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PMID:19465563

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Citation

Mana-Capelli, S, Gräf, R and Larochelle, DA (2009) Dictyostelium discoideum CenB is a bona fide centrin essential for nuclear architecture and centrosome stability. Eukaryotic Cell 8:1106-17

Abstract

Centrins are a family of proteins within the calcium-binding EF-hand superfamily. In addition to their archetypical role at the microtubule organizing center (MTOC), centrins have acquired multiple functionalities throughout the course of evolution. For example, centrins have been linked to different nuclear activities, including mRNA export and DNA repair. Dictyostelium discoideum centrin B is a divergent member of the centrin family. At the amino acid level, DdCenB shows 51% identity with its closest relative and only paralog, DdCenA. Phylogenetic analysis revealed that DdCenB and DdCenA form a well-supported monophyletic and divergent group within the centrin family of proteins. Interestingly, fluorescently tagged versions of DdCenB were not found at the centrosome (in whole cells or in isolated centrosomes). Instead, DdCenB localized to the nuclei of interphase cells. This localization disappeared as the cells entered mitosis, although Dictyostelium cells undergo a closed mitosis in which the nuclear envelope (NE) does not break down. DdCenB knockout cells exhibited aberrant nuclear architecture, characterized by enlarged and deformed nuclei and loss of proper centrosome-nucleus anchoring (observed as NE protrusions). At the centrosome, loss of DdCenB resulted in defects in the organization and morphology of the MTOC and supernumerary centrosomes and centrosome-related bodies. The multiple defects that the loss of DdCenB generated at the centrosome can be explained by its atypical division cycle, transitioning into the NE as it divides at mitosis. On the basis of these findings, we propose that DdCenB is required at interphase to maintain proper nuclear architecture, and before delocalizing from the nucleus, DdCenB is part of the centrosome duplication machinery.

Links

PubMed PMC2725550 Online version:10.1128/EC.00025-09

Keywords

Amino Acid Sequence; Animals; Calcium-Binding Proteins/chemistry; Calcium-Binding Proteins/genetics; Calcium-Binding Proteins/metabolism; Cell Nucleus/chemistry; Cell Nucleus/genetics; Cell Nucleus/metabolism; Centrosome/chemistry; Centrosome/metabolism; Dictyostelium/chemistry; Dictyostelium/classification; Dictyostelium/genetics; Dictyostelium/metabolism; Molecular Sequence Data; Phylogeny; Protozoan Proteins/chemistry; Protozoan Proteins/genetics; Protozoan Proteins/metabolism; Sequence Homology, Amino Acid

Significance

Annotations

Gene product Qualifier GO Term Evidence Code with/from Aspect Extension Notes Status

DICDI:CETNB

acts_upstream_of_or_within

GO:0000281: mitotic cytokinesis

ECO:0000315: mutant phenotype evidence used in manual assertion

P

Seeded From UniProt

complete

DICDI:CETNB

located_in

GO:0005634: nucleus

ECO:0000314: direct assay evidence used in manual assertion

C

Seeded From UniProt

complete

DICDI:CETNB

acts_upstream_of_or_within

GO:0010824: regulation of centrosome duplication

ECO:0000315: mutant phenotype evidence used in manual assertion

P

Seeded From UniProt

complete

DICDI:CETNB

acts_upstream_of_or_within

GO:0007098: centrosome cycle

ECO:0000315: mutant phenotype evidence used in manual assertion

P

Seeded From UniProt

complete

DICDI:CETNB

acts_upstream_of_or_within

GO:0007020: microtubule nucleation

ECO:0000315: mutant phenotype evidence used in manual assertion

P

Seeded From UniProt

complete

DICDI:CETNB

acts_upstream_of_or_within

GO:0006998: nuclear envelope organization

ECO:0000315: mutant phenotype evidence used in manual assertion

P

Seeded From UniProt

complete

DICDI:CETNB

acts_upstream_of_or_within

GO:0006997: nucleus organization

ECO:0000315: mutant phenotype evidence used in manual assertion

P

Seeded From UniProt

complete

DICDI:CETNB

located_in

GO:0005635: nuclear envelope

ECO:0000314: direct assay evidence used in manual assertion

C

Seeded From UniProt

complete


See also

References

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