Domain-swap polymerization drives the self-assembly of the bacterial flagellar motor.
Nat Struct Mol Biol
; 23(3): 197-203, 2016 Mar.
Article
em En
| MEDLINE
| ID: mdl-26854663
Large protein complexes assemble spontaneously, yet their subunits do not prematurely form unwanted aggregates. This paradox is epitomized in the bacterial flagellar motor, a sophisticated rotary motor and sensory switch consisting of hundreds of subunits. Here we demonstrate that Escherichia coli FliG, one of the earliest-assembling flagellar motor proteins, forms ordered ring structures via domain-swap polymerization, which in other proteins has been associated with uncontrolled and deleterious protein aggregation. Solution structural data, in combination with in vivo biochemical cross-linking experiments and evolutionary covariance analysis, revealed that FliG exists predominantly as a monomer in solution but only as domain-swapped polymers in assembled flagellar motors. We propose a general structural and thermodynamic model for self-assembly, in which a structural template controls assembly and shapes polymer formation into rings.
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Base de dados:
MEDLINE
Assunto principal:
Proteínas de Bactérias
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Biogênese de Organelas
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Proteínas Motores Moleculares
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Substâncias Macromoleculares
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Escherichia coli
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Multimerização Proteica
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Flagelos
Idioma:
En
Ano de publicação:
2016
Tipo de documento:
Article