Structure of the RZZ complex and molecular basis of its interaction with Spindly.
J Cell Biol
; 216(4): 961-981, 2017 04 03.
Article
em En
| MEDLINE
| ID: mdl-28320825
ABSTRACT
Kinetochores are macromolecular assemblies that connect chromosomes to spindle microtubules (MTs) during mitosis. The metazoan-specific ≈800-kD ROD-Zwilch-ZW10 (RZZ) complex builds a fibrous corona that assembles on mitotic kinetochores before MT attachment to promote chromosome alignment and robust spindle assembly checkpoint signaling. In this study, we combine biochemical reconstitutions, single-particle electron cryomicroscopy, cross-linking mass spectrometry, and structural modeling to build a complete model of human RZZ. We find that RZZ is structurally related to self-assembling cytosolic coat scaffolds that mediate membrane cargo trafficking, including Clathrin, Sec13-Sec31, and αß'ε-COP. We show that Spindly, a dynein adaptor, is related to BicD2 and binds RZZ directly in a farnesylation-dependent but membrane-independent manner. Through a targeted chemical biology approach, we identify ROD as the Spindly farnesyl receptor. Our results suggest that RZZ is dynein's cargo at human kinetochores.
Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Cinetocoros
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Proteínas Associadas aos Microtúbulos
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Fuso Acromático
Idioma:
En
Ano de publicação:
2017
Tipo de documento:
Article