John A.G. Briggs
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John A.G. Briggs Retrovirus structure and assembly. The structural genomics of HIV. Gag. Immature virion. Immature HIV. p17. p24. p7. p2. p1. Gag cleavage – can be inhibited. maturation. MMTV. Immature virion. HIV. 2 pathways of Retrovirus formation. Immature virion.

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John A.G. Briggs

Retrovirus structure and assembly






Gag cleavage – can be inhibited


Immature virion


2 pathways of Retrovirus formation.

Immature virion

Internal scaffold domain

Cytoplasmic retention motif


Immature virion



Core formed from ~1200 capsid proteins

Arranged in ~96Å hexagonal lattice

Immature HIV-1

In-vitro assembled

If it is made from 80A hexagons, with six proteins per hexagon then 3400 ±200 gag proteins

Scanning Transmission Electron Microscopy hexagon then 3400

Mean mass: 165 ±29MDa

3800 ± 700 gag proteins

145nm immature virion formed from ~5000 Gag proteins hexagon then 3400

Arranged in ~80 Å hexagonal lattice

Immature virion hexagon then 3400

Tighter hexagonal lattice with 8 nm unit cell.

~5000 gag proteins form a complete shell for a 145 nm virus

Mature virion

Looser hexagonal lattice with 9.6 nm unit cell.

~1200 CA proteins form the conical core, leaving a large number elsewhere

Virology hexagon then 3400

University of Heidelberg

University of Oxford

Cornell University

Hans-Georg Kraüsslich

Barbara Müller

Marko Lampe

Bärbel Glass

Marc Johnson

Volker Vogt

Quentin Sattentau

Electron Microscopy

University of Oxford

Max-Planck Institute for Biochemistry

Stephen Fuller

Kay Grünewald

Friedrich Förster

Thomas Wilk

Giulia Zanetti