An evolutionarily conserved leucine-rich repeat protein CLERC is a centrosomal protein required for spindle pole integrity

Yoshinori Muto, Takashi Yoshioka, Masashi Kimura, Miki Matsunami, Hideyuki Saya, Yukio Okano

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

The centrosome functions as the microtubule-organizing center (MTOC) and plays a vital role in organizing spindle poles during mitosis. The pair of centrioles, which are the core components of the centrosome, duplicate once per cell cycle, and this feature is essential for the establishment of spindle bipolarity. Here we describe the molecular characterization of a novel protein called CLERC (Centrosomal leucine-rich repeat and coiled-coil containing protein) which is a human ortholog of Chlamydomonas Vfl1 protein. CLERC is a protein of 1032 amino acids with a calculated molecular mass of 120 kDa and possesses leucine-rich repeat and coiled-coil domains. Database searches revealed that CLERC has homologs in a wide variety of eukaryotes and is evolutionarily conserved. Endogenous CLERC protein associated with the centrosomes throughout the cell cycle and accumulated during mitosis. RNAi-mediated depletion of CLERC blocked formation of normal mitotic spindles and led to multipolar spindles. Moreover, many of the spindle poles in CLERC depleted cells contained only one centriole, indicating that centrosomes split into fractions containing a single centriole. These data indicate that the major function of CLERC during mitosis is to maintain the structural integrity of centrosomes, thereby contributing to spindle bipolarity.

Original languageEnglish
Pages (from-to)2738-2748
Number of pages11
JournalCell Cycle
Volume7
Issue number17
Publication statusPublished - 2008 Sep 1

Fingerprint

Spindle Poles
Centrosome
Poles
Centrioles
Mitosis
Proteins
Leucine
Cell Cycle
Cells
Microtubule-Organizing Center
Chlamydomonas
Spindle Apparatus
Molecular mass
Structural integrity
RNA Interference
Eukaryota
leucine-rich repeat proteins
Databases
Amino Acids

Keywords

  • Centriole
  • Centrosome
  • Chlamydomonas
  • CLERC
  • Coiled-coil
  • Leucine-rich repeat
  • Spindle pole

ASJC Scopus subject areas

  • Cell Biology
  • Biochemistry
  • Molecular Biology

Cite this

An evolutionarily conserved leucine-rich repeat protein CLERC is a centrosomal protein required for spindle pole integrity. / Muto, Yoshinori; Yoshioka, Takashi; Kimura, Masashi; Matsunami, Miki; Saya, Hideyuki; Okano, Yukio.

In: Cell Cycle, Vol. 7, No. 17, 01.09.2008, p. 2738-2748.

Research output: Contribution to journalArticle

Muto, Y, Yoshioka, T, Kimura, M, Matsunami, M, Saya, H & Okano, Y 2008, 'An evolutionarily conserved leucine-rich repeat protein CLERC is a centrosomal protein required for spindle pole integrity', Cell Cycle, vol. 7, no. 17, pp. 2738-2748.
Muto, Yoshinori ; Yoshioka, Takashi ; Kimura, Masashi ; Matsunami, Miki ; Saya, Hideyuki ; Okano, Yukio. / An evolutionarily conserved leucine-rich repeat protein CLERC is a centrosomal protein required for spindle pole integrity. In: Cell Cycle. 2008 ; Vol. 7, No. 17. pp. 2738-2748.
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