Abstract
Plastid ribosomes consist of components which have generally kept a high degree of homology with their prokaryotic ancestors. All types of rRNAs (Kössel, 1991) and most of the ribosomal proteins (for review see Mache, 1991; Subramanian et al., 1991) are highly conserved. However plastid ribosomes have also plastid-specific peculiarities. One is the presence of ribosomal proteins with no eubacterial counterparts (Gantt, 1988; Thou and Mache, 1989; Johnson et al., 1990). Second, several ribosomal proteins consist of a homologous region which is extended by NH2- and COOH-terminal regions which have no eubacterial (or eukaryotic) ribosomal counterpart (Zhou et al., 1989; Smooker et al., 1990; Martin et al., 1991). In a few cases higher order structure of ribosomal components has been studied. It also reveals similarity with the prokaryotic models but with differences as well. For example, in collaboration with Ehresman’s group, we have studied the higher-order structure of the spinach chloroplast 5S rRNA by using enzymatic and chemical probes (Romby et al., 1989). A Y-shape structure has been proposed with helices II and V not far from coaxiality and with no tertiary interactions between the different domains of the RNA. Several non canonical interactions are present in the loop E region, which are responsible for its intrinsic conformation. Interestingly, for E. coli a different loop E conformation has been proposed (Zhang and Moore, 1989) which is probably due to differences in the nucleotide sequences. Thus, the plastid ribosome, considered at the structural level, has significant differences from the E. coli ribosome.
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Mache, R., Zhou, DX., Franzetti, B., Lagrange, T., Lerbs-Mache, S., Bisanz-Seyer, C. (1993). The Spinach Plastid Ribosome: Protein Properties and Aspects of Ribosome Biosynthesis. In: Nierhaus, K.H., Franceschi, F., Subramanian, A.R., Erdmann, V.A., Wittmann-Liebold, B. (eds) The Translational Apparatus. Springer, Boston, MA. https://doi.org/10.1007/978-1-4615-2407-6_53
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DOI: https://doi.org/10.1007/978-1-4615-2407-6_53
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