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Molecular Cloning and Expression of a Pearl Oyster (Pinctada fucata) Homologue of Mammalian Putative Tumor Suppressor QM

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Abstract

The QM gene was originally identified as a putative tumor suppressor gene from a Wilms’ tumor cell line by subtractive hybridization assay. Later studies showed that the QM protein is multifunctional, involved in cell growth and differentiation, energy metabolism, respiration, and cytoskeletal function. In this report a full-length complementary DNA encoding a QM counterpart in pearl oyster (Pinctada fucata) was isolated. Phylogenetic analysis shows that oyster QM is more closely related to its insect homologues than to the mammalian homologues. Analysis of the tissue expression pattern of the oyster QM gene showed that oyster QM messenger RNA is expressed in all tissues tested, with highest levels in the digestive gland and mantle. Furthermore, we expressed the QM protein in Escherichia coli; Western blotting showed that the antibody of human QM is immunoreactive to the expressed oyster QM protein. Incubation of the oyster QM with Zn2+ resulted in the reduction of intrinsic emission fluorescence and a red-shift in the λmax emission, indicating the occurrence of Zn2+-induced conformational changes. This evidence presents a possible mechanism for the critical function of zinc ion in the interaction of QM with Jun.

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Acknowledgements

We are grateful to Dr. Xiaozhuo Chen and Dr. Yunsheng Chen from Edison Biotechnology Institute of Ohio University for their technical help. This work was financially supported by the National High Technology Research and Development Program of China (2001AA621140) and the National Natural Science Foundation of China (30170723).

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Authors and Affiliations

  1. Institute of Marine Biotechnology, Department of Biological Sciences and Biotechnology, Tsinghua University, Beijing 100084, China

    Yong Zhang, Jie Huang, Qingxiong Meng, Tiemin Jiang, Liping Xie, Zhao Wang & Rongqing Zhang

  2. Protein Science Laboratory of the Ministry of Education, Tsinghua University, Beijing 100084, China

    Liping Xie & Rongqing Zhang

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  1. Yong Zhang
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  2. Jie Huang
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  3. Qingxiong Meng
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Correspondence to Rongqing Zhang.

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Zhang, Y., Huang, J., Meng, Q. et al. Molecular Cloning and Expression of a Pearl Oyster (Pinctada fucata) Homologue of Mammalian Putative Tumor Suppressor QM . Mar. Biotechnol. 6, 8–16 (2004). https://doi.org/10.1007/s10126-002-0120-z

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