Aurora B–INCENP localization at centromeres/inner kinetochores is required for chromosome bi-orientation in budding yeast

Luis J. García-Rodríguez, Taciana Kasciukovic, Viola Denninger, Tomoyuki Tanaka (Lead / Corresponding author)

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Abstract

For proper chromosome segregation in mitosis, sister kinetochores must interact with microtubules from opposite spindle poles (chromosome bi-orientation) [1, 2]. To promote bi-orientation, Aurora B kinase disrupts aberrant kinetochore-microtubule interactions [3–6]. It has long been debated how Aurora B halts this action when bi-orientation is established and tension is applied across sister kinetochores. A popular explanation for it is that, upon bi-orientation, sister kinetochores are pulled in opposite directions, stretching the outer kinetochores [7, 8] and moving Aurora B substrates away from Aurora-B-localizing sites at centromeres (spatial separation model) [3, 5, 9]. This model predicts that Aurora B localization at centromeres is required for bi-orientation. However, this notion was challenged by the observation that Bir1 (yeast survivin), which recruits Ipl1-Sli15 (yeast Aurora B-INCENP) to centromeres, can become dispensable for bi-orientation [10]. This raised the possibility that Aurora B localization at centromeres is dispensable for bi-orientation. Alternatively, there might be a Bir1-independent mechanism for recruiting Ipl1-Sli15 to centromeres or inner kinetochores [5, 9]. Here, we show that the COMA inner kinetochore sub-complex physically interacts with Sli15, recruits Ipl1-Sli15 to the inner kinetochore, and promotes chromosome bi-orientation, independently of Bir1, in budding yeast. Moreover, using an engineered recruitment of Ipl1-Sli15 to the inner kinetochore when both Bir1 and COMA are defective, we show that localization of Ipl1-Sli15 at centromeres or inner kinetochores is required for bi-orientation. Our results give important insight into how Aurora B disrupts kinetochore-microtubule interaction in a tension-dependent manner to promote chromosome bi-orientation. García-Rodríguez et al. show that the COMA inner kinetochore sub-complex physically interacts with Sli15, recruits Ipl1-Sli15 to the inner kinetochore, and promotes chromosome bi-orientation, independently of Bir1, in budding yeast. They conclude that localization of Ipl1-Sli15 at centromeres/inner kinetochores is required for bi-orientation.

Original languageEnglish
Pages (from-to)1536-1544.e4
Number of pages13
JournalCurrent Biology
Volume29
Issue number9
Early online date18 Apr 2019
DOIs
Publication statusPublished - 6 May 2019

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Keywords

  • Aurora B
  • Bir1
  • COMA
  • INCENP
  • Ipl1
  • Mcm21
  • Sli15
  • chromosome bi-orientation
  • kinetochore
  • survivin

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