heterogeneous. In this work, charge detection mass spectrometry (CDMS) is used to measure the distribution of WHV assembly products. CDMS is a single-particle technique where the masses of individual ions are determined from simultaneous measurement of each ion's charge and m/z (mass-to-charge) ratio. Under relatively aggressive, assembly promoting conditions, roughly half of the WHV assembly products are T =4 capsids composed of exactly 120 dimers while the other half are a broad distribution of larger species that extends to beyond 210 dimers. There are prominent peaks at around 132 dimers and at 150 dimers. In part, the 150 dimer complex can be attributed to elongating a T =4 capsid along its 5-fold axis by adding a ring of hexamers. However, most of the other features cannot be explained by existing models for hexameric defects. Cryo-electron microscopy provides evidence of elongated capsids. However, image analysis reveals that many of them are not closed but have “spiral-like” morphologies. The CDMS data indicate that oversized capsids have a preference for growth by addition of 3 or 4 dimers, probably by completion of hexameric vertices. | ||
| 520 | |a Woodchuck hepatitis virus (WHV) is prone to aberrant assembly in vitro and can form a broad distribution of oversized particles. Characterizing aberrant assembly products is challenging because they are both large and heterogeneous. In this work, charge detection mass spectrometry (CDMS) is used to measure the distribution of WHV assembly products. CDMS is a single-particle technique where the masses of individual ions are determined from simultaneous measurement of each ion's charge and m/z (mass-to-charge) ratio. Under relatively aggressive, assembly promoting conditions, roughly half of the WHV assembly products are T =4 capsids composed of exactly 120 dimers while the other half are a broad distribution of larger species that extends to beyond 210 dimers. There are prominent peaks at around 132 dimers and at 150 dimers. In part, the 150 dimer complex can be attributed to elongating a T =4 capsid along its 5-fold axis by adding a ring of hexamers. However, most of the other features cannot be explained by existing models for hexameric defects. Cryo-electron microscopy provides evidence of elongated capsids. However, image analysis reveals that many of them are not closed but have “spiral-like” morphologies. The CDMS data indicate that oversized capsids have a preference for growth by addition of 3 or 4 dimers, probably by completion of hexameric vertices. | ||
| 700 | 1 | |a Keifer, David Z. |4 oth | |
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| 700 | 1 | |a Wang, Joseph C.-Y. |4 oth | |
| 700 | 1 | |a Zlotnick, Adam |4 oth | |
| 700 | 1 | |a Jarrold, Martin F. |4 oth | |
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10.1016/j.jmb.2015.06.019 doi GBVA2016023000004.pica (DE-627)ELV035629231 (ELSEVIER)S0022-2836(15)00359-9 DE-627 ger DE-627 rakwb eng 570 610 570 DE-600 610 DE-600 540 VZ 660 VZ 540 VZ BIODIV DE-30 fid 42.13 bkl Pierson, Elizabeth E. verfasserin aut Charge Detection Mass Spectrometry Identifies Preferred Non-Icosahedral Polymorphs in the Self-Assembly of Woodchuck Hepatitis Virus Capsids 2016transfer abstract 9 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier Woodchuck hepatitis virus (WHV) is prone to aberrant assembly in vitro and can form a broad distribution of oversized particles. Characterizing aberrant assembly products is challenging because they are both large and heterogeneous. In this work, charge detection mass spectrometry (CDMS) is used to measure the distribution of WHV assembly products. CDMS is a single-particle technique where the masses of individual ions are determined from simultaneous measurement of each ion's charge and m/z (mass-to-charge) ratio. Under relatively aggressive, assembly promoting conditions, roughly half of the WHV assembly products are T =4 capsids composed of exactly 120 dimers while the other half are a broad distribution of larger species that extends to beyond 210 dimers. There are prominent peaks at around 132 dimers and at 150 dimers. In part, the 150 dimer complex can be attributed to elongating a T =4 capsid along its 5-fold axis by adding a ring of hexamers. However, most of the other features cannot be explained by existing models for hexameric defects. Cryo-electron microscopy provides evidence of elongated capsids. However, image analysis reveals that many of them are not closed but have “spiral-like” morphologies. The CDMS data indicate that oversized