Institute for Information Transmission Problems of the Russian Academy of Sciences, Moscow, 127994, Russia.
Biol Direct. 2010 May 10;5:34. doi: 10.1186/1745-6150-5-34.
We demonstrate the scarcity of conserved bacterial-type promoters in plastids of Streptophyta and report widely conserved promoters only for genes psaA, psbA, psbB, psbE, rbcL. Among the reasonable explanations are: evolutionary changes of sigma subunit paralogs and phage-type RNA polymerases possibly entailing the loss of corresponding nuclear genes, de novo emergence of the promoters, their loss together with plastome genes; functional substitution of the promoter boxes by transcription activation factor binding sites.
我们证明了真核植物叶绿体中保守的细菌型启动子的稀缺性，并仅报道了 psaA、psbA、psbB、psbE、rbcL 等基因广泛保守的启动子。合理的解释包括：sigma 亚基同工酶和噬菌体型 RNA 聚合酶的进化变化可能导致相应核基因的丢失，新出现的启动子，以及它们与质体基因一起丢失；启动子盒被转录激活因子结合位点的功能取代。
