SPACI score report for 1rkr in ASTRAL 2.08:

PDB Entry: 1rkr
SPACI score: 0.35
AEROSPACI score: 0.35

Experiment type: XRAY
Resolution: 2.45
R-factor: 0.173
PCK1 PROCHECK Ramachandran: 1
PCK2 PROCHECK Chi-1 angle: 2
PCK3 PROCHECK H-bonds: 2
WCK1 WHAT_CHECK Packing: 0.438
WCK2 WHAT_CHECK Ramachandran: -1.279
WCK3 WHAT_CHECK Chi angles: -3.781
WCK4 WHAT_CHECK Backbone: 0.234

Note: Here are links to pages about PROCHECK and WHAT_CHECK.

Here is the full WHAT_CHECK report on this protein (linked from the WHAT_CHECK site).