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Towards understanding the extreme radiation resistance of Ustilago maydis

机译：认识乌头草的极高抗辐射性

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摘要

Ustilago maydis is a phytopathogenic fungus exhibiting extreme resistance to UV and ionizing radiation. The molecular mechanisms underlying this resistance are as yet unknown. The recently determined genome sequence was examined for clues to the radiation resistance, focusing on proteins in homologous recombination, but there was little that was unusual about them. Furthermore, by comparison, its recombinational repair system seems to be only minimally related to the extended synthesis-dependent DNA strand-annealing system of Deinococcus radiodurans. Thus, consideration should be given to the possibility that incremental structural changes in repair proteins or their elevated expression are the basis for the extreme radiation resistance in U. maydis. Evolution of a system enabling the survival of U. maydis under such conditions could be a secondary consequence of adaptation to an environment of continual genotoxic stress encountered in its habitat.
机译：稻草乌贼（Ustilago maydis）是一种植物病原真菌，对紫外线和电离辐射表现出极大的抵抗力。尚不知道这种抗性的分子机制。检查了最近确定的基因组序列是否有抗辐射的线索，重点是同源重组中的蛋白质，但是几乎没有异常之处。此外，通过比较，它的重组修复系统似乎与放射性杜鹃球菌的扩展的依赖于合成的DNA链退火系统关系很小。因此，应考虑修复蛋白中递增的结构变化或它们的升高表达是U. maydis极高抗辐射性的基础的可能性。在这样的条件下能够使美人鱼生存的系统的进化可能是适应其栖息地遇到的持续遗传毒性环境的次要结果。

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