Streptococcus sanguinis Class Ib Ribonucleotide Reductase: HIGH ACTIVITY WITH BOTH IRON AND MANGANESE COFACTORS AND STRUCTURAL INSIGHTS.
Makhlynets, O., Boal, A.K., Rhodes, D.V., Kitten, T., Rosenzweig, A.C., Stubbe, J.(2014) J Biol Chem 289: 6259-6272
- PubMed: 24381172 
- DOI: 10.1074/jbc.M113.533554
- Primary Citation of Related Structures:  
4N82, 4N83 - PubMed Abstract: 
Streptococcus sanguinis is a causative agent of infective endocarditis. Deletion of SsaB, a manganese transporter, drastically reduces S. sanguinis virulence. Many pathogenic organisms require class Ib ribonucleotide reductase (RNR) to catalyze the conversion of nucleotides to deoxynucleotides under aerobic conditions, and recent studies demonstrate that this enzyme uses a dimanganese-tyrosyl radical (Mn(III)2-Y(•)) cofactor in vivo ...