capsids have a preference for growth by addition of 3 or 4 dimers, probably by completion of hexameric vertices. Woodchuck hepatitis virus (WHV) is prone to aberrant assembly in vitro and can form a broad distribution of oversized particles. Characterizing aberrant assembly products is challenging because they are both large and heterogeneous. In this work, charge detection mass spectrometry (CDMS) is used to measure the distribution of WHV assembly products. CDMS is a single-particle technique where the masses of individual ions are determined from simultaneous measurement of each ion's charge and m/z (mass-to-charge) ratio. Under relatively aggressive, assembly promoting conditions, roughly half of the WHV assembly products are T =4 capsids composed of exactly 120 dimers while the other half are a broad distribution of larger species that extends to beyond 210 dimers. There are prominent peaks at around 132 dimers and at 150 dimers. In part, the 150 dimer complex can be attributed to elongating a T =4 capsid along its 5-fold axis by adding a ring of hexamers. However, most of the other features cannot be explained by existing models for hexameric defects. Cryo-electron microscopy provides evidence of elongated capsids. However, image analysis reveals that many of them are not closed but have “spiral-like” morphologies. The CDMS data indicate that oversized capsids have a preference for growth by addition of 3 or 4 dimers, probably by completion of hexameric vertices. Keifer, David Z. oth Kukreja, Alexander A. oth Wang, Joseph C.-Y. oth Zlotnick, Adam oth Jarrold, Martin F. oth Enthalten in Elsevier Wang, Yuntao ELSEVIER Fabrication of chitin microspheres and their multipurpose application as catalyst support and adsorbent 2015 JMB Amsterdam [u.a.] (DE-627)ELV012766127 volume:428 year:2016 number:2 day:29 month:01 pages:292-300 extent:9 https://doi.org/10.1016/j.jmb.2015.06.019 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U FID-BIODIV SSG-OLC-PHA GBV_ILN_40 42.13 Molekularbiologie VZ AR 428 2016 2 29 0129 292-300 9 045F 570 |
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10.1016/j.jmb.2015.06.019 doi GBVA2016023000004.pica (DE-627)ELV035629231 (ELSEVIER)S0022-2836(15)00359-9 DE-627 ger DE-627 rakwb eng 570 610 570 DE-600 610 DE-600 540 VZ 660 VZ 540 VZ BIODIV DE-30 fid 42.13 bkl Pierson, Elizabeth E. verfasserin aut Charge Detection Mass Spectrometry Identifies Preferred Non-Icosahedral Polymorphs in the Self-Assembly of Woodchuck Hepatitis Virus Capsids 2016transfer abstract 9 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier Woodchuck hepatitis virus (WHV) is prone to aberrant assembly in vitro and can form a broad distribution of oversized particles. Characterizing aberrant assembly products is challenging because they are both large and heterogeneous. In this work, charge detection mass spectrometry (CDMS) is used to measure the distribution of WHV assembly products. CDMS is a single-particle technique where the masses of individual ions are determined from simultaneous measurement of each ion's charge and m/z (mass-to-charge) ratio. Under relatively aggressive, assembly promoting conditions, roughly half of the WHV assembly products are T =4 capsids composed of exactly 120 dimers while the other half are a broad distribution of larger species that extends to beyond 210 dimers. There are prominent peaks at around 132 dimers and at 150 dimers. In part, the 150 dimer complex can be attributed to elongating a T =4 capsid along its 5-fold axis by adding a ring of hexamers. However, most of the other features cannot be explained by existing models for hexameric defects. Cryo-electron microscopy provides evidence of elongated capsids. However, image analysis reveals that many of them are not closed but have “spiral-like” morphologies. The CDMS data indicate that oversized capsids have a preference for growth by addition of 3 or 4 dimers, probably by completion of hexameric vertices. Woodchuck hepatitis virus (WHV) is prone to aberrant assembly in vitro and can form a broad distribution of oversized particles. Characterizing aberrant assembly products is challenging because they are both large and heterogeneous. In this work, charge detection mass spectrometry (CDMS) is used to measure the distribution of WHV assembly products. CDMS is a single-particle technique where the masses of individual ions are determined from simultaneous measurement of each ion's charge and m/z (mass-to-charge) ratio. Under relatively aggressive, assembly promoting conditions, roughly half of the WHV assembly