Gamma-tubulin coordinates nuclear envelope assembly around chromatin

Rossello Castillo, Catalina Ana (författare): Lund University,Lunds universitet,Molekylär patologi, Malmö,Forskargrupper vid Lunds universitet,Molecular Pathology, Malmö,Lund University Research Groups,Skåne University Hospital

Lindström, Lisa (författare): Lund University,Lunds universitet,Molekylär patologi, Malmö,Forskargrupper vid Lunds universitet,Molecular Pathology, Malmö,Lund University Research Groups,Skåne University Hospital

Glindre, Johan (författare): Lund University,Lunds universitet,Molekylär patologi, Malmö,Forskargrupper vid Lunds universitet,Molecular Pathology, Malmö,Lund University Research Groups,Skåne University Hospital

Eklund, Greta (författare): Lund University,Lunds universitet,Molekylär patologi, Malmö,Forskargrupper vid Lunds universitet,Molecular Pathology, Malmö,Lund University Research Groups,Skåne University Hospital

Alvarado-Kristensson, Maria (författare): Lund University,Lunds universitet,Molekylär patologi, Malmö,Forskargrupper vid Lunds universitet,Molecular Pathology, Malmö,Lund University Research Groups,Skåne University Hospital

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Abstract Ämnesord

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The cytosolic role of γ-tubulin as a microtubule organizer has been studied thoroughly, but its nuclear function is poorly understood. Here, we show that γ-tubulin is located throughout the chromatin of demembranated Xenopus laevis sperm and, as the nucleus is formed, γ-tubulin recruits lamin B3 and nuclear membranes. Immunodepletion of γ-tubulin impairs X. laevis assembly of both the lamina and the nuclear membrane. During nuclear formation in mammalian cell lines, γ-tubulin establishes a cellular protein boundary around chromatin that coordinates nuclear assembly of the daughter nuclei. Furthermore, expression of a γ-tubulin mutant that lacks the DNA-binding domain forms chromatin-empty nuclear like structures and demonstrate that a constant interplay between the chromatin-associated and the cytosolic pools of γ-tubulin is required and, when the balance between pools is impaired, aberrant nuclei are formed. We therefore propose that the nuclear protein meshwork formed by γ-tubulin around chromatin coordinates nuclear formation in eukaryotic cells.

Av författaren/redakt...: Rossello Castill ...; Lindström, Lisa; Glindre, Johan; Eklund, Greta; Alvarado-Kristen ...

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