CYTOLOGIA
Online ISSN : 1348-7019
Print ISSN : 0011-4545
Regular Article
A Plant Ancestral Polo-Like Kinase Sheds Light on the Mystery of the Evolutionary Disappearance of Polo-Like Kinases in the Plant Kingdom
Erika OkamuraTakuya SakamotoTatsuki SasakiSachihiro Matsunaga
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JOURNALS OPEN ACCESS

2017 Volume 82 Issue 3 Pages 261-266

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Abstract

Polo-like kinase (PLK) is a serine/threonine kinase involved in the formation of the mitotic spindle and the maturation of centrosomes. PLKs are highly conserved in the animal and fungi kingdoms but have disappeared in land plants. Plant PLK orthologs have been found in green algae, red algae and a filamentous terrestrial alga, Klebsormidium flaccidum, which can adapt to both fresh water and land environments. Our evolutionary analyses suggest that plants evolutionally lost the PLK ortholog before the divergence of land plants. Our localization analyses of the PLK ortholog in Cyanidioschyzon merolae demonstrated that it is localized in spindle poles and on mitochondrial polar microtubules, suggesting that plant ancestral PLK functions in the formation of mitotic spindles like animal and fungus PLK orthologs.

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© 2017 The Japan Mendel Society
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