products are T =4 capsids composed of exactly 120 dimers while the other half are a broad distribution of larger species that extends to beyond 210 dimers. There are prominent peaks at around 132 dimers and at 150 dimers. In part, the 150 dimer complex can be attributed to elongating a T =4 capsid along its 5-fold axis by adding a ring of hexamers. However, most of the other features cannot be explained by existing models for hexameric defects. Cryo-electron microscopy provides evidence of elongated capsids. However, image analysis reveals that many of them are not closed but have “spiral-like” morphologies. The CDMS data indicate that oversized capsids have a preference for growth by addition of 3 or 4 dimers, probably by completion of hexameric vertices. Keifer, David Z. oth Kukreja, Alexander A. oth Wang, Joseph C.-Y. oth Zlotnick, Adam oth Jarrold, Martin F. oth Enthalten in Elsevier Wang, Yuntao ELSEVIER Fabrication of chitin microspheres and their multipurpose application as catalyst support and adsorbent 2015 JMB Amsterdam [u.a.] (DE-627)ELV012766127 volume:428 year:2016 number:2 day:29 month:01 pages:292-300 extent:9 https://doi.org/10.1016/j.jmb.2015.06.019 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U FID-BIODIV SSG-OLC-PHA GBV_ILN_40 42.13 Molekularbiologie VZ AR 428 2016 2 29 0129 292-300 9 045F 570 |
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10.1016/j.jmb.2015.06.019 doi GBVA2016023000004.pica (DE-627)ELV035629231 (ELSEVIER)S0022-2836(15)00359-9 DE-627 ger DE-627 rakwb eng 570 610 570 DE-600 610 DE-600 540 VZ 660 VZ 540 VZ BIODIV DE-30 fid 42.13 bkl Pierson, Elizabeth E. verfasserin aut Charge Detection Mass Spectrometry Identifies Preferred Non-Icosahedral Polymorphs in the Self-Assembly of Woodchuck Hepatitis Virus Capsids 2016transfer abstract 9 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier Woodchuck hepatitis virus (WHV) is prone to aberrant assembly in vitro and can form a broad distribution of oversized particles. Characterizing aberrant assembly products is challenging because they are both large and heterogeneous. In this work, charge detection mass spectrometry (CDMS) is used to measure the distribution of WHV assembly products. CDMS is a single-particle technique where the masses of individual ions are determined from simultaneous measurement of each ion's charge and m/z (mass-to-charge) ratio. Under relatively aggressive, assembly promoting conditions, roughly half of the WHV assembly products are T =4 capsids composed of exactly 120 dimers while the other half are a broad distribution of larger species that extends to beyond 210 dimers. There are prominent peaks at around 132 dimers and at 150 dimers. In part, the 150 dimer complex can be attributed to elongating a T =4 capsid along its 5-fold axis by adding a ring of hexamers. However, most of the other features cannot be explained by existing models for hexameric defects. Cryo-electron microscopy provides evidence of elongated capsids. However, image analysis reveals that many of them are not closed but have “spiral-like” morphologies. The CDMS data indicate that oversized capsids have a preference for growth by addition of 3 or 4 dimers, probably by completion of hexameric vertices. Woodchuck hepatitis virus (WHV) is prone to aberrant assembly in vitro and can form a broad distribution of oversized particles. Characterizing aberrant assembly products is challenging because they are both large and heterogeneous. In this work, charge detection mass spectrometry (CDMS) is used to measure the distribution of WHV assembly products. CDMS is a single-particle technique where the masses of individual ions are determined from simultaneous measurement of each ion's charge and m/z (mass-to-charge) ratio. Under relatively aggressive, assembly promoting conditions, roughly half of the WHV assembly products are T =4 capsids composed of exactly 120 dimers while the other half are a broad distribution of larger species that extends to beyond 210 dimers. There are prominent peaks at around 132 dimers and at 150 dimers. In part, the 150 dimer complex can be attributed to elongating a T =4 capsid along its 5-fold axis by adding a ring of hexamers. However, most of the other features cannot be explained by existing models for hexameric defects. Cryo-electron microscopy provides evidence of elongated capsids. However, image analysis reveals that many of them are not closed but have “spiral-like” morphologies. The CDMS data indicate that oversized capsids have a preference for growth by addition of 3 or 4 dimers, probably by completion of hexameric vertices. Keifer, David Z. oth Kukreja, Alexander A. oth Wang, Joseph C.-Y. oth Zlotnick, Adam oth Jarrold, Martin F. oth Enthalten in Elsevier Wang, Yuntao ELSEVIER Fabrication of chitin microspheres and their multipurpose application as catalyst support and adsorbent 2015 JMB Amsterdam [u.a.] (DE-627)ELV012766127 volume:428 year:2016 number:2 day:29 month:01 pages:292-300 extent:9 https://doi.org/10.1016/j.jmb.2015.06.019 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U FID-BIODIV SSG-OLC-PHA GBV_ILN_40 42.13 Molekularbiologie VZ AR 428 2016 2 29 0129 292-300 9 045F 570 |
