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. 1987 Nov 11;15(21):8935–8956. doi: 10.1093/nar/15.21.8935

Formation of a type I collagen RNA dimer by intermolecular base-pairing of a conserved sequence around the translation initiation site.

P Rossi 1, B de Crombrugghe 1
PMCID: PMC306414  PMID: 3684576

Abstract

A symmetrical sequence around the translation initiation site of several collagen genes is highly conserved. Deletions in this sequence increase translational efficiency of an alpha 2(I) collagen - CAT chimeric gene after DNA transfection of NIH 3T3 fibroblasts (Schmidt, Rossi and de Crombrugghe, submitted). The secondary structure, predicted by the sequence of this segment, was shown to exist in solution in 200 mM NaCl at 37 degrees C. Cell-free translation of the corresponding RNA using a reticulocyte lysate is inhibited 2 to 4-fold by preincubation with a 0.5 M NaCl extract of an NIH 3T3 ribosomal eluate. Cell-free translation of two mutant RNAs, with partial deletions of the conserved sequence, is not inhibited by such preincubation. This inhibition is not due to degradation of the RNA and requires a protein component of the ribosomal eluate, which, however, is not required after the preincubation step. Preincubation of the RNA with the ribosomal eluate from NIH 3T3 fibroblasts causes the reversible formation of an intermolecular dimer in which the conserved symmetrical sequences hybridize to each other. This results in an increase in the degree of secondary structure of the conserved segment around the translation initiation site. We speculate that translational efficiency could be modulated by influencing the equilibrium between monomer and dimer.

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