The rbcL gene from the non-photosynthetic parasite Lathraea clandestina is not transcribed by a plastid-encoded RNA polymerase.
In the plastome of the obligate root-parasitic plant, Lathraea clandestina, the rbcL gene has been maintained and is expressed, despite the reduced size and gene content of the plastid genome. Some of the plastid genes involved in translation (e. g. transfer RNAs, ribosomal RNAs and ribosomal proteins) have been sequenced and still appear to code for functional ribosomal components. Indeed, the 16S rRNA and rpl20 genes are expressed whilst other necessary tRNA and ribosomal protein-encoding genes have probably been deleted or truncated. Although obtained by PCR, the four rpo genes for Escherichia coli-like plastid encoded RNA polymerase appear to be pseudogenes. Nevertheless, the rbcL gene, with a "-10, -35" prokaryotic-like promoter, is still transcribed. In contrast to photosynthetic plants, rbcL transcripts in Lathraea are larger in their 5' region and cover the prokaryotic-like promoter. The transcription initiation site is located near the ATG start codon of the atpB pseudogene. Similarity to non-consensus E. coli-like plastid promoters suggests that rbcL transcription is driven by a nuclear-encoded RNA polymerase.
Lusson
N A
NA
Groupe de Physiologie et Pathologie Végétales, Université de Nantes, 2 rue de la Houssinière, BP 92208, F-44322 Nantes cedex 3, France.
Delavault
P M
PM
Thalouarn
P A
PA
D003001:Cloning, Molecular; D012321:DNA-Directed RNA Polymerases / Q000502:physiology*; D018506:Gene Expression Regulation, Plant / Q000235:genetics; D017343:Genes, Plant / Q000235:genetics*; D010940:Plant Proteins / Q000235:genetics*; D010944:Plants / Q000201:enzymology / Q000469:parasitology; D018087:Plastids / Q000235:genetics*; D014176:Protein Biosynthesis / Q000235:genetics; D011544:Pseudogenes / Q000235:genetics; D012336:RNA, Ribosomal, 16S / Q000235:genetics; D012270:Ribosomes / Q000235:genetics; D012273:Ribulose-Bisphosphate Carboxylase; D016415:Sequence Alignment; D017422:Sequence Analysis, DNA; D014158:Transcription, Genetic / Q000235:genetics
D010940:Plant Proteins; D012336:RNA, Ribosomal, 16S; D012321:DNA-Directed RNA Polymerases; C101625:RbcL protein, plastid; D012273:Ribulose-Bisphosphate Carboxylase