3R1R: R1 subunit Ribonucleotide Reductase

4R1R: R1 subunit Ribonucleotide Reductase

1RIB: R2 subunit Ribonucleotide Reductase

1AV8: Ribonucleotide Reductase

The structure to the right is of the R2 subunit of E. coli Ribonucleotide Reductase.  The biological molecule consists of a heterotetramer of 2 a- and

two b- chains.

In the structure to the right, identify the following properties:

• 8 long a-helices in one unit of R2

• Tyr122 residue

• The binuclear Fe (III) complex

• The ligands of the Fe (III) complex