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Ribonucleotide reductase (RNR) of Chlamydia trachomatis is a class I RNR enzyme composed of two homodimeric components, proteins R1 and R2. In class I RNR, R1 has the substrate binding site, whereas R2 has a diferric site and normally in its active form a stable tyrosyl free radical. C. trachomatis RNR is unusual, because its R2 component has a phenylalanine in the place of the radical carrier tyrosine...