Ckb and Ybx2 interact with Ribc2 and are necessary for the ciliary beating of multi-cilia

Kwon Keun Yeong; Jeong Hyeongsun; Jang Dong Gil; Kwon Taejoon; Park Tae Joo

doi:10.1007/s13258-022-01350-w

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저자정보: Kwon Keun Yeong (Ulsan National Institute of Science and Technology) Jeong Hyeongsun (Ulsan National Institute of Science and Technology) Jang Dong Gil (Ulsan National Institute of Science and Technology) Kwon Taejoon (Ulsan National Institute of Science and Technology) Park Tae Joo (Ulsan National Institute of Science and Technology)

저널정보: 한국유전학회 Genes & Genomics Genes & Genomics Vol.45 No.2

발행연도: 2023.2

수록면: 157 - 167 (11page)

DOI: 10.1007/s13258-022-01350-w

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Background Motile cilia in a vertebrate are important to sustaining activities of life. Fluid flow on the apical surface of several tissues, including bronchial epithelium, ependymal epithelium, and fallopian tubules is generated by the ciliary beating of motile cilia. Multi-ciliated cells in ependymal tissue are responsible for the circulation of cerebrospinal fluid (CSF), which is essential for the development and homeostasis of the central nervous system, and airway tissues are protected from external contaminants by cilia-driven mucosal flow over the top of the airway epithelium. Objective A previous study reported that reduction of Ribc2 protein leads to disruption of ciliary beating in multi-ciliated cells. However, knowledge regarding the molecular function of Ribc2 is limited, thus currently available information is also limited. Therefore, we evaluated the importance of proteins involved in the interaction with Ribc2 in the process of ciliary beating. Methods Immunoprecipitation and mass spectrometry analysis was performed for the discovery of proteins involved in the interaction with Ribc2. Expression of the target gene was inhibited by injection of antisense morpholinos and measurement of the fluid flow on the embryonic epidermis of Xenopus was performed using fluorescent beads for examination of the ciliary beating of multi cilia. In addition, the flag-tagged protein was expressed by injection of mRNA and the changes in protein localization in the cilia were measured by immunostaining and western blot analysis for analysis of the molecular interaction between Ribc2 and Ribc2 binding proteins in multi-cilia. Results The IP/MS analysis identified Ckb and Ybx2 as Ribc2 binding proteins and our results showed that localization of both Ckb and Ybx2 occurs at the axoneme of multi-cilia on the embryonic epithelium of Xenopus laevis. In addition, our findings confirmed that knock-down of Ckb or Ybx2 resulted in abnormal ciliary beating and reduction of cilia-driven fluid flow on multi-cilia of Xenopus laevis. In addition, significantly decreased localization of Ckb or Ybx2 in the ciliary axoneme was observed in Ribc2-depleted multi-cilia. Conclusion Ckb and Ybx2 are involved in the interaction with Ribc2 and are necessary for the ciliary beating of multi-cilia.

Background Motile cilia in a vertebrate are important to sustaining activities of life. Fluid flow on the apical surface of several tissues, including bronchial epithelium, ependymal epithelium, and fallopian tubules is generated by the ciliary beating of motile cilia. Multi-ciliated cells in ependymal tissue are responsible for the circulation of cerebrospinal fluid (CSF), which is essential for the development and homeostasis of the central nervous system, and airway tissues are protected from external contaminants by cilia-driven mucosal flow over the top of the airway epithelium. Objective A previous study reported that reduction of Ribc2 protein leads to disruption of ciliary beating in multi-ciliated cells. However, knowledge regarding the molecular function of Ribc2 is limited, thus currently available information is also limited. Therefore, we evaluated the importance of proteins involved in the interaction with Ribc2 in the process of ciliary beating. Methods Immunoprecipitation and mass spectrometry analysis was performed for the discovery of proteins involved in the interaction with Ribc2. Expression of the target gene was inhibited by injection of antisense morpholinos and measurement of the fluid flow on the embryonic epidermis of Xenopus was performed using fluorescent beads for examination of the ciliary beating of multi cilia. In addition, the flag-tagged protein was expressed by injection of mRNA and the changes in protein localization in the cilia were measured by immunostaining and western blot analysis for analysis of the molecular interaction between Ribc2 and Ribc2 binding proteins in multi-cilia. Results The IP/MS analysis identified Ckb and Ybx2 as Ribc2 binding proteins and our results showed that localization of both Ckb and Ybx2 occurs at the axoneme of multi-cilia on the embryonic epithelium of Xenopus laevis. In addition, our findings confirmed that knock-down of Ckb or Ybx2 resulted in abnormal ciliary beating and reduction of cilia-driven fluid flow on multi-cilia of Xenopus laevis. In addition, significantly decreased localization of Ckb or Ybx2 in the ciliary axoneme was observed in Ribc2-depleted multi-cilia. Conclusion Ckb and Ybx2 are involved in the interaction with Ribc2 and are necessary for the ciliary beating of multi-cilia.

#Cilia · Ribc2 · Ckb · Ybx2 · Ciliary beating

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Kwon Keun Yeong

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Jeong Hyeongsun

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Jang Dong Gil

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주요연구분야 자연과학 > 생물학

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Kwon Taejoon

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주요연구분야 자연과학 > 생물학

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Park Tae Joo

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주요연구분야 자연과학 > 생물학 자연과학 > 화학

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