Rv0233 is a Mycobacterium tuberculosis ribonucleotide reductase R2 protein with a heterodinuclear manganese/iron-carboxylate cofactor located in its metal center. The Rv0233-like family may represent a structural/functional counterpart of the evolutionary ancestor of the RNRR2's (Ribonucleotide Reductase, R2/beta subunit) and the bacterial multicomponent monooxygenases. RNRR2s belong to a broad superfamily of ferritin-like diiron-carboxylate proteins. The RNR protein catalyzes the conversion of ribonucleotides to deoxyribonucleotides and is found in prokaryotes and archaea. The catalytically active form of RNR is a proposed alpha2-beta2 tetramer. The homodimeric alpha subunit (R1) contains the active site and redox active cysteines as well as the allosteric binding sites.
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