The ribosomal protein L7/L12 with the substitution of Cys 38 for the Val 3s residue was obtained and studied to test the orientation of polypeptide chains in the N-terminal region of the dimer. The results show that the L71L12 dimer has a parallel (head-to-head) orientation of subnnits and that its first 37 Nterminal residues are sufficient for dimerization.
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