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When cells enter mitosis the microtubule (MT) network undergoes a profound rearrangement, in part due to alterations in the MT nucleating and anchoring properties of the centrosome. Ninein and the ninein-like protein (Nlp) are centrosomal proteins involved in MT organisation in interphase cells. We show that the overexpression of these two proteins induces the fragmentation of the Golgi, and causes lysosomes to disperse toward the cell periphery. The ability of Nlp and ninein to perturb the cytoplasmic distribution of these organelles depends on their ability to interact with the dynein-dynactin motor complex. Our data also indicate that dynactin is required for the targeting of Nlp and ninein to the centrosome. Furthermore, phosphorylation of Nlp by the polo-like kinase 1 (Plk1) negatively regulates its association with dynactin. These findings uncover a mechanism through which Plk1 helps to coordinate changes in MT organisation with cell cycle progression, by controlling the dynein-dynactin-dependent transport of centrosomal proteins.

Original publication

DOI

10.1242/jcs.02622

Type

Journal article

Journal

J Cell Sci

Publication Date

01/11/2005

Volume

118

Pages

5101 - 5108

Keywords

Cell Cycle Proteins, Cell Line, Centrosome, Cytoskeletal Proteins, Down-Regulation, Dynactin Complex, Dyneins, GTP-Binding Proteins, Golgi Apparatus, HeLa Cells, Humans, Lysosomes, Microtubule-Associated Proteins, Nuclear Proteins, Phosphorylation, Protein Binding, Protein Kinases, Protein Structure, Tertiary, Protein Transport, Protein-Serine-Threonine Kinases, Proto-Oncogene Proteins, Serine Endopeptidases, Transfection