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Int. J. Mol. Sci. 2014, 15(11), 20859-20875;

RNase P RNA from the Recently Evolved Plastid of Paulinella and from Algae

Instituto de Bioquímica Vegetal y Fotosíntesis, Universidad de Sevilla and CSIC, Américo Vespucio 49, 41092 Sevilla, Spain
Author to whom correspondence should be addressed.
Received: 9 October 2014 / Revised: 28 October 2014 / Accepted: 3 November 2014 / Published: 13 November 2014
(This article belongs to the Special Issue Functions of Transfer RNAs)
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The RNase P RNA catalytic subunit (RPR) encoded in some plastids has been found to be functionally defective. The amoeba Paulinella chromatophora contains an organelle (chromatophore) that is derived from the recent endosymbiotic acquisition of a cyanobacterium, and therefore represents a model of the early steps in the acquisition of plastids. In contrast with plastid RPRs the chromatophore RPR retains functionality similar to the cyanobacterial enzyme. The chromatophore RPR sequence deviates from consensus at some positions but those changes allow optimal activity compared with mutated chromatophore RPR with the consensus sequence. We have analyzed additional RPR sequences identifiable in plastids and have found that it is present in all red algae and in several prasinophyte green algae. We have assayed in vitro a subset of the plastid RPRs not previously analyzed and confirm that these organelle RPRs lack RNase P activity in vitro. View Full-Text
Keywords: chloroplast evolution; chromatophore; cyanobacteria; RNase P; tRNA processing chloroplast evolution; chromatophore; cyanobacteria; RNase P; tRNA processing

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Bernal-Bayard, P.; Puerto-Galán, L.; Vioque, A. RNase P RNA from the Recently Evolved Plastid of Paulinella and from Algae. Int. J. Mol. Sci. 2014, 15, 20859-20875.

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