Unraveling the complexities of plastid transcription in plants.
Two RNA polymerases, plastid-encoded PEP and nuclear-encoded NEP, serve different sets of genes in plastids but share the transcription of housekeeping genes. Thus far, three genes have been identified that encode NEP -RpoTp, RpoTmp and RpoTm. The gene products of RpoTp and RpoTm are targeted to plastids and mitochondria, respectively. However, the RpoTmp was regarded as a dual targeting polymerase, although recent evidence demonstrates that the enzyme targets exclusively to mitochondria. This experimental discrepancy has important implications and changes our present understanding of the plastid transcription machinery.
Khan
Muhammad Sarwar
MS
National Institute for Biotechnology and Genetic Engineering (NIBGE), P.O. Box 577, Jhang Road, Faisalabad 38000, Pakistan. sarwarkhan_40@hotmail.com
D012321:DNA-Directed RNA Polymerases / Q000235:genetics*; D018506:Gene Expression Regulation, Plant / Q000235:genetics*; D008957:Models, Genetic; D010940:Plant Proteins / Q000235:genetics*; D010944:Plants / Q000235:genetics*; D018087:Plastids / Q000235:genetics*; D014157:Transcription Factors / Q000235:genetics*; D014158:Transcription, Genetic / Q000235:genetics*; D015533:Transcriptional Activation / Q000235:genetics
D010940:Plant Proteins; D014157:Transcription Factors; D012321:DNA-Directed RNA Polymerases