Structural and mutational studies of the carboxylate cluster in Iron-free Ribonucleotide Reductase R2.
Andersson, M.E., Hogbom, M., Rinaldo-Matthis, A., Blodig, W., Liang, Y., Persson, B.O., Sjoberg, B.M., Su, X.D., Nordlund, P.(2004) Biochemistry 43: 7966-7972
- PubMed: 15196041 
- DOI: 10.1021/bi036088l
- Primary Citation of Related Structures:  
3DHZ - PubMed Abstract: 
The R2 protein of ribonucleotide reductase features a di-iron site deeply buried in the protein interior. The apo form of the R2 protein has an unusual clustering of carboxylate side chains at the empty metal-binding site. In a previous study, it was found that the loss of the four positive charge equivalents of the diferrous site in the apo protein appeared to be compensated for by the protonation of two histidine and two carboxylate side chains ...