CAMP (C13orf8, ZNF828) is a novel regulator of kinetochore-microtubule attachment

Go Itoh, Shin Ichiro Kanno, Kazuhiko S.K. Uchida, Shuhei Chiba, Shiro Sugino, Kana Watanabe, Kensaku Mizuno, Akira Yasui, Toru Hirota, Kozo Tanaka

Research output: Contribution to journalArticlepeer-review

25 Citations (Scopus)

Abstract

Proper attachment of microtubules to kinetochores is essential for accurate chromosome segregation. Here, we report a novel protein involved in kinetochore-microtubule attachment, chromosome alignment-maintaining phosphoprotein (CAMP) (C13orf8, ZNF828). CAMP is a zinc-finger protein containing three characteristic repeat motifs termed the WK, SPE, and FPE motifs. CAMP localizes to chromosomes and the spindle including kinetochores, and undergoes CDK1-dependent phosphorylation at multiple sites during mitosis. CAMP-depleted cells showed severe chromosome misalignment, which was associated with the poor resistance of K-fibres to the tension exerted upon establishment of sister kinetochore bi-orientation. We found that the FPE region, which is responsible for spindle and kinetochore localization, is essential for proper chromosome alignment. The C-terminal region containing the zinc-finger domains negatively regulates chromosome alignment, and phosphorylation in the FPE region counteracts this regulation. Kinetochore localization of CENP-E and CENP-F was affected by CAMP depletion, and by expressing CAMP mutants that cannot functionally rescue CAMP depletion, placing CENP-E and CENP-F as downstream effectors of CAMP. These data suggest that CAMP is required for maintaining kinetochore-microtubule attachment during bi-orientation.

Original languageEnglish
Pages (from-to)130-144
Number of pages15
JournalEMBO Journal
Volume30
Issue number1
DOIs
Publication statusPublished - 2011 Jan 5

Keywords

  • chromosome
  • kinetochore
  • metaphase
  • microtubule
  • spindle

ASJC Scopus subject areas

  • Neuroscience(all)
  • Molecular Biology
  • Biochemistry, Genetics and Molecular Biology(all)
  • Immunology and Microbiology(all)

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