© The Rockefeller University Press,
0021-9525/1998//1563 $5.00
The Journal of Cell Biology, Volume 141, Number 7,
, 1998 1563-1574
C-Nap1, a Novel Centrosomal Coiled-Coil Protein and Candidate Substrate of the Cell Cycle–regulated Protein Kinase Nek2
Andrew M. Fry*,
Thibault Mayor*,
Patrick Meraldi*,
York-Dieter Stierhof
,
Kayoko Tanaka*, and
Erich A. Nigg*
* Department of Molecular Biology, Sciences II, University of Geneva, CH-1211 Geneva 4, Switzerland; and
Max-Planck-Institut für Biologie, Abteilung Membranbiochemie, D-72076 Tübingen, Germany
Nek2 (for NIMA-related kinase 2) is a mammalian cell cycle–regulated kinase structurally related to the mitotic regulator NIMA of Aspergillus nidulans. In human cells, Nek2 associates with centrosomes, and overexpression of active Nek2 has drastic consequences for centrosome structure. Here, we describe the molecular characterization of a novel human centrosomal protein, C-Nap1 (for centrosomal Nek2-associated protein 1), first identified as a Nek2-interacting protein in a yeast two-hybrid screen. Antibodies raised against recombinant C-Nap1 produced strong labeling of centrosomes by immunofluorescence, and immunoelectron microscopy revealed that C-Nap1 is associated specifically with the proximal ends of both mother and daughter centrioles. On Western blots, anti–C-Nap1 antibodies recognized a large protein (>250 kD) that was highly enriched in centrosome preparations. Sequencing of overlapping cDNAs showed that C-Nap1 has a calculated molecular mass of 281 kD and comprises extended domains of predicted coiled-coil structure. Whereas C-Nap1 was concentrated at centrosomes in all interphase cells, immunoreactivity at mitotic spindle poles was strongly diminished. Finally, the COOH-terminal domain of C-Nap1 could readily be phosphorylated by Nek2 in vitro, as well as after coexpression of the two proteins in vivo. Based on these findings, we propose a model implicating both Nek2 and C-Nap1 in the regulation of centriole–centriole cohesion during the cell cycle.
Abbreviations used in this paper: CDK, cyclin-dependent kinase; C-Nap1, centrosomal Nek2-associated protein 1; IEM, immunoelectron microscopy; INMP, intranuclear matrix protein; Nek2, NIMA-related kinase 2; PCM, pericentriolar material; SPB, spindle pole body;
-TuRCs,
-tubulin– containing ring complexes.
Address all correspondence to Erich A. Nigg, Department of Molecular Biology, Sciences II, University of Geneva, 30, Quai Ernest-Ansermet, CH-1211 Geneva 4, Switzerland. Tel.: +41 22 702 6127. Fax: +41 22 702 6868. E-mail: erich.nigg{at}molbio.unige.ch

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