fascians叶杆菌（Rhodococcus fascians）的fas操纵子编码宿主植物有效形成叶瘿所需的新基因。
The fas operon of Rhodococcus fascians encodes new genes required for efficient fasciation of host plants.
作者信息
Crespi M, Vereecke D, Temmerman W, Van Montagu M, Desomer J
机构信息
Laboratorium voor Genetica, Universiteit Gent, Belgium.
出版信息
J Bacteriol. 1994 May;176(9):2492-501. doi: 10.1128/jb.176.9.2492-2501.1994.
Abstract
Three virulence loci (fas, att, and hyp) of Rhodococcus fascians D188 have been identified on a 200-kb conjugative linear plasmid (pFiD188). The fas locus was delimited to a 6.5-kb DNA fragment by insertion mutagenesis, single homologous disruptive recombination, and in trans complementation of different avirulent insertion mutants. The locus is arranged as a large operon containing six open reading frames whose expression is specifically induced during the interaction with host plants. One predicted protein is homologous to P-450 cytochromes from actinomycetes. The putative ferredoxin component is of a novel type containing additional domains homologous to transketolases from chemoautotrophic, photosynthetic, and methylotrophic microorganisms. Genetic analysis revealed that fas encodes, in addition to the previously identified ipt, at least two new genes that are involved in fasciation development, one of which is only required on older tobacco plants.
摘要
在200 kb的接合线性质粒（pFiD188）上已鉴定出法氏红球菌D188的三个毒力位点（fas、att和hyp）。通过插入诱变、单同源破坏重组以及不同无毒插入突变体的反式互补，将fas位点限定在一个6.5 kb的DNA片段上。该位点排列成一个大型操纵子，包含六个开放阅读框，其表达在与宿主植物相互作用期间被特异性诱导。一种预测的蛋白质与放线菌的P-450细胞色素同源。假定的铁氧化还原蛋白成分是一种新型的，含有与化学自养、光合和甲基营养微生物的转酮醇酶同源的额外结构域。遗传分析表明，fas除了先前鉴定的ipt外，还编码至少两个参与簇生发育的新基因，其中一个仅在较老的烟草植株上需要。
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