Abstract
The C-terminus of protein R2 is important for the formation of the enzymatically active complex between proteins R1 and R2 of ribonucleotide reductase from Escherichia coli. Some residues in this part of R2 may also be involved in intramolecular electron transfer. We now demonstrate that 26 amino acid residues at C-terminus of protein R2 are mobile in the free protein, and can be studied by 1H NMR. Spectral assignment of narrow resonances was made by comparison of TOCSY and NOESY spectra from wild-type R2 with corresponding spectra of a mutant protein R2, lacking 30 residues at the car☐yl terminus.
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