Table 2. Hinge angles between the A and B domains of various wild-type RNase A structures.

Estimated standard deviations are given in parentheses.

	Hinge angles
Structure set	Range	Average
Using all Cα atoms
Our structure	93.7–96.6	95.2 (2.1)
1u1b	93.0–94.1	93.6 (0.8)
3dxg	94.4–95.8	95.1 (1.0)
Average of 29 apo structures	93.2–96.2	94.8 (0.7)
Average of 28 pyrimidine-containing structures	93.0–95.8	94.2 (0.8)
Without five highly variable regions
Our structure	95.5–98.1	96.8 (1.9)
1u1b	95.0–95.9	95.4 (0.6)
3dxg	95.7–97.4	96.6 (1.1)
Average of 29 apo structures	94.3–98.0	96.2 (0.9)
Average of 28 pyrimidine-containing structures	94.6–98.1	95.8 (0.9)