Identification of a centromeric activity in the autonomously replicating TRA region allows improvement of the host-vector system for Candida maltosa |
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Authors: | Moriya Ohkuma Keisuke Kobayashi Shinya Kawai Chel Won Hwang Akinori Ohta and Masamich Takagi |
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Institution: | (1) Laboratory of Cellular Genetics, Department of Agricultural Chemistry, The University of Tokyo, 113 Bunkyo-ku, Tokyo, Japan;(2) Present address: The Institute of Physical and Chemical Research (RIKEN), 351-01 Wako-shi, Saitama, Japan;(3) Present address: Department of Applied Bioscience, Tokyo University of Agriculture and Technology, 183 Fuchu, Tokyo, Japan;(4) Present address: Department of Environmental Engineering, Handong University, 791-940 Pohang-Kyeongbuk, Korea |
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Abstract: | A centromeric activity was identified in the previously isolated 3.8 kb DNA fragment that carries an autonomously replicating sequence (ARS) from the yeast Candida maltosa. Plasmids bearing duplicated copies of the centromeric DNA (dicentric plasmids) were physically unstable and structural rearrangements of the dicentric plasmids occurred frequently in the transformed cells. The centromeric DNA activity was dissociated from the ARS, which is 0.2 kb in size, and was delimited to a fragment at least 325 by in length. The centromeric DNA region included the consensus sequences of CDEI (centromeric DNA element I) and an AT-rich CDEII-like region of Saccharomyces cerevisiae but had no homology to the functionally critical CDEIII consensus. A plasmid bearing the whole 3.8 kb fragment was present in 1–2 copies per cell and was maintained stably even under non-selective culture conditions, while a plasmid having only the 0.2 kb ARS was unstable and accumulated to high copy numbers. The high-copy-number plasmid allowed us to overexpress a gene to a high level, which had never been attained before, under the control of both constitutive and inducible promoters in C. maltosa. |
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Keywords: | Centromere Dicentric plasmid Overexpression Candida maltosa |
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