SPACI score report for 1wkz in ASTRAL 2.07:

PDB Entry: 1wkz
SPACI score: 0.14
AEROSPACI score: 0.14

Experiment type: XRAY
Resolution: 3.4
R-factor: 0.257
PCK1 PROCHECK Ramachandran: 1
PCK2 PROCHECK Chi-1 angle: 2
PCK3 PROCHECK H-bonds: 2
WCK1 WHAT_CHECK Packing: -1.412
WCK2 WHAT_CHECK Ramachandran: -5.815
WCK3 WHAT_CHECK Chi angles: -2.788
WCK4 WHAT_CHECK Backbone: -0.198

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).