Open Access Research article

Tunicate cytostatic factor TC14-3 induces a polycomb group gene and histone modification through Ca2+ binding and protein dimerization

Kaz Kawamura1*, Kohki Takakura1, Daigo Mori1, Kohki Ikeda1, Akio Nakamura2 and Tomohiko Suzuki3

Author Affiliations

1 Laboratory of Cellular and Molecular Biotechnology, Faculty of Science, Kochi University, Kochi 780-8520, Japan

2 Department of Molecular and Cellular Pharmacology, Gunma University, School of Medicine, Maebashi, Gunma 371-8511, Japan

3 Laboratory of Biochemistry, Faculty of Science, Kochi University, Kochi 780-8520, Japan

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BMC Cell Biology 2012, 13:3  doi:10.1186/1471-2121-13-3

Published: 2 February 2012

Additional files

Additional file 1:

Expression of PmEed during asexual life span in P. misakiensis. (A)RT-PCR of Pmβ-actin (lanes 1-3) and PmEed (lanes 4-6). Lanes 1,4, Growing bud. Lanes 2,5, Juvenile (2- or 3-week-old) zooid. Lanes 3,6, Adult zooid. (B-F)In situ hybridization of PmEed. (B)Growing bud, distal tip. Bar, 50 μm. (C, D)Juvenile zooid. (C)Pharynx. Bar, 50 μm. (D)Ventral body wall. Bar, 25 μm. (E, F)Adult zooid. (E)Intestine and surrounding perivisceral epithelium. Bar, 50 μm. (F)Gonad. Bar, 50 μm. c, coelomic cell; e, epidermis; i, intestine; o, oocyte; p, pharynx.

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Additional file 2:

Semi-quantitative PCR of PmEzh2 in adult zooids (lanes 1,2) and cultured tunicate cells (lanes 3-7) treated with TC14-3s. Lanes 1,3, control (PBS). Lane 2,4, wild type TC14-3. Lane 5, TC14-3T69R. Lane 6, TC14-3E106G. Lane 7, TC14-3K113S.N114E.

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Additional file 3:

Experimental procedure for chimeric protein production. Both cDNA of TC14-2 and TC14-3 were mutated at the position Ile61 to make an unique site for Hind III (top). They were cut with Hind III to exchange the C-terminal fragments with each other (middle). After ligation, chimeric cDNAs were mutated again to change Phe61 to Ile61 before transferred to expression vectors (bottom).

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