摘要
本文对玉米黑粉菌mtDNA进行了如下研究:(1)将mt DNA的Bam HⅠ和Pss Ⅰ两套酶切片段分别克隆到pBR322的相应位点上,共克隆到占其基因组总长度89.3%的序列。(2)以植物或真菌来源的线粒体基因作探针,用低严紧度DNA分子杂交法鉴定出了玉米黑粉菌线粒体中的7个基因,并对照另文发表的限制性内切酶图谱,初步得出了这些基因在mt DNA上排列分布的基因图谱。它们排列的次序为:—COB—OⅫ—S—rRNA—OⅩⅢ—L—rRNA—ATPase6—OⅪ—。(3)对已鉴定出的3个含线粒体基因的克隆质粒,用E.coli极大细胞系统作了表达研究,但没见到线粒体基因的编码产物。
This paper covers the following studies of mtDNA of Ustilago maydis. (1) By inserting the Bam HI and Pa I fragments of the mtDNA into the corresponding sites of pBR322, we cloned a unique sequence of 49.6 kb, accounting for 89.3% of the mitochondrial genome (60.7 kb). (2) With heterogenous genes from plants or fungi as probes, we identified seven genes, and mapped them onto the restriction map of the mt DNA- The genes were arranged in such an order: -UmCOB-UmOXII-S-rR NA-UmOXIIl-L-rRNA-UmATPase6-UmOXI-. (3) We tried to express the three cloned genes, UmOXII, UmOXIII, and Um-ATPase 6, in E. colt maxcel expression system, but DO specific protein was observed.
