How HIV-1 Gag assembles in cells: Putting together pieces of the puzzle.
Virus Res
; 193: 89-107, 2014 Nov 26.
Article
en En
| MEDLINE
| ID: mdl-25066606
ABSTRACT
During the late stage of the viral life cycle, HIV-1 Gag assembles into a spherical immature capsid, and undergoes budding, release, and maturation. Here we review events involved in immature capsid assembly from the perspective of five different approaches used to study this process mutational analysis, structural studies, assembly of purified recombinant Gag, assembly of newly translated Gag in a cell-free system, and studies in cells using biochemical and imaging techniques. We summarize key findings obtained using each approach, point out where there is consensus, and highlight unanswered questions. Particular emphasis is placed on reconciling data suggesting that Gag assembles by two different paths, depending on the assembly environment. Specifically, in assembly systems that lack cellular proteins, high concentrations of Gag can spontaneously assemble using purified nucleic acid as a scaffold. However, in the more complex intracellular environment, barriers that limit self-assembly are present in the form of cellular proteins, organelles, host defenses, and the absence of free nucleic acid. To overcome these barriers and promote efficient immature capsid formation in an unfavorable environment, Gag appears to utilize an energy-dependent, host-catalyzed, pathway of assembly intermediates in cells. Overall, we show how data obtained using a variety of techniques has led to our current understanding of HIV assembly.
Palabras clave
Texto completo:
1
Colección:
01-internacional
Banco de datos:
MEDLINE
Asunto principal:
VIH-1
/
Ensamble de Virus
/
Productos del Gen gag del Virus de la Inmunodeficiencia Humana
Límite:
Humans
Idioma:
En
Revista:
Virus Res
Asunto de la revista:
VIROLOGIA
Año:
2014
Tipo del documento:
Article