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10.1016/j.jmb.2015.06.019 doi GBVA2016023000004.pica (DE-627)ELV035629231 (ELSEVIER)S0022-2836(15)00359-9 DE-627 ger DE-627 rakwb eng 570 610 570 DE-600 610 DE-600 540 VZ 660 VZ 540 VZ BIODIV DE-30 fid 42.13 bkl Pierson, Elizabeth E. verfasserin aut Charge Detection Mass Spectrometry Identifies Preferred Non-Icosahedral Polymorphs in the Self-Assembly of Woodchuck Hepatitis Virus Capsids 2016transfer abstract 9 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier Woodchuck hepatitis virus (WHV) is prone to aberrant assembly in vitro and can form a broad distribution of oversized particles. Characterizing aberrant assembly products is challenging because they are both large and heterogeneous. In this work, charge detection mass spectrometry (CDMS) is used to measure the distribution of WHV assembly products. CDMS is a single-particle technique where the masses of individual ions are determined from simultaneous measurement of each ion's charge and m/z (mass-to-charge) ratio. Under relatively aggressive, assembly promoting conditions, roughly half of the WHV assembly products are T =4 capsids composed of exactly 120 dimers while the other half are a broad distribution of larger species that extends to beyond 210 dimers. There are prominent peaks at around 132 dimers and at 150 dimers. In part, the 150 dimer complex can be attributed to elongating a T =4 capsid along its 5-fold axis by adding a ring of hexamers. However, most of the other features cannot be explained by existing models for hexameric defects. Cryo-electron microscopy provides evidence of elongated capsids. However, image analysis reveals that many of them are not closed but have “spiral-like” morphologies. The CDMS data indicate that oversized capsids have a preference for growth by addition of 3 or 4 dimers, probably by completion of hexameric vertices. Woodchuck hepatitis virus (WHV) is prone to aberrant assembly in vitro and can form a broad distribution of oversized particles. Characterizing aberrant assembly products is challenging because they are both large and heterogeneous. In this work, charge detection mass spectrometry (CDMS) is used to measure the distribution of WHV assembly products. CDMS is a single-particle technique where the masses of individual ions are determined from simultaneous measurement of each ion's charge and m/z (mass-to-charge) ratio. Under relatively aggressive, assembly promoting conditions, roughly half of the WHV assembly products are T =4 capsids composed of exactly 120 dimers while the other half are a broad distribution of larger species that extends to beyond 210 dimers. There are prominent peaks at around 132 dimers and at 150 dimers. In part, the 150 dimer complex can be attributed to elongating a T =4 capsid along its 5-fold axis by adding a ring of hexamers. However, most of the other features cannot be explained by existing models for hexameric defects. Cryo-electron microscopy provides evidence of elongated capsids. However, image analysis reveals that many of them are not closed but have “spiral-like” morphologies. The CDMS data indicate that oversized capsids have a preference for growth by addition of 3 or 4 dimers, probably by completion of hexameric vertices. Keifer, David Z. oth Kukreja, Alexander A. oth Wang, Joseph C.-Y. oth Zlotnick, Adam oth Jarrold, Martin F. oth Enthalten in Elsevier Wang, Yuntao ELSEVIER Fabrication of chitin microspheres and their multipurpose application as catalyst support and adsorbent 2015 JMB Amsterdam [u.a.] (DE-627)ELV012766127 volume:428 year:2016 number:2 day:29 month:01 pages:292-300 extent:9 https://doi.org/10.1016/j.jmb.2015.06.019 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U FID-BIODIV SSG-OLC-PHA GBV_ILN_40 42.13 Molekularbiologie VZ AR 428 2016 2 29 0129 292-300 9 045F 570 |
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10.1016/j.jmb.2015.06.019 doi GBVA2016023000004.pica (DE-627)ELV035629231 (ELSEVIER)S0022-2836(15)00359-9 DE-627 ger DE-627 rakwb eng 570 610 570 DE-600 610 DE-600 540 VZ 660 VZ 540 VZ BIODIV DE-30 fid 42.13 bkl Pierson, Elizabeth E. verfasserin aut Charge Detection Mass Spectrometry Identifies Preferred Non-Icosahedral Polymorphs in the Self-Assembly of Woodchuck Hepatitis Virus Capsids 2016transfer abstract 9 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier Woodchuck hepatitis virus (WHV) is prone to aberrant assembly in vitro and can form a broad distribution of oversized particles. Characterizing aberrant assembly products is challenging because they are both large and heterogeneous. In this work, charge detection mass spectrometry (CDMS) is used to measure the distribution of WHV assembly products. CDMS is a single-particle technique where the masses of individual ions are determined from simultaneous measurement of each ion's charge and m/z (mass-to-charge) ratio. Under relatively aggressive, assembly promoting conditions, roughly half of the WHV assembly products are T =4 capsids composed of exactly 120 dimers while the other half are a broad distribution of larger species that extends to beyond 210 dimers. There are prominent peaks at around 132 dimers and at 150 dimers. In part, the 150 dimer complex can be attributed to elongating a T =4 capsid along its 5-fold axis by adding a ring of hexamers. However, most of the other features cannot be explained by existing models for hexameric defects. Cryo-electron microscopy provides evidence of elongated capsids. However, image analysis reveals that many of them are not closed but have “spiral-like” morphologies. The CDMS data indicate that oversized capsids have a preference for growth by addition of 3 or 4 dimers, probably by completion of hexameric vertices. Woodchuck hepatitis virus (WHV) is prone to aberrant assembly in vitro and can form a broad distribution of oversized particles. Characterizing aberrant assembly products is challenging because they are both large and heterogeneous. In this work, charge detection mass spectrometry (CDMS) is used to measure the distribution of WHV assembly products. CDMS is a single-particle technique where the masses of individual ions are determined from simultaneous measurement of each ion's charge and m/z (mass-to-charge) ratio. Under relatively aggressive, assembly promoting conditions, roughly half of the WHV assembly products are T =4 capsids composed of exactly 120 dimers while the other half are a broad distribution of larger species that extends to beyond 210 dimers. There are prominent peaks at around 132 dimers and at 150 dimers. In part, the 150 dimer complex can be attributed to elongating a T =4 capsid along its 5-fold axis by adding a ring of hexamers. However, most of the other features cannot be explained by existing models for hexameric defects. Cryo-electron microscopy provides evidence of elongated capsids. However, image analysis reveals that many of them are not closed but have “spiral-like” morphologies. The CDMS data indicate that oversized capsids have a preference for growth by addition of 3 or 4 dimers, probably by completion of hexameric vertices. Keifer, David Z. oth Kukreja, Alexander A. oth Wang, Joseph C.-Y. oth Zlotnick, Adam oth Jarrold, Martin F. oth Enthalten in Elsevier Wang, Yuntao ELSEVIER Fabrication of chitin microspheres and their multipurpose application as catalyst support and adsorbent 2015 JMB Amsterdam [u.a.] (DE-627)ELV012766127 volume:428 year:2016 number:2 day:29 month:01 pages:292-300 extent:9 https://doi.org/10.1016/j.jmb.2015.06.019 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U FID-BIODIV SSG-OLC-PHA GBV_ILN_40 42.13 Molekularbiologie VZ AR 428 2016 2 29 0129 292-300 9 045F 570 |
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Enthalten in Fabrication of chitin microspheres and their multipurpose application as catalyst support and adsorbent Amsterdam [u.a.] volume:428 year:2016 number:2 day:29 month:01 pages:292-300 extent:9 |
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Charge Detection Mass Spectrometry Identifies Preferred Non-Icosahedral Polymorphs in the Self-Assembly of Woodchuck Hepatitis Virus Capsids |
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charge detection mass spectrometry identifies preferred non-icosahedral polymorphs in the self-assembly of woodchuck hepatitis virus capsids |
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Charge Detection Mass Spectrometry Identifies Preferred Non-Icosahedral Polymorphs in the Self-Assembly of Woodchuck Hepatitis Virus Capsids |
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Woodchuck hepatitis virus (WHV) is prone to aberrant assembly in vitro and can form a broad distribution of oversized particles. Characterizing aberrant assembly products is challenging because they are both large and heterogeneous. In this work, charge detection mass spectrometry (CDMS) is used to measure the distribution of WHV assembly products. CDMS is a single-particle technique where the masses of individual ions are determined from simultaneous measurement of each ion's charge and m/z (mass-to-charge) ratio. Under relatively aggressive, assembly promoting conditions, roughly half of the WHV assembly products are T =4 capsids composed of exactly 120 dimers while the other half are a broad distribution of larger species that extends to beyond 210 dimers. There are prominent peaks at around 132 dimers and at 150 dimers. In part, the 150 dimer complex can be attributed to elongating a T =4 capsid along its 5-fold axis by adding a ring of hexamers. However, most of the other features cannot be explained by existing models for hexameric defects. Cryo-electron microscopy provides evidence of elongated capsids. However, image analysis reveals that many of them are not closed but have “spiral-like” morphologies. The CDMS data indicate that oversized capsids have a preference for growth by addition of 3 or 4 dimers, probably by completion of hexameric vertices. |
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Woodchuck hepatitis virus (WHV) is prone to aberrant assembly in vitro and can form a broad distribution of oversized particles. Characterizing aberrant assembly products is challenging because they are both large and heterogeneous. In this work, charge detection mass spectrometry (CDMS) is used to measure the distribution of WHV assembly products. CDMS is a single-particle technique where the masses of individual ions are determined from simultaneous measurement of each ion's charge and m/z (mass-to-charge) ratio. Under relatively aggressive, assembly promoting conditions, roughly half of the WHV assembly products are T =4 capsids composed of exactly 120 dimers while the other half are a broad distribution of larger species that extends to beyond 210 dimers. There are prominent peaks at around 132 dimers and at 150 dimers. In part, the 150 dimer complex can be attributed to elongating a T =4 capsid along its 5-fold axis by adding a ring of hexamers. However, most of the other features cannot be explained by existing models for hexameric defects. Cryo-electron microscopy provides evidence of elongated capsids. However, image analysis reveals that many of them are not closed but have “spiral-like” morphologies. The CDMS data indicate that oversized capsids have a preference for growth by addition of 3 or 4 dimers, probably by completion of hexameric vertices. |
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Woodchuck hepatitis virus (WHV) is prone to aberrant assembly in vitro and can form a broad distribution of oversized particles. Characterizing aberrant assembly products is challenging because they are both large and heterogeneous. In this work, charge detection mass spectrometry (CDMS) is used to measure the distribution of WHV assembly products. CDMS is a single-particle technique where the masses of individual ions are determined from simultaneous measurement of each ion's charge and m/z (mass-to-charge) ratio. Under relatively aggressive, assembly promoting conditions, roughly half of the WHV assembly products are T =4 capsids composed of exactly 120 dimers while the other half are a broad distribution of larger species that extends to beyond 210 dimers. There are prominent peaks at around 132 dimers and at 150 dimers. In part, the 150 dimer complex can be attributed to elongating a T =4 capsid along its 5-fold axis by adding a ring of hexamers. However, most of the other features cannot be explained by existing models for hexameric defects. Cryo-electron microscopy provides evidence of elongated capsids. However, image analysis reveals that many of them are not closed but have “spiral-like” morphologies. The CDMS data indicate that oversized capsids have a preference for growth by addition of 3 or 4 dimers, probably by completion of hexameric vertices. |
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Charge Detection Mass Spectrometry Identifies Preferred Non-Icosahedral Polymorphs in the Self-Assembly of Woodchuck Hepatitis Virus Capsids